mirrors/git
0
0
Fork 0
mirror of https://github.com/git/git.git synced 2024-11-25 19:04:18 +08:00
Code Issues Packages Projects Releases Wiki Activity
5fee4df7f4
git/builtin/apply.c
Junio C Hamano ad76feb55e Merge branch 'tr/maint-apply-non-git-patch-parsefix' 
Fix for the codepath to parse patches that add new files, generated
by programs other than Git.  THis is an old breakage in v1.7.11 and
will need to be merged down to the maintanance tracks.

* tr/maint-apply-non-git-patch-parsefix:
  apply: carefully strdup a possibly-NULL name
2013-06-26 15:08:09 -07:00

4510 lines
114 KiB
C
Raw Blame History

/*
* apply.c
*
* Copyright (C) Linus Torvalds, 2005
*
* This applies patches on top of some (arbitrary) version of the SCM.
*
*/
#include "cache.h"
#include "cache-tree.h"
#include "quote.h"
#include "blob.h"
#include "delta.h"
#include "builtin.h"
#include "string-list.h"
#include "dir.h"
#include "diff.h"
#include "parse-options.h"
#include "xdiff-interface.h"
#include "ll-merge.h"
#include "rerere.h"
/*
* --check turns on checking that the working tree matches the
* files that are being modified, but doesn't apply the patch
* --stat does just a diffstat, and doesn't actually apply
* --numstat does numeric diffstat, and doesn't actually apply
* --index-info shows the old and new index info for paths if available.
* --index updates the cache as well.
* --cached updates only the cache without ever touching the working tree.
*/
static const char *prefix;
static int prefix_length = -1;
static int newfd = -1;
static int unidiff_zero;
static int p_value = 1;
static int p_value_known;
static int check_index;
static int update_index;
static int cached;
static int diffstat;
static int numstat;
static int summary;
static int check;
static int apply = 1;
static int apply_in_reverse;
static int apply_with_reject;
static int apply_verbosely;
static int allow_overlap;
static int no_add;
static int threeway;
static const char *fake_ancestor;
static int line_termination = '\n';
static unsigned int p_context = UINT_MAX;
static const char * const apply_usage[] = {
N_("git apply [options] [<patch>...]"),
NULL
};
static enum ws_error_action {
nowarn_ws_error,
warn_on_ws_error,
die_on_ws_error,
correct_ws_error
} ws_error_action = warn_on_ws_error;
static int whitespace_error;
static int squelch_whitespace_errors = 5;
static int applied_after_fixing_ws;
static enum ws_ignore {
ignore_ws_none,
ignore_ws_change
} ws_ignore_action = ignore_ws_none;
static const char *patch_input_file;
static const char *root;
static int root_len;
static int read_stdin = 1;
static int options;
static void parse_whitespace_option(const char *option)
{
if (!option) {
ws_error_action = warn_on_ws_error;
return;
}
if (!strcmp(option, "warn")) {
ws_error_action = warn_on_ws_error;
return;
}
if (!strcmp(option, "nowarn")) {
ws_error_action = nowarn_ws_error;
return;
}
if (!strcmp(option, "error")) {
ws_error_action = die_on_ws_error;
return;
}
if (!strcmp(option, "error-all")) {
ws_error_action = die_on_ws_error;
squelch_whitespace_errors = 0;
return;
}
if (!strcmp(option, "strip") || !strcmp(option, "fix")) {
ws_error_action = correct_ws_error;
return;
}
die(_("unrecognized whitespace option '%s'"), option);
}
static void parse_ignorewhitespace_option(const char *option)
{
if (!option || !strcmp(option, "no") ||
!strcmp(option, "false") || !strcmp(option, "never") ||
!strcmp(option, "none")) {
ws_ignore_action = ignore_ws_none;
return;
}
if (!strcmp(option, "change")) {
ws_ignore_action = ignore_ws_change;
return;
}
die(_("unrecognized whitespace ignore option '%s'"), option);
}
static void set_default_whitespace_mode(const char *whitespace_option)
{
if (!whitespace_option && !apply_default_whitespace)
ws_error_action = (apply ? warn_on_ws_error : nowarn_ws_error);
}
/*
* For "diff-stat" like behaviour, we keep track of the biggest change
* we've seen, and the longest filename. That allows us to do simple
* scaling.
*/
static int max_change, max_len;
/*
* Various "current state", notably line numbers and what
* file (and how) we're patching right now.. The "is_xxxx"
* things are flags, where -1 means "don't know yet".
*/
static int linenr = 1;
/*
* This represents one "hunk" from a patch, starting with
* "@@ -oldpos,oldlines +newpos,newlines @@" marker. The
* patch text is pointed at by patch, and its byte length
* is stored in size. leading and trailing are the number
* of context lines.
*/
struct fragment {
unsigned long leading, trailing;
unsigned long oldpos, oldlines;
unsigned long newpos, newlines;
/*
* 'patch' is usually borrowed from buf in apply_patch(),
* but some codepaths store an allocated buffer.
*/
const char *patch;
unsigned free_patch:1,
rejected:1;
int size;
int linenr;
struct fragment *next;
};
/*
* When dealing with a binary patch, we reuse "leading" field
* to store the type of the binary hunk, either deflated "delta"
* or deflated "literal".
*/
#define binary_patch_method leading
#define BINARY_DELTA_DEFLATED 1
#define BINARY_LITERAL_DEFLATED 2
/*
* This represents a "patch" to a file, both metainfo changes
* such as creation/deletion, filemode and content changes represented
* as a series of fragments.
*/
struct patch {
char *new_name, *old_name, *def_name;
unsigned int old_mode, new_mode;
int is_new, is_delete; /* -1 = unknown, 0 = false, 1 = true */
int rejected;
unsigned ws_rule;
int lines_added, lines_deleted;
int score;
unsigned int is_toplevel_relative:1;
unsigned int inaccurate_eof:1;
unsigned int is_binary:1;
unsigned int is_copy:1;
unsigned int is_rename:1;
unsigned int recount:1;
unsigned int conflicted_threeway:1;
unsigned int direct_to_threeway:1;
struct fragment *fragments;
char *result;
size_t resultsize;
char old_sha1_prefix[41];
char new_sha1_prefix[41];
struct patch *next;
/* three-way fallback result */
unsigned char threeway_stage[3][20];
};
static void free_fragment_list(struct fragment *list)
{
while (list) {
struct fragment *next = list->next;
if (list->free_patch)
free((char *)list->patch);
free(list);
list = next;
}
}
static void free_patch(struct patch *patch)
{
free_fragment_list(patch->fragments);
free(patch->def_name);
free(patch->old_name);
free(patch->new_name);
free(patch->result);
free(patch);
}
static void free_patch_list(struct patch *list)
{
while (list) {
struct patch *next = list->next;
free_patch(list);
list = next;
}
}
/*
* A line in a file, len-bytes long (includes the terminating LF,
* except for an incomplete line at the end if the file ends with
* one), and its contents hashes to 'hash'.
*/
struct line {
size_t len;
unsigned hash : 24;
unsigned flag : 8;
#define LINE_COMMON 1
#define LINE_PATCHED 2
};
/*
* This represents a "file", which is an array of "lines".
*/
struct image {
char *buf;
size_t len;
size_t nr;
size_t alloc;
struct line *line_allocated;
struct line *line;
};
/*
* Records filenames that have been touched, in order to handle
* the case where more than one patches touch the same file.
*/
static struct string_list fn_table;
static uint32_t hash_line(const char *cp, size_t len)
{
size_t i;
uint32_t h;
for (i = 0, h = 0; i < len; i++) {
if (!isspace(cp[i])) {
h = h * 3 + (cp[i] & 0xff);
}
}
return h;
}
/*
* Compare lines s1 of length n1 and s2 of length n2, ignoring
* whitespace difference. Returns 1 if they match, 0 otherwise
*/
static int fuzzy_matchlines(const char *s1, size_t n1,
const char *s2, size_t n2)
{
const char *last1 = s1 + n1 - 1;
const char *last2 = s2 + n2 - 1;
int result = 0;
/* ignore line endings */
while ((*last1 == '\r') || (*last1 == '\n'))
last1--;
while ((*last2 == '\r') || (*last2 == '\n'))
last2--;
/* skip leading whitespace */
while (isspace(*s1) && (s1 <= last1))
s1++;
while (isspace(*s2) && (s2 <= last2))
s2++;
/* early return if both lines are empty */
if ((s1 > last1) && (s2 > last2))
return 1;
while (!result) {
result = *s1++ - *s2++;
/*
* Skip whitespace inside. We check for whitespace on
* both buffers because we don't want "a b" to match
* "ab"
*/
if (isspace(*s1) && isspace(*s2)) {
while (isspace(*s1) && s1 <= last1)
s1++;
while (isspace(*s2) && s2 <= last2)
s2++;
}
/*
* If we reached the end on one side only,
* lines don't match
*/
if (
((s2 > last2) && (s1 <= last1)) ||
((s1 > last1) && (s2 <= last2)))
return 0;
if ((s1 > last1) && (s2 > last2))
break;
}
return !result;
}
static void add_line_info(struct image *img, const char *bol, size_t len, unsigned flag)
{
ALLOC_GROW(img->line_allocated, img->nr + 1, img->alloc);
img->line_allocated[img->nr].len = len;
img->line_allocated[img->nr].hash = hash_line(bol, len);
img->line_allocated[img->nr].flag = flag;
img->nr++;
}
/*
* "buf" has the file contents to be patched (read from various sources).
* attach it to "image" and add line-based index to it.
* "image" now owns the "buf".
*/
static void prepare_image(struct image *image, char *buf, size_t len,
int prepare_linetable)
{
const char *cp, *ep;
memset(image, 0, sizeof(*image));
image->buf = buf;
image->len = len;
if (!prepare_linetable)
return;
ep = image->buf + image->len;
cp = image->buf;
while (cp < ep) {
const char *next;
for (next = cp; next < ep && *next != '\n'; next++)
;
if (next < ep)
next++;
add_line_info(image, cp, next - cp, 0);
cp = next;
}
image->line = image->line_allocated;
}
static void clear_image(struct image *image)
{
free(image->buf);
free(image->line_allocated);
memset(image, 0, sizeof(*image));
}
/* fmt must contain _one_ %s and no other substitution */
static void say_patch_name(FILE *output, const char *fmt, struct patch *patch)
{
struct strbuf sb = STRBUF_INIT;
if (patch->old_name && patch->new_name &&
strcmp(patch->old_name, patch->new_name)) {
quote_c_style(patch->old_name, &sb, NULL, 0);
strbuf_addstr(&sb, " => ");
quote_c_style(patch->new_name, &sb, NULL, 0);
} else {
const char *n = patch->new_name;
if (!n)
n = patch->old_name;
quote_c_style(n, &sb, NULL, 0);
}
fprintf(output, fmt, sb.buf);
fputc('\n', output);
strbuf_release(&sb);
}
#define SLOP (16)
static void read_patch_file(struct strbuf *sb, int fd)
{
if (strbuf_read(sb, fd, 0) < 0)
die_errno("git apply: failed to read");
/*
* Make sure that we have some slop in the buffer
* so that we can do speculative "memcmp" etc, and
* see to it that it is NUL-filled.
*/
strbuf_grow(sb, SLOP);
memset(sb->buf + sb->len, 0, SLOP);
}
static unsigned long linelen(const char *buffer, unsigned long size)
{
unsigned long len = 0;
while (size--) {
len++;
if (*buffer++ == '\n')
break;
}
return len;
}
static int is_dev_null(const char *str)
{
return !memcmp("/dev/null", str, 9) && isspace(str[9]);
}
#define TERM_SPACE 1
#define TERM_TAB 2
static int name_terminate(const char *name, int namelen, int c, int terminate)
{
if (c == ' ' && !(terminate & TERM_SPACE))
return 0;
if (c == '\t' && !(terminate & TERM_TAB))
return 0;
return 1;
}
/* remove double slashes to make --index work with such filenames */
static char *squash_slash(char *name)
{
int i = 0, j = 0;
if (!name)
return NULL;
while (name[i]) {
if ((name[j++] = name[i++]) == '/')
while (name[i] == '/')
i++;
}
name[j] = '\0';
return name;
}
static char *find_name_gnu(const char *line, const char *def, int p_value)
{
struct strbuf name = STRBUF_INIT;
char *cp;
/*
* Proposed "new-style" GNU patch/diff format; see
* http://marc.theaimsgroup.com/?l=git&m=112927316408690&w=2
*/
if (unquote_c_style(&name, line, NULL)) {
strbuf_release(&name);
return NULL;
}
for (cp = name.buf; p_value; p_value--) {
cp = strchr(cp, '/');
if (!cp) {
strbuf_release(&name);
return NULL;
}
cp++;
}
strbuf_remove(&name, 0, cp - name.buf);
if (root)
strbuf_insert(&name, 0, root, root_len);
return squash_slash(strbuf_detach(&name, NULL));
}
static size_t sane_tz_len(const char *line, size_t len)
{
const char *tz, *p;
if (len < strlen(" +0500") || line[len-strlen(" +0500")] != ' ')
return 0;
tz = line + len - strlen(" +0500");
if (tz[1] != '+' && tz[1] != '-')
return 0;
for (p = tz + 2; p != line + len; p++)
if (!isdigit(*p))
return 0;
return line + len - tz;
}
static size_t tz_with_colon_len(const char *line, size_t len)
{
const char *tz, *p;
if (len < strlen(" +08:00") || line[len - strlen(":00")] != ':')
return 0;
tz = line + len - strlen(" +08:00");
if (tz[0] != ' ' || (tz[1] != '+' && tz[1] != '-'))
return 0;
p = tz + 2;
if (!isdigit(*p++) || !isdigit(*p++) || *p++ != ':' ||
!isdigit(*p++) || !isdigit(*p++))
return 0;
return line + len - tz;
}
static size_t date_len(const char *line, size_t len)
{
const char *date, *p;
if (len < strlen("72-02-05") || line[len-strlen("-05")] != '-')
return 0;
p = date = line + len - strlen("72-02-05");
if (!isdigit(*p++) || !isdigit(*p++) || *p++ != '-' ||
!isdigit(*p++) || !isdigit(*p++) || *p++ != '-' ||
!isdigit(*p++) || !isdigit(*p++)) /* Not a date. */
return 0;
if (date - line >= strlen("19") &&
isdigit(date[-1]) && isdigit(date[-2])) /* 4-digit year */
date -= strlen("19");
return line + len - date;
}
static size_t short_time_len(const char *line, size_t len)
{
const char *time, *p;
if (len < strlen(" 07:01:32") || line[len-strlen(":32")] != ':')
return 0;
p = time = line + len - strlen(" 07:01:32");
/* Permit 1-digit hours? */
if (*p++ != ' ' ||
!isdigit(*p++) || !isdigit(*p++) || *p++ != ':' ||
!isdigit(*p++) || !isdigit(*p++) || *p++ != ':' ||
!isdigit(*p++) || !isdigit(*p++)) /* Not a time. */
return 0;
return line + len - time;
}
static size_t fractional_time_len(const char *line, size_t len)
{
const char *p;
size_t n;
/* Expected format: 19:41:17.620000023 */
if (!len || !isdigit(line[len - 1]))
return 0;
p = line + len - 1;
/* Fractional seconds. */
while (p > line && isdigit(*p))
p--;
if (*p != '.')
return 0;
/* Hours, minutes, and whole seconds. */
n = short_time_len(line, p - line);
if (!n)
return 0;
return line + len - p + n;
}
static size_t trailing_spaces_len(const char *line, size_t len)
{
const char *p;
/* Expected format: ' ' x (1 or more) */
if (!len || line[len - 1] != ' ')
return 0;
p = line + len;
while (p != line) {
p--;
if (*p != ' ')
return line + len - (p + 1);
}
/* All spaces! */
return len;
}
static size_t diff_timestamp_len(const char *line, size_t len)
{
const char *end = line + len;
size_t n;
/*
* Posix: 2010-07-05 19:41:17
* GNU: 2010-07-05 19:41:17.620000023 -0500
*/
if (!isdigit(end[-1]))
return 0;
n = sane_tz_len(line, end - line);
if (!n)
n = tz_with_colon_len(line, end - line);
end -= n;
n = short_time_len(line, end - line);
if (!n)
n = fractional_time_len(line, end - line);
end -= n;
n = date_len(line, end - line);
if (!n) /* No date. Too bad. */
return 0;
end -= n;
if (end == line) /* No space before date. */
return 0;
if (end[-1] == '\t') { /* Success! */
end--;
return line + len - end;
}
if (end[-1] != ' ') /* No space before date. */
return 0;
/* Whitespace damage. */
end -= trailing_spaces_len(line, end - line);
return line + len - end;
}
static char *null_strdup(const char *s)
{
return s ? xstrdup(s) : NULL;
}
static char *find_name_common(const char *line, const char *def,
int p_value, const char *end, int terminate)
{
int len;
const char *start = NULL;
if (p_value == 0)
start = line;
while (line != end) {
char c = *line;
if (!end && isspace(c)) {
if (c == '\n')
break;
if (name_terminate(start, line-start, c, terminate))
break;
}
line++;
if (c == '/' && !--p_value)
start = line;
}
if (!start)
return squash_slash(null_strdup(def));
len = line - start;
if (!len)
return squash_slash(null_strdup(def));
/*
* Generally we prefer the shorter name, especially
* if the other one is just a variation of that with
* something else tacked on to the end (ie "file.orig"
* or "file~").
*/
if (def) {
int deflen = strlen(def);
if (deflen < len && !strncmp(start, def, deflen))
return squash_slash(xstrdup(def));
}
if (root) {
char *ret = xmalloc(root_len + len + 1);
strcpy(ret, root);
memcpy(ret + root_len, start, len);
ret[root_len + len] = '\0';
return squash_slash(ret);
}
return squash_slash(xmemdupz(start, len));
}
static char *find_name(const char *line, char *def, int p_value, int terminate)
{
if (*line == '"') {
char *name = find_name_gnu(line, def, p_value);
if (name)
return name;
}
return find_name_common(line, def, p_value, NULL, terminate);
}
static char *find_name_traditional(const char *line, char *def, int p_value)
{
size_t len = strlen(line);
size_t date_len;
if (*line == '"') {
char *name = find_name_gnu(line, def, p_value);
if (name)
return name;
}
len = strchrnul(line, '\n') - line;
date_len = diff_timestamp_len(line, len);
if (!date_len)
return find_name_common(line, def, p_value, NULL, TERM_TAB);
len -= date_len;
return find_name_common(line, def, p_value, line + len, 0);
}
static int count_slashes(const char *cp)
{
int cnt = 0;
char ch;
while ((ch = *cp++))
if (ch == '/')
cnt++;
return cnt;
}
/*
* Given the string after "--- " or "+++ ", guess the appropriate
* p_value for the given patch.
*/
static int guess_p_value(const char *nameline)
{
char *name, *cp;
int val = -1;
if (is_dev_null(nameline))
return -1;
name = find_name_traditional(nameline, NULL, 0);
if (!name)
return -1;
cp = strchr(name, '/');
if (!cp)
val = 0;
else if (prefix) {
/*
* Does it begin with "a/$our-prefix" and such? Then this is
* very likely to apply to our directory.
*/
if (!strncmp(name, prefix, prefix_length))
val = count_slashes(prefix);
else {
cp++;
if (!strncmp(cp, prefix, prefix_length))
val = count_slashes(prefix) + 1;
}
}
free(name);
return val;
}
/*
* Does the ---/+++ line has the POSIX timestamp after the last HT?
* GNU diff puts epoch there to signal a creation/deletion event. Is
* this such a timestamp?
*/
static int has_epoch_timestamp(const char *nameline)
{
/*
* We are only interested in epoch timestamp; any non-zero
* fraction cannot be one, hence "(\.0+)?" in the regexp below.
* For the same reason, the date must be either 1969-12-31 or
* 1970-01-01, and the seconds part must be "00".
*/
const char stamp_regexp[] =
"^(1969-12-31|1970-01-01)"
" "
"[0-2][0-9]:[0-5][0-9]:00(\\.0+)?"
" "
"([-+][0-2][0-9]:?[0-5][0-9])\n";
const char *timestamp = NULL, *cp, *colon;
static regex_t *stamp;
regmatch_t m[10];
int zoneoffset;
int hourminute;
int status;
for (cp = nameline; *cp != '\n'; cp++) {
if (*cp == '\t')
timestamp = cp + 1;
}
if (!timestamp)
return 0;
if (!stamp) {
stamp = xmalloc(sizeof(*stamp));
if (regcomp(stamp, stamp_regexp, REG_EXTENDED)) {
warning(_("Cannot prepare timestamp regexp %s"),
stamp_regexp);
return 0;
}
}
status = regexec(stamp, timestamp, ARRAY_SIZE(m), m, 0);
if (status) {
if (status != REG_NOMATCH)
warning(_("regexec returned %d for input: %s"),
status, timestamp);
return 0;
}
zoneoffset = strtol(timestamp + m[3].rm_so + 1, (char **) &colon, 10);
if (*colon == ':')
zoneoffset = zoneoffset * 60 + strtol(colon + 1, NULL, 10);
else
zoneoffset = (zoneoffset / 100) * 60 + (zoneoffset % 100);
if (timestamp[m[3].rm_so] == '-')
zoneoffset = -zoneoffset;
/*
* YYYY-MM-DD hh:mm:ss must be from either 1969-12-31
* (west of GMT) or 1970-01-01 (east of GMT)
*/
if ((zoneoffset < 0 && memcmp(timestamp, "1969-12-31", 10)) ||
(0 <= zoneoffset && memcmp(timestamp, "1970-01-01", 10)))
return 0;
hourminute = (strtol(timestamp + 11, NULL, 10) * 60 +
strtol(timestamp + 14, NULL, 10) -
zoneoffset);
return ((zoneoffset < 0 && hourminute == 1440) ||
(0 <= zoneoffset && !hourminute));
}
/*
* Get the name etc info from the ---/+++ lines of a traditional patch header
*
* FIXME! The end-of-filename heuristics are kind of screwy. For existing
* files, we can happily check the index for a match, but for creating a
* new file we should try to match whatever "patch" does. I have no idea.
*/
static void parse_traditional_patch(const char *first, const char *second, struct patch *patch)
{
char *name;
first += 4; /* skip "--- " */
second += 4; /* skip "+++ " */
if (!p_value_known) {
int p, q;
p = guess_p_value(first);
q = guess_p_value(second);
if (p < 0) p = q;
if (0 <= p && p == q) {
p_value = p;
p_value_known = 1;
}
}
if (is_dev_null(first)) {
patch->is_new = 1;
patch->is_delete = 0;
name = find_name_traditional(second, NULL, p_value);
patch->new_name = name;
} else if (is_dev_null(second)) {
patch->is_new = 0;
patch->is_delete = 1;
name = find_name_traditional(first, NULL, p_value);
patch->old_name = name;
} else {
char *first_name;
first_name = find_name_traditional(first, NULL, p_value);
name = find_name_traditional(second, first_name, p_value);
free(first_name);
if (has_epoch_timestamp(first)) {
patch->is_new = 1;
patch->is_delete = 0;
patch->new_name = name;
} else if (has_epoch_timestamp(second)) {
patch->is_new = 0;
patch->is_delete = 1;
patch->old_name = name;
} else {
patch->old_name = name;
patch->new_name = null_strdup(name);
}
}
if (!name)
die(_("unable to find filename in patch at line %d"), linenr);
}
static int gitdiff_hdrend(const char *line, struct patch *patch)
{
return -1;
}
/*
* We're anal about diff header consistency, to make
* sure that we don't end up having strange ambiguous
* patches floating around.
*
* As a result, gitdiff_{old|new}name() will check
* their names against any previous information, just
* to make sure..
*/
#define DIFF_OLD_NAME 0
#define DIFF_NEW_NAME 1
static char *gitdiff_verify_name(const char *line, int isnull, char *orig_name, int side)
{
if (!orig_name && !isnull)
return find_name(line, NULL, p_value, TERM_TAB);
if (orig_name) {
int len;
const char *name;
char *another;
name = orig_name;
len = strlen(name);
if (isnull)
die(_("git apply: bad git-diff - expected /dev/null, got %s on line %d"), name, linenr);
another = find_name(line, NULL, p_value, TERM_TAB);
if (!another || memcmp(another, name, len + 1))
die((side == DIFF_NEW_NAME) ?
_("git apply: bad git-diff - inconsistent new filename on line %d") :
_("git apply: bad git-diff - inconsistent old filename on line %d"), linenr);
free(another);
return orig_name;
}
else {
/* expect "/dev/null" */
if (memcmp("/dev/null", line, 9) || line[9] != '\n')
die(_("git apply: bad git-diff - expected /dev/null on line %d"), linenr);
return NULL;
}
}
static int gitdiff_oldname(const char *line, struct patch *patch)
{
char *orig = patch->old_name;
patch->old_name = gitdiff_verify_name(line, patch->is_new, patch->old_name,
DIFF_OLD_NAME);
if (orig != patch->old_name)
free(orig);
return 0;
}
static int gitdiff_newname(const char *line, struct patch *patch)
{
char *orig = patch->new_name;
patch->new_name = gitdiff_verify_name(line, patch->is_delete, patch->new_name,
DIFF_NEW_NAME);
if (orig != patch->new_name)
free(orig);
return 0;
}
static int gitdiff_oldmode(const char *line, struct patch *patch)
{
patch->old_mode = strtoul(line, NULL, 8);
return 0;
}
static int gitdiff_newmode(const char *line, struct patch *patch)
{
patch->new_mode = strtoul(line, NULL, 8);
return 0;
}
static int gitdiff_delete(const char *line, struct patch *patch)
{
patch->is_delete = 1;
free(patch->old_name);
patch->old_name = null_strdup(patch->def_name);
return gitdiff_oldmode(line, patch);
}
static int gitdiff_newfile(const char *line, struct patch *patch)
{
patch->is_new = 1;
free(patch->new_name);
patch->new_name = null_strdup(patch->def_name);
return gitdiff_newmode(line, patch);
}
static int gitdiff_copysrc(const char *line, struct patch *patch)
{
patch->is_copy = 1;
free(patch->old_name);
patch->old_name = find_name(line, NULL, p_value ? p_value - 1 : 0, 0);
return 0;
}
static int gitdiff_copydst(const char *line, struct patch *patch)
{
patch->is_copy = 1;
free(patch->new_name);
patch->new_name = find_name(line, NULL, p_value ? p_value - 1 : 0, 0);
return 0;
}
static int gitdiff_renamesrc(const char *line, struct patch *patch)
{
patch->is_rename = 1;
free(patch->old_name);
patch->old_name = find_name(line, NULL, p_value ? p_value - 1 : 0, 0);
return 0;
}
static int gitdiff_renamedst(const char *line, struct patch *patch)
{
patch->is_rename = 1;
free(patch->new_name);
patch->new_name = find_name(line, NULL, p_value ? p_value - 1 : 0, 0);
return 0;
}
static int gitdiff_similarity(const char *line, struct patch *patch)
{
unsigned long val = strtoul(line, NULL, 10);
if (val <= 100)
patch->score = val;
return 0;
}
static int gitdiff_dissimilarity(const char *line, struct patch *patch)
{
unsigned long val = strtoul(line, NULL, 10);
if (val <= 100)
patch->score = val;
return 0;
}
static int gitdiff_index(const char *line, struct patch *patch)
{
/*
* index line is N hexadecimal, "..", N hexadecimal,
* and optional space with octal mode.
*/
const char *ptr, *eol;
int len;
ptr = strchr(line, '.');
if (!ptr || ptr[1] != '.' || 40 < ptr - line)
return 0;
len = ptr - line;
memcpy(patch->old_sha1_prefix, line, len);
patch->old_sha1_prefix[len] = 0;
line = ptr + 2;
ptr = strchr(line, ' ');
eol = strchr(line, '\n');
if (!ptr || eol < ptr)
ptr = eol;
len = ptr - line;
if (40 < len)
return 0;
memcpy(patch->new_sha1_prefix, line, len);
patch->new_sha1_prefix[len] = 0;
if (*ptr == ' ')
patch->old_mode = strtoul(ptr+1, NULL, 8);
return 0;
}
/*
* This is normal for a diff that doesn't change anything: we'll fall through
* into the next diff. Tell the parser to break out.
*/
static int gitdiff_unrecognized(const char *line, struct patch *patch)
{
return -1;
}
/*
* Skip p_value leading components from "line"; as we do not accept
* absolute paths, return NULL in that case.
*/
static const char *skip_tree_prefix(const char *line, int llen)
{
int nslash;
int i;
if (!p_value)
return (llen && line[0] == '/') ? NULL : line;
nslash = p_value;
for (i = 0; i < llen; i++) {
int ch = line[i];
if (ch == '/' && --nslash <= 0)
return (i == 0) ? NULL : &line[i + 1];
}
return NULL;
}
/*
* This is to extract the same name that appears on "diff --git"
* line. We do not find and return anything if it is a rename
* patch, and it is OK because we will find the name elsewhere.
* We need to reliably find name only when it is mode-change only,
* creation or deletion of an empty file. In any of these cases,
* both sides are the same name under a/ and b/ respectively.
*/
static char *git_header_name(const char *line, int llen)
{
const char *name;
const char *second = NULL;
size_t len, line_len;
line += strlen("diff --git ");
llen -= strlen("diff --git ");
if (*line == '"') {
const char *cp;
struct strbuf first = STRBUF_INIT;
struct strbuf sp = STRBUF_INIT;
if (unquote_c_style(&first, line, &second))
goto free_and_fail1;
/* strip the a/b prefix including trailing slash */
cp = skip_tree_prefix(first.buf, first.len);
if (!cp)
goto free_and_fail1;
strbuf_remove(&first, 0, cp - first.buf);
/*
* second points at one past closing dq of name.
* find the second name.
*/
while ((second < line + llen) && isspace(*second))
second++;
if (line + llen <= second)
goto free_and_fail1;
if (*second == '"') {
if (unquote_c_style(&sp, second, NULL))
goto free_and_fail1;
cp = skip_tree_prefix(sp.buf, sp.len);
if (!cp)
goto free_and_fail1;
/* They must match, otherwise ignore */
if (strcmp(cp, first.buf))
goto free_and_fail1;
strbuf_release(&sp);
return strbuf_detach(&first, NULL);
}
/* unquoted second */
cp = skip_tree_prefix(second, line + llen - second);
if (!cp)
goto free_and_fail1;
if (line + llen - cp != first.len ||
memcmp(first.buf, cp, first.len))
goto free_and_fail1;
return strbuf_detach(&first, NULL);
free_and_fail1:
strbuf_release(&first);
strbuf_release(&sp);
return NULL;
}
/* unquoted first name */
name = skip_tree_prefix(line, llen);
if (!name)
return NULL;
/*
* since the first name is unquoted, a dq if exists must be
* the beginning of the second name.
*/
for (second = name; second < line + llen; second++) {
if (*second == '"') {
struct strbuf sp = STRBUF_INIT;
const char *np;
if (unquote_c_style(&sp, second, NULL))
goto free_and_fail2;
np = skip_tree_prefix(sp.buf, sp.len);
if (!np)
goto free_and_fail2;
len = sp.buf + sp.len - np;
if (len < second - name &&
!strncmp(np, name, len) &&
isspace(name[len])) {
/* Good */
strbuf_remove(&sp, 0, np - sp.buf);
return strbuf_detach(&sp, NULL);
}
free_and_fail2:
strbuf_release(&sp);
return NULL;
}
}
/*
* Accept a name only if it shows up twice, exactly the same
* form.
*/
second = strchr(name, '\n');
if (!second)
return NULL;
line_len = second - name;
for (len = 0 ; ; len++) {
switch (name[len]) {
default:
continue;
case '\n':
return NULL;
case '\t': case ' ':
/*
* Is this the separator between the preimage
* and the postimage pathname? Again, we are
* only interested in the case where there is
* no rename, as this is only to set def_name
* and a rename patch has the names elsewhere
* in an unambiguous form.
*/
if (!name[len + 1])
return NULL; /* no postimage name */
second = skip_tree_prefix(name + len + 1,
line_len - (len + 1));
if (!second)
return NULL;
/*
* Does len bytes starting at "name" and "second"
* (that are separated by one HT or SP we just
* found) exactly match?
*/
if (second[len] == '\n' && !strncmp(name, second, len))
return xmemdupz(name, len);
}
}
}
/* Verify that we recognize the lines following a git header */
static int parse_git_header(const char *line, int len, unsigned int size, struct patch *patch)
{
unsigned long offset;
/* A git diff has explicit new/delete information, so we don't guess */
patch->is_new = 0;
patch->is_delete = 0;
/*
* Some things may not have the old name in the
* rest of the headers anywhere (pure mode changes,
* or removing or adding empty files), so we get
* the default name from the header.
*/
patch->def_name = git_header_name(line, len);
if (patch->def_name && root) {
char *s = xmalloc(root_len + strlen(patch->def_name) + 1);
strcpy(s, root);
strcpy(s + root_len, patch->def_name);
free(patch->def_name);
patch->def_name = s;
}
line += len;
size -= len;
linenr++;
for (offset = len ; size > 0 ; offset += len, size -= len, line += len, linenr++) {
static const struct opentry {
const char *str;
int (*fn)(const char *, struct patch *);
} optable[] = {
{ "@@ -", gitdiff_hdrend },
{ "--- ", gitdiff_oldname },
{ "+++ ", gitdiff_newname },
{ "old mode ", gitdiff_oldmode },
{ "new mode ", gitdiff_newmode },
{ "deleted file mode ", gitdiff_delete },
{ "new file mode ", gitdiff_newfile },
{ "copy from ", gitdiff_copysrc },
{ "copy to ", gitdiff_copydst },
{ "rename old ", gitdiff_renamesrc },
{ "rename new ", gitdiff_renamedst },
{ "rename from ", gitdiff_renamesrc },
{ "rename to ", gitdiff_renamedst },
{ "similarity index ", gitdiff_similarity },
{ "dissimilarity index ", gitdiff_dissimilarity },
{ "index ", gitdiff_index },
{ "", gitdiff_unrecognized },
};
int i;
len = linelen(line, size);
if (!len || line[len-1] != '\n')
break;
for (i = 0; i < ARRAY_SIZE(optable); i++) {
const struct opentry *p = optable + i;
int oplen = strlen(p->str);
if (len < oplen || memcmp(p->str, line, oplen))
continue;
if (p->fn(line + oplen, patch) < 0)
return offset;
break;
}
}
return offset;
}
static int parse_num(const char *line, unsigned long *p)
{
char *ptr;
if (!isdigit(*line))
return 0;
*p = strtoul(line, &ptr, 10);
return ptr - line;
}
static int parse_range(const char *line, int len, int offset, const char *expect,
unsigned long *p1, unsigned long *p2)
{
int digits, ex;
if (offset < 0 || offset >= len)
return -1;
line += offset;
len -= offset;
digits = parse_num(line, p1);
if (!digits)
return -1;
offset += digits;
line += digits;
len -= digits;
*p2 = 1;
if (*line == ',') {
digits = parse_num(line+1, p2);
if (!digits)
return -1;
offset += digits+1;
line += digits+1;
len -= digits+1;
}
ex = strlen(expect);
if (ex > len)
return -1;
if (memcmp(line, expect, ex))
return -1;
return offset + ex;
}
static void recount_diff(const char *line, int size, struct fragment *fragment)
{
int oldlines = 0, newlines = 0, ret = 0;
if (size < 1) {
warning("recount: ignore empty hunk");
return;
}
for (;;) {
int len = linelen(line, size);
size -= len;
line += len;
if (size < 1)
break;
switch (*line) {
case ' ': case '\n':
newlines++;
/* fall through */
case '-':
oldlines++;
continue;
case '+':
newlines++;
continue;
case '\\':
continue;
case '@':
ret = size < 3 || prefixcmp(line, "@@ ");
break;
case 'd':
ret = size < 5 || prefixcmp(line, "diff ");
break;
default:
ret = -1;
break;
}
if (ret) {
warning(_("recount: unexpected line: %.*s"),
(int)linelen(line, size), line);
return;
}
break;
}
fragment->oldlines = oldlines;
fragment->newlines = newlines;
}
/*
* Parse a unified diff fragment header of the
* form "@@ -a,b +c,d @@"
*/
static int parse_fragment_header(const char *line, int len, struct fragment *fragment)
{
int offset;
if (!len || line[len-1] != '\n')
return -1;
/* Figure out the number of lines in a fragment */
offset = parse_range(line, len, 4, " +", &fragment->oldpos, &fragment->oldlines);
offset = parse_range(line, len, offset, " @@", &fragment->newpos, &fragment->newlines);
return offset;
}
static int find_header(const char *line, unsigned long size, int *hdrsize, struct patch *patch)
{
unsigned long offset, len;
patch->is_toplevel_relative = 0;
patch->is_rename = patch->is_copy = 0;
patch->is_new = patch->is_delete = -1;
patch->old_mode = patch->new_mode = 0;
patch->old_name = patch->new_name = NULL;
for (offset = 0; size > 0; offset += len, size -= len, line += len, linenr++) {
unsigned long nextlen;
len = linelen(line, size);
if (!len)
break;
/* Testing this early allows us to take a few shortcuts.. */
if (len < 6)
continue;
/*
* Make sure we don't find any unconnected patch fragments.
* That's a sign that we didn't find a header, and that a
* patch has become corrupted/broken up.
*/
if (!memcmp("@@ -", line, 4)) {
struct fragment dummy;
if (parse_fragment_header(line, len, &dummy) < 0)
continue;
die(_("patch fragment without header at line %d: %.*s"),
linenr, (int)len-1, line);
}
if (size < len + 6)
break;
/*
* Git patch? It might not have a real patch, just a rename
* or mode change, so we handle that specially
*/
if (!memcmp("diff --git ", line, 11)) {
int git_hdr_len = parse_git_header(line, len, size, patch);
if (git_hdr_len <= len)
continue;
if (!patch->old_name && !patch->new_name) {
if (!patch->def_name)
die(Q_("git diff header lacks filename information when removing "
"%d leading pathname component (line %d)",
"git diff header lacks filename information when removing "
"%d leading pathname components (line %d)",
p_value),
p_value, linenr);
patch->old_name = xstrdup(patch->def_name);
patch->new_name = xstrdup(patch->def_name);
}
if (!patch->is_delete && !patch->new_name)
die("git diff header lacks filename information "
"(line %d)", linenr);
patch->is_toplevel_relative = 1;
*hdrsize = git_hdr_len;
return offset;
}
/* --- followed by +++ ? */
if (memcmp("--- ", line, 4) || memcmp("+++ ", line + len, 4))
continue;
/*
* We only accept unified patches, so we want it to
* at least have "@@ -a,b +c,d @@\n", which is 14 chars
* minimum ("@@ -0,0 +1 @@\n" is the shortest).
*/
nextlen = linelen(line + len, size - len);
if (size < nextlen + 14 || memcmp("@@ -", line + len + nextlen, 4))
continue;
/* Ok, we'll consider it a patch */
parse_traditional_patch(line, line+len, patch);
*hdrsize = len + nextlen;
linenr += 2;
return offset;
}
return -1;
}
static void record_ws_error(unsigned result, const char *line, int len, int linenr)
{
char *err;
if (!result)
return;
whitespace_error++;
if (squelch_whitespace_errors &&
squelch_whitespace_errors < whitespace_error)
return;
err = whitespace_error_string(result);
fprintf(stderr, "%s:%d: %s.\n%.*s\n",
patch_input_file, linenr, err, len, line);
free(err);
}
static void check_whitespace(const char *line, int len, unsigned ws_rule)
{
unsigned result = ws_check(line + 1, len - 1, ws_rule);
record_ws_error(result, line + 1, len - 2, linenr);
}
/*
* Parse a unified diff. Note that this really needs to parse each
* fragment separately, since the only way to know the difference
* between a "---" that is part of a patch, and a "---" that starts
* the next patch is to look at the line counts..
*/
static int parse_fragment(const char *line, unsigned long size,
struct patch *patch, struct fragment *fragment)
{
int added, deleted;
int len = linelen(line, size), offset;
unsigned long oldlines, newlines;
unsigned long leading, trailing;
offset = parse_fragment_header(line, len, fragment);
if (offset < 0)
return -1;
if (offset > 0 && patch->recount)
recount_diff(line + offset, size - offset, fragment);
oldlines = fragment->oldlines;
newlines = fragment->newlines;
leading = 0;
trailing = 0;
/* Parse the thing.. */
line += len;
size -= len;
linenr++;
added = deleted = 0;
for (offset = len;
0 < size;
offset += len, size -= len, line += len, linenr++) {
if (!oldlines && !newlines)
break;
len = linelen(line, size);
if (!len || line[len-1] != '\n')
return -1;
switch (*line) {
default:
return -1;
case '\n': /* newer GNU diff, an empty context line */
case ' ':
oldlines--;
newlines--;
if (!deleted && !added)
leading++;
trailing++;
break;
case '-':
if (apply_in_reverse &&
ws_error_action != nowarn_ws_error)
check_whitespace(line, len, patch->ws_rule);
deleted++;
oldlines--;
trailing = 0;
break;
case '+':
if (!apply_in_reverse &&
ws_error_action != nowarn_ws_error)
check_whitespace(line, len, patch->ws_rule);
added++;
newlines--;
trailing = 0;
break;
/*
* We allow "\ No newline at end of file". Depending
* on locale settings when the patch was produced we
* don't know what this line looks like. The only
* thing we do know is that it begins with "\ ".
* Checking for 12 is just for sanity check -- any
* l10n of "\ No newline..." is at least that long.
*/
case '\\':
if (len < 12 || memcmp(line, "\\ ", 2))
return -1;
break;
}
}
if (oldlines || newlines)
return -1;
fragment->leading = leading;
fragment->trailing = trailing;
/*
* If a fragment ends with an incomplete line, we failed to include
* it in the above loop because we hit oldlines == newlines == 0
* before seeing it.
*/
if (12 < size && !memcmp(line, "\\ ", 2))
offset += linelen(line, size);
patch->lines_added += added;
patch->lines_deleted += deleted;
if (0 < patch->is_new && oldlines)
return error(_("new file depends on old contents"));
if (0 < patch->is_delete && newlines)
return error(_("deleted file still has contents"));
return offset;
}
/*
* We have seen "diff --git a/... b/..." header (or a traditional patch
* header). Read hunks that belong to this patch into fragments and hang
* them to the given patch structure.
*
* The (fragment->patch, fragment->size) pair points into the memory given
* by the caller, not a copy, when we return.
*/
static int parse_single_patch(const char *line, unsigned long size, struct patch *patch)
{
unsigned long offset = 0;
unsigned long oldlines = 0, newlines = 0, context = 0;
struct fragment **fragp = &patch->fragments;
while (size > 4 && !memcmp(line, "@@ -", 4)) {
struct fragment *fragment;
int len;
fragment = xcalloc(1, sizeof(*fragment));
fragment->linenr = linenr;
len = parse_fragment(line, size, patch, fragment);
if (len <= 0)
die(_("corrupt patch at line %d"), linenr);
fragment->patch = line;
fragment->size = len;
oldlines += fragment->oldlines;
newlines += fragment->newlines;
context += fragment->leading + fragment->trailing;
*fragp = fragment;
fragp = &fragment->next;
offset += len;
line += len;
size -= len;
}
/*
* If something was removed (i.e. we have old-lines) it cannot
* be creation, and if something was added it cannot be
* deletion. However, the reverse is not true; --unified=0
* patches that only add are not necessarily creation even
* though they do not have any old lines, and ones that only
* delete are not necessarily deletion.
*
* Unfortunately, a real creation/deletion patch do _not_ have
* any context line by definition, so we cannot safely tell it
* apart with --unified=0 insanity. At least if the patch has
* more than one hunk it is not creation or deletion.
*/
if (patch->is_new < 0 &&
(oldlines || (patch->fragments && patch->fragments->next)))
patch->is_new = 0;
if (patch->is_delete < 0 &&
(newlines || (patch->fragments && patch->fragments->next)))
patch->is_delete = 0;
if (0 < patch->is_new && oldlines)
die(_("new file %s depends on old contents"), patch->new_name);
if (0 < patch->is_delete && newlines)
die(_("deleted file %s still has contents"), patch->old_name);
if (!patch->is_delete && !newlines && context)
fprintf_ln(stderr,
_("** warning: "
"file %s becomes empty but is not deleted"),
patch->new_name);
return offset;
}
static inline int metadata_changes(struct patch *patch)
{
return patch->is_rename > 0 ||
patch->is_copy > 0 ||
patch->is_new > 0 ||
patch->is_delete ||
(patch->old_mode && patch->new_mode &&
patch->old_mode != patch->new_mode);
}
static char *inflate_it(const void *data, unsigned long size,
unsigned long inflated_size)
{
git_zstream stream;
void *out;
int st;
memset(&stream, 0, sizeof(stream));
stream.next_in = (unsigned char *)data;
stream.avail_in = size;
stream.next_out = out = xmalloc(inflated_size);
stream.avail_out = inflated_size;
git_inflate_init(&stream);
st = git_inflate(&stream, Z_FINISH);
git_inflate_end(&stream);
if ((st != Z_STREAM_END) || stream.total_out != inflated_size) {
free(out);
return NULL;
}
return out;
}
/*
* Read a binary hunk and return a new fragment; fragment->patch
* points at an allocated memory that the caller must free, so
* it is marked as "->free_patch = 1".
*/
static struct fragment *parse_binary_hunk(char **buf_p,
unsigned long *sz_p,
int *status_p,
int *used_p)
{
/*
* Expect a line that begins with binary patch method ("literal"
* or "delta"), followed by the length of data before deflating.
* a sequence of 'length-byte' followed by base-85 encoded data
* should follow, terminated by a newline.
*
* Each 5-byte sequence of base-85 encodes up to 4 bytes,
* and we would limit the patch line to 66 characters,
* so one line can fit up to 13 groups that would decode
* to 52 bytes max. The length byte 'A'-'Z' corresponds
* to 1-26 bytes, and 'a'-'z' corresponds to 27-52 bytes.
*/
int llen, used;
unsigned long size = *sz_p;
char *buffer = *buf_p;
int patch_method;
unsigned long origlen;
char *data = NULL;
int hunk_size = 0;
struct fragment *frag;
llen = linelen(buffer, size);
used = llen;
*status_p = 0;
if (!prefixcmp(buffer, "delta ")) {
patch_method = BINARY_DELTA_DEFLATED;
origlen = strtoul(buffer + 6, NULL, 10);
}
else if (!prefixcmp(buffer, "literal ")) {
patch_method = BINARY_LITERAL_DEFLATED;
origlen = strtoul(buffer + 8, NULL, 10);
}
else
return NULL;
linenr++;
buffer += llen;
while (1) {
int byte_length, max_byte_length, newsize;
llen = linelen(buffer, size);
used += llen;
linenr++;
if (llen == 1) {
/* consume the blank line */
buffer++;
size--;
break;
}
/*
* Minimum line is "A00000\n" which is 7-byte long,
* and the line length must be multiple of 5 plus 2.
*/
if ((llen < 7) || (llen-2) % 5)
goto corrupt;
max_byte_length = (llen - 2) / 5 * 4;
byte_length = *buffer;
if ('A' <= byte_length && byte_length <= 'Z')
byte_length = byte_length - 'A' + 1;
else if ('a' <= byte_length && byte_length <= 'z')
byte_length = byte_length - 'a' + 27;
else
goto corrupt;
/* if the input length was not multiple of 4, we would
* have filler at the end but the filler should never
* exceed 3 bytes
*/
if (max_byte_length < byte_length ||
byte_length <= max_byte_length - 4)
goto corrupt;
newsize = hunk_size + byte_length;
data = xrealloc(data, newsize);
if (decode_85(data + hunk_size, buffer + 1, byte_length))
goto corrupt;
hunk_size = newsize;
buffer += llen;
size -= llen;
}
frag = xcalloc(1, sizeof(*frag));
frag->patch = inflate_it(data, hunk_size, origlen);
frag->free_patch = 1;
if (!frag->patch)
goto corrupt;
free(data);
frag->size = origlen;
*buf_p = buffer;
*sz_p = size;
*used_p = used;
frag->binary_patch_method = patch_method;
return frag;
corrupt:
free(data);
*status_p = -1;
error(_("corrupt binary patch at line %d: %.*s"),
linenr-1, llen-1, buffer);
return NULL;
}
static int parse_binary(char *buffer, unsigned long size, struct patch *patch)
{
/*
* We have read "GIT binary patch\n"; what follows is a line
* that says the patch method (currently, either "literal" or
* "delta") and the length of data before deflating; a
* sequence of 'length-byte' followed by base-85 encoded data
* follows.
*
* When a binary patch is reversible, there is another binary
* hunk in the same format, starting with patch method (either
* "literal" or "delta") with the length of data, and a sequence
* of length-byte + base-85 encoded data, terminated with another
* empty line. This data, when applied to the postimage, produces
* the preimage.
*/
struct fragment *forward;
struct fragment *reverse;
int status;
int used, used_1;
forward = parse_binary_hunk(&buffer, &size, &status, &used);
if (!forward && !status)
/* there has to be one hunk (forward hunk) */
return error(_("unrecognized binary patch at line %d"), linenr-1);
if (status)
/* otherwise we already gave an error message */
return status;
reverse = parse_binary_hunk(&buffer, &size, &status, &used_1);
if (reverse)
used += used_1;
else if (status) {
/*
* Not having reverse hunk is not an error, but having
* a corrupt reverse hunk is.
*/
free((void*) forward->patch);
free(forward);
return status;
}
forward->next = reverse;
patch->fragments = forward;
patch->is_binary = 1;
return used;
}
/*
* Read the patch text in "buffer" that extends for "size" bytes; stop
* reading after seeing a single patch (i.e. changes to a single file).
* Create fragments (i.e. patch hunks) and hang them to the given patch.
* Return the number of bytes consumed, so that the caller can call us
* again for the next patch.
*/
static int parse_chunk(char *buffer, unsigned long size, struct patch *patch)
{
int hdrsize, patchsize;
int offset = find_header(buffer, size, &hdrsize, patch);
if (offset < 0)
return offset;
patch->ws_rule = whitespace_rule(patch->new_name
? patch->new_name
: patch->old_name);
patchsize = parse_single_patch(buffer + offset + hdrsize,
size - offset - hdrsize, patch);
if (!patchsize) {
static const char *binhdr[] = {
"Binary files ",
"Files ",
NULL,
};
static const char git_binary[] = "GIT binary patch\n";
int i;
int hd = hdrsize + offset;
unsigned long llen = linelen(buffer + hd, size - hd);
if (llen == sizeof(git_binary) - 1 &&
!memcmp(git_binary, buffer + hd, llen)) {
int used;
linenr++;
used = parse_binary(buffer + hd + llen,
size - hd - llen, patch);
if (used)
patchsize = used + llen;
else
patchsize = 0;
}
else if (!memcmp(" differ\n", buffer + hd + llen - 8, 8)) {
for (i = 0; binhdr[i]; i++) {
int len = strlen(binhdr[i]);
if (len < size - hd &&
!memcmp(binhdr[i], buffer + hd, len)) {
linenr++;
patch->is_binary = 1;
patchsize = llen;
break;
}
}
}
/* Empty patch cannot be applied if it is a text patch
* without metadata change. A binary patch appears
* empty to us here.
*/
if ((apply || check) &&
(!patch->is_binary && !metadata_changes(patch)))
die(_("patch with only garbage at line %d"), linenr);
}
return offset + hdrsize + patchsize;
}
#define swap(a,b) myswap((a),(b),sizeof(a))
#define myswap(a, b, size) do { \
unsigned char mytmp[size]; \
memcpy(mytmp, &a, size); \
memcpy(&a, &b, size); \
memcpy(&b, mytmp, size); \
} while (0)
static void reverse_patches(struct patch *p)
{
for (; p; p = p->next) {
struct fragment *frag = p->fragments;
swap(p->new_name, p->old_name);
swap(p->new_mode, p->old_mode);
swap(p->is_new, p->is_delete);
swap(p->lines_added, p->lines_deleted);
swap(p->old_sha1_prefix, p->new_sha1_prefix);
for (; frag; frag = frag->next) {
swap(frag->newpos, frag->oldpos);
swap(frag->newlines, frag->oldlines);
}
}
}
static const char pluses[] =
"++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++";
static const char minuses[]=
"----------------------------------------------------------------------";
static void show_stats(struct patch *patch)
{
struct strbuf qname = STRBUF_INIT;
char *cp = patch->new_name ? patch->new_name : patch->old_name;
int max, add, del;
quote_c_style(cp, &qname, NULL, 0);
/*
* "scale" the filename
*/
max = max_len;
if (max > 50)
max = 50;
if (qname.len > max) {
cp = strchr(qname.buf + qname.len + 3 - max, '/');
if (!cp)
cp = qname.buf + qname.len + 3 - max;
strbuf_splice(&qname, 0, cp - qname.buf, "...", 3);
}
if (patch->is_binary) {
printf(" %-*s | Bin\n", max, qname.buf);
strbuf_release(&qname);
return;
}
printf(" %-*s |", max, qname.buf);
strbuf_release(&qname);
/*
* scale the add/delete
*/
max = max + max_change > 70 ? 70 - max : max_change;
add = patch->lines_added;
del = patch->lines_deleted;
if (max_change > 0) {
int total = ((add + del) * max + max_change / 2) / max_change;
add = (add * max + max_change / 2) / max_change;
del = total - add;
}
printf("%5d %.*s%.*s\n", patch->lines_added + patch->lines_deleted,
add, pluses, del, minuses);
}
static int read_old_data(struct stat *st, const char *path, struct strbuf *buf)
{
switch (st->st_mode & S_IFMT) {
case S_IFLNK:
if (strbuf_readlink(buf, path, st->st_size) < 0)
return error(_("unable to read symlink %s"), path);
return 0;
case S_IFREG:
if (strbuf_read_file(buf, path, st->st_size) != st->st_size)
return error(_("unable to open or read %s"), path);
convert_to_git(path, buf->buf, buf->len, buf, 0);
return 0;
default:
return -1;
}
}
/*
* Update the preimage, and the common lines in postimage,
* from buffer buf of length len. If postlen is 0 the postimage
* is updated in place, otherwise it's updated on a new buffer
* of length postlen
*/
static void update_pre_post_images(struct image *preimage,
struct image *postimage,
char *buf,
size_t len, size_t postlen)
{
int i, ctx, reduced;
char *new, *old, *fixed;
struct image fixed_preimage;
/*
* Update the preimage with whitespace fixes. Note that we
* are not losing preimage->buf -- apply_one_fragment() will
* free "oldlines".
*/
prepare_image(&fixed_preimage, buf, len, 1);
assert(postlen
? fixed_preimage.nr == preimage->nr
: fixed_preimage.nr <= preimage->nr);
for (i = 0; i < fixed_preimage.nr; i++)
fixed_preimage.line[i].flag = preimage->line[i].flag;
free(preimage->line_allocated);
*preimage = fixed_preimage;
/*
* Adjust the common context lines in postimage. This can be
* done in-place when we are shrinking it with whitespace
* fixing, but needs a new buffer when ignoring whitespace or
* expanding leading tabs to spaces.
*
* We trust the caller to tell us if the update can be done
* in place (postlen==0) or not.
*/
old = postimage->buf;
if (postlen)
new = postimage->buf = xmalloc(postlen);
else
new = old;
fixed = preimage->buf;
for (i = reduced = ctx = 0; i < postimage->nr; i++) {
size_t len = postimage->line[i].len;
if (!(postimage->line[i].flag & LINE_COMMON)) {
/* an added line -- no counterparts in preimage */
memmove(new, old, len);
old += len;
new += len;
continue;
}
/* a common context -- skip it in the original postimage */
old += len;
/* and find the corresponding one in the fixed preimage */
while (ctx < preimage->nr &&
!(preimage->line[ctx].flag & LINE_COMMON)) {
fixed += preimage->line[ctx].len;
ctx++;
}
/*
* preimage is expected to run out, if the caller
* fixed addition of trailing blank lines.
*/
if (preimage->nr <= ctx) {
reduced++;
continue;
}
/* and copy it in, while fixing the line length */
len = preimage->line[ctx].len;
memcpy(new, fixed, len);
new += len;
fixed += len;
postimage->line[i].len = len;
ctx++;
}
/* Fix the length of the whole thing */
postimage->len = new - postimage->buf;
postimage->nr -= reduced;
}
static int match_fragment(struct image *img,
struct image *preimage,
struct image *postimage,
unsigned long try,
int try_lno,
unsigned ws_rule,
int match_beginning, int match_end)
{
int i;
char *fixed_buf, *buf, *orig, *target;
struct strbuf fixed;
size_t fixed_len, postlen;
int preimage_limit;
if (preimage->nr + try_lno <= img->nr) {
/*
* The hunk falls within the boundaries of img.
*/
preimage_limit = preimage->nr;
if (match_end && (preimage->nr + try_lno != img->nr))
return 0;
} else if (ws_error_action == correct_ws_error &&
(ws_rule & WS_BLANK_AT_EOF)) {
/*
* This hunk extends beyond the end of img, and we are
* removing blank lines at the end of the file. This
* many lines from the beginning of the preimage must
* match with img, and the remainder of the preimage
* must be blank.
*/
preimage_limit = img->nr - try_lno;
} else {
/*
* The hunk extends beyond the end of the img and
* we are not removing blanks at the end, so we
* should reject the hunk at this position.
*/
return 0;
}
if (match_beginning && try_lno)
return 0;
/* Quick hash check */
for (i = 0; i < preimage_limit; i++)
if ((img->line[try_lno + i].flag & LINE_PATCHED) ||
(preimage->line[i].hash != img->line[try_lno + i].hash))
return 0;
if (preimage_limit == preimage->nr) {
/*
* Do we have an exact match? If we were told to match
* at the end, size must be exactly at try+fragsize,
* otherwise try+fragsize must be still within the preimage,
* and either case, the old piece should match the preimage
* exactly.
*/
if ((match_end
? (try + preimage->len == img->len)
: (try + preimage->len <= img->len)) &&
!memcmp(img->buf + try, preimage->buf, preimage->len))
return 1;
} else {
/*
* The preimage extends beyond the end of img, so
* there cannot be an exact match.
*
* There must be one non-blank context line that match
* a line before the end of img.
*/
char *buf_end;
buf = preimage->buf;
buf_end = buf;
for (i = 0; i < preimage_limit; i++)
buf_end += preimage->line[i].len;
for ( ; buf < buf_end; buf++)
if (!isspace(*buf))
break;
if (buf == buf_end)
return 0;
}
/*
* No exact match. If we are ignoring whitespace, run a line-by-line
* fuzzy matching. We collect all the line length information because
* we need it to adjust whitespace if we match.
*/
if (ws_ignore_action == ignore_ws_change) {
size_t imgoff = 0;
size_t preoff = 0;
size_t postlen = postimage->len;
size_t extra_chars;
char *preimage_eof;
char *preimage_end;
for (i = 0; i < preimage_limit; i++) {
size_t prelen = preimage->line[i].len;
size_t imglen = img->line[try_lno+i].len;
if (!fuzzy_matchlines(img->buf + try + imgoff, imglen,
preimage->buf + preoff, prelen))
return 0;
if (preimage->line[i].flag & LINE_COMMON)
postlen += imglen - prelen;
imgoff += imglen;
preoff += prelen;
}
/*
* Ok, the preimage matches with whitespace fuzz.
*
* imgoff now holds the true length of the target that
* matches the preimage before the end of the file.
*
* Count the number of characters in the preimage that fall
* beyond the end of the file and make sure that all of them
* are whitespace characters. (This can only happen if
* we are removing blank lines at the end of the file.)
*/
buf = preimage_eof = preimage->buf + preoff;
for ( ; i < preimage->nr; i++)
preoff += preimage->line[i].len;
preimage_end = preimage->buf + preoff;
for ( ; buf < preimage_end; buf++)
if (!isspace(*buf))
return 0;
/*
* Update the preimage and the common postimage context
* lines to use the same whitespace as the target.
* If whitespace is missing in the target (i.e.
* if the preimage extends beyond the end of the file),
* use the whitespace from the preimage.
*/
extra_chars = preimage_end - preimage_eof;
strbuf_init(&fixed, imgoff + extra_chars);
strbuf_add(&fixed, img->buf + try, imgoff);
strbuf_add(&fixed, preimage_eof, extra_chars);
fixed_buf = strbuf_detach(&fixed, &fixed_len);
update_pre_post_images(preimage, postimage,
fixed_buf, fixed_len, postlen);
return 1;
}
if (ws_error_action != correct_ws_error)
return 0;
/*
* The hunk does not apply byte-by-byte, but the hash says
* it might with whitespace fuzz. We haven't been asked to
* ignore whitespace, we were asked to correct whitespace
* errors, so let's try matching after whitespace correction.
*
* The preimage may extend beyond the end of the file,
* but in this loop we will only handle the part of the
* preimage that falls within the file.
*/
strbuf_init(&fixed, preimage->len + 1);
orig = preimage->buf;
target = img->buf + try;
postlen = 0;
for (i = 0; i < preimage_limit; i++) {
size_t oldlen = preimage->line[i].len;
size_t tgtlen = img->line[try_lno + i].len;
size_t fixstart = fixed.len;
struct strbuf tgtfix;
int match;
/* Try fixing the line in the preimage */
ws_fix_copy(&fixed, orig, oldlen, ws_rule, NULL);
/* Try fixing the line in the target */
strbuf_init(&tgtfix, tgtlen);
ws_fix_copy(&tgtfix, target, tgtlen, ws_rule, NULL);
/*
* If they match, either the preimage was based on
* a version before our tree fixed whitespace breakage,
* or we are lacking a whitespace-fix patch the tree
* the preimage was based on already had (i.e. target
* has whitespace breakage, the preimage doesn't).
* In either case, we are fixing the whitespace breakages
* so we might as well take the fix together with their
* real change.
*/
match = (tgtfix.len == fixed.len - fixstart &&
!memcmp(tgtfix.buf, fixed.buf + fixstart,
fixed.len - fixstart));
postlen += tgtfix.len;
strbuf_release(&tgtfix);
if (!match)
goto unmatch_exit;
orig += oldlen;
target += tgtlen;
}
/*
* Now handle the lines in the preimage that falls beyond the
* end of the file (if any). They will only match if they are
* empty or only contain whitespace (if WS_BLANK_AT_EOL is
* false).
*/
for ( ; i < preimage->nr; i++) {
size_t fixstart = fixed.len; /* start of the fixed preimage */
size_t oldlen = preimage->line[i].len;
int j;
/* Try fixing the line in the preimage */
ws_fix_copy(&fixed, orig, oldlen, ws_rule, NULL);
for (j = fixstart; j < fixed.len; j++)
if (!isspace(fixed.buf[j]))
goto unmatch_exit;
orig += oldlen;
}
/*
* Yes, the preimage is based on an older version that still
* has whitespace breakages unfixed, and fixing them makes the
* hunk match. Update the context lines in the postimage.
*/
fixed_buf = strbuf_detach(&fixed, &fixed_len);
if (postlen < postimage->len)
postlen = 0;
update_pre_post_images(preimage, postimage,
fixed_buf, fixed_len, postlen);
return 1;
unmatch_exit:
strbuf_release(&fixed);
return 0;
}
static int find_pos(struct image *img,
struct image *preimage,
struct image *postimage,
int line,
unsigned ws_rule,
int match_beginning, int match_end)
{
int i;
unsigned long backwards, forwards, try;
int backwards_lno, forwards_lno, try_lno;
/*
* If match_beginning or match_end is specified, there is no
* point starting from a wrong line that will never match and
* wander around and wait for a match at the specified end.
*/
if (match_beginning)
line = 0;
else if (match_end)
line = img->nr - preimage->nr;
/*
* Because the comparison is unsigned, the following test
* will also take care of a negative line number that can
* result when match_end and preimage is larger than the target.
*/
if ((size_t) line > img->nr)
line = img->nr;
try = 0;
for (i = 0; i < line; i++)
try += img->line[i].len;
/*
* There's probably some smart way to do this, but I'll leave
* that to the smart and beautiful people. I'm simple and stupid.
*/
backwards = try;
backwards_lno = line;
forwards = try;
forwards_lno = line;
try_lno = line;
for (i = 0; ; i++) {
if (match_fragment(img, preimage, postimage,
try, try_lno, ws_rule,
match_beginning, match_end))
return try_lno;
again:
if (backwards_lno == 0 && forwards_lno == img->nr)
break;
if (i & 1) {
if (backwards_lno == 0) {
i++;
goto again;
}
backwards_lno--;
backwards -= img->line[backwards_lno].len;
try = backwards;
try_lno = backwards_lno;
} else {
if (forwards_lno == img->nr) {
i++;
goto again;
}
forwards += img->line[forwards_lno].len;
forwards_lno++;
try = forwards;
try_lno = forwards_lno;
}
}
return -1;
}
static void remove_first_line(struct image *img)
{
img->buf += img->line[0].len;
img->len -= img->line[0].len;
img->line++;
img->nr--;
}
static void remove_last_line(struct image *img)
{
img->len -= img->line[--img->nr].len;
}
/*
* The change from "preimage" and "postimage" has been found to
* apply at applied_pos (counts in line numbers) in "img".
* Update "img" to remove "preimage" and replace it with "postimage".
*/
static void update_image(struct image *img,
int applied_pos,
struct image *preimage,
struct image *postimage)
{
/*
* remove the copy of preimage at offset in img
* and replace it with postimage
*/
int i, nr;
size_t remove_count, insert_count, applied_at = 0;
char *result;
int preimage_limit;
/*
* If we are removing blank lines at the end of img,
* the preimage may extend beyond the end.
* If that is the case, we must be careful only to
* remove the part of the preimage that falls within
* the boundaries of img. Initialize preimage_limit
* to the number of lines in the preimage that falls
* within the boundaries.
*/
preimage_limit = preimage->nr;
if (preimage_limit > img->nr - applied_pos)
preimage_limit = img->nr - applied_pos;
for (i = 0; i < applied_pos; i++)
applied_at += img->line[i].len;
remove_count = 0;
for (i = 0; i < preimage_limit; i++)
remove_count += img->line[applied_pos + i].len;
insert_count = postimage->len;
/* Adjust the contents */
result = xmalloc(img->len + insert_count - remove_count + 1);
memcpy(result, img->buf, applied_at);
memcpy(result + applied_at, postimage->buf, postimage->len);
memcpy(result + applied_at + postimage->len,
img->buf + (applied_at + remove_count),
img->len - (applied_at + remove_count));
free(img->buf);
img->buf = result;
img->len += insert_count - remove_count;
result[img->len] = '\0';
/* Adjust the line table */
nr = img->nr + postimage->nr - preimage_limit;
if (preimage_limit < postimage->nr) {
/*
* NOTE: this knows that we never call remove_first_line()
* on anything other than pre/post image.
*/
img->line = xrealloc(img->line, nr * sizeof(*img->line));
img->line_allocated = img->line;
}
if (preimage_limit != postimage->nr)
memmove(img->line + applied_pos + postimage->nr,
img->line + applied_pos + preimage_limit,
(img->nr - (applied_pos + preimage_limit)) *
sizeof(*img->line));
memcpy(img->line + applied_pos,
postimage->line,
postimage->nr * sizeof(*img->line));
if (!allow_overlap)
for (i = 0; i < postimage->nr; i++)
img->line[applied_pos + i].flag |= LINE_PATCHED;
img->nr = nr;
}
/*
* Use the patch-hunk text in "frag" to prepare two images (preimage and
* postimage) for the hunk. Find lines that match "preimage" in "img" and
* replace the part of "img" with "postimage" text.
*/
static int apply_one_fragment(struct image *img, struct fragment *frag,
int inaccurate_eof, unsigned ws_rule,
int nth_fragment)
{
int match_beginning, match_end;
const char *patch = frag->patch;
int size = frag->size;
char *old, *oldlines;
struct strbuf newlines;
int new_blank_lines_at_end = 0;
int found_new_blank_lines_at_end = 0;
int hunk_linenr = frag->linenr;
unsigned long leading, trailing;
int pos, applied_pos;
struct image preimage;
struct image postimage;
memset(&preimage, 0, sizeof(preimage));
memset(&postimage, 0, sizeof(postimage));
oldlines = xmalloc(size);
strbuf_init(&newlines, size);
old = oldlines;
while (size > 0) {
char first;
int len = linelen(patch, size);
int plen;
int added_blank_line = 0;
int is_blank_context = 0;
size_t start;
if (!len)
break;
/*
* "plen" is how much of the line we should use for
* the actual patch data. Normally we just remove the
* first character on the line, but if the line is
* followed by "\ No newline", then we also remove the
* last one (which is the newline, of course).
*/
plen = len - 1;
if (len < size && patch[len] == '\\')
plen--;
first = *patch;
if (apply_in_reverse) {
if (first == '-')
first = '+';
else if (first == '+')
first = '-';
}
switch (first) {
case '\n':
/* Newer GNU diff, empty context line */
if (plen < 0)
/* ... followed by '\No newline'; nothing */
break;
*old++ = '\n';
strbuf_addch(&newlines, '\n');
add_line_info(&preimage, "\n", 1, LINE_COMMON);
add_line_info(&postimage, "\n", 1, LINE_COMMON);
is_blank_context = 1;
break;
case ' ':
if (plen && (ws_rule & WS_BLANK_AT_EOF) &&
ws_blank_line(patch + 1, plen, ws_rule))
is_blank_context = 1;
case '-':
memcpy(old, patch + 1, plen);
add_line_info(&preimage, old, plen,
(first == ' ' ? LINE_COMMON : 0));
old += plen;
if (first == '-')
break;
/* Fall-through for ' ' */
case '+':
/* --no-add does not add new lines */
if (first == '+' && no_add)
break;
start = newlines.len;
if (first != '+' ||
!whitespace_error ||
ws_error_action != correct_ws_error) {
strbuf_add(&newlines, patch + 1, plen);
}
else {
ws_fix_copy(&newlines, patch + 1, plen, ws_rule, &applied_after_fixing_ws);
}
add_line_info(&postimage, newlines.buf + start, newlines.len - start,
(first == '+' ? 0 : LINE_COMMON));
if (first == '+' &&
(ws_rule & WS_BLANK_AT_EOF) &&
ws_blank_line(patch + 1, plen, ws_rule))
added_blank_line = 1;
break;
case '@': case '\\':
/* Ignore it, we already handled it */
break;
default:
if (apply_verbosely)
error(_("invalid start of line: '%c'"), first);
return -1;
}
if (added_blank_line) {
if (!new_blank_lines_at_end)
found_new_blank_lines_at_end = hunk_linenr;
new_blank_lines_at_end++;
}
else if (is_blank_context)
;
else
new_blank_lines_at_end = 0;
patch += len;
size -= len;
hunk_linenr++;
}
if (inaccurate_eof &&
old > oldlines && old[-1] == '\n' &&
newlines.len > 0 && newlines.buf[newlines.len - 1] == '\n') {
old--;
strbuf_setlen(&newlines, newlines.len - 1);
}
leading = frag->leading;
trailing = frag->trailing;
/*
* A hunk to change lines at the beginning would begin with
* @@ -1,L +N,M @@
* but we need to be careful. -U0 that inserts before the second
* line also has this pattern.
*
* And a hunk to add to an empty file would begin with
* @@ -0,0 +N,M @@
*
* In other words, a hunk that is (frag->oldpos <= 1) with or
* without leading context must match at the beginning.
*/
match_beginning = (!frag->oldpos ||
(frag->oldpos == 1 && !unidiff_zero));
/*
* A hunk without trailing lines must match at the end.
* However, we simply cannot tell if a hunk must match end
* from the lack of trailing lines if the patch was generated
* with unidiff without any context.
*/
match_end = !unidiff_zero && !trailing;
pos = frag->newpos ? (frag->newpos - 1) : 0;
preimage.buf = oldlines;
preimage.len = old - oldlines;
postimage.buf = newlines.buf;
postimage.len = newlines.len;
preimage.line = preimage.line_allocated;
postimage.line = postimage.line_allocated;
for (;;) {
applied_pos = find_pos(img, &preimage, &postimage, pos,
ws_rule, match_beginning, match_end);
if (applied_pos >= 0)
break;
/* Am I at my context limits? */
if ((leading <= p_context) && (trailing <= p_context))
break;
if (match_beginning || match_end) {
match_beginning = match_end = 0;
continue;
}
/*
* Reduce the number of context lines; reduce both
* leading and trailing if they are equal otherwise
* just reduce the larger context.
*/
if (leading >= trailing) {
remove_first_line(&preimage);
remove_first_line(&postimage);
pos--;
leading--;
}
if (trailing > leading) {
remove_last_line(&preimage);
remove_last_line(&postimage);
trailing--;
}
}
if (applied_pos >= 0) {
if (new_blank_lines_at_end &&
preimage.nr + applied_pos >= img->nr &&
(ws_rule & WS_BLANK_AT_EOF) &&
ws_error_action != nowarn_ws_error) {
record_ws_error(WS_BLANK_AT_EOF, "+", 1,
found_new_blank_lines_at_end);
if (ws_error_action == correct_ws_error) {
while (new_blank_lines_at_end--)
remove_last_line(&postimage);
}
/*
* We would want to prevent write_out_results()
* from taking place in apply_patch() that follows
* the callchain led us here, which is:
* apply_patch->check_patch_list->check_patch->
* apply_data->apply_fragments->apply_one_fragment
*/
if (ws_error_action == die_on_ws_error)
apply = 0;
}
if (apply_verbosely && applied_pos != pos) {
int offset = applied_pos - pos;
if (apply_in_reverse)
offset = 0 - offset;
fprintf_ln(stderr,
Q_("Hunk #%d succeeded at %d (offset %d line).",
"Hunk #%d succeeded at %d (offset %d lines).",
offset),
nth_fragment, applied_pos + 1, offset);
}
/*
* Warn if it was necessary to reduce the number
* of context lines.
*/
if ((leading != frag->leading) ||
(trailing != frag->trailing))
fprintf_ln(stderr, _("Context reduced to (%ld/%ld)"
" to apply fragment at %d"),
leading, trailing, applied_pos+1);
update_image(img, applied_pos, &preimage, &postimage);
} else {
if (apply_verbosely)
error(_("while searching for:\n%.*s"),
(int)(old - oldlines), oldlines);
}
free(oldlines);
strbuf_release(&newlines);
free(preimage.line_allocated);
free(postimage.line_allocated);
return (applied_pos < 0);
}
static int apply_binary_fragment(struct image *img, struct patch *patch)
{
struct fragment *fragment = patch->fragments;
unsigned long len;
void *dst;
if (!fragment)
return error(_("missing binary patch data for '%s'"),
patch->new_name ?
patch->new_name :
patch->old_name);
/* Binary patch is irreversible without the optional second hunk */
if (apply_in_reverse) {
if (!fragment->next)
return error("cannot reverse-apply a binary patch "
"without the reverse hunk to '%s'",
patch->new_name
? patch->new_name : patch->old_name);
fragment = fragment->next;
}
switch (fragment->binary_patch_method) {
case BINARY_DELTA_DEFLATED:
dst = patch_delta(img->buf, img->len, fragment->patch,
fragment->size, &len);
if (!dst)
return -1;
clear_image(img);
img->buf = dst;
img->len = len;
return 0;
case BINARY_LITERAL_DEFLATED:
clear_image(img);
img->len = fragment->size;
img->buf = xmalloc(img->len+1);
memcpy(img->buf, fragment->patch, img->len);
img->buf[img->len] = '\0';
return 0;
}
return -1;
}
/*
* Replace "img" with the result of applying the binary patch.
* The binary patch data itself in patch->fragment is still kept
* but the preimage prepared by the caller in "img" is freed here
* or in the helper function apply_binary_fragment() this calls.
*/
static int apply_binary(struct image *img, struct patch *patch)
{
const char *name = patch->old_name ? patch->old_name : patch->new_name;
unsigned char sha1[20];
/*
* For safety, we require patch index line to contain
* full 40-byte textual SHA1 for old and new, at least for now.
*/
if (strlen(patch->old_sha1_prefix) != 40 ||
strlen(patch->new_sha1_prefix) != 40 ||
get_sha1_hex(patch->old_sha1_prefix, sha1) ||
get_sha1_hex(patch->new_sha1_prefix, sha1))
return error("cannot apply binary patch to '%s' "
"without full index line", name);
if (patch->old_name) {
/*
* See if the old one matches what the patch
* applies to.
*/
hash_sha1_file(img->buf, img->len, blob_type, sha1);
if (strcmp(sha1_to_hex(sha1), patch->old_sha1_prefix))
return error("the patch applies to '%s' (%s), "
"which does not match the "
"current contents.",
name, sha1_to_hex(sha1));
}
else {
/* Otherwise, the old one must be empty. */
if (img->len)
return error("the patch applies to an empty "
"'%s' but it is not empty", name);
}
get_sha1_hex(patch->new_sha1_prefix, sha1);
if (is_null_sha1(sha1)) {
clear_image(img);
return 0; /* deletion patch */
}
if (has_sha1_file(sha1)) {
/* We already have the postimage */
enum object_type type;
unsigned long size;
char *result;
result = read_sha1_file(sha1, &type, &size);
if (!result)
return error("the necessary postimage %s for "
"'%s' cannot be read",
patch->new_sha1_prefix, name);
clear_image(img);
img->buf = result;
img->len = size;
} else {
/*
* We have verified buf matches the preimage;
* apply the patch data to it, which is stored
* in the patch->fragments->{patch,size}.
*/
if (apply_binary_fragment(img, patch))
return error(_("binary patch does not apply to '%s'"),
name);
/* verify that the result matches */
hash_sha1_file(img->buf, img->len, blob_type, sha1);
if (strcmp(sha1_to_hex(sha1), patch->new_sha1_prefix))
return error(_("binary patch to '%s' creates incorrect result (expecting %s, got %s)"),
name, patch->new_sha1_prefix, sha1_to_hex(sha1));
}
return 0;
}
static int apply_fragments(struct image *img, struct patch *patch)
{
struct fragment *frag = patch->fragments;
const char *name = patch->old_name ? patch->old_name : patch->new_name;
unsigned ws_rule = patch->ws_rule;
unsigned inaccurate_eof = patch->inaccurate_eof;
int nth = 0;
if (patch->is_binary)
return apply_binary(img, patch);
while (frag) {
nth++;
if (apply_one_fragment(img, frag, inaccurate_eof, ws_rule, nth)) {
error(_("patch failed: %s:%ld"), name, frag->oldpos);
if (!apply_with_reject)
return -1;
frag->rejected = 1;
}
frag = frag->next;
}
return 0;
}
static int read_blob_object(struct strbuf *buf, const unsigned char *sha1, unsigned mode)
{
if (S_ISGITLINK(mode)) {
strbuf_grow(buf, 100);
strbuf_addf(buf, "Subproject commit %s\n", sha1_to_hex(sha1));
} else {
enum object_type type;
unsigned long sz;
char *result;
result = read_sha1_file(sha1, &type, &sz);
if (!result)
return -1;
/* XXX read_sha1_file NUL-terminates */
strbuf_attach(buf, result, sz, sz + 1);
}
return 0;
}
static int read_file_or_gitlink(struct cache_entry *ce, struct strbuf *buf)
{
if (!ce)
return 0;
return read_blob_object(buf, ce->sha1, ce->ce_mode);
}
static struct patch *in_fn_table(const char *name)
{
struct string_list_item *item;
if (name == NULL)
return NULL;
item = string_list_lookup(&fn_table, name);
if (item != NULL)
return (struct patch *)item->util;
return NULL;
}
/*
* item->util in the filename table records the status of the path.
* Usually it points at a patch (whose result records the contents
* of it after applying it), but it could be PATH_WAS_DELETED for a
* path that a previously applied patch has already removed, or
* PATH_TO_BE_DELETED for a path that a later patch would remove.
*
* The latter is needed to deal with a case where two paths A and B
* are swapped by first renaming A to B and then renaming B to A;
* moving A to B should not be prevented due to presence of B as we
* will remove it in a later patch.
*/
#define PATH_TO_BE_DELETED ((struct patch *) -2)
#define PATH_WAS_DELETED ((struct patch *) -1)
static int to_be_deleted(struct patch *patch)
{
return patch == PATH_TO_BE_DELETED;
}
static int was_deleted(struct patch *patch)
{
return patch == PATH_WAS_DELETED;
}
static void add_to_fn_table(struct patch *patch)
{
struct string_list_item *item;
/*
* Always add new_name unless patch is a deletion
* This should cover the cases for normal diffs,
* file creations and copies
*/
if (patch->new_name != NULL) {
item = string_list_insert(&fn_table, patch->new_name);
item->util = patch;
}
/*
* store a failure on rename/deletion cases because
* later chunks shouldn't patch old names
*/
if ((patch->new_name == NULL) || (patch->is_rename)) {
item = string_list_insert(&fn_table, patch->old_name);
item->util = PATH_WAS_DELETED;
}
}
static void prepare_fn_table(struct patch *patch)
{
/*
* store information about incoming file deletion
*/
while (patch) {
if ((patch->new_name == NULL) || (patch->is_rename)) {
struct string_list_item *item;
item = string_list_insert(&fn_table, patch->old_name);
item->util = PATH_TO_BE_DELETED;
}
patch = patch->next;
}
}
static int checkout_target(struct cache_entry *ce, struct stat *st)
{
struct checkout costate;
memset(&costate, 0, sizeof(costate));
costate.base_dir = "";
costate.refresh_cache = 1;
if (checkout_entry(ce, &costate, NULL) || lstat(ce->name, st))
return error(_("cannot checkout %s"), ce->name);
return 0;
}
static struct patch *previous_patch(struct patch *patch, int *gone)
{
struct patch *previous;
*gone = 0;
if (patch->is_copy || patch->is_rename)
return NULL; /* "git" patches do not depend on the order */
previous = in_fn_table(patch->old_name);
if (!previous)
return NULL;
if (to_be_deleted(previous))
return NULL; /* the deletion hasn't happened yet */
if (was_deleted(previous))
*gone = 1;
return previous;
}
static int verify_index_match(struct cache_entry *ce, struct stat *st)
{
if (S_ISGITLINK(ce->ce_mode)) {
if (!S_ISDIR(st->st_mode))
return -1;
return 0;
}
return ce_match_stat(ce, st, CE_MATCH_IGNORE_VALID|CE_MATCH_IGNORE_SKIP_WORKTREE);
}
#define SUBMODULE_PATCH_WITHOUT_INDEX 1
static int load_patch_target(struct strbuf *buf,
struct cache_entry *ce,
struct stat *st,
const char *name,
unsigned expected_mode)
{
if (cached) {
if (read_file_or_gitlink(ce, buf))
return error(_("read of %s failed"), name);
} else if (name) {
if (S_ISGITLINK(expected_mode)) {
if (ce)
return read_file_or_gitlink(ce, buf);
else
return SUBMODULE_PATCH_WITHOUT_INDEX;
} else {
if (read_old_data(st, name, buf))
return error(_("read of %s failed"), name);
}
}
return 0;
}
/*
* We are about to apply "patch"; populate the "image" with the
* current version we have, from the working tree or from the index,
* depending on the situation e.g. --cached/--index. If we are
* applying a non-git patch that incrementally updates the tree,
* we read from the result of a previous diff.
*/
static int load_preimage(struct image *image,
struct patch *patch, struct stat *st, struct cache_entry *ce)
{
struct strbuf buf = STRBUF_INIT;
size_t len;
char *img;
struct patch *previous;
int status;
previous = previous_patch(patch, &status);
if (status)
return error(_("path %s has been renamed/deleted"),
patch->old_name);
if (previous) {
/* We have a patched copy in memory; use that. */
strbuf_add(&buf, previous->result, previous->resultsize);
} else {
status = load_patch_target(&buf, ce, st,
patch->old_name, patch->old_mode);
if (status < 0)
return status;
else if (status == SUBMODULE_PATCH_WITHOUT_INDEX) {
/*
* There is no way to apply subproject
* patch without looking at the index.
* NEEDSWORK: shouldn't this be flagged
* as an error???
*/
free_fragment_list(patch->fragments);
patch->fragments = NULL;
} else if (status) {
return error(_("read of %s failed"), patch->old_name);
}
}
img = strbuf_detach(&buf, &len);
prepare_image(image, img, len, !patch->is_binary);
return 0;
}
static int three_way_merge(struct image *image,
char *path,
const unsigned char *base,
const unsigned char *ours,
const unsigned char *theirs)
{
mmfile_t base_file, our_file, their_file;
mmbuffer_t result = { NULL };
int status;
read_mmblob(&base_file, base);
read_mmblob(&our_file, ours);
read_mmblob(&their_file, theirs);
status = ll_merge(&result, path,
&base_file, "base",
&our_file, "ours",
&their_file, "theirs", NULL);
free(base_file.ptr);
free(our_file.ptr);
free(their_file.ptr);
if (status < 0 || !result.ptr) {
free(result.ptr);
return -1;
}
clear_image(image);
image->buf = result.ptr;
image->len = result.size;
return status;
}
/*
* When directly falling back to add/add three-way merge, we read from
* the current contents of the new_name. In no cases other than that
* this function will be called.
*/
static int load_current(struct image *image, struct patch *patch)
{
struct strbuf buf = STRBUF_INIT;
int status, pos;
size_t len;
char *img;
struct stat st;
struct cache_entry *ce;
char *name = patch->new_name;
unsigned mode = patch->new_mode;
if (!patch->is_new)
die("BUG: patch to %s is not a creation", patch->old_name);
pos = cache_name_pos(name, strlen(name));
if (pos < 0)
return error(_("%s: does not exist in index"), name);
ce = active_cache[pos];
if (lstat(name, &st)) {
if (errno != ENOENT)
return error(_("%s: %s"), name, strerror(errno));
if (checkout_target(ce, &st))
return -1;
}
if (verify_index_match(ce, &st))
return error(_("%s: does not match index"), name);
status = load_patch_target(&buf, ce, &st, name, mode);
if (status < 0)
return status;
else if (status)
return -1;
img = strbuf_detach(&buf, &len);
prepare_image(image, img, len, !patch->is_binary);
return 0;
}
static int try_threeway(struct image *image, struct patch *patch,
struct stat *st, struct cache_entry *ce)
{
unsigned char pre_sha1[20], post_sha1[20], our_sha1[20];
struct strbuf buf = STRBUF_INIT;
size_t len;
int status;
char *img;
struct image tmp_image;
/* No point falling back to 3-way merge in these cases */
if (patch->is_delete ||
S_ISGITLINK(patch->old_mode) || S_ISGITLINK(patch->new_mode))
return -1;
/* Preimage the patch was prepared for */
if (patch->is_new)
write_sha1_file("", 0, blob_type, pre_sha1);
else if (get_sha1(patch->old_sha1_prefix, pre_sha1) ||
read_blob_object(&buf, pre_sha1, patch->old_mode))
return error("repository lacks the necessary blob to fall back on 3-way merge.");
fprintf(stderr, "Falling back to three-way merge...\n");
img = strbuf_detach(&buf, &len);
prepare_image(&tmp_image, img, len, 1);
/* Apply the patch to get the post image */
if (apply_fragments(&tmp_image, patch) < 0) {
clear_image(&tmp_image);
return -1;
}
/* post_sha1[] is theirs */
write_sha1_file(tmp_image.buf, tmp_image.len, blob_type, post_sha1);
clear_image(&tmp_image);
/* our_sha1[] is ours */
if (patch->is_new) {
if (load_current(&tmp_image, patch))
return error("cannot read the current contents of '%s'",
patch->new_name);
} else {
if (load_preimage(&tmp_image, patch, st, ce))
return error("cannot read the current contents of '%s'",
patch->old_name);
}
write_sha1_file(tmp_image.buf, tmp_image.len, blob_type, our_sha1);
clear_image(&tmp_image);
/* in-core three-way merge between post and our using pre as base */
status = three_way_merge(image, patch->new_name,
pre_sha1, our_sha1, post_sha1);
if (status < 0) {
fprintf(stderr, "Failed to fall back on three-way merge...\n");
return status;
}
if (status) {
patch->conflicted_threeway = 1;
if (patch->is_new)
hashclr(patch->threeway_stage[0]);
else
hashcpy(patch->threeway_stage[0], pre_sha1);
hashcpy(patch->threeway_stage[1], our_sha1);
hashcpy(patch->threeway_stage[2], post_sha1);
fprintf(stderr, "Applied patch to '%s' with conflicts.\n", patch->new_name);
} else {
fprintf(stderr, "Applied patch to '%s' cleanly.\n", patch->new_name);
}
return 0;
}
static int apply_data(struct patch *patch, struct stat *st, struct cache_entry *ce)
{
struct image image;
if (load_preimage(&image, patch, st, ce) < 0)
return -1;
if (patch->direct_to_threeway ||
apply_fragments(&image, patch) < 0) {
/* Note: with --reject, apply_fragments() returns 0 */
if (!threeway || try_threeway(&image, patch, st, ce) < 0)
return -1;
}
patch->result = image.buf;
patch->resultsize = image.len;
add_to_fn_table(patch);
free(image.line_allocated);
if (0 < patch->is_delete && patch->resultsize)
return error(_("removal patch leaves file contents"));
return 0;
}
/*
* If "patch" that we are looking at modifies or deletes what we have,
* we would want it not to lose any local modification we have, either
* in the working tree or in the index.
*
* This also decides if a non-git patch is a creation patch or a
* modification to an existing empty file. We do not check the state
* of the current tree for a creation patch in this function; the caller
* check_patch() separately makes sure (and errors out otherwise) that
* the path the patch creates does not exist in the current tree.
*/
static int check_preimage(struct patch *patch, struct cache_entry **ce, struct stat *st)
{
const char *old_name = patch->old_name;
struct patch *previous = NULL;
int stat_ret = 0, status;
unsigned st_mode = 0;
if (!old_name)
return 0;
assert(patch->is_new <= 0);
previous = previous_patch(patch, &status);
if (status)
return error(_("path %s has been renamed/deleted"), old_name);
if (previous) {
st_mode = previous->new_mode;
} else if (!cached) {
stat_ret = lstat(old_name, st);
if (stat_ret && errno != ENOENT)
return error(_("%s: %s"), old_name, strerror(errno));
}
if (check_index && !previous) {
int pos = cache_name_pos(old_name, strlen(old_name));
if (pos < 0) {
if (patch->is_new < 0)
goto is_new;
return error(_("%s: does not exist in index"), old_name);
}
*ce = active_cache[pos];
if (stat_ret < 0) {
if (checkout_target(*ce, st))
return -1;
}
if (!cached && verify_index_match(*ce, st))
return error(_("%s: does not match index"), old_name);
if (cached)
st_mode = (*ce)->ce_mode;
} else if (stat_ret < 0) {
if (patch->is_new < 0)
goto is_new;
return error(_("%s: %s"), old_name, strerror(errno));
}
if (!cached && !previous)
st_mode = ce_mode_from_stat(*ce, st->st_mode);
if (patch->is_new < 0)
patch->is_new = 0;
if (!patch->old_mode)
patch->old_mode = st_mode;
if ((st_mode ^ patch->old_mode) & S_IFMT)
return error(_("%s: wrong type"), old_name);
if (st_mode != patch->old_mode)
warning(_("%s has type %o, expected %o"),
old_name, st_mode, patch->old_mode);
if (!patch->new_mode && !patch->is_delete)
patch->new_mode = st_mode;
return 0;
is_new:
patch->is_new = 1;
patch->is_delete = 0;
free(patch->old_name);
patch->old_name = NULL;
return 0;
}
#define EXISTS_IN_INDEX 1
#define EXISTS_IN_WORKTREE 2
static int check_to_create(const char *new_name, int ok_if_exists)
{
struct stat nst;
if (check_index &&
cache_name_pos(new_name, strlen(new_name)) >= 0 &&
!ok_if_exists)
return EXISTS_IN_INDEX;
if (cached)
return 0;
if (!lstat(new_name, &nst)) {
if (S_ISDIR(nst.st_mode) || ok_if_exists)
return 0;
/*
* A leading component of new_name might be a symlink
* that is going to be removed with this patch, but
* still pointing at somewhere that has the path.
* In such a case, path "new_name" does not exist as
* far as git is concerned.
*/
if (has_symlink_leading_path(new_name, strlen(new_name)))
return 0;
return EXISTS_IN_WORKTREE;
} else if ((errno != ENOENT) && (errno != ENOTDIR)) {
return error("%s: %s", new_name, strerror(errno));
}
return 0;
}
/*
* Check and apply the patch in-core; leave the result in patch->result
* for the caller to write it out to the final destination.
*/
static int check_patch(struct patch *patch)
{
struct stat st;
const char *old_name = patch->old_name;
const char *new_name = patch->new_name;
const char *name = old_name ? old_name : new_name;
struct cache_entry *ce = NULL;
struct patch *tpatch;
int ok_if_exists;
int status;
patch->rejected = 1; /* we will drop this after we succeed */
status = check_preimage(patch, &ce, &st);
if (status)
return status;
old_name = patch->old_name;
/*
* A type-change diff is always split into a patch to delete
* old, immediately followed by a patch to create new (see
* diff.c::run_diff()); in such a case it is Ok that the entry
* to be deleted by the previous patch is still in the working
* tree and in the index.
*
* A patch to swap-rename between A and B would first rename A
* to B and then rename B to A. While applying the first one,
* the presence of B should not stop A from getting renamed to
* B; ask to_be_deleted() about the later rename. Removal of
* B and rename from A to B is handled the same way by asking
* was_deleted().
*/
if ((tpatch = in_fn_table(new_name)) &&
(was_deleted(tpatch) || to_be_deleted(tpatch)))
ok_if_exists = 1;
else
ok_if_exists = 0;
if (new_name &&
((0 < patch->is_new) || patch->is_rename || patch->is_copy)) {
int err = check_to_create(new_name, ok_if_exists);
if (err && threeway) {
patch->direct_to_threeway = 1;
} else switch (err) {
case 0:
break; /* happy */
case EXISTS_IN_INDEX:
return error(_("%s: already exists in index"), new_name);
break;
case EXISTS_IN_WORKTREE:
return error(_("%s: already exists in working directory"),
new_name);
default:
return err;
}
if (!patch->new_mode) {
if (0 < patch->is_new)
patch->new_mode = S_IFREG | 0644;
else
patch->new_mode = patch->old_mode;
}
}
if (new_name && old_name) {
int same = !strcmp(old_name, new_name);
if (!patch->new_mode)
patch->new_mode = patch->old_mode;
if ((patch->old_mode ^ patch->new_mode) & S_IFMT) {
if (same)
return error(_("new mode (%o) of %s does not "
"match old mode (%o)"),
patch->new_mode, new_name,
patch->old_mode);
else
return error(_("new mode (%o) of %s does not "
"match old mode (%o) of %s"),
patch->new_mode, new_name,
patch->old_mode, old_name);
}
}
if (apply_data(patch, &st, ce) < 0)
return error(_("%s: patch does not apply"), name);
patch->rejected = 0;
return 0;
}
static int check_patch_list(struct patch *patch)
{
int err = 0;
prepare_fn_table(patch);
while (patch) {
if (apply_verbosely)
say_patch_name(stderr,
_("Checking patch %s..."), patch);
err |= check_patch(patch);
patch = patch->next;
}
return err;
}
/* This function tries to read the sha1 from the current index */
static int get_current_sha1(const char *path, unsigned char *sha1)
{
int pos;
if (read_cache() < 0)
return -1;
pos = cache_name_pos(path, strlen(path));
if (pos < 0)
return -1;
hashcpy(sha1, active_cache[pos]->sha1);
return 0;
}
static int preimage_sha1_in_gitlink_patch(struct patch *p, unsigned char sha1[20])
{
/*
* A usable gitlink patch has only one fragment (hunk) that looks like:
* @@ -1 +1 @@
* -Subproject commit <old sha1>
* +Subproject commit <new sha1>
* or
* @@ -1 +0,0 @@
* -Subproject commit <old sha1>
* for a removal patch.
*/
struct fragment *hunk = p->fragments;
static const char heading[] = "-Subproject commit ";
char *preimage;
if (/* does the patch have only one hunk? */
hunk && !hunk->next &&
/* is its preimage one line? */
hunk->oldpos == 1 && hunk->oldlines == 1 &&
/* does preimage begin with the heading? */
(preimage = memchr(hunk->patch, '\n', hunk->size)) != NULL &&
!prefixcmp(++preimage, heading) &&
/* does it record full SHA-1? */
!get_sha1_hex(preimage + sizeof(heading) - 1, sha1) &&
preimage[sizeof(heading) + 40 - 1] == '\n' &&
/* does the abbreviated name on the index line agree with it? */
!prefixcmp(preimage + sizeof(heading) - 1, p->old_sha1_prefix))
return 0; /* it all looks fine */
/* we may have full object name on the index line */
return get_sha1_hex(p->old_sha1_prefix, sha1);
}
/* Build an index that contains the just the files needed for a 3way merge */
static void build_fake_ancestor(struct patch *list, const char *filename)
{
struct patch *patch;
struct index_state result = { NULL };
int fd;
/* Once we start supporting the reverse patch, it may be
* worth showing the new sha1 prefix, but until then...
*/
for (patch = list; patch; patch = patch->next) {
unsigned char sha1[20];
struct cache_entry *ce;
const char *name;
name = patch->old_name ? patch->old_name : patch->new_name;
if (0 < patch->is_new)
continue;
if (S_ISGITLINK(patch->old_mode)) {
if (!preimage_sha1_in_gitlink_patch(patch, sha1))
; /* ok, the textual part looks sane */
else
die("sha1 information is lacking or useless for submoule %s",
name);
} else if (!get_sha1_blob(patch->old_sha1_prefix, sha1)) {
; /* ok */
} else if (!patch->lines_added && !patch->lines_deleted) {
/* mode-only change: update the current */
if (get_current_sha1(patch->old_name, sha1))
die("mode change for %s, which is not "
"in current HEAD", name);
} else
die("sha1 information is lacking or useless "
"(%s).", name);
ce = make_cache_entry(patch->old_mode, sha1, name, 0, 0);
if (!ce)
die(_("make_cache_entry failed for path '%s'"), name);
if (add_index_entry(&result, ce, ADD_CACHE_OK_TO_ADD))
die ("Could not add %s to temporary index", name);
}
fd = open(filename, O_WRONLY | O_CREAT, 0666);
if (fd < 0 || write_index(&result, fd) || close(fd))
die ("Could not write temporary index to %s", filename);
discard_index(&result);
}
static void stat_patch_list(struct patch *patch)
{
int files, adds, dels;
for (files = adds = dels = 0 ; patch ; patch = patch->next) {
files++;
adds += patch->lines_added;
dels += patch->lines_deleted;
show_stats(patch);
}
print_stat_summary(stdout, files, adds, dels);
}
static void numstat_patch_list(struct patch *patch)
{
for ( ; patch; patch = patch->next) {
const char *name;
name = patch->new_name ? patch->new_name : patch->old_name;
if (patch->is_binary)
printf("-\t-\t");
else
printf("%d\t%d\t", patch->lines_added, patch->lines_deleted);
write_name_quoted(name, stdout, line_termination);
}
}
static void show_file_mode_name(const char *newdelete, unsigned int mode, const char *name)
{
if (mode)
printf(" %s mode %06o %s\n", newdelete, mode, name);
else
printf(" %s %s\n", newdelete, name);
}
static void show_mode_change(struct patch *p, int show_name)
{
if (p->old_mode && p->new_mode && p->old_mode != p->new_mode) {
if (show_name)
printf(" mode change %06o => %06o %s\n",
p->old_mode, p->new_mode, p->new_name);
else
printf(" mode change %06o => %06o\n",
p->old_mode, p->new_mode);
}
}
static void show_rename_copy(struct patch *p)
{
const char *renamecopy = p->is_rename ? "rename" : "copy";
const char *old, *new;
/* Find common prefix */
old = p->old_name;
new = p->new_name;
while (1) {
const char *slash_old, *slash_new;
slash_old = strchr(old, '/');
slash_new = strchr(new, '/');
if (!slash_old ||
!slash_new ||
slash_old - old != slash_new - new ||
memcmp(old, new, slash_new - new))
break;
old = slash_old + 1;
new = slash_new + 1;
}
/* p->old_name thru old is the common prefix, and old and new
* through the end of names are renames
*/
if (old != p->old_name)
printf(" %s %.*s{%s => %s} (%d%%)\n", renamecopy,
(int)(old - p->old_name), p->old_name,
old, new, p->score);
else
printf(" %s %s => %s (%d%%)\n", renamecopy,
p->old_name, p->new_name, p->score);
show_mode_change(p, 0);
}
static void summary_patch_list(struct patch *patch)
{
struct patch *p;
for (p = patch; p; p = p->next) {
if (p->is_new)
show_file_mode_name("create", p->new_mode, p->new_name);
else if (p->is_delete)
show_file_mode_name("delete", p->old_mode, p->old_name);
else {
if (p->is_rename || p->is_copy)
show_rename_copy(p);
else {
if (p->score) {
printf(" rewrite %s (%d%%)\n",
p->new_name, p->score);
show_mode_change(p, 0);
}
else
show_mode_change(p, 1);
}
}
}
}
static void patch_stats(struct patch *patch)
{
int lines = patch->lines_added + patch->lines_deleted;
if (lines > max_change)
max_change = lines;
if (patch->old_name) {
int len = quote_c_style(patch->old_name, NULL, NULL, 0);
if (!len)
len = strlen(patch->old_name);
if (len > max_len)
max_len = len;
}
if (patch->new_name) {
int len = quote_c_style(patch->new_name, NULL, NULL, 0);
if (!len)
len = strlen(patch->new_name);
if (len > max_len)
max_len = len;
}
}
static void remove_file(struct patch *patch, int rmdir_empty)
{
if (update_index) {
if (remove_file_from_cache(patch->old_name) < 0)
die(_("unable to remove %s from index"), patch->old_name);
}
if (!cached) {
if (!remove_or_warn(patch->old_mode, patch->old_name) && rmdir_empty) {
remove_path(patch->old_name);
}
}
}
static void add_index_file(const char *path, unsigned mode, void *buf, unsigned long size)
{
struct stat st;
struct cache_entry *ce;
int namelen = strlen(path);
unsigned ce_size = cache_entry_size(namelen);
if (!update_index)
return;
ce = xcalloc(1, ce_size);
memcpy(ce->name, path, namelen);
ce->ce_mode = create_ce_mode(mode);
ce->ce_flags = create_ce_flags(0);
ce->ce_namelen = namelen;
if (S_ISGITLINK(mode)) {
const char *s = buf;
if (get_sha1_hex(s + strlen("Subproject commit "), ce->sha1))
die(_("corrupt patch for subproject %s"), path);
} else {
if (!cached) {
if (lstat(path, &st) < 0)
die_errno(_("unable to stat newly created file '%s'"),
path);
fill_stat_cache_info(ce, &st);
}
if (write_sha1_file(buf, size, blob_type, ce->sha1) < 0)
die(_("unable to create backing store for newly created file %s"), path);
}
if (add_cache_entry(ce, ADD_CACHE_OK_TO_ADD) < 0)
die(_("unable to add cache entry for %s"), path);
}
static int try_create_file(const char *path, unsigned int mode, const char *buf, unsigned long size)
{
int fd;
struct strbuf nbuf = STRBUF_INIT;
if (S_ISGITLINK(mode)) {
struct stat st;
if (!lstat(path, &st) && S_ISDIR(st.st_mode))
return 0;
return mkdir(path, 0777);
}
if (has_symlinks && S_ISLNK(mode))
/* Although buf:size is counted string, it also is NUL
* terminated.
*/
return symlink(buf, path);
fd = open(path, O_CREAT | O_EXCL | O_WRONLY, (mode & 0100) ? 0777 : 0666);
if (fd < 0)
return -1;
if (convert_to_working_tree(path, buf, size, &nbuf)) {
size = nbuf.len;
buf = nbuf.buf;
}
write_or_die(fd, buf, size);
strbuf_release(&nbuf);
if (close(fd) < 0)
die_errno(_("closing file '%s'"), path);
return 0;
}
/*
* We optimistically assume that the directories exist,
* which is true 99% of the time anyway. If they don't,
* we create them and try again.
*/
static void create_one_file(char *path, unsigned mode, const char *buf, unsigned long size)
{
if (cached)
return;
if (!try_create_file(path, mode, buf, size))
return;
if (errno == ENOENT) {
if (safe_create_leading_directories(path))
return;
if (!try_create_file(path, mode, buf, size))
return;
}
if (errno == EEXIST || errno == EACCES) {
/* We may be trying to create a file where a directory
* used to be.
*/
struct stat st;
if (!lstat(path, &st) && (!S_ISDIR(st.st_mode) || !rmdir(path)))
errno = EEXIST;
}
if (errno == EEXIST) {
unsigned int nr = getpid();
for (;;) {
char newpath[PATH_MAX];
mksnpath(newpath, sizeof(newpath), "%s~%u", path, nr);
if (!try_create_file(newpath, mode, buf, size)) {
if (!rename(newpath, path))
return;
unlink_or_warn(newpath);
break;
}
if (errno != EEXIST)
break;
++nr;
}
}
die_errno(_("unable to write file '%s' mode %o"), path, mode);
}
static void add_conflicted_stages_file(struct patch *patch)
{
int stage, namelen;
unsigned ce_size, mode;
struct cache_entry *ce;
if (!update_index)
return;
namelen = strlen(patch->new_name);
ce_size = cache_entry_size(namelen);
mode = patch->new_mode ? patch->new_mode : (S_IFREG | 0644);
remove_file_from_cache(patch->new_name);
for (stage = 1; stage < 4; stage++) {
if (is_null_sha1(patch->threeway_stage[stage - 1]))
continue;
ce = xcalloc(1, ce_size);
memcpy(ce->name, patch->new_name, namelen);
ce->ce_mode = create_ce_mode(mode);
ce->ce_flags = create_ce_flags(stage);
ce->ce_namelen = namelen;
hashcpy(ce->sha1, patch->threeway_stage[stage - 1]);
if (add_cache_entry(ce, ADD_CACHE_OK_TO_ADD) < 0)
die(_("unable to add cache entry for %s"), patch->new_name);
}
}
static void create_file(struct patch *patch)
{
char *path = patch->new_name;
unsigned mode = patch->new_mode;
unsigned long size = patch->resultsize;
char *buf = patch->result;
if (!mode)
mode = S_IFREG | 0644;
create_one_file(path, mode, buf, size);
if (patch->conflicted_threeway)
add_conflicted_stages_file(patch);
else
add_index_file(path, mode, buf, size);
}
/* phase zero is to remove, phase one is to create */
static void write_out_one_result(struct patch *patch, int phase)
{
if (patch->is_delete > 0) {
if (phase == 0)
remove_file(patch, 1);
return;
}
if (patch->is_new > 0 || patch->is_copy) {
if (phase == 1)
create_file(patch);
return;
}
/*
* Rename or modification boils down to the same
* thing: remove the old, write the new
*/
if (phase == 0)
remove_file(patch, patch->is_rename);
if (phase == 1)
create_file(patch);
}
static int write_out_one_reject(struct patch *patch)
{
FILE *rej;
char namebuf[PATH_MAX];
struct fragment *frag;
int cnt = 0;
struct strbuf sb = STRBUF_INIT;
for (cnt = 0, frag = patch->fragments; frag; frag = frag->next) {
if (!frag->rejected)
continue;
cnt++;
}
if (!cnt) {
if (apply_verbosely)
say_patch_name(stderr,
_("Applied patch %s cleanly."), patch);
return 0;
}
/* This should not happen, because a removal patch that leaves
* contents are marked "rejected" at the patch level.
*/
if (!patch->new_name)
die(_("internal error"));
/* Say this even without --verbose */
strbuf_addf(&sb, Q_("Applying patch %%s with %d reject...",
"Applying patch %%s with %d rejects...",
cnt),
cnt);
say_patch_name(stderr, sb.buf, patch);
strbuf_release(&sb);
cnt = strlen(patch->new_name);
if (ARRAY_SIZE(namebuf) <= cnt + 5) {
cnt = ARRAY_SIZE(namebuf) - 5;
warning(_("truncating .rej filename to %.*s.rej"),
cnt - 1, patch->new_name);
}
memcpy(namebuf, patch->new_name, cnt);
memcpy(namebuf + cnt, ".rej", 5);
rej = fopen(namebuf, "w");
if (!rej)
return error(_("cannot open %s: %s"), namebuf, strerror(errno));
/* Normal git tools never deal with .rej, so do not pretend
* this is a git patch by saying --git nor give extended
* headers. While at it, maybe please "kompare" that wants
* the trailing TAB and some garbage at the end of line ;-).
*/
fprintf(rej, "diff a/%s b/%s\t(rejected hunks)\n",
patch->new_name, patch->new_name);
for (cnt = 1, frag = patch->fragments;
frag;
cnt++, frag = frag->next) {
if (!frag->rejected) {
fprintf_ln(stderr, _("Hunk #%d applied cleanly."), cnt);
continue;
}
fprintf_ln(stderr, _("Rejected hunk #%d."), cnt);
fprintf(rej, "%.*s", frag->size, frag->patch);
if (frag->patch[frag->size-1] != '\n')
fputc('\n', rej);
}
fclose(rej);
return -1;
}
static int write_out_results(struct patch *list)
{
int phase;
int errs = 0;
struct patch *l;
struct string_list cpath = STRING_LIST_INIT_DUP;
for (phase = 0; phase < 2; phase++) {
l = list;
while (l) {
if (l->rejected)
errs = 1;
else {
write_out_one_result(l, phase);
if (phase == 1) {
if (write_out_one_reject(l))
errs = 1;
if (l->conflicted_threeway) {
string_list_append(&cpath, l->new_name);
errs = 1;
}
}
}
l = l->next;
}
}
if (cpath.nr) {
struct string_list_item *item;
sort_string_list(&cpath);
for_each_string_list_item(item, &cpath)
fprintf(stderr, "U %s\n", item->string);
string_list_clear(&cpath, 0);
rerere(0);
}
return errs;
}
static struct lock_file lock_file;
static struct string_list limit_by_name;
static int has_include;
static void add_name_limit(const char *name, int exclude)
{
struct string_list_item *it;
it = string_list_append(&limit_by_name, name);
it->util = exclude ? NULL : (void *) 1;
}
static int use_patch(struct patch *p)
{
const char *pathname = p->new_name ? p->new_name : p->old_name;
int i;
/* Paths outside are not touched regardless of "--include" */
if (0 < prefix_length) {
int pathlen = strlen(pathname);
if (pathlen <= prefix_length ||
memcmp(prefix, pathname, prefix_length))
return 0;
}
/* See if it matches any of exclude/include rule */
for (i = 0; i < limit_by_name.nr; i++) {
struct string_list_item *it = &limit_by_name.items[i];
if (!fnmatch(it->string, pathname, 0))
return (it->util != NULL);
}
/*
* If we had any include, a path that does not match any rule is
* not used. Otherwise, we saw bunch of exclude rules (or none)
* and such a path is used.
*/
return !has_include;
}
static void prefix_one(char **name)
{
char *old_name = *name;
if (!old_name)
return;
*name = xstrdup(prefix_filename(prefix, prefix_length, *name));
free(old_name);
}
static void prefix_patches(struct patch *p)
{
if (!prefix || p->is_toplevel_relative)
return;
for ( ; p; p = p->next) {
prefix_one(&p->new_name);
prefix_one(&p->old_name);
}
}
#define INACCURATE_EOF (1<<0)
#define RECOUNT (1<<1)
static int apply_patch(int fd, const char *filename, int options)
{
size_t offset;
struct strbuf buf = STRBUF_INIT; /* owns the patch text */
struct patch *list = NULL, **listp = &list;
int skipped_patch = 0;
patch_input_file = filename;
read_patch_file(&buf, fd);
offset = 0;
while (offset < buf.len) {
struct patch *patch;
int nr;
patch = xcalloc(1, sizeof(*patch));
patch->inaccurate_eof = !!(options & INACCURATE_EOF);
patch->recount = !!(options & RECOUNT);
nr = parse_chunk(buf.buf + offset, buf.len - offset, patch);
if (nr < 0)
break;
if (apply_in_reverse)
reverse_patches(patch);
if (prefix)
prefix_patches(patch);
if (use_patch(patch)) {
patch_stats(patch);
*listp = patch;
listp = &patch->next;
}
else {
free_patch(patch);
skipped_patch++;
}
offset += nr;
}
if (!list && !skipped_patch)
die(_("unrecognized input"));
if (whitespace_error && (ws_error_action == die_on_ws_error))
apply = 0;
update_index = check_index && apply;
if (update_index && newfd < 0)
newfd = hold_locked_index(&lock_file, 1);
if (check_index) {
if (read_cache() < 0)
die(_("unable to read index file"));
}
if ((check || apply) &&
check_patch_list(list) < 0 &&
!apply_with_reject)
exit(1);
if (apply && write_out_results(list)) {
if (apply_with_reject)
exit(1);
/* with --3way, we still need to write the index out */
return 1;
}
if (fake_ancestor)
build_fake_ancestor(list, fake_ancestor);
if (diffstat)
stat_patch_list(list);
if (numstat)
numstat_patch_list(list);
if (summary)
summary_patch_list(list);
free_patch_list(list);
strbuf_release(&buf);
string_list_clear(&fn_table, 0);
return 0;
}
static int git_apply_config(const char *var, const char *value, void *cb)
{
if (!strcmp(var, "apply.whitespace"))
return git_config_string(&apply_default_whitespace, var, value);
else if (!strcmp(var, "apply.ignorewhitespace"))
return git_config_string(&apply_default_ignorewhitespace, var, value);
return git_default_config(var, value, cb);
}
static int option_parse_exclude(const struct option *opt,
const char *arg, int unset)
{
add_name_limit(arg, 1);
return 0;
}
static int option_parse_include(const struct option *opt,
const char *arg, int unset)
{
add_name_limit(arg, 0);
has_include = 1;
return 0;
}
static int option_parse_p(const struct option *opt,
const char *arg, int unset)
{
p_value = atoi(arg);
p_value_known = 1;
return 0;
}
static int option_parse_z(const struct option *opt,
const char *arg, int unset)
{
if (unset)
line_termination = '\n';
else
line_termination = 0;
return 0;
}
static int option_parse_space_change(const struct option *opt,
const char *arg, int unset)
{
if (unset)
ws_ignore_action = ignore_ws_none;
else
ws_ignore_action = ignore_ws_change;
return 0;
}
static int option_parse_whitespace(const struct option *opt,
const char *arg, int unset)
{
const char **whitespace_option = opt->value;
*whitespace_option = arg;
parse_whitespace_option(arg);
return 0;
}
static int option_parse_directory(const struct option *opt,
const char *arg, int unset)
{
root_len = strlen(arg);
if (root_len && arg[root_len - 1] != '/') {
char *new_root;
root = new_root = xmalloc(root_len + 2);
strcpy(new_root, arg);
strcpy(new_root + root_len++, "/");
} else
root = arg;
return 0;
}
int cmd_apply(int argc, const char **argv, const char *prefix_)
{
int i;
int errs = 0;
int is_not_gitdir = !startup_info->have_repository;
int force_apply = 0;
const char *whitespace_option = NULL;
struct option builtin_apply_options[] = {
{ OPTION_CALLBACK, 0, "exclude", NULL, N_("path"),
N_("don't apply changes matching the given path"),
0, option_parse_exclude },
{ OPTION_CALLBACK, 0, "include", NULL, N_("path"),
N_("apply changes matching the given path"),
0, option_parse_include },
{ OPTION_CALLBACK, 'p', NULL, NULL, N_("num"),
N_("remove <num> leading slashes from traditional diff paths"),
0, option_parse_p },
OPT_BOOLEAN(0, "no-add", &no_add,
N_("ignore additions made by the patch")),
OPT_BOOLEAN(0, "stat", &diffstat,
N_("instead of applying the patch, output diffstat for the input")),
OPT_NOOP_NOARG(0, "allow-binary-replacement"),
OPT_NOOP_NOARG(0, "binary"),
OPT_BOOLEAN(0, "numstat", &numstat,
N_("show number of added and deleted lines in decimal notation")),
OPT_BOOLEAN(0, "summary", &summary,
N_("instead of applying the patch, output a summary for the input")),
OPT_BOOLEAN(0, "check", &check,
N_("instead of applying the patch, see if the patch is applicable")),
OPT_BOOLEAN(0, "index", &check_index,
N_("make sure the patch is applicable to the current index")),
OPT_BOOLEAN(0, "cached", &cached,
N_("apply a patch without touching the working tree")),
OPT_BOOLEAN(0, "apply", &force_apply,
N_("also apply the patch (use with --stat/--summary/--check)")),
OPT_BOOL('3', "3way", &threeway,
N_( "attempt three-way merge if a patch does not apply")),
OPT_FILENAME(0, "build-fake-ancestor", &fake_ancestor,
N_("build a temporary index based on embedded index information")),
{ OPTION_CALLBACK, 'z', NULL, NULL, NULL,
N_("paths are separated with NUL character"),
PARSE_OPT_NOARG, option_parse_z },
OPT_INTEGER('C', NULL, &p_context,
N_("ensure at least <n> lines of context match")),
{ OPTION_CALLBACK, 0, "whitespace", &whitespace_option, N_("action"),
N_("detect new or modified lines that have whitespace errors"),
0, option_parse_whitespace },
{ OPTION_CALLBACK, 0, "ignore-space-change", NULL, NULL,
N_("ignore changes in whitespace when finding context"),
PARSE_OPT_NOARG, option_parse_space_change },
{ OPTION_CALLBACK, 0, "ignore-whitespace", NULL, NULL,
N_("ignore changes in whitespace when finding context"),
PARSE_OPT_NOARG, option_parse_space_change },
OPT_BOOLEAN('R', "reverse", &apply_in_reverse,
N_("apply the patch in reverse")),
OPT_BOOLEAN(0, "unidiff-zero", &unidiff_zero,
N_("don't expect at least one line of context")),
OPT_BOOLEAN(0, "reject", &apply_with_reject,
N_("leave the rejected hunks in corresponding *.rej files")),
OPT_BOOLEAN(0, "allow-overlap", &allow_overlap,
N_("allow overlapping hunks")),
OPT__VERBOSE(&apply_verbosely, N_("be verbose")),
OPT_BIT(0, "inaccurate-eof", &options,
N_("tolerate incorrectly detected missing new-line at the end of file"),
INACCURATE_EOF),
OPT_BIT(0, "recount", &options,
N_("do not trust the line counts in the hunk headers"),
RECOUNT),
{ OPTION_CALLBACK, 0, "directory", NULL, N_("root"),
N_("prepend <root> to all filenames"),
0, option_parse_directory },
OPT_END()
};
prefix = prefix_;
prefix_length = prefix ? strlen(prefix) : 0;
git_config(git_apply_config, NULL);
if (apply_default_whitespace)
parse_whitespace_option(apply_default_whitespace);
if (apply_default_ignorewhitespace)
parse_ignorewhitespace_option(apply_default_ignorewhitespace);
argc = parse_options(argc, argv, prefix, builtin_apply_options,
apply_usage, 0);
if (apply_with_reject && threeway)
die("--reject and --3way cannot be used together.");
if (cached && threeway)
die("--cached and --3way cannot be used together.");
if (threeway) {
if (is_not_gitdir)
die(_("--3way outside a repository"));
check_index = 1;
}
if (apply_with_reject)
apply = apply_verbosely = 1;
if (!force_apply && (diffstat || numstat || summary || check || fake_ancestor))
apply = 0;
if (check_index && is_not_gitdir)
die(_("--index outside a repository"));
if (cached) {
if (is_not_gitdir)
die(_("--cached outside a repository"));
check_index = 1;
}
for (i = 0; i < argc; i++) {
const char *arg = argv[i];
int fd;
if (!strcmp(arg, "-")) {
errs |= apply_patch(0, "<stdin>", options);
read_stdin = 0;
continue;
} else if (0 < prefix_length)
arg = prefix_filename(prefix, prefix_length, arg);
fd = open(arg, O_RDONLY);
if (fd < 0)
die_errno(_("can't open patch '%s'"), arg);
read_stdin = 0;
set_default_whitespace_mode(whitespace_option);
errs |= apply_patch(fd, arg, options);
close(fd);
}
set_default_whitespace_mode(whitespace_option);
if (read_stdin)
errs |= apply_patch(0, "<stdin>", options);
if (whitespace_error) {
if (squelch_whitespace_errors &&
squelch_whitespace_errors < whitespace_error) {
int squelched =
whitespace_error - squelch_whitespace_errors;
warning(Q_("squelched %d whitespace error",
"squelched %d whitespace errors",
squelched),
squelched);
}
if (ws_error_action == die_on_ws_error)
die(Q_("%d line adds whitespace errors.",
"%d lines add whitespace errors.",
whitespace_error),
whitespace_error);
if (applied_after_fixing_ws && apply)
warning("%d line%s applied after"
" fixing whitespace errors.",
applied_after_fixing_ws,
applied_after_fixing_ws == 1 ? "" : "s");
else if (whitespace_error)
warning(Q_("%d line adds whitespace errors.",
"%d lines add whitespace errors.",
whitespace_error),
whitespace_error);
}
if (update_index) {
if (write_cache(newfd, active_cache, active_nr) ||
commit_locked_index(&lock_file))
die(_("Unable to write new index file"));
}
return !!errs;
}
Reference in New Issue View Git Blame Copy Permalink