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Merge branch 'jc/cache-tree' into jc/dirwalk-n-cache-tree

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* jc/cache-tree: (24 commits)
  Fix crash when reading the empty tree
  fsck-objects: do not segfault on missing tree in cache-tree
  cache-tree: a bit more debugging support.
  read-tree: invalidate cache-tree entry when a new index entry is added.
  Fix test-dump-cache-tree in one-tree disappeared case.
  fsck-objects: mark objects reachable from cache-tree
  cache-tree: replace a sscanf() by two strtol() calls
  cache-tree.c: typefix
  test-dump-cache-tree: validate the cached data as well.
  cache_tree_update: give an option to update cache-tree only.
  read-tree: teach 1-way merege and plain read to prime cache-tree.
  read-tree: teach 1 and 2 way merges about cache-tree.
  update-index: when --unresolve, smudge the relevant cache-tree entries.
  test-dump-cache-tree: report number of subtrees.
  cache-tree: sort the subtree entries.
  Teach fsck-objects about cache-tree.
  index: make the index file format extensible.
  cache-tree: protect against "git prune".
  Add test-dump-cache-tree
  Use cache-tree in update-index.
  ...
This commit is contained in:
Junio C Hamano 2006-05-20 00:56:11 -07:00
commit 283c8eef6c
13 changed files with 830 additions and 128 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
.gitignore vendored
View File

@ -123,6 +123,7 @@ git-write-tree
git-core-*/?*
test-date
test-delta
test-dump-cache-tree
common-cmds.h
*.tar.gz
*.dsc

5
Makefile
View File

@ -208,7 +208,7 @@ DIFF_OBJS = \
diffcore-delta.o log-tree.o
LIB_OBJS = \
blob.o commit.o connect.o csum-file.o base85.o \
blob.o commit.o connect.o csum-file.o cache-tree.o base85.o \
date.o diff-delta.o entry.o exec_cmd.o ident.o index.o \
object.o pack-check.o patch-delta.o path.o pkt-line.o \
quote.o read-cache.o refs.o run-command.o \
@ -609,6 +609,9 @@ test-date$X: test-date.c date.o ctype.o
test-delta$X: test-delta.c diff-delta.o patch-delta.o
$(CC) $(ALL_CFLAGS) -o $@ $(ALL_LDFLAGS) $^
test-dump-cache-tree$X: dump-cache-tree.o $(GITLIBS)
$(CC) $(ALL_CFLAGS) -o $@ $(ALL_LDFLAGS) $(filter %.o,$^) $(LIBS)
check:
for i in *.c; do sparse $(ALL_CFLAGS) $(SPARSE_FLAGS) $$i || exit; done

5
apply.c
View File

@ -8,6 +8,7 @@
*/
#include <fnmatch.h>
#include "cache.h"
#include "cache-tree.h"
#include "quote.h"
#include "blob.h"
#include "delta.h"
@ -1917,6 +1918,7 @@ static void remove_file(struct patch *patch)
if (write_index) {
if (remove_file_from_cache(patch->old_name) < 0)
die("unable to remove %s from index", patch->old_name);
cache_tree_invalidate_path(active_cache_tree, patch->old_name);
}
if (!cached)
unlink(patch->old_name);
@ -2018,8 +2020,9 @@ static void create_file(struct patch *patch)
if (!mode)
mode = S_IFREG | 0644;
create_one_file(path, mode, buf, size);
create_one_file(path, mode, buf, size);
add_index_file(path, mode, buf, size);
cache_tree_invalidate_path(active_cache_tree, path);
}
static void write_out_one_result(struct patch *patch)

531
cache-tree.c Normal file
View File

@ -0,0 +1,531 @@
#include "cache.h"
#include "tree.h"
#include "cache-tree.h"
#define DEBUG 0
struct cache_tree *cache_tree(void)
{
struct cache_tree *it = xcalloc(1, sizeof(struct cache_tree));
it->entry_count = -1;
return it;
}
void cache_tree_free(struct cache_tree **it_p)
{
int i;
struct cache_tree *it = *it_p;
if (!it)
return;
for (i = 0; i < it->subtree_nr; i++)
if (it->down[i])
cache_tree_free(&it->down[i]->cache_tree);
free(it->down);
free(it);
*it_p = NULL;
}
static int subtree_name_cmp(const char *one, int onelen,
const char *two, int twolen)
{
if (onelen < twolen)
return -1;
if (twolen < onelen)
return 1;
return memcmp(one, two, onelen);
}
static int subtree_pos(struct cache_tree *it, const char *path, int pathlen)
{
struct cache_tree_sub **down = it->down;
int lo, hi;
lo = 0;
hi = it->subtree_nr;
while (lo < hi) {
int mi = (lo + hi) / 2;
struct cache_tree_sub *mdl = down[mi];
int cmp = subtree_name_cmp(path, pathlen,
mdl->name, mdl->namelen);
if (!cmp)
return mi;
if (cmp < 0)
hi = mi;
else
lo = mi + 1;
}
return -lo-1;
}
static struct cache_tree_sub *find_subtree(struct cache_tree *it,
const char *path,
int pathlen,
int create)
{
struct cache_tree_sub *down;
int pos = subtree_pos(it, path, pathlen);
if (0 <= pos)
return it->down[pos];
if (!create)
return NULL;
pos = -pos-1;
if (it->subtree_alloc <= it->subtree_nr) {
it->subtree_alloc = alloc_nr(it->subtree_alloc);
it->down = xrealloc(it->down, it->subtree_alloc *
sizeof(*it->down));
}
it->subtree_nr++;
down = xmalloc(sizeof(*down) + pathlen + 1);
down->cache_tree = NULL;
down->namelen = pathlen;
memcpy(down->name, path, pathlen);
down->name[pathlen] = 0;
if (pos < it->subtree_nr)
memmove(it->down + pos + 1,
it->down + pos,
sizeof(down) * (it->subtree_nr - pos - 1));
it->down[pos] = down;
return down;
}
struct cache_tree_sub *cache_tree_sub(struct cache_tree *it, const char *path)
{
int pathlen = strlen(path);
return find_subtree(it, path, pathlen, 1);
}
void cache_tree_invalidate_path(struct cache_tree *it, const char *path)
{
/* a/b/c
* ==> invalidate self
* ==> find "a", have it invalidate "b/c"
* a
* ==> invalidate self
* ==> if "a" exists as a subtree, remove it.
*/
const char *slash;
int namelen;
struct cache_tree_sub *down;
#if DEBUG
fprintf(stderr, "cache-tree invalidate <%s>\n", path);
#endif
if (!it)
return;
slash = strchr(path, '/');
it->entry_count = -1;
if (!slash) {
int pos;
namelen = strlen(path);
pos = subtree_pos(it, path, namelen);
if (0 <= pos) {
cache_tree_free(&it->down[pos]->cache_tree);
free(it->down[pos]);
/* 0 1 2 3 4 5
* ^ ^subtree_nr = 6
* pos
* move 4 and 5 up one place (2 entries)
* 2 = 6 - 3 - 1 = subtree_nr - pos - 1
*/
memmove(it->down+pos, it->down+pos+1,
sizeof(struct cache_tree_sub *) *
(it->subtree_nr - pos - 1));
it->subtree_nr--;
}
return;
}
namelen = slash - path;
down = find_subtree(it, path, namelen, 0);
if (down)
cache_tree_invalidate_path(down->cache_tree, slash + 1);
}
static int verify_cache(struct cache_entry **cache,
int entries)
{
int i, funny;
/* Verify that the tree is merged */
funny = 0;
for (i = 0; i < entries; i++) {
struct cache_entry *ce = cache[i];
if (ce_stage(ce)) {
if (10 < ++funny) {
fprintf(stderr, "...\n");
break;
}
fprintf(stderr, "%s: unmerged (%s)\n",
ce->name, sha1_to_hex(ce->sha1));
}
}
if (funny)
return -1;
/* Also verify that the cache does not have path and path/file
* at the same time. At this point we know the cache has only
* stage 0 entries.
*/
funny = 0;
for (i = 0; i < entries - 1; i++) {
/* path/file always comes after path because of the way
* the cache is sorted. Also path can appear only once,
* which means conflicting one would immediately follow.
*/
const char *this_name = cache[i]->name;
const char *next_name = cache[i+1]->name;
int this_len = strlen(this_name);
if (this_len < strlen(next_name) &&
strncmp(this_name, next_name, this_len) == 0 &&
next_name[this_len] == '/') {
if (10 < ++funny) {
fprintf(stderr, "...\n");
break;
}
fprintf(stderr, "You have both %s and %s\n",
this_name, next_name);
}
}
if (funny)
return -1;
return 0;
}
static void discard_unused_subtrees(struct cache_tree *it)
{
struct cache_tree_sub **down = it->down;
int nr = it->subtree_nr;
int dst, src;
for (dst = src = 0; src < nr; src++) {
struct cache_tree_sub *s = down[src];
if (s->used)
down[dst++] = s;
else {
cache_tree_free(&s->cache_tree);
free(s);
it->subtree_nr--;
}
}
}
int cache_tree_fully_valid(struct cache_tree *it)
{
int i;
if (!it)
return 0;
if (it->entry_count < 0 || !has_sha1_file(it->sha1))
return 0;
for (i = 0; i < it->subtree_nr; i++) {
if (!cache_tree_fully_valid(it->down[i]->cache_tree))
return 0;
}
return 1;
}
static int update_one(struct cache_tree *it,
struct cache_entry **cache,
int entries,
const char *base,
int baselen,
int missing_ok,
int dryrun)
{
unsigned long size, offset;
char *buffer;
int i;
if (0 <= it->entry_count && has_sha1_file(it->sha1))
return it->entry_count;
/*
* We first scan for subtrees and update them; we start by
* marking existing subtrees -- the ones that are unmarked
* should not be in the result.
*/
for (i = 0; i < it->subtree_nr; i++)
it->down[i]->used = 0;
/*
* Find the subtrees and update them.
*/
for (i = 0; i < entries; i++) {
struct cache_entry *ce = cache[i];
struct cache_tree_sub *sub;
const char *path, *slash;
int pathlen, sublen, subcnt;
path = ce->name;
pathlen = ce_namelen(ce);
if (pathlen <= baselen || memcmp(base, path, baselen))
break; /* at the end of this level */
slash = strchr(path + baselen, '/');
if (!slash)
continue;
/*
* a/bbb/c (base = a/, slash = /c)
* ==>
* path+baselen = bbb/c, sublen = 3
*/
sublen = slash - (path + baselen);
sub = find_subtree(it, path + baselen, sublen, 1);
if (!sub->cache_tree)
sub->cache_tree = cache_tree();
subcnt = update_one(sub->cache_tree,
cache + i, entries - i,
path,
baselen + sublen + 1,
missing_ok,
dryrun);
i += subcnt - 1;
sub->used = 1;
}
discard_unused_subtrees(it);
/*
* Then write out the tree object for this level.
*/
size = 8192;
buffer = xmalloc(size);
offset = 0;
for (i = 0; i < entries; i++) {
struct cache_entry *ce = cache[i];
struct cache_tree_sub *sub;
const char *path, *slash;
int pathlen, entlen;
const unsigned char *sha1;
unsigned mode;
path = ce->name;
pathlen = ce_namelen(ce);
if (pathlen <= baselen || memcmp(base, path, baselen))
break; /* at the end of this level */
slash = strchr(path + baselen, '/');
if (slash) {
entlen = slash - (path + baselen);
sub = find_subtree(it, path + baselen, entlen, 0);
if (!sub)
die("cache-tree.c: '%.*s' in '%s' not found",
entlen, path + baselen, path);
i += sub->cache_tree->entry_count - 1;
sha1 = sub->cache_tree->sha1;
mode = S_IFDIR;
}
else {
sha1 = ce->sha1;
mode = ntohl(ce->ce_mode);
entlen = pathlen - baselen;
}
if (!missing_ok && !has_sha1_file(sha1))
return error("invalid object %s", sha1_to_hex(sha1));
if (!ce->ce_mode)
continue; /* entry being removed */
if (size < offset + entlen + 100) {
size = alloc_nr(offset + entlen + 100);
buffer = xrealloc(buffer, size);
}
offset += sprintf(buffer + offset,
"%o %.*s", mode, entlen, path + baselen);
buffer[offset++] = 0;
memcpy(buffer + offset, sha1, 20);
offset += 20;
#if DEBUG
fprintf(stderr, "cache-tree update-one %o %.*s\n",
mode, entlen, path + baselen);
#endif
}
if (dryrun) {
unsigned char hdr[200];
int hdrlen;
write_sha1_file_prepare(buffer, offset, tree_type, it->sha1,
hdr, &hdrlen);
}
else
write_sha1_file(buffer, offset, tree_type, it->sha1);
free(buffer);
it->entry_count = i;
#if DEBUG
fprintf(stderr, "cache-tree update-one (%d ent, %d subtree) %s\n",
it->entry_count, it->subtree_nr,
sha1_to_hex(it->sha1));
#endif
return i;
}
int cache_tree_update(struct cache_tree *it,
struct cache_entry **cache,
int entries,
int missing_ok,
int dryrun)
{
int i;
i = verify_cache(cache, entries);
if (i)
return i;
i = update_one(it, cache, entries, "", 0, missing_ok, dryrun);
if (i < 0)
return i;
return 0;
}
static void *write_one(struct cache_tree *it,
char *path,
int pathlen,
char *buffer,
unsigned long *size,
unsigned long *offset)
{
int i;
/* One "cache-tree" entry consists of the following:
* path (NUL terminated)
* entry_count, subtree_nr ("%d %d\n")
* tree-sha1 (missing if invalid)
* subtree_nr "cache-tree" entries for subtrees.
*/
if (*size < *offset + pathlen + 100) {
*size = alloc_nr(*offset + pathlen + 100);
buffer = xrealloc(buffer, *size);
}
*offset += sprintf(buffer + *offset, "%.*s%c%d %d\n",
pathlen, path, 0,
it->entry_count, it->subtree_nr);
#if DEBUG
if (0 <= it->entry_count)
fprintf(stderr, "cache-tree <%.*s> (%d ent, %d subtree) %s\n",
pathlen, path, it->entry_count, it->subtree_nr,
sha1_to_hex(it->sha1));
else
fprintf(stderr, "cache-tree <%.*s> (%d subtree) invalid\n",
pathlen, path, it->subtree_nr);
#endif
if (0 <= it->entry_count) {
memcpy(buffer + *offset, it->sha1, 20);
*offset += 20;
}
for (i = 0; i < it->subtree_nr; i++) {
struct cache_tree_sub *down = it->down[i];
if (i) {
struct cache_tree_sub *prev = it->down[i-1];
if (subtree_name_cmp(down->name, down->namelen,
prev->name, prev->namelen) <= 0)
die("fatal - unsorted cache subtree");
}
buffer = write_one(down->cache_tree, down->name, down->namelen,
buffer, size, offset);
}
return buffer;
}
void *cache_tree_write(struct cache_tree *root, unsigned long *size_p)
{
char path[PATH_MAX];
unsigned long size = 8192;
char *buffer = xmalloc(size);
*size_p = 0;
path[0] = 0;
return write_one(root, path, 0, buffer, &size, size_p);
}
static struct cache_tree *read_one(const char **buffer, unsigned long *size_p)
{
const char *buf = *buffer;
unsigned long size = *size_p;
const char *cp;
char *ep;
struct cache_tree *it;
int i, subtree_nr;
it = NULL;
/* skip name, but make sure name exists */
while (size && *buf) {
size--;
buf++;
}
if (!size)
goto free_return;
buf++; size--;
it = cache_tree();
cp = buf;
it->entry_count = strtol(cp, &ep, 10);
if (cp == ep)
goto free_return;
cp = ep;
subtree_nr = strtol(cp, &ep, 10);
if (cp == ep)
goto free_return;
while (size && *buf && *buf != '\n') {
size--;
buf++;
}
if (!size)
goto free_return;
buf++; size--;
if (0 <= it->entry_count) {
if (size < 20)
goto free_return;
memcpy(it->sha1, buf, 20);
buf += 20;
size -= 20;
}
#if DEBUG
if (0 <= it->entry_count)
fprintf(stderr, "cache-tree <%s> (%d ent, %d subtree) %s\n",
*buffer, it->entry_count, subtree_nr,
sha1_to_hex(it->sha1));
else
fprintf(stderr, "cache-tree <%s> (%d subtrees) invalid\n",
*buffer, subtree_nr);
#endif
/*
* Just a heuristic -- we do not add directories that often but
* we do not want to have to extend it immediately when we do,
* hence +2.
*/
it->subtree_alloc = subtree_nr + 2;
it->down = xcalloc(it->subtree_alloc, sizeof(struct cache_tree_sub *));
for (i = 0; i < subtree_nr; i++) {
/* read each subtree */
struct cache_tree *sub;
struct cache_tree_sub *subtree;
const char *name = buf;
sub = read_one(&buf, &size);
if (!sub)
goto free_return;
subtree = cache_tree_sub(it, name);
subtree->cache_tree = sub;
}
if (subtree_nr != it->subtree_nr)
die("cache-tree: internal error");
*buffer = buf;
*size_p = size;
return it;
free_return:
cache_tree_free(&it);
return NULL;
}
struct cache_tree *cache_tree_read(const char *buffer, unsigned long size)
{
if (buffer[0])
return NULL; /* not the whole tree */
return read_one(&buffer, &size);
}

31
cache-tree.h Normal file
View File

@ -0,0 +1,31 @@
#ifndef CACHE_TREE_H
#define CACHE_TREE_H
struct cache_tree;
struct cache_tree_sub {
struct cache_tree *cache_tree;
int namelen;
int used;
char name[FLEX_ARRAY];
};
struct cache_tree {
int entry_count; /* negative means "invalid" */
unsigned char sha1[20];
int subtree_nr;
int subtree_alloc;
struct cache_tree_sub **down;
};
struct cache_tree *cache_tree(void);
void cache_tree_free(struct cache_tree **);
void cache_tree_invalidate_path(struct cache_tree *, const char *);
struct cache_tree_sub *cache_tree_sub(struct cache_tree *, const char *);
void *cache_tree_write(struct cache_tree *root, unsigned long *size_p);
struct cache_tree *cache_tree_read(const char *buffer, unsigned long size);
int cache_tree_fully_valid(struct cache_tree *);
int cache_tree_update(struct cache_tree *, struct cache_entry **, int, int, int);
#endif

1
cache.h
View File

@ -114,6 +114,7 @@ static inline unsigned int create_ce_mode(unsigned int mode)
extern struct cache_entry **active_cache;
extern unsigned int active_nr, active_alloc, active_cache_changed;
extern struct cache_tree *active_cache_tree;
#define GIT_DIR_ENVIRONMENT "GIT_DIR"
#define DEFAULT_GIT_DIR_ENVIRONMENT ".git"

1
checkout-index.c
View File

@ -39,6 +39,7 @@
#include "cache.h"
#include "strbuf.h"
#include "quote.h"
#include "cache-tree.h"
#define CHECKOUT_ALL 4
static const char *prefix;

64
dump-cache-tree.c Normal file
View File

@ -0,0 +1,64 @@
#include "cache.h"
#include "tree.h"
#include "cache-tree.h"
static void dump_one(struct cache_tree *it, const char *pfx, const char *x)
{
if (it->entry_count < 0)
printf("%-40s %s%s (%d subtrees)\n",
"invalid", x, pfx, it->subtree_nr);
else
printf("%s %s%s (%d entries, %d subtrees)\n",
sha1_to_hex(it->sha1), x, pfx,
it->entry_count, it->subtree_nr);
}
static int dump_cache_tree(struct cache_tree *it,
struct cache_tree *ref,
const char *pfx)
{
int i;
int errs = 0;
if (!it || !ref)
/* missing in either */
return 0;
if (it->entry_count < 0) {
dump_one(it, pfx, "");
dump_one(ref, pfx, "#(ref) ");
if (it->subtree_nr != ref->subtree_nr)
errs = 1;
}
else {
dump_one(it, pfx, "");
if (memcmp(it->sha1, ref->sha1, 20) ||
ref->entry_count != it->entry_count ||
ref->subtree_nr != it->subtree_nr) {
dump_one(ref, pfx, "#(ref) ");
errs = 1;
}
}
for (i = 0; i < it->subtree_nr; i++) {
char path[PATH_MAX];
struct cache_tree_sub *down = it->down[i];
struct cache_tree_sub *rdwn;
rdwn = cache_tree_sub(ref, down->name);
sprintf(path, "%s%.*s/", pfx, down->namelen, down->name);
if (dump_cache_tree(down->cache_tree, rdwn->cache_tree, path))
errs = 1;
}
return errs;
}
int main(int ac, char **av)
{
struct cache_tree *another = cache_tree();
if (read_cache() < 0)
die("unable to read index file");
cache_tree_update(another, active_cache, active_nr, 0, 1);
return dump_cache_tree(active_cache_tree, another, "");
}

25
fsck-objects.c
View File

@ -8,6 +8,7 @@
#include "tag.h"
#include "refs.h"
#include "pack.h"
#include "cache-tree.h"
#define REACHABLE 0x0001
@ -438,6 +439,28 @@ static int fsck_head_link(void)
return 0;
}
static int fsck_cache_tree(struct cache_tree *it)
{
int i;
int err = 0;
if (0 <= it->entry_count) {
struct object *obj = parse_object(it->sha1);
if (!obj) {
error("%s: invalid sha1 pointer in cache-tree",
sha1_to_hex(it->sha1));
return 1;
}
mark_reachable(obj, REACHABLE);
obj->used = 1;
if (obj->type != tree_type)
err |= objerror(obj, "non-tree in cache-tree");
}
for (i = 0; i < it->subtree_nr; i++)
err |= fsck_cache_tree(it->down[i]->cache_tree);
return err;
}
int main(int argc, char **argv)
{
int i, heads;
@ -547,6 +570,8 @@ int main(int argc, char **argv)
obj->used = 1;
mark_reachable(obj, REACHABLE);
}
if (active_cache_tree)
fsck_cache_tree(active_cache_tree);
}
check_connectivity();

72
read-cache.c
View File

@ -4,11 +4,26 @@
* Copyright (C) Linus Torvalds, 2005
*/
#include "cache.h"
#include "cache-tree.h"
/* Index extensions.
*
* The first letter should be 'A'..'Z' for extensions that are not
* necessary for a correct operation (i.e. optimization data).
* When new extensions are added that _needs_ to be understood in
* order to correctly interpret the index file, pick character that
* is outside the range, to cause the reader to abort.
*/
#define CACHE_EXT(s) ( (s[0]<<24)|(s[1]<<16)|(s[2]<<8)|(s[3]) )
#define CACHE_EXT_TREE 0x54524545 /* "TREE" */
struct cache_entry **active_cache = NULL;
static time_t index_file_timestamp;
unsigned int active_nr = 0, active_alloc = 0, active_cache_changed = 0;
struct cache_tree *active_cache_tree = NULL;
/*
* This only updates the "non-critical" parts of the directory
* cache, ie the parts that aren't tracked by GIT, and only used
@ -630,6 +645,22 @@ static int verify_hdr(struct cache_header *hdr, unsigned long size)
return 0;
}
static int read_index_extension(const char *ext, void *data, unsigned long sz)
{
switch (CACHE_EXT(ext)) {
case CACHE_EXT_TREE:
active_cache_tree = cache_tree_read(data, sz);
break;
default:
if (*ext < 'A' || 'Z' < *ext)
return error("index uses %.4s extension, which we do not understand",
ext);
fprintf(stderr, "ignoring %.4s extension\n", ext);
break;
}
return 0;
}
int read_cache(void)
{
int fd, i;
@ -678,6 +709,22 @@ int read_cache(void)
active_cache[i] = ce;
}
index_file_timestamp = st.st_mtime;
while (offset <= size - 20 - 8) {
/* After an array of active_nr index entries,
* there can be arbitrary number of extended
* sections, each of which is prefixed with
* extension name (4-byte) and section length
* in 4-byte network byte order.
*/
unsigned long extsize;
memcpy(&extsize, map + offset + 4, 4);
extsize = ntohl(extsize);
if (read_index_extension(map + offset,
map + offset + 8, extsize) < 0)
goto unmap;
offset += 8;
offset += extsize;
}
return active_nr;
unmap:
@ -712,6 +759,17 @@ static int ce_write(SHA_CTX *context, int fd, void *data, unsigned int len)
return 0;
}
static int write_index_ext_header(SHA_CTX *context, int fd,
unsigned long ext, unsigned long sz)
{
ext = htonl(ext);
sz = htonl(sz);
if ((ce_write(context, fd, &ext, 4) < 0) ||
(ce_write(context, fd, &sz, 4) < 0))
return -1;
return 0;
}
static int ce_flush(SHA_CTX *context, int fd)
{
unsigned int left = write_buffer_len;
@ -808,5 +866,19 @@ int write_cache(int newfd, struct cache_entry **cache, int entries)
if (ce_write(&c, newfd, ce, ce_size(ce)) < 0)
return -1;
}
/* Write extension data here */
if (active_cache_tree) {
unsigned long sz;
void *data = cache_tree_write(active_cache_tree, &sz);
if (data &&
!write_index_ext_header(&c, newfd, CACHE_EXT_TREE, sz) &&
!ce_write(&c, newfd, data, sz))
;
else {
free(data);
return -1;
}
}
return ce_flush(&c, newfd);
}

62
read-tree.c
View File

@ -9,6 +9,7 @@
#include "object.h"
#include "tree.h"
#include "cache-tree.h"
#include <sys/time.h>
#include <signal.h>
@ -426,6 +427,12 @@ static void verify_uptodate(struct cache_entry *ce)
die("Entry '%s' not uptodate. Cannot merge.", ce->name);
}
static void invalidate_ce_path(struct cache_entry *ce)
{
if (ce)
cache_tree_invalidate_path(active_cache_tree, ce->name);
}
/*
* We do not want to remove or overwrite a working tree file that
* is not tracked.
@ -456,10 +463,13 @@ static int merged_entry(struct cache_entry *merge, struct cache_entry *old)
*merge = *old;
} else {
verify_uptodate(old);
invalidate_ce_path(old);
}
}
else
else {
verify_absent(merge->name, "overwritten");
invalidate_ce_path(merge);
}
merge->ce_flags &= ~htons(CE_STAGEMASK);
add_cache_entry(merge, ADD_CACHE_OK_TO_ADD);
@ -474,6 +484,7 @@ static int deleted_entry(struct cache_entry *ce, struct cache_entry *old)
verify_absent(ce->name, "removed");
ce->ce_mode = 0;
add_cache_entry(ce, ADD_CACHE_OK_TO_ADD);
invalidate_ce_path(ce);
return 1;
}
@ -749,6 +760,7 @@ static int read_cache_unmerged(void)
struct cache_entry *ce = active_cache[i];
if (ce_stage(ce)) {
deleted++;
invalidate_ce_path(ce);
continue;
}
if (deleted)
@ -759,6 +771,39 @@ static int read_cache_unmerged(void)
return deleted;
}
static void prime_cache_tree_rec(struct cache_tree *it, struct tree *tree)
{
struct tree_entry_list *ent;
int cnt;
memcpy(it->sha1, tree->object.sha1, 20);
for (cnt = 0, ent = tree->entries; ent; ent = ent->next) {
if (!ent->directory)
cnt++;
else {
struct cache_tree_sub *sub;
struct tree *subtree = (struct tree *)ent->item.tree;
if (!subtree->object.parsed)
parse_tree(subtree);
sub = cache_tree_sub(it, ent->name);
sub->cache_tree = cache_tree();
prime_cache_tree_rec(sub->cache_tree, subtree);
cnt += sub->cache_tree->entry_count;
}
}
it->entry_count = cnt;
}
static void prime_cache_tree(void)
{
struct tree *tree = (struct tree *)trees->item;
if (!tree)
return;
active_cache_tree = cache_tree();
prime_cache_tree_rec(active_cache_tree, tree);
}
static const char read_tree_usage[] = "git-read-tree (<sha> | -m [--aggressive] [-u | -i] <sha1> [<sha2> [<sha3>]])";
static struct cache_file cache_file;
@ -860,10 +905,9 @@ int main(int argc, char **argv)
fn = twoway_merge;
break;
case 3:
fn = threeway_merge;
break;
default:
fn = threeway_merge;
cache_tree_free(&active_cache_tree);
break;
}
@ -874,6 +918,18 @@ int main(int argc, char **argv)
}
unpack_trees(fn);
/*
* When reading only one tree (either the most basic form,
* "-m ent" or "--reset ent" form), we can obtain a fully
* valid cache-tree because the index must match exactly
* what came from the tree.
*/
if (trees && trees->item && (!merge || (stage == 2))) {
cache_tree_free(&active_cache_tree);
prime_cache_tree();
}
if (write_cache(newfd, active_cache, active_nr) ||
commit_index_file(&cache_file))
die("unable to write new index file");

13
update-index.c
View File

@ -6,6 +6,7 @@
#include "cache.h"
#include "strbuf.h"
#include "quote.h"
#include "cache-tree.h"
#include "tree-walk.h"
/*
@ -51,6 +52,7 @@ static int mark_valid(const char *path)
active_cache[pos]->ce_flags &= ~htons(CE_VALID);
break;
}
cache_tree_invalidate_path(active_cache_tree, path);
active_cache_changed = 1;
return 0;
}
@ -64,6 +66,12 @@ static int add_file_to_cache(const char *path)
struct stat st;
status = lstat(path, &st);
/* We probably want to do this in remove_file_from_cache() and
* add_cache_entry() instead...
*/
cache_tree_invalidate_path(active_cache_tree, path);
if (status < 0 || S_ISDIR(st.st_mode)) {
/* When we used to have "path" and now we want to add
* "path/file", we need a way to remove "path" before
@ -209,6 +217,7 @@ static int add_cacheinfo(unsigned int mode, const unsigned char *sha1,
return error("%s: cannot add to the index - missing --add option?",
path);
report("add '%s'", path);
cache_tree_invalidate_path(active_cache_tree, path);
return 0;
}
@ -233,6 +242,7 @@ static void chmod_path(int flip, const char *path)
default:
goto fail;
}
cache_tree_invalidate_path(active_cache_tree, path);
active_cache_changed = 1;
report("chmod %cx '%s'", flip, path);
return;
@ -254,6 +264,7 @@ static void update_one(const char *path, const char *prefix, int prefix_length)
die("Unable to mark file %s", path);
goto free_return;
}
cache_tree_invalidate_path(active_cache_tree, path);
if (force_remove) {
if (remove_file_from_cache(p))
@ -332,6 +343,7 @@ static void read_index_info(int line_termination)
free(path_name);
continue;
}
cache_tree_invalidate_path(active_cache_tree, path_name);
if (!mode) {
/* mode == 0 means there is no such path -- remove */
@ -438,6 +450,7 @@ static int unresolve_one(const char *path)
goto free_return;
}
cache_tree_invalidate_path(active_cache_tree, path);
remove_file_from_cache(path);
if (add_cache_entry(ce_2, ADD_CACHE_OK_TO_ADD)) {
error("%s: cannot add our version to the index.", path);

147
write-tree.c
View File

@ -5,95 +5,21 @@
*/
#include "cache.h"
#include "tree.h"
#include "cache-tree.h"
static int missing_ok = 0;
static int check_valid_sha1(unsigned char *sha1)
{
int ret;
/* If we were anal, we'd check that the sha1 of the contents actually matches */
ret = has_sha1_file(sha1);
if (ret == 0)
perror(sha1_file_name(sha1));
return ret ? 0 : -1;
}
static int write_tree(struct cache_entry **cachep, int maxentries, const char *base, int baselen, unsigned char *returnsha1)
{
unsigned char subdir_sha1[20];
unsigned long size, offset;
char *buffer;
int nr;
/* Guess at some random initial size */
size = 8192;
buffer = xmalloc(size);
offset = 0;
nr = 0;
while (nr < maxentries) {
struct cache_entry *ce = cachep[nr];
const char *pathname = ce->name, *filename, *dirname;
int pathlen = ce_namelen(ce), entrylen;
unsigned char *sha1;
unsigned int mode;
/* Did we hit the end of the directory? Return how many we wrote */
if (baselen >= pathlen || memcmp(base, pathname, baselen))
break;
sha1 = ce->sha1;
mode = ntohl(ce->ce_mode);
/* Do we have _further_ subdirectories? */
filename = pathname + baselen;
dirname = strchr(filename, '/');
if (dirname) {
int subdir_written;
subdir_written = write_tree(cachep + nr, maxentries - nr, pathname, dirname-pathname+1, subdir_sha1);
nr += subdir_written;
/* Now we need to write out the directory entry into this tree.. */
mode = S_IFDIR;
pathlen = dirname - pathname;
/* ..but the directory entry doesn't count towards the total count */
nr--;
sha1 = subdir_sha1;
}
if (!missing_ok && check_valid_sha1(sha1) < 0)
exit(1);
entrylen = pathlen - baselen;
if (offset + entrylen + 100 > size) {
size = alloc_nr(offset + entrylen + 100);
buffer = xrealloc(buffer, size);
}
offset += sprintf(buffer + offset, "%o %.*s", mode, entrylen, filename);
buffer[offset++] = 0;
memcpy(buffer + offset, sha1, 20);
offset += 20;
nr++;
}
write_sha1_file(buffer, offset, tree_type, returnsha1);
free(buffer);
return nr;
}
static const char write_tree_usage[] = "git-write-tree [--missing-ok]";
static struct cache_file cache_file;
int main(int argc, char **argv)
{
int i, funny;
int entries;
unsigned char sha1[20];
int entries, was_valid, newfd;
setup_git_directory();
newfd = hold_index_file_for_update(&cache_file, get_index_file());
entries = read_cache();
if (argc == 2) {
if (!strcmp(argv[1], "--missing-ok"))
@ -108,51 +34,26 @@ int main(int argc, char **argv)
if (entries < 0)
die("git-write-tree: error reading cache");
/* Verify that the tree is merged */
funny = 0;
for (i = 0; i < entries; i++) {
struct cache_entry *ce = active_cache[i];
if (ce_stage(ce)) {
if (10 < ++funny) {
fprintf(stderr, "...\n");
break;
}
fprintf(stderr, "%s: unmerged (%s)\n", ce->name, sha1_to_hex(ce->sha1));
}
}
if (funny)
die("git-write-tree: not able to write tree");
if (!active_cache_tree)
active_cache_tree = cache_tree();
/* Also verify that the cache does not have path and path/file
* at the same time. At this point we know the cache has only
* stage 0 entries.
*/
funny = 0;
for (i = 0; i < entries - 1; i++) {
/* path/file always comes after path because of the way
* the cache is sorted. Also path can appear only once,
* which means conflicting one would immediately follow.
was_valid = cache_tree_fully_valid(active_cache_tree);
if (!was_valid) {
if (cache_tree_update(active_cache_tree,
active_cache, active_nr,
missing_ok, 0) < 0)
die("git-write-tree: error building trees");
if (0 <= newfd) {
if (!write_cache(newfd, active_cache, active_nr))
commit_index_file(&cache_file);
}
/* Not being able to write is fine -- we are only interested
* in updating the cache-tree part, and if the next caller
* ends up using the old index with unupdated cache-tree part
* it misses the work we did here, but that is just a
* performance penalty and not a big deal.
*/
const char *this_name = active_cache[i]->name;
const char *next_name = active_cache[i+1]->name;
int this_len = strlen(this_name);
if (this_len < strlen(next_name) &&
strncmp(this_name, next_name, this_len) == 0 &&
next_name[this_len] == '/') {
if (10 < ++funny) {
fprintf(stderr, "...\n");
break;
}
fprintf(stderr, "You have both %s and %s\n",
this_name, next_name);
}
}
if (funny)
die("git-write-tree: not able to write tree");
/* Ok, write it out */
if (write_tree(active_cache, entries, "", 0, sha1) != entries)
die("git-write-tree: internal error");
printf("%s\n", sha1_to_hex(sha1));
printf("%s\n", sha1_to_hex(active_cache_tree->sha1));
return 0;
}