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643c6f576c
git/read-cache.c
Patrick Steinhardt d1c53f6703 read-cache: fix leaking hashfile when writing index fails 
In `do_write_index()`, we use a `struct hashfile` to write the index
with a trailer hash. In case the write fails though, we never clean up
the allocated `hashfile` state and thus leak memory.

Refactor the code to have a common exit path where we can free this and
other allocated memory. While at it, refactor our use of `strbuf`s such
that we reuse the same buffer to avoid some unneeded allocations.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2024-08-14 10:07:58 -07:00

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/*
* GIT - The information manager from hell
*
* Copyright (C) Linus Torvalds, 2005
*/
#define USE_THE_REPOSITORY_VARIABLE
#include "git-compat-util.h"
#include "bulk-checkin.h"
#include "config.h"
#include "date.h"
#include "diff.h"
#include "diffcore.h"
#include "hex.h"
#include "tempfile.h"
#include "lockfile.h"
#include "cache-tree.h"
#include "refs.h"
#include "dir.h"
#include "object-file.h"
#include "object-store-ll.h"
#include "oid-array.h"
#include "tree.h"
#include "commit.h"
#include "environment.h"
#include "gettext.h"
#include "mem-pool.h"
#include "name-hash.h"
#include "object-name.h"
#include "path.h"
#include "preload-index.h"
#include "read-cache.h"
#include "resolve-undo.h"
#include "revision.h"
#include "strbuf.h"
#include "trace2.h"
#include "varint.h"
#include "split-index.h"
#include "symlinks.h"
#include "utf8.h"
#include "fsmonitor.h"
#include "thread-utils.h"
#include "progress.h"
#include "sparse-index.h"
#include "csum-file.h"
#include "promisor-remote.h"
#include "hook.h"
/* Mask for the name length in ce_flags in the on-disk index */
#define CE_NAMEMASK (0x0fff)
/* 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" */
#define CACHE_EXT_RESOLVE_UNDO 0x52455543 /* "REUC" */
#define CACHE_EXT_LINK 0x6c696e6b /* "link" */
#define CACHE_EXT_UNTRACKED 0x554E5452 /* "UNTR" */
#define CACHE_EXT_FSMONITOR 0x46534D4E /* "FSMN" */
#define CACHE_EXT_ENDOFINDEXENTRIES 0x454F4945 /* "EOIE" */
#define CACHE_EXT_INDEXENTRYOFFSETTABLE 0x49454F54 /* "IEOT" */
#define CACHE_EXT_SPARSE_DIRECTORIES 0x73646972 /* "sdir" */
/* changes that can be kept in $GIT_DIR/index (basically all extensions) */
#define EXTMASK (RESOLVE_UNDO_CHANGED | CACHE_TREE_CHANGED | \
CE_ENTRY_ADDED | CE_ENTRY_REMOVED | CE_ENTRY_CHANGED | \
SPLIT_INDEX_ORDERED | UNTRACKED_CHANGED | FSMONITOR_CHANGED)
/*
* This is an estimate of the pathname length in the index. We use
* this for V4 index files to guess the un-deltafied size of the index
* in memory because of pathname deltafication. This is not required
* for V2/V3 index formats because their pathnames are not compressed.
* If the initial amount of memory set aside is not sufficient, the
* mem pool will allocate extra memory.
*/
#define CACHE_ENTRY_PATH_LENGTH 80
enum index_search_mode {
NO_EXPAND_SPARSE = 0,
EXPAND_SPARSE = 1
};
static inline struct cache_entry *mem_pool__ce_alloc(struct mem_pool *mem_pool, size_t len)
{
struct cache_entry *ce;
ce = mem_pool_alloc(mem_pool, cache_entry_size(len));
ce->mem_pool_allocated = 1;
return ce;
}
static inline struct cache_entry *mem_pool__ce_calloc(struct mem_pool *mem_pool, size_t len)
{
struct cache_entry * ce;
ce = mem_pool_calloc(mem_pool, 1, cache_entry_size(len));
ce->mem_pool_allocated = 1;
return ce;
}
static struct mem_pool *find_mem_pool(struct index_state *istate)
{
struct mem_pool **pool_ptr;
if (istate->split_index && istate->split_index->base)
pool_ptr = &istate->split_index->base->ce_mem_pool;
else
pool_ptr = &istate->ce_mem_pool;
if (!*pool_ptr) {
*pool_ptr = xmalloc(sizeof(**pool_ptr));
mem_pool_init(*pool_ptr, 0);
}
return *pool_ptr;
}
static const char *alternate_index_output;
static void set_index_entry(struct index_state *istate, int nr, struct cache_entry *ce)
{
if (S_ISSPARSEDIR(ce->ce_mode))
istate->sparse_index = INDEX_COLLAPSED;
istate->cache[nr] = ce;
add_name_hash(istate, ce);
}
static void replace_index_entry(struct index_state *istate, int nr, struct cache_entry *ce)
{
struct cache_entry *old = istate->cache[nr];
replace_index_entry_in_base(istate, old, ce);
remove_name_hash(istate, old);
discard_cache_entry(old);
ce->ce_flags &= ~CE_HASHED;
set_index_entry(istate, nr, ce);
ce->ce_flags |= CE_UPDATE_IN_BASE;
mark_fsmonitor_invalid(istate, ce);
istate->cache_changed |= CE_ENTRY_CHANGED;
}
void rename_index_entry_at(struct index_state *istate, int nr, const char *new_name)
{
struct cache_entry *old_entry = istate->cache[nr], *new_entry, *refreshed;
int namelen = strlen(new_name);
new_entry = make_empty_cache_entry(istate, namelen);
copy_cache_entry(new_entry, old_entry);
new_entry->ce_flags &= ~CE_HASHED;
new_entry->ce_namelen = namelen;
new_entry->index = 0;
memcpy(new_entry->name, new_name, namelen + 1);
cache_tree_invalidate_path(istate, old_entry->name);
untracked_cache_remove_from_index(istate, old_entry->name);
remove_index_entry_at(istate, nr);
/*
* Refresh the new index entry. Using 'refresh_cache_entry' ensures
* we only update stat info if the entry is otherwise up-to-date (i.e.,
* the contents/mode haven't changed). This ensures that we reflect the
* 'ctime' of the rename in the index without (incorrectly) updating
* the cached stat info to reflect unstaged changes on disk.
*/
refreshed = refresh_cache_entry(istate, new_entry, CE_MATCH_REFRESH);
if (refreshed && refreshed != new_entry) {
add_index_entry(istate, refreshed, ADD_CACHE_OK_TO_ADD|ADD_CACHE_OK_TO_REPLACE);
discard_cache_entry(new_entry);
} else
add_index_entry(istate, new_entry, ADD_CACHE_OK_TO_ADD|ADD_CACHE_OK_TO_REPLACE);
}
/*
* This only updates the "non-critical" parts of the directory
* cache, ie the parts that aren't tracked by GIT, and only used
* to validate the cache.
*/
void fill_stat_cache_info(struct index_state *istate, struct cache_entry *ce, struct stat *st)
{
fill_stat_data(&ce->ce_stat_data, st);
if (assume_unchanged)
ce->ce_flags |= CE_VALID;
if (S_ISREG(st->st_mode)) {
ce_mark_uptodate(ce);
mark_fsmonitor_valid(istate, ce);
}
}
static unsigned int st_mode_from_ce(const struct cache_entry *ce)
{
extern int trust_executable_bit, has_symlinks;
switch (ce->ce_mode & S_IFMT) {
case S_IFLNK:
return has_symlinks ? S_IFLNK : (S_IFREG | 0644);
case S_IFREG:
return (ce->ce_mode & (trust_executable_bit ? 0755 : 0644)) | S_IFREG;
case S_IFGITLINK:
return S_IFDIR | 0755;
case S_IFDIR:
return ce->ce_mode;
default:
BUG("unsupported ce_mode: %o", ce->ce_mode);
}
}
int fake_lstat(const struct cache_entry *ce, struct stat *st)
{
fake_lstat_data(&ce->ce_stat_data, st);
st->st_mode = st_mode_from_ce(ce);
/* always succeed as lstat() replacement */
return 0;
}
static int ce_compare_data(struct index_state *istate,
const struct cache_entry *ce,
struct stat *st)
{
int match = -1;
int fd = git_open_cloexec(ce->name, O_RDONLY);
if (fd >= 0) {
struct object_id oid;
if (!index_fd(istate, &oid, fd, st, OBJ_BLOB, ce->name, 0))
match = !oideq(&oid, &ce->oid);
/* index_fd() closed the file descriptor already */
}
return match;
}
static int ce_compare_link(const struct cache_entry *ce, size_t expected_size)
{
int match = -1;
void *buffer;
unsigned long size;
enum object_type type;
struct strbuf sb = STRBUF_INIT;
if (strbuf_readlink(&sb, ce->name, expected_size))
return -1;
buffer = repo_read_object_file(the_repository, &ce->oid, &type, &size);
if (buffer) {
if (size == sb.len)
match = memcmp(buffer, sb.buf, size);
free(buffer);
}
strbuf_release(&sb);
return match;
}
static int ce_compare_gitlink(const struct cache_entry *ce)
{
struct object_id oid;
/*
* We don't actually require that the .git directory
* under GITLINK directory be a valid git directory. It
* might even be missing (in case nobody populated that
* sub-project).
*
* If so, we consider it always to match.
*/
if (repo_resolve_gitlink_ref(the_repository, ce->name,
"HEAD", &oid) < 0)
return 0;
return !oideq(&oid, &ce->oid);
}
static int ce_modified_check_fs(struct index_state *istate,
const struct cache_entry *ce,
struct stat *st)
{
switch (st->st_mode & S_IFMT) {
case S_IFREG:
if (ce_compare_data(istate, ce, st))
return DATA_CHANGED;
break;
case S_IFLNK:
if (ce_compare_link(ce, xsize_t(st->st_size)))
return DATA_CHANGED;
break;
case S_IFDIR:
if (S_ISGITLINK(ce->ce_mode))
return ce_compare_gitlink(ce) ? DATA_CHANGED : 0;
/* else fallthrough */
default:
return TYPE_CHANGED;
}
return 0;
}
static int ce_match_stat_basic(const struct cache_entry *ce, struct stat *st)
{
unsigned int changed = 0;
if (ce->ce_flags & CE_REMOVE)
return MODE_CHANGED | DATA_CHANGED | TYPE_CHANGED;
switch (ce->ce_mode & S_IFMT) {
case S_IFREG:
changed |= !S_ISREG(st->st_mode) ? TYPE_CHANGED : 0;
/* We consider only the owner x bit to be relevant for
* "mode changes"
*/
if (trust_executable_bit &&
(0100 & (ce->ce_mode ^ st->st_mode)))
changed |= MODE_CHANGED;
break;
case S_IFLNK:
if (!S_ISLNK(st->st_mode) &&
(has_symlinks || !S_ISREG(st->st_mode)))
changed |= TYPE_CHANGED;
break;
case S_IFGITLINK:
/* We ignore most of the st_xxx fields for gitlinks */
if (!S_ISDIR(st->st_mode))
changed |= TYPE_CHANGED;
else if (ce_compare_gitlink(ce))
changed |= DATA_CHANGED;
return changed;
default:
BUG("unsupported ce_mode: %o", ce->ce_mode);
}
changed |= match_stat_data(&ce->ce_stat_data, st);
/* Racily smudged entry? */
if (!ce->ce_stat_data.sd_size) {
if (!is_empty_blob_oid(&ce->oid, the_repository->hash_algo))
changed |= DATA_CHANGED;
}
return changed;
}
static int is_racy_stat(const struct index_state *istate,
const struct stat_data *sd)
{
return (istate->timestamp.sec &&
#ifdef USE_NSEC
/* nanosecond timestamped files can also be racy! */
(istate->timestamp.sec < sd->sd_mtime.sec ||
(istate->timestamp.sec == sd->sd_mtime.sec &&
istate->timestamp.nsec <= sd->sd_mtime.nsec))
#else
istate->timestamp.sec <= sd->sd_mtime.sec
#endif
);
}
int is_racy_timestamp(const struct index_state *istate,
const struct cache_entry *ce)
{
return (!S_ISGITLINK(ce->ce_mode) &&
is_racy_stat(istate, &ce->ce_stat_data));
}
int match_stat_data_racy(const struct index_state *istate,
const struct stat_data *sd, struct stat *st)
{
if (is_racy_stat(istate, sd))
return MTIME_CHANGED;
return match_stat_data(sd, st);
}
int ie_match_stat(struct index_state *istate,
const struct cache_entry *ce, struct stat *st,
unsigned int options)
{
unsigned int changed;
int ignore_valid = options & CE_MATCH_IGNORE_VALID;
int ignore_skip_worktree = options & CE_MATCH_IGNORE_SKIP_WORKTREE;
int assume_racy_is_modified = options & CE_MATCH_RACY_IS_DIRTY;
int ignore_fsmonitor = options & CE_MATCH_IGNORE_FSMONITOR;
if (!ignore_fsmonitor)
refresh_fsmonitor(istate);
/*
* If it's marked as always valid in the index, it's
* valid whatever the checked-out copy says.
*
* skip-worktree has the same effect with higher precedence
*/
if (!ignore_skip_worktree && ce_skip_worktree(ce))
return 0;
if (!ignore_valid && (ce->ce_flags & CE_VALID))
return 0;
if (!ignore_fsmonitor && (ce->ce_flags & CE_FSMONITOR_VALID))
return 0;
/*
* Intent-to-add entries have not been added, so the index entry
* by definition never matches what is in the work tree until it
* actually gets added.
*/
if (ce_intent_to_add(ce))
return DATA_CHANGED | TYPE_CHANGED | MODE_CHANGED;
changed = ce_match_stat_basic(ce, st);
/*
* Within 1 second of this sequence:
* echo xyzzy >file && git-update-index --add file
* running this command:
* echo frotz >file
* would give a falsely clean cache entry. The mtime and
* length match the cache, and other stat fields do not change.
*
* We could detect this at update-index time (the cache entry
* being registered/updated records the same time as "now")
* and delay the return from git-update-index, but that would
* effectively mean we can make at most one commit per second,
* which is not acceptable. Instead, we check cache entries
* whose mtime are the same as the index file timestamp more
* carefully than others.
*/
if (!changed && is_racy_timestamp(istate, ce)) {
if (assume_racy_is_modified)
changed |= DATA_CHANGED;
else
changed |= ce_modified_check_fs(istate, ce, st);
}
return changed;
}
int ie_modified(struct index_state *istate,
const struct cache_entry *ce,
struct stat *st, unsigned int options)
{
int changed, changed_fs;
changed = ie_match_stat(istate, ce, st, options);
if (!changed)
return 0;
/*
* If the mode or type has changed, there's no point in trying
* to refresh the entry - it's not going to match
*/
if (changed & (MODE_CHANGED | TYPE_CHANGED))
return changed;
/*
* Immediately after read-tree or update-index --cacheinfo,
* the length field is zero, as we have never even read the
* lstat(2) information once, and we cannot trust DATA_CHANGED
* returned by ie_match_stat() which in turn was returned by
* ce_match_stat_basic() to signal that the filesize of the
* blob changed. We have to actually go to the filesystem to
* see if the contents match, and if so, should answer "unchanged".
*
* The logic does not apply to gitlinks, as ce_match_stat_basic()
* already has checked the actual HEAD from the filesystem in the
* subproject. If ie_match_stat() already said it is different,
* then we know it is.
*/
if ((changed & DATA_CHANGED) &&
(S_ISGITLINK(ce->ce_mode) || ce->ce_stat_data.sd_size != 0))
return changed;
changed_fs = ce_modified_check_fs(istate, ce, st);
if (changed_fs)
return changed | changed_fs;
return 0;
}
static int cache_name_stage_compare(const char *name1, int len1, int stage1,
const char *name2, int len2, int stage2)
{
int cmp;
cmp = name_compare(name1, len1, name2, len2);
if (cmp)
return cmp;
if (stage1 < stage2)
return -1;
if (stage1 > stage2)
return 1;
return 0;
}
int cmp_cache_name_compare(const void *a_, const void *b_)
{
const struct cache_entry *ce1, *ce2;
ce1 = *((const struct cache_entry **)a_);
ce2 = *((const struct cache_entry **)b_);
return cache_name_stage_compare(ce1->name, ce1->ce_namelen, ce_stage(ce1),
ce2->name, ce2->ce_namelen, ce_stage(ce2));
}
static int index_name_stage_pos(struct index_state *istate,
const char *name, int namelen,
int stage,
enum index_search_mode search_mode)
{
int first, last;
first = 0;
last = istate->cache_nr;
while (last > first) {
int next = first + ((last - first) >> 1);
struct cache_entry *ce = istate->cache[next];
int cmp = cache_name_stage_compare(name, namelen, stage, ce->name, ce_namelen(ce), ce_stage(ce));
if (!cmp)
return next;
if (cmp < 0) {
last = next;
continue;
}
first = next+1;
}
if (search_mode == EXPAND_SPARSE && istate->sparse_index &&
first > 0) {
/* Note: first <= istate->cache_nr */
struct cache_entry *ce = istate->cache[first - 1];
/*
* If we are in a sparse-index _and_ the entry before the
* insertion position is a sparse-directory entry that is
* an ancestor of 'name', then we need to expand the index
* and search again. This will only trigger once, because
* thereafter the index is fully expanded.
*/
if (S_ISSPARSEDIR(ce->ce_mode) &&
ce_namelen(ce) < namelen &&
!strncmp(name, ce->name, ce_namelen(ce))) {
ensure_full_index(istate);
return index_name_stage_pos(istate, name, namelen, stage, search_mode);
}
}
return -first-1;
}
int index_name_pos(struct index_state *istate, const char *name, int namelen)
{
return index_name_stage_pos(istate, name, namelen, 0, EXPAND_SPARSE);
}
int index_name_pos_sparse(struct index_state *istate, const char *name, int namelen)
{
return index_name_stage_pos(istate, name, namelen, 0, NO_EXPAND_SPARSE);
}
int index_entry_exists(struct index_state *istate, const char *name, int namelen)
{
return index_name_stage_pos(istate, name, namelen, 0, NO_EXPAND_SPARSE) >= 0;
}
int remove_index_entry_at(struct index_state *istate, int pos)
{
struct cache_entry *ce = istate->cache[pos];
record_resolve_undo(istate, ce);
remove_name_hash(istate, ce);
save_or_free_index_entry(istate, ce);
istate->cache_changed |= CE_ENTRY_REMOVED;
istate->cache_nr--;
if (pos >= istate->cache_nr)
return 0;
MOVE_ARRAY(istate->cache + pos, istate->cache + pos + 1,
istate->cache_nr - pos);
return 1;
}
/*
* Remove all cache entries marked for removal, that is where
* CE_REMOVE is set in ce_flags. This is much more effective than
* calling remove_index_entry_at() for each entry to be removed.
*/
void remove_marked_cache_entries(struct index_state *istate, int invalidate)
{
struct cache_entry **ce_array = istate->cache;
unsigned int i, j;
for (i = j = 0; i < istate->cache_nr; i++) {
if (ce_array[i]->ce_flags & CE_REMOVE) {
if (invalidate) {
cache_tree_invalidate_path(istate,
ce_array[i]->name);
untracked_cache_remove_from_index(istate,
ce_array[i]->name);
}
remove_name_hash(istate, ce_array[i]);
save_or_free_index_entry(istate, ce_array[i]);
}
else
ce_array[j++] = ce_array[i];
}
if (j == istate->cache_nr)
return;
istate->cache_changed |= CE_ENTRY_REMOVED;
istate->cache_nr = j;
}
int remove_file_from_index(struct index_state *istate, const char *path)
{
int pos = index_name_pos(istate, path, strlen(path));
if (pos < 0)
pos = -pos-1;
cache_tree_invalidate_path(istate, path);
untracked_cache_remove_from_index(istate, path);
while (pos < istate->cache_nr && !strcmp(istate->cache[pos]->name, path))
remove_index_entry_at(istate, pos);
return 0;
}
static int compare_name(struct cache_entry *ce, const char *path, int namelen)
{
return namelen != ce_namelen(ce) || memcmp(path, ce->name, namelen);
}
static int index_name_pos_also_unmerged(struct index_state *istate,
const char *path, int namelen)
{
int pos = index_name_pos(istate, path, namelen);
struct cache_entry *ce;
if (pos >= 0)
return pos;
/* maybe unmerged? */
pos = -1 - pos;
if (pos >= istate->cache_nr ||
compare_name((ce = istate->cache[pos]), path, namelen))
return -1;
/* order of preference: stage 2, 1, 3 */
if (ce_stage(ce) == 1 && pos + 1 < istate->cache_nr &&
ce_stage((ce = istate->cache[pos + 1])) == 2 &&
!compare_name(ce, path, namelen))
pos++;
return pos;
}
static int different_name(struct cache_entry *ce, struct cache_entry *alias)
{
int len = ce_namelen(ce);
return ce_namelen(alias) != len || memcmp(ce->name, alias->name, len);
}
/*
* If we add a filename that aliases in the cache, we will use the
* name that we already have - but we don't want to update the same
* alias twice, because that implies that there were actually two
* different files with aliasing names!
*
* So we use the CE_ADDED flag to verify that the alias was an old
* one before we accept it as
*/
static struct cache_entry *create_alias_ce(struct index_state *istate,
struct cache_entry *ce,
struct cache_entry *alias)
{
int len;
struct cache_entry *new_entry;
if (alias->ce_flags & CE_ADDED)
die(_("will not add file alias '%s' ('%s' already exists in index)"),
ce->name, alias->name);
/* Ok, create the new entry using the name of the existing alias */
len = ce_namelen(alias);
new_entry = make_empty_cache_entry(istate, len);
memcpy(new_entry->name, alias->name, len);
copy_cache_entry(new_entry, ce);
save_or_free_index_entry(istate, ce);
return new_entry;
}
void set_object_name_for_intent_to_add_entry(struct cache_entry *ce)
{
struct object_id oid;
if (write_object_file("", 0, OBJ_BLOB, &oid))
die(_("cannot create an empty blob in the object database"));
oidcpy(&ce->oid, &oid);
}
int add_to_index(struct index_state *istate, const char *path, struct stat *st, int flags)
{
int namelen, was_same;
mode_t st_mode = st->st_mode;
struct cache_entry *ce, *alias = NULL;
unsigned ce_option = CE_MATCH_IGNORE_VALID|CE_MATCH_IGNORE_SKIP_WORKTREE|CE_MATCH_RACY_IS_DIRTY;
int verbose = flags & (ADD_CACHE_VERBOSE | ADD_CACHE_PRETEND);
int pretend = flags & ADD_CACHE_PRETEND;
int intent_only = flags & ADD_CACHE_INTENT;
int add_option = (ADD_CACHE_OK_TO_ADD|ADD_CACHE_OK_TO_REPLACE|
(intent_only ? ADD_CACHE_NEW_ONLY : 0));
unsigned hash_flags = pretend ? 0 : HASH_WRITE_OBJECT;
struct object_id oid;
if (flags & ADD_CACHE_RENORMALIZE)
hash_flags |= HASH_RENORMALIZE;
if (!S_ISREG(st_mode) && !S_ISLNK(st_mode) && !S_ISDIR(st_mode))
return error(_("%s: can only add regular files, symbolic links or git-directories"), path);
namelen = strlen(path);
if (S_ISDIR(st_mode)) {
if (repo_resolve_gitlink_ref(the_repository, path, "HEAD", &oid) < 0)
return error(_("'%s' does not have a commit checked out"), path);
while (namelen && path[namelen-1] == '/')
namelen--;
}
ce = make_empty_cache_entry(istate, namelen);
memcpy(ce->name, path, namelen);
ce->ce_namelen = namelen;
if (!intent_only)
fill_stat_cache_info(istate, ce, st);
else
ce->ce_flags |= CE_INTENT_TO_ADD;
if (trust_executable_bit && has_symlinks) {
ce->ce_mode = create_ce_mode(st_mode);
} else {
/* If there is an existing entry, pick the mode bits and type
* from it, otherwise assume unexecutable regular file.
*/
struct cache_entry *ent;
int pos = index_name_pos_also_unmerged(istate, path, namelen);
ent = (0 <= pos) ? istate->cache[pos] : NULL;
ce->ce_mode = ce_mode_from_stat(ent, st_mode);
}
/* When core.ignorecase=true, determine if a directory of the same name but differing
* case already exists within the Git repository. If it does, ensure the directory
* case of the file being added to the repository matches (is folded into) the existing
* entry's directory case.
*/
if (ignore_case) {
adjust_dirname_case(istate, ce->name);
}
if (!(flags & ADD_CACHE_RENORMALIZE)) {
alias = index_file_exists(istate, ce->name,
ce_namelen(ce), ignore_case);
if (alias &&
!ce_stage(alias) &&
!ie_match_stat(istate, alias, st, ce_option)) {
/* Nothing changed, really */
if (!S_ISGITLINK(alias->ce_mode))
ce_mark_uptodate(alias);
alias->ce_flags |= CE_ADDED;
discard_cache_entry(ce);
return 0;
}
}
if (!intent_only) {
if (index_path(istate, &ce->oid, path, st, hash_flags)) {
discard_cache_entry(ce);
return error(_("unable to index file '%s'"), path);
}
} else
set_object_name_for_intent_to_add_entry(ce);
if (ignore_case && alias && different_name(ce, alias))
ce = create_alias_ce(istate, ce, alias);
ce->ce_flags |= CE_ADDED;
/* It was suspected to be racily clean, but it turns out to be Ok */
was_same = (alias &&
!ce_stage(alias) &&
oideq(&alias->oid, &ce->oid) &&
ce->ce_mode == alias->ce_mode);
if (pretend)
discard_cache_entry(ce);
else if (add_index_entry(istate, ce, add_option)) {
discard_cache_entry(ce);
return error(_("unable to add '%s' to index"), path);
}
if (verbose && !was_same)
printf("add '%s'\n", path);
return 0;
}
int add_file_to_index(struct index_state *istate, const char *path, int flags)
{
struct stat st;
if (lstat(path, &st))
die_errno(_("unable to stat '%s'"), path);
return add_to_index(istate, path, &st, flags);
}
struct cache_entry *make_empty_cache_entry(struct index_state *istate, size_t len)
{
return mem_pool__ce_calloc(find_mem_pool(istate), len);
}
struct cache_entry *make_empty_transient_cache_entry(size_t len,
struct mem_pool *ce_mem_pool)
{
if (ce_mem_pool)
return mem_pool__ce_calloc(ce_mem_pool, len);
return xcalloc(1, cache_entry_size(len));
}
enum verify_path_result {
PATH_OK,
PATH_INVALID,
PATH_DIR_WITH_SEP,
};
static enum verify_path_result verify_path_internal(const char *, unsigned);
int verify_path(const char *path, unsigned mode)
{
return verify_path_internal(path, mode) == PATH_OK;
}
struct cache_entry *make_cache_entry(struct index_state *istate,
unsigned int mode,
const struct object_id *oid,
const char *path,
int stage,
unsigned int refresh_options)
{
struct cache_entry *ce, *ret;
int len;
if (verify_path_internal(path, mode) == PATH_INVALID) {
error(_("invalid path '%s'"), path);
return NULL;
}
len = strlen(path);
ce = make_empty_cache_entry(istate, len);
oidcpy(&ce->oid, oid);
memcpy(ce->name, path, len);
ce->ce_flags = create_ce_flags(stage);
ce->ce_namelen = len;
ce->ce_mode = create_ce_mode(mode);
ret = refresh_cache_entry(istate, ce, refresh_options);
if (ret != ce)
discard_cache_entry(ce);
return ret;
}
struct cache_entry *make_transient_cache_entry(unsigned int mode,
const struct object_id *oid,
const char *path,
int stage,
struct mem_pool *ce_mem_pool)
{
struct cache_entry *ce;
int len;
if (!verify_path(path, mode)) {
error(_("invalid path '%s'"), path);
return NULL;
}
len = strlen(path);
ce = make_empty_transient_cache_entry(len, ce_mem_pool);
oidcpy(&ce->oid, oid);
memcpy(ce->name, path, len);
ce->ce_flags = create_ce_flags(stage);
ce->ce_namelen = len;
ce->ce_mode = create_ce_mode(mode);
return ce;
}
/*
* Chmod an index entry with either +x or -x.
*
* Returns -1 if the chmod for the particular cache entry failed (if it's
* not a regular file), -2 if an invalid flip argument is passed in, 0
* otherwise.
*/
int chmod_index_entry(struct index_state *istate, struct cache_entry *ce,
char flip)
{
if (!S_ISREG(ce->ce_mode))
return -1;
switch (flip) {
case '+':
ce->ce_mode |= 0111;
break;
case '-':
ce->ce_mode &= ~0111;
break;
default:
return -2;
}
cache_tree_invalidate_path(istate, ce->name);
ce->ce_flags |= CE_UPDATE_IN_BASE;
mark_fsmonitor_invalid(istate, ce);
istate->cache_changed |= CE_ENTRY_CHANGED;
return 0;
}
int ce_same_name(const struct cache_entry *a, const struct cache_entry *b)
{
int len = ce_namelen(a);
return ce_namelen(b) == len && !memcmp(a->name, b->name, len);
}
/*
* We fundamentally don't like some paths: we don't want
* dot or dot-dot anywhere, and for obvious reasons don't
* want to recurse into ".git" either.
*
* Also, we don't want double slashes or slashes at the
* end that can make pathnames ambiguous.
*/
static int verify_dotfile(const char *rest, unsigned mode)
{
/*
* The first character was '.', but that
* has already been discarded, we now test
* the rest.
*/
/* "." is not allowed */
if (*rest == '\0' || is_dir_sep(*rest))
return 0;
switch (*rest) {
/*
* ".git" followed by NUL or slash is bad. Note that we match
* case-insensitively here, even if ignore_case is not set.
* This outlaws ".GIT" everywhere out of an abundance of caution,
* since there's really no good reason to allow it.
*
* Once we've seen ".git", we can also find ".gitmodules", etc (also
* case-insensitively).
*/
case 'g':
case 'G':
if (rest[1] != 'i' && rest[1] != 'I')
break;
if (rest[2] != 't' && rest[2] != 'T')
break;
if (rest[3] == '\0' || is_dir_sep(rest[3]))
return 0;
if (S_ISLNK(mode)) {
rest += 3;
if (skip_iprefix(rest, "modules", &rest) &&
(*rest == '\0' || is_dir_sep(*rest)))
return 0;
}
break;
case '.':
if (rest[1] == '\0' || is_dir_sep(rest[1]))
return 0;
}
return 1;
}
static enum verify_path_result verify_path_internal(const char *path,
unsigned mode)
{
char c = 0;
if (has_dos_drive_prefix(path))
return PATH_INVALID;
if (!is_valid_path(path))
return PATH_INVALID;
goto inside;
for (;;) {
if (!c)
return PATH_OK;
if (is_dir_sep(c)) {
inside:
if (protect_hfs) {
if (is_hfs_dotgit(path))
return PATH_INVALID;
if (S_ISLNK(mode)) {
if (is_hfs_dotgitmodules(path))
return PATH_INVALID;
}
}
if (protect_ntfs) {
#if defined GIT_WINDOWS_NATIVE || defined __CYGWIN__
if (c == '\\')
return PATH_INVALID;
#endif
if (is_ntfs_dotgit(path))
return PATH_INVALID;
if (S_ISLNK(mode)) {
if (is_ntfs_dotgitmodules(path))
return PATH_INVALID;
}
}
c = *path++;
if ((c == '.' && !verify_dotfile(path, mode)) ||
is_dir_sep(c))
return PATH_INVALID;
/*
* allow terminating directory separators for
* sparse directory entries.
*/
if (c == '\0')
return S_ISDIR(mode) ? PATH_DIR_WITH_SEP :
PATH_INVALID;
} else if (c == '\\' && protect_ntfs) {
if (is_ntfs_dotgit(path))
return PATH_INVALID;
if (S_ISLNK(mode)) {
if (is_ntfs_dotgitmodules(path))
return PATH_INVALID;
}
}
c = *path++;
}
}
/*
* Do we have another file that has the beginning components being a
* proper superset of the name we're trying to add?
*/
static int has_file_name(struct index_state *istate,
const struct cache_entry *ce, int pos, int ok_to_replace)
{
int retval = 0;
int len = ce_namelen(ce);
int stage = ce_stage(ce);
const char *name = ce->name;
while (pos < istate->cache_nr) {
struct cache_entry *p = istate->cache[pos++];
if (len >= ce_namelen(p))
break;
if (memcmp(name, p->name, len))
break;
if (ce_stage(p) != stage)
continue;
if (p->name[len] != '/')
continue;
if (p->ce_flags & CE_REMOVE)
continue;
retval = -1;
if (!ok_to_replace)
break;
remove_index_entry_at(istate, --pos);
}
return retval;
}
/*
* Like strcmp(), but also return the offset of the first change.
* If strings are equal, return the length.
*/
int strcmp_offset(const char *s1, const char *s2, size_t *first_change)
{
size_t k;
if (!first_change)
return strcmp(s1, s2);
for (k = 0; s1[k] == s2[k]; k++)
if (s1[k] == '\0')
break;
*first_change = k;
return (unsigned char)s1[k] - (unsigned char)s2[k];
}
/*
* Do we have another file with a pathname that is a proper
* subset of the name we're trying to add?
*
* That is, is there another file in the index with a path
* that matches a sub-directory in the given entry?
*/
static int has_dir_name(struct index_state *istate,
const struct cache_entry *ce, int pos, int ok_to_replace)
{
int retval = 0;
int stage = ce_stage(ce);
const char *name = ce->name;
const char *slash = name + ce_namelen(ce);
size_t len_eq_last;
int cmp_last = 0;
/*
* We are frequently called during an iteration on a sorted
* list of pathnames and while building a new index. Therefore,
* there is a high probability that this entry will eventually
* be appended to the index, rather than inserted in the middle.
* If we can confirm that, we can avoid binary searches on the
* components of the pathname.
*
* Compare the entry's full path with the last path in the index.
*/
if (istate->cache_nr > 0) {
cmp_last = strcmp_offset(name,
istate->cache[istate->cache_nr - 1]->name,
&len_eq_last);
if (cmp_last > 0) {
if (name[len_eq_last] != '/') {
/*
* The entry sorts AFTER the last one in the
* index.
*
* If there were a conflict with "file", then our
* name would start with "file/" and the last index
* entry would start with "file" but not "file/".
*
* The next character after common prefix is
* not '/', so there can be no conflict.
*/
return retval;
} else {
/*
* The entry sorts AFTER the last one in the
* index, and the next character after common
* prefix is '/'.
*
* Either the last index entry is a file in
* conflict with this entry, or it has a name
* which sorts between this entry and the
* potential conflicting file.
*
* In both cases, we fall through to the loop
* below and let the regular search code handle it.
*/
}
} else if (cmp_last == 0) {
/*
* The entry exactly matches the last one in the
* index, but because of multiple stage and CE_REMOVE
* items, we fall through and let the regular search
* code handle it.
*/
}
}
for (;;) {
size_t len;
for (;;) {
if (*--slash == '/')
break;
if (slash <= ce->name)
return retval;
}
len = slash - name;
pos = index_name_stage_pos(istate, name, len, stage, EXPAND_SPARSE);
if (pos >= 0) {
/*
* Found one, but not so fast. This could
* be a marker that says "I was here, but
* I am being removed". Such an entry is
* not a part of the resulting tree, and
* it is Ok to have a directory at the same
* path.
*/
if (!(istate->cache[pos]->ce_flags & CE_REMOVE)) {
retval = -1;
if (!ok_to_replace)
break;
remove_index_entry_at(istate, pos);
continue;
}
}
else
pos = -pos-1;
/*
* Trivial optimization: if we find an entry that
* already matches the sub-directory, then we know
* we're ok, and we can exit.
*/
while (pos < istate->cache_nr) {
struct cache_entry *p = istate->cache[pos];
if ((ce_namelen(p) <= len) ||
(p->name[len] != '/') ||
memcmp(p->name, name, len))
break; /* not our subdirectory */
if (ce_stage(p) == stage && !(p->ce_flags & CE_REMOVE))
/*
* p is at the same stage as our entry, and
* is a subdirectory of what we are looking
* at, so we cannot have conflicts at our
* level or anything shorter.
*/
return retval;
pos++;
}
}
return retval;
}
/* We may be in a situation where we already have path/file and path
* is being added, or we already have path and path/file is being
* added. Either one would result in a nonsense tree that has path
* twice when git-write-tree tries to write it out. Prevent it.
*
* If ok-to-replace is specified, we remove the conflicting entries
* from the cache so the caller should recompute the insert position.
* When this happens, we return non-zero.
*/
static int check_file_directory_conflict(struct index_state *istate,
const struct cache_entry *ce,
int pos, int ok_to_replace)
{
int retval;
/*
* When ce is an "I am going away" entry, we allow it to be added
*/
if (ce->ce_flags & CE_REMOVE)
return 0;
/*
* We check if the path is a sub-path of a subsequent pathname
* first, since removing those will not change the position
* in the array.
*/
retval = has_file_name(istate, ce, pos, ok_to_replace);
/*
* Then check if the path might have a clashing sub-directory
* before it.
*/
return retval + has_dir_name(istate, ce, pos, ok_to_replace);
}
static int add_index_entry_with_check(struct index_state *istate, struct cache_entry *ce, int option)
{
int pos;
int ok_to_add = option & ADD_CACHE_OK_TO_ADD;
int ok_to_replace = option & ADD_CACHE_OK_TO_REPLACE;
int skip_df_check = option & ADD_CACHE_SKIP_DFCHECK;
int new_only = option & ADD_CACHE_NEW_ONLY;
/*
* If this entry's path sorts after the last entry in the index,
* we can avoid searching for it.
*/
if (istate->cache_nr > 0 &&
strcmp(ce->name, istate->cache[istate->cache_nr - 1]->name) > 0)
pos = index_pos_to_insert_pos(istate->cache_nr);
else
pos = index_name_stage_pos(istate, ce->name, ce_namelen(ce), ce_stage(ce), EXPAND_SPARSE);
/*
* Cache tree path should be invalidated only after index_name_stage_pos,
* in case it expands a sparse index.
*/
if (!(option & ADD_CACHE_KEEP_CACHE_TREE))
cache_tree_invalidate_path(istate, ce->name);
/* existing match? Just replace it. */
if (pos >= 0) {
if (!new_only)
replace_index_entry(istate, pos, ce);
return 0;
}
pos = -pos-1;
if (!(option & ADD_CACHE_KEEP_CACHE_TREE))
untracked_cache_add_to_index(istate, ce->name);
/*
* Inserting a merged entry ("stage 0") into the index
* will always replace all non-merged entries..
*/
if (pos < istate->cache_nr && ce_stage(ce) == 0) {
while (ce_same_name(istate->cache[pos], ce)) {
ok_to_add = 1;
if (!remove_index_entry_at(istate, pos))
break;
}
}
if (!ok_to_add)
return -1;
if (verify_path_internal(ce->name, ce->ce_mode) == PATH_INVALID)
return error(_("invalid path '%s'"), ce->name);
if (!skip_df_check &&
check_file_directory_conflict(istate, ce, pos, ok_to_replace)) {
if (!ok_to_replace)
return error(_("'%s' appears as both a file and as a directory"),
ce->name);
pos = index_name_stage_pos(istate, ce->name, ce_namelen(ce), ce_stage(ce), EXPAND_SPARSE);
pos = -pos-1;
}
return pos + 1;
}
int add_index_entry(struct index_state *istate, struct cache_entry *ce, int option)
{
int pos;
if (option & ADD_CACHE_JUST_APPEND)
pos = istate->cache_nr;
else {
int ret;
ret = add_index_entry_with_check(istate, ce, option);
if (ret <= 0)
return ret;
pos = ret - 1;
}
/* Make sure the array is big enough .. */
ALLOC_GROW(istate->cache, istate->cache_nr + 1, istate->cache_alloc);
/* Add it in.. */
istate->cache_nr++;
if (istate->cache_nr > pos + 1)
MOVE_ARRAY(istate->cache + pos + 1, istate->cache + pos,
istate->cache_nr - pos - 1);
set_index_entry(istate, pos, ce);
istate->cache_changed |= CE_ENTRY_ADDED;
return 0;
}
/*
* "refresh" does not calculate a new sha1 file or bring the
* cache up-to-date for mode/content changes. But what it
* _does_ do is to "re-match" the stat information of a file
* with the cache, so that you can refresh the cache for a
* file that hasn't been changed but where the stat entry is
* out of date.
*
* For example, you'd want to do this after doing a "git-read-tree",
* to link up the stat cache details with the proper files.
*/
static struct cache_entry *refresh_cache_ent(struct index_state *istate,
struct cache_entry *ce,
unsigned int options, int *err,
int *changed_ret,
int *t2_did_lstat,
int *t2_did_scan)
{
struct stat st;
struct cache_entry *updated;
int changed;
int refresh = options & CE_MATCH_REFRESH;
int ignore_valid = options & CE_MATCH_IGNORE_VALID;
int ignore_skip_worktree = options & CE_MATCH_IGNORE_SKIP_WORKTREE;
int ignore_missing = options & CE_MATCH_IGNORE_MISSING;
int ignore_fsmonitor = options & CE_MATCH_IGNORE_FSMONITOR;
if (!refresh || ce_uptodate(ce))
return ce;
if (!ignore_fsmonitor)
refresh_fsmonitor(istate);
/*
* CE_VALID or CE_SKIP_WORKTREE means the user promised us
* that the change to the work tree does not matter and told
* us not to worry.
*/
if (!ignore_skip_worktree && ce_skip_worktree(ce)) {
ce_mark_uptodate(ce);
return ce;
}
if (!ignore_valid && (ce->ce_flags & CE_VALID)) {
ce_mark_uptodate(ce);
return ce;
}
if (!ignore_fsmonitor && (ce->ce_flags & CE_FSMONITOR_VALID)) {
ce_mark_uptodate(ce);
return ce;
}
if (has_symlink_leading_path(ce->name, ce_namelen(ce))) {
if (ignore_missing)
return ce;
if (err)
*err = ENOENT;
return NULL;
}
if (t2_did_lstat)
*t2_did_lstat = 1;
if (lstat(ce->name, &st) < 0) {
if (ignore_missing && errno == ENOENT)
return ce;
if (err)
*err = errno;
return NULL;
}
changed = ie_match_stat(istate, ce, &st, options);
if (changed_ret)
*changed_ret = changed;
if (!changed) {
/*
* The path is unchanged. If we were told to ignore
* valid bit, then we did the actual stat check and
* found that the entry is unmodified. If the entry
* is not marked VALID, this is the place to mark it
* valid again, under "assume unchanged" mode.
*/
if (ignore_valid && assume_unchanged &&
!(ce->ce_flags & CE_VALID))
; /* mark this one VALID again */
else {
/*
* We do not mark the index itself "modified"
* because CE_UPTODATE flag is in-core only;
* we are not going to write this change out.
*/
if (!S_ISGITLINK(ce->ce_mode)) {
ce_mark_uptodate(ce);
mark_fsmonitor_valid(istate, ce);
}
return ce;
}
}
if (t2_did_scan)
*t2_did_scan = 1;
if (ie_modified(istate, ce, &st, options)) {
if (err)
*err = EINVAL;
return NULL;
}
updated = make_empty_cache_entry(istate, ce_namelen(ce));
copy_cache_entry(updated, ce);
memcpy(updated->name, ce->name, ce->ce_namelen + 1);
fill_stat_cache_info(istate, updated, &st);
/*
* If ignore_valid is not set, we should leave CE_VALID bit
* alone. Otherwise, paths marked with --no-assume-unchanged
* (i.e. things to be edited) will reacquire CE_VALID bit
* automatically, which is not really what we want.
*/
if (!ignore_valid && assume_unchanged &&
!(ce->ce_flags & CE_VALID))
updated->ce_flags &= ~CE_VALID;
/* istate->cache_changed is updated in the caller */
return updated;
}
static void show_file(const char * fmt, const char * name, int in_porcelain,
int * first, const char *header_msg)
{
if (in_porcelain && *first && header_msg) {
printf("%s\n", header_msg);
*first = 0;
}
printf(fmt, name);
}
int repo_refresh_and_write_index(struct repository *repo,
unsigned int refresh_flags,
unsigned int write_flags,
int gentle,
const struct pathspec *pathspec,
char *seen, const char *header_msg)
{
struct lock_file lock_file = LOCK_INIT;
int fd, ret = 0;
fd = repo_hold_locked_index(repo, &lock_file, 0);
if (!gentle && fd < 0)
return -1;
if (refresh_index(repo->index, refresh_flags, pathspec, seen, header_msg))
ret = 1;
if (0 <= fd && write_locked_index(repo->index, &lock_file, COMMIT_LOCK | write_flags))
ret = -1;
return ret;
}
int refresh_index(struct index_state *istate, unsigned int flags,
const struct pathspec *pathspec,
char *seen, const char *header_msg)
{
int i;
int has_errors = 0;
int really = (flags & REFRESH_REALLY) != 0;
int allow_unmerged = (flags & REFRESH_UNMERGED) != 0;
int quiet = (flags & REFRESH_QUIET) != 0;
int not_new = (flags & REFRESH_IGNORE_MISSING) != 0;
int ignore_submodules = (flags & REFRESH_IGNORE_SUBMODULES) != 0;
int ignore_skip_worktree = (flags & REFRESH_IGNORE_SKIP_WORKTREE) != 0;
int first = 1;
int in_porcelain = (flags & REFRESH_IN_PORCELAIN);
unsigned int options = (CE_MATCH_REFRESH |
(really ? CE_MATCH_IGNORE_VALID : 0) |
(not_new ? CE_MATCH_IGNORE_MISSING : 0));
const char *modified_fmt;
const char *deleted_fmt;
const char *typechange_fmt;
const char *added_fmt;
const char *unmerged_fmt;
struct progress *progress = NULL;
int t2_sum_lstat = 0;
int t2_sum_scan = 0;
if (flags & REFRESH_PROGRESS && isatty(2))
progress = start_delayed_progress(_("Refresh index"),
istate->cache_nr);
trace_performance_enter();
modified_fmt = in_porcelain ? "M\t%s\n" : "%s: needs update\n";
deleted_fmt = in_porcelain ? "D\t%s\n" : "%s: needs update\n";
typechange_fmt = in_porcelain ? "T\t%s\n" : "%s: needs update\n";
added_fmt = in_porcelain ? "A\t%s\n" : "%s: needs update\n";
unmerged_fmt = in_porcelain ? "U\t%s\n" : "%s: needs merge\n";
/*
* Use the multi-threaded preload_index() to refresh most of the
* cache entries quickly then in the single threaded loop below,
* we only have to do the special cases that are left.
*/
preload_index(istate, pathspec, 0);
trace2_region_enter("index", "refresh", NULL);
for (i = 0; i < istate->cache_nr; i++) {
struct cache_entry *ce, *new_entry;
int cache_errno = 0;
int changed = 0;
int filtered = 0;
int t2_did_lstat = 0;
int t2_did_scan = 0;
ce = istate->cache[i];
if (ignore_submodules && S_ISGITLINK(ce->ce_mode))
continue;
if (ignore_skip_worktree && ce_skip_worktree(ce))
continue;
/*
* If this entry is a sparse directory, then there isn't
* any stat() information to update. Ignore the entry.
*/
if (S_ISSPARSEDIR(ce->ce_mode))
continue;
if (pathspec && !ce_path_match(istate, ce, pathspec, seen))
filtered = 1;
if (ce_stage(ce)) {
while ((i < istate->cache_nr) &&
! strcmp(istate->cache[i]->name, ce->name))
i++;
i--;
if (allow_unmerged)
continue;
if (!filtered)
show_file(unmerged_fmt, ce->name, in_porcelain,
&first, header_msg);
has_errors = 1;
continue;
}
if (filtered)
continue;
new_entry = refresh_cache_ent(istate, ce, options,
&cache_errno, &changed,
&t2_did_lstat, &t2_did_scan);
t2_sum_lstat += t2_did_lstat;
t2_sum_scan += t2_did_scan;
if (new_entry == ce)
continue;
display_progress(progress, i);
if (!new_entry) {
const char *fmt;
if (really && cache_errno == EINVAL) {
/* If we are doing --really-refresh that
* means the index is not valid anymore.
*/
ce->ce_flags &= ~CE_VALID;
ce->ce_flags |= CE_UPDATE_IN_BASE;
mark_fsmonitor_invalid(istate, ce);
istate->cache_changed |= CE_ENTRY_CHANGED;
}
if (quiet)
continue;
if (cache_errno == ENOENT)
fmt = deleted_fmt;
else if (ce_intent_to_add(ce))
fmt = added_fmt; /* must be before other checks */
else if (changed & TYPE_CHANGED)
fmt = typechange_fmt;
else
fmt = modified_fmt;
show_file(fmt,
ce->name, in_porcelain, &first, header_msg);
has_errors = 1;
continue;
}
replace_index_entry(istate, i, new_entry);
}
trace2_data_intmax("index", NULL, "refresh/sum_lstat", t2_sum_lstat);
trace2_data_intmax("index", NULL, "refresh/sum_scan", t2_sum_scan);
trace2_region_leave("index", "refresh", NULL);
display_progress(progress, istate->cache_nr);
stop_progress(&progress);
trace_performance_leave("refresh index");
return has_errors;
}
struct cache_entry *refresh_cache_entry(struct index_state *istate,
struct cache_entry *ce,
unsigned int options)
{
return refresh_cache_ent(istate, ce, options, NULL, NULL, NULL, NULL);
}
/*****************************************************************
* Index File I/O
*****************************************************************/
#define INDEX_FORMAT_DEFAULT 3
static unsigned int get_index_format_default(struct repository *r)
{
char *envversion = getenv("GIT_INDEX_VERSION");
char *endp;
unsigned int version = INDEX_FORMAT_DEFAULT;
if (!envversion) {
prepare_repo_settings(r);
if (r->settings.index_version >= 0)
version = r->settings.index_version;
if (version < INDEX_FORMAT_LB || INDEX_FORMAT_UB < version) {
warning(_("index.version set, but the value is invalid.\n"
"Using version %i"), INDEX_FORMAT_DEFAULT);
return INDEX_FORMAT_DEFAULT;
}
return version;
}
version = strtoul(envversion, &endp, 10);
if (*endp ||
version < INDEX_FORMAT_LB || INDEX_FORMAT_UB < version) {
warning(_("GIT_INDEX_VERSION set, but the value is invalid.\n"
"Using version %i"), INDEX_FORMAT_DEFAULT);
version = INDEX_FORMAT_DEFAULT;
}
return version;
}
/*
* dev/ino/uid/gid/size are also just tracked to the low 32 bits
* Again - this is just a (very strong in practice) heuristic that
* the inode hasn't changed.
*
* We save the fields in big-endian order to allow using the
* index file over NFS transparently.
*/
struct ondisk_cache_entry {
struct cache_time ctime;
struct cache_time mtime;
uint32_t dev;
uint32_t ino;
uint32_t mode;
uint32_t uid;
uint32_t gid;
uint32_t size;
/*
* unsigned char hash[hashsz];
* uint16_t flags;
* if (flags & CE_EXTENDED)
* uint16_t flags2;
*/
unsigned char data[GIT_MAX_RAWSZ + 2 * sizeof(uint16_t)];
char name[FLEX_ARRAY];
};
/* These are only used for v3 or lower */
#define align_padding_size(size, len) ((size + (len) + 8) & ~7) - (size + len)
#define align_flex_name(STRUCT,len) ((offsetof(struct STRUCT,data) + (len) + 8) & ~7)
#define ondisk_cache_entry_size(len) align_flex_name(ondisk_cache_entry,len)
#define ondisk_data_size(flags, len) (the_hash_algo->rawsz + \
((flags & CE_EXTENDED) ? 2 : 1) * sizeof(uint16_t) + len)
#define ondisk_data_size_max(len) (ondisk_data_size(CE_EXTENDED, len))
#define ondisk_ce_size(ce) (ondisk_cache_entry_size(ondisk_data_size((ce)->ce_flags, ce_namelen(ce))))
/* Allow fsck to force verification of the index checksum. */
int verify_index_checksum;
/* Allow fsck to force verification of the cache entry order. */
int verify_ce_order;
static int verify_hdr(const struct cache_header *hdr, unsigned long size)
{
git_hash_ctx c;
unsigned char hash[GIT_MAX_RAWSZ];
int hdr_version;
unsigned char *start, *end;
struct object_id oid;
if (hdr->hdr_signature != htonl(CACHE_SIGNATURE))
return error(_("bad signature 0x%08x"), hdr->hdr_signature);
hdr_version = ntohl(hdr->hdr_version);
if (hdr_version < INDEX_FORMAT_LB || INDEX_FORMAT_UB < hdr_version)
return error(_("bad index version %d"), hdr_version);
if (!verify_index_checksum)
return 0;
end = (unsigned char *)hdr + size;
start = end - the_hash_algo->rawsz;
oidread(&oid, start, the_repository->hash_algo);
if (oideq(&oid, null_oid()))
return 0;
the_hash_algo->init_fn(&c);
the_hash_algo->update_fn(&c, hdr, size - the_hash_algo->rawsz);
the_hash_algo->final_fn(hash, &c);
if (!hasheq(hash, start, the_repository->hash_algo))
return error(_("bad index file sha1 signature"));
return 0;
}
static int read_index_extension(struct index_state *istate,
const char *ext, const char *data, unsigned long sz)
{
switch (CACHE_EXT(ext)) {
case CACHE_EXT_TREE:
istate->cache_tree = cache_tree_read(data, sz);
break;
case CACHE_EXT_RESOLVE_UNDO:
istate->resolve_undo = resolve_undo_read(data, sz);
break;
case CACHE_EXT_LINK:
if (read_link_extension(istate, data, sz))
return -1;
break;
case CACHE_EXT_UNTRACKED:
istate->untracked = read_untracked_extension(data, sz);
break;
case CACHE_EXT_FSMONITOR:
read_fsmonitor_extension(istate, data, sz);
break;
case CACHE_EXT_ENDOFINDEXENTRIES:
case CACHE_EXT_INDEXENTRYOFFSETTABLE:
/* already handled in do_read_index() */
break;
case CACHE_EXT_SPARSE_DIRECTORIES:
/* no content, only an indicator */
istate->sparse_index = INDEX_COLLAPSED;
break;
default:
if (*ext < 'A' || 'Z' < *ext)
return error(_("index uses %.4s extension, which we do not understand"),
ext);
fprintf_ln(stderr, _("ignoring %.4s extension"), ext);
break;
}
return 0;
}
/*
* Parses the contents of the cache entry contained within the 'ondisk' buffer
* into a new incore 'cache_entry'.
*
* Note that 'char *ondisk' may not be aligned to a 4-byte address interval in
* index v4, so we cannot cast it to 'struct ondisk_cache_entry *' and access
* its members. Instead, we use the byte offsets of members within the struct to
* identify where 'get_be16()', 'get_be32()', and 'oidread()' (which can all
* read from an unaligned memory buffer) should read from the 'ondisk' buffer
* into the corresponding incore 'cache_entry' members.
*/
static struct cache_entry *create_from_disk(struct mem_pool *ce_mem_pool,
unsigned int version,
const char *ondisk,
unsigned long *ent_size,
const struct cache_entry *previous_ce)
{
struct cache_entry *ce;
size_t len;
const char *name;
const unsigned hashsz = the_hash_algo->rawsz;
const char *flagsp = ondisk + offsetof(struct ondisk_cache_entry, data) + hashsz;
unsigned int flags;
size_t copy_len = 0;
/*
* Adjacent cache entries tend to share the leading paths, so it makes
* sense to only store the differences in later entries. In the v4
* on-disk format of the index, each on-disk cache entry stores the
* number of bytes to be stripped from the end of the previous name,
* and the bytes to append to the result, to come up with its name.
*/
int expand_name_field = version == 4;
/* On-disk flags are just 16 bits */
flags = get_be16(flagsp);
len = flags & CE_NAMEMASK;
if (flags & CE_EXTENDED) {
int extended_flags;
extended_flags = get_be16(flagsp + sizeof(uint16_t)) << 16;
/* We do not yet understand any bit out of CE_EXTENDED_FLAGS */
if (extended_flags & ~CE_EXTENDED_FLAGS)
die(_("unknown index entry format 0x%08x"), extended_flags);
flags |= extended_flags;
name = (const char *)(flagsp + 2 * sizeof(uint16_t));
}
else
name = (const char *)(flagsp + sizeof(uint16_t));
if (expand_name_field) {
const unsigned char *cp = (const unsigned char *)name;
size_t strip_len, previous_len;
/* If we're at the beginning of a block, ignore the previous name */
strip_len = decode_varint(&cp);
if (previous_ce) {
previous_len = previous_ce->ce_namelen;
if (previous_len < strip_len)
die(_("malformed name field in the index, near path '%s'"),
previous_ce->name);
copy_len = previous_len - strip_len;
}
name = (const char *)cp;
}
if (len == CE_NAMEMASK) {
len = strlen(name);
if (expand_name_field)
len += copy_len;
}
ce = mem_pool__ce_alloc(ce_mem_pool, len);
/*
* NEEDSWORK: using 'offsetof()' is cumbersome and should be replaced
* with something more akin to 'load_bitmap_entries_v1()'s use of
* 'read_be16'/'read_be32'. For consistency with the corresponding
* ondisk entry write function ('copy_cache_entry_to_ondisk()'), this
* should be done at the same time as removing references to
* 'ondisk_cache_entry' there.
*/
ce->ce_stat_data.sd_ctime.sec = get_be32(ondisk + offsetof(struct ondisk_cache_entry, ctime)
+ offsetof(struct cache_time, sec));
ce->ce_stat_data.sd_mtime.sec = get_be32(ondisk + offsetof(struct ondisk_cache_entry, mtime)
+ offsetof(struct cache_time, sec));
ce->ce_stat_data.sd_ctime.nsec = get_be32(ondisk + offsetof(struct ondisk_cache_entry, ctime)
+ offsetof(struct cache_time, nsec));
ce->ce_stat_data.sd_mtime.nsec = get_be32(ondisk + offsetof(struct ondisk_cache_entry, mtime)
+ offsetof(struct cache_time, nsec));
ce->ce_stat_data.sd_dev = get_be32(ondisk + offsetof(struct ondisk_cache_entry, dev));
ce->ce_stat_data.sd_ino = get_be32(ondisk + offsetof(struct ondisk_cache_entry, ino));
ce->ce_mode = get_be32(ondisk + offsetof(struct ondisk_cache_entry, mode));
ce->ce_stat_data.sd_uid = get_be32(ondisk + offsetof(struct ondisk_cache_entry, uid));
ce->ce_stat_data.sd_gid = get_be32(ondisk + offsetof(struct ondisk_cache_entry, gid));
ce->ce_stat_data.sd_size = get_be32(ondisk + offsetof(struct ondisk_cache_entry, size));
ce->ce_flags = flags & ~CE_NAMEMASK;
ce->ce_namelen = len;
ce->index = 0;
oidread(&ce->oid, (const unsigned char *)ondisk + offsetof(struct ondisk_cache_entry, data),
the_repository->hash_algo);
if (expand_name_field) {
if (copy_len)
memcpy(ce->name, previous_ce->name, copy_len);
memcpy(ce->name + copy_len, name, len + 1 - copy_len);
*ent_size = (name - ((char *)ondisk)) + len + 1 - copy_len;
} else {
memcpy(ce->name, name, len + 1);
*ent_size = ondisk_ce_size(ce);
}
return ce;
}
static void check_ce_order(struct index_state *istate)
{
unsigned int i;
if (!verify_ce_order)
return;
for (i = 1; i < istate->cache_nr; i++) {
struct cache_entry *ce = istate->cache[i - 1];
struct cache_entry *next_ce = istate->cache[i];
int name_compare = strcmp(ce->name, next_ce->name);
if (0 < name_compare)
die(_("unordered stage entries in index"));
if (!name_compare) {
if (!ce_stage(ce))
die(_("multiple stage entries for merged file '%s'"),
ce->name);
if (ce_stage(ce) > ce_stage(next_ce))
die(_("unordered stage entries for '%s'"),
ce->name);
}
}
}
static void tweak_untracked_cache(struct index_state *istate)
{
struct repository *r = the_repository;
prepare_repo_settings(r);
switch (r->settings.core_untracked_cache) {
case UNTRACKED_CACHE_REMOVE:
remove_untracked_cache(istate);
break;
case UNTRACKED_CACHE_WRITE:
add_untracked_cache(istate);
break;
case UNTRACKED_CACHE_KEEP:
/*
* Either an explicit "core.untrackedCache=keep", the
* default if "core.untrackedCache" isn't configured,
* or a fallback on an unknown "core.untrackedCache"
* value.
*/
break;
}
}
static void tweak_split_index(struct index_state *istate)
{
switch (git_config_get_split_index()) {
case -1: /* unset: do nothing */
break;
case 0: /* false */
remove_split_index(istate);
break;
case 1: /* true */
add_split_index(istate);
break;
default: /* unknown value: do nothing */
break;
}
}
static void post_read_index_from(struct index_state *istate)
{
check_ce_order(istate);
tweak_untracked_cache(istate);
tweak_split_index(istate);
tweak_fsmonitor(istate);
}
static size_t estimate_cache_size_from_compressed(unsigned int entries)
{
return entries * (sizeof(struct cache_entry) + CACHE_ENTRY_PATH_LENGTH);
}
static size_t estimate_cache_size(size_t ondisk_size, unsigned int entries)
{
long per_entry = sizeof(struct cache_entry) - sizeof(struct ondisk_cache_entry);
/*
* Account for potential alignment differences.
*/
per_entry += align_padding_size(per_entry, 0);
return ondisk_size + entries * per_entry;
}
struct index_entry_offset
{
/* starting byte offset into index file, count of index entries in this block */
int offset, nr;
};
struct index_entry_offset_table
{
int nr;
struct index_entry_offset entries[FLEX_ARRAY];
};
static struct index_entry_offset_table *read_ieot_extension(const char *mmap, size_t mmap_size, size_t offset);
static void write_ieot_extension(struct strbuf *sb, struct index_entry_offset_table *ieot);
static size_t read_eoie_extension(const char *mmap, size_t mmap_size);
static void write_eoie_extension(struct strbuf *sb, git_hash_ctx *eoie_context, size_t offset);
struct load_index_extensions
{
pthread_t pthread;
struct index_state *istate;
const char *mmap;
size_t mmap_size;
unsigned long src_offset;
};
static void *load_index_extensions(void *_data)
{
struct load_index_extensions *p = _data;
unsigned long src_offset = p->src_offset;
while (src_offset <= p->mmap_size - the_hash_algo->rawsz - 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.
*/
uint32_t extsize = get_be32(p->mmap + src_offset + 4);
if (read_index_extension(p->istate,
p->mmap + src_offset,
p->mmap + src_offset + 8,
extsize) < 0) {
munmap((void *)p->mmap, p->mmap_size);
die(_("index file corrupt"));
}
src_offset += 8;
src_offset += extsize;
}
return NULL;
}
/*
* A helper function that will load the specified range of cache entries
* from the memory mapped file and add them to the given index.
*/
static unsigned long load_cache_entry_block(struct index_state *istate,
struct mem_pool *ce_mem_pool, int offset, int nr, const char *mmap,
unsigned long start_offset, const struct cache_entry *previous_ce)
{
int i;
unsigned long src_offset = start_offset;
for (i = offset; i < offset + nr; i++) {
struct cache_entry *ce;
unsigned long consumed;
ce = create_from_disk(ce_mem_pool, istate->version,
mmap + src_offset,
&consumed, previous_ce);
set_index_entry(istate, i, ce);
src_offset += consumed;
previous_ce = ce;
}
return src_offset - start_offset;
}
static unsigned long load_all_cache_entries(struct index_state *istate,
const char *mmap, size_t mmap_size, unsigned long src_offset)
{
unsigned long consumed;
istate->ce_mem_pool = xmalloc(sizeof(*istate->ce_mem_pool));
if (istate->version == 4) {
mem_pool_init(istate->ce_mem_pool,
estimate_cache_size_from_compressed(istate->cache_nr));
} else {
mem_pool_init(istate->ce_mem_pool,
estimate_cache_size(mmap_size, istate->cache_nr));
}
consumed = load_cache_entry_block(istate, istate->ce_mem_pool,
0, istate->cache_nr, mmap, src_offset, NULL);
return consumed;
}
/*
* Mostly randomly chosen maximum thread counts: we
* cap the parallelism to online_cpus() threads, and we want
* to have at least 10000 cache entries per thread for it to
* be worth starting a thread.
*/
#define THREAD_COST (10000)
struct load_cache_entries_thread_data
{
pthread_t pthread;
struct index_state *istate;
struct mem_pool *ce_mem_pool;
int offset;
const char *mmap;
struct index_entry_offset_table *ieot;
int ieot_start; /* starting index into the ieot array */
int ieot_blocks; /* count of ieot entries to process */
unsigned long consumed; /* return # of bytes in index file processed */
};
/*
* A thread proc to run the load_cache_entries() computation
* across multiple background threads.
*/
static void *load_cache_entries_thread(void *_data)
{
struct load_cache_entries_thread_data *p = _data;
int i;
/* iterate across all ieot blocks assigned to this thread */
for (i = p->ieot_start; i < p->ieot_start + p->ieot_blocks; i++) {
p->consumed += load_cache_entry_block(p->istate, p->ce_mem_pool,
p->offset, p->ieot->entries[i].nr, p->mmap, p->ieot->entries[i].offset, NULL);
p->offset += p->ieot->entries[i].nr;
}
return NULL;
}
static unsigned long load_cache_entries_threaded(struct index_state *istate, const char *mmap, size_t mmap_size,
int nr_threads, struct index_entry_offset_table *ieot)
{
int i, offset, ieot_blocks, ieot_start, err;
struct load_cache_entries_thread_data *data;
unsigned long consumed = 0;
/* a little sanity checking */
if (istate->name_hash_initialized)
BUG("the name hash isn't thread safe");
istate->ce_mem_pool = xmalloc(sizeof(*istate->ce_mem_pool));
mem_pool_init(istate->ce_mem_pool, 0);
/* ensure we have no more threads than we have blocks to process */
if (nr_threads > ieot->nr)
nr_threads = ieot->nr;
CALLOC_ARRAY(data, nr_threads);
offset = ieot_start = 0;
ieot_blocks = DIV_ROUND_UP(ieot->nr, nr_threads);
for (i = 0; i < nr_threads; i++) {
struct load_cache_entries_thread_data *p = &data[i];
int nr, j;
if (ieot_start + ieot_blocks > ieot->nr)
ieot_blocks = ieot->nr - ieot_start;
p->istate = istate;
p->offset = offset;
p->mmap = mmap;
p->ieot = ieot;
p->ieot_start = ieot_start;
p->ieot_blocks = ieot_blocks;
/* create a mem_pool for each thread */
nr = 0;
for (j = p->ieot_start; j < p->ieot_start + p->ieot_blocks; j++)
nr += p->ieot->entries[j].nr;
p->ce_mem_pool = xmalloc(sizeof(*istate->ce_mem_pool));
if (istate->version == 4) {
mem_pool_init(p->ce_mem_pool,
estimate_cache_size_from_compressed(nr));
} else {
mem_pool_init(p->ce_mem_pool,
estimate_cache_size(mmap_size, nr));
}
err = pthread_create(&p->pthread, NULL, load_cache_entries_thread, p);
if (err)
die(_("unable to create load_cache_entries thread: %s"), strerror(err));
/* increment by the number of cache entries in the ieot block being processed */
for (j = 0; j < ieot_blocks; j++)
offset += ieot->entries[ieot_start + j].nr;
ieot_start += ieot_blocks;
}
for (i = 0; i < nr_threads; i++) {
struct load_cache_entries_thread_data *p = &data[i];
err = pthread_join(p->pthread, NULL);
if (err)
die(_("unable to join load_cache_entries thread: %s"), strerror(err));
mem_pool_combine(istate->ce_mem_pool, p->ce_mem_pool);
consumed += p->consumed;
}
free(data);
return consumed;
}
static void set_new_index_sparsity(struct index_state *istate)
{
/*
* If the index's repo exists, mark it sparse according to
* repo settings.
*/
prepare_repo_settings(istate->repo);
if (!istate->repo->settings.command_requires_full_index &&
is_sparse_index_allowed(istate, 0))
istate->sparse_index = 1;
}
/* remember to discard_cache() before reading a different cache! */
int do_read_index(struct index_state *istate, const char *path, int must_exist)
{
int fd;
struct stat st;
unsigned long src_offset;
const struct cache_header *hdr;
const char *mmap;
size_t mmap_size;
struct load_index_extensions p;
size_t extension_offset = 0;
int nr_threads, cpus;
struct index_entry_offset_table *ieot = NULL;
if (istate->initialized)
return istate->cache_nr;
istate->timestamp.sec = 0;
istate->timestamp.nsec = 0;
fd = open(path, O_RDONLY);
if (fd < 0) {
if (!must_exist && errno == ENOENT) {
set_new_index_sparsity(istate);
istate->initialized = 1;
return 0;
}
die_errno(_("%s: index file open failed"), path);
}
if (fstat(fd, &st))
die_errno(_("%s: cannot stat the open index"), path);
mmap_size = xsize_t(st.st_size);
if (mmap_size < sizeof(struct cache_header) + the_hash_algo->rawsz)
die(_("%s: index file smaller than expected"), path);
mmap = xmmap_gently(NULL, mmap_size, PROT_READ, MAP_PRIVATE, fd, 0);
if (mmap == MAP_FAILED)
die_errno(_("%s: unable to map index file%s"), path,
mmap_os_err());
close(fd);
hdr = (const struct cache_header *)mmap;
if (verify_hdr(hdr, mmap_size) < 0)
goto unmap;
oidread(&istate->oid, (const unsigned char *)hdr + mmap_size - the_hash_algo->rawsz,
the_repository->hash_algo);
istate->version = ntohl(hdr->hdr_version);
istate->cache_nr = ntohl(hdr->hdr_entries);
istate->cache_alloc = alloc_nr(istate->cache_nr);
CALLOC_ARRAY(istate->cache, istate->cache_alloc);
istate->initialized = 1;
p.istate = istate;
p.mmap = mmap;
p.mmap_size = mmap_size;
src_offset = sizeof(*hdr);
if (git_config_get_index_threads(&nr_threads))
nr_threads = 1;
/* TODO: does creating more threads than cores help? */
if (!nr_threads) {
nr_threads = istate->cache_nr / THREAD_COST;
cpus = online_cpus();
if (nr_threads > cpus)
nr_threads = cpus;
}
if (!HAVE_THREADS)
nr_threads = 1;
if (nr_threads > 1) {
extension_offset = read_eoie_extension(mmap, mmap_size);
if (extension_offset) {
int err;
p.src_offset = extension_offset;
err = pthread_create(&p.pthread, NULL, load_index_extensions, &p);
if (err)
die(_("unable to create load_index_extensions thread: %s"), strerror(err));
nr_threads--;
}
}
/*
* Locate and read the index entry offset table so that we can use it
* to multi-thread the reading of the cache entries.
*/
if (extension_offset && nr_threads > 1)
ieot = read_ieot_extension(mmap, mmap_size, extension_offset);
if (ieot) {
src_offset += load_cache_entries_threaded(istate, mmap, mmap_size, nr_threads, ieot);
free(ieot);
} else {
src_offset += load_all_cache_entries(istate, mmap, mmap_size, src_offset);
}
istate->timestamp.sec = st.st_mtime;
istate->timestamp.nsec = ST_MTIME_NSEC(st);
/* if we created a thread, join it otherwise load the extensions on the primary thread */
if (extension_offset) {
int ret = pthread_join(p.pthread, NULL);
if (ret)
die(_("unable to join load_index_extensions thread: %s"), strerror(ret));
} else {
p.src_offset = src_offset;
load_index_extensions(&p);
}
munmap((void *)mmap, mmap_size);
/*
* TODO trace2: replace "the_repository" with the actual repo instance
* that is associated with the given "istate".
*/
trace2_data_intmax("index", the_repository, "read/version",
istate->version);
trace2_data_intmax("index", the_repository, "read/cache_nr",
istate->cache_nr);
/*
* If the command explicitly requires a full index, force it
* to be full. Otherwise, correct the sparsity based on repository
* settings and other properties of the index (if necessary).
*/
prepare_repo_settings(istate->repo);
if (istate->repo->settings.command_requires_full_index)
ensure_full_index(istate);
else
ensure_correct_sparsity(istate);
return istate->cache_nr;
unmap:
munmap((void *)mmap, mmap_size);
die(_("index file corrupt"));
}
/*
* Signal that the shared index is used by updating its mtime.
*
* This way, shared index can be removed if they have not been used
* for some time.
*/
static void freshen_shared_index(const char *shared_index, int warn)
{
if (!check_and_freshen_file(shared_index, 1) && warn)
warning(_("could not freshen shared index '%s'"), shared_index);
}
int read_index_from(struct index_state *istate, const char *path,
const char *gitdir)
{
struct split_index *split_index;
int ret;
char *base_oid_hex;
char *base_path;
/* istate->initialized covers both .git/index and .git/sharedindex.xxx */
if (istate->initialized)
return istate->cache_nr;
/*
* TODO trace2: replace "the_repository" with the actual repo instance
* that is associated with the given "istate".
*/
trace2_region_enter_printf("index", "do_read_index", the_repository,
"%s", path);
trace_performance_enter();
ret = do_read_index(istate, path, 0);
trace_performance_leave("read cache %s", path);
trace2_region_leave_printf("index", "do_read_index", the_repository,
"%s", path);
split_index = istate->split_index;
if (!split_index || is_null_oid(&split_index->base_oid)) {
post_read_index_from(istate);
return ret;
}
trace_performance_enter();
if (split_index->base)
release_index(split_index->base);
else
ALLOC_ARRAY(split_index->base, 1);
index_state_init(split_index->base, istate->repo);
base_oid_hex = oid_to_hex(&split_index->base_oid);
base_path = xstrfmt("%s/sharedindex.%s", gitdir, base_oid_hex);
if (file_exists(base_path)) {
trace2_region_enter_printf("index", "shared/do_read_index",
the_repository, "%s", base_path);
ret = do_read_index(split_index->base, base_path, 0);
trace2_region_leave_printf("index", "shared/do_read_index",
the_repository, "%s", base_path);
} else {
char *path_copy = xstrdup(path);
char *base_path2 = xstrfmt("%s/sharedindex.%s",
dirname(path_copy), base_oid_hex);
free(path_copy);
trace2_region_enter_printf("index", "shared/do_read_index",
the_repository, "%s", base_path2);
ret = do_read_index(split_index->base, base_path2, 1);
trace2_region_leave_printf("index", "shared/do_read_index",
the_repository, "%s", base_path2);
free(base_path2);
}
if (!oideq(&split_index->base_oid, &split_index->base->oid))
die(_("broken index, expect %s in %s, got %s"),
base_oid_hex, base_path,
oid_to_hex(&split_index->base->oid));
freshen_shared_index(base_path, 0);
merge_base_index(istate);
post_read_index_from(istate);
trace_performance_leave("read cache %s", base_path);
free(base_path);
return ret;
}
int is_index_unborn(struct index_state *istate)
{
return (!istate->cache_nr && !istate->timestamp.sec);
}
void index_state_init(struct index_state *istate, struct repository *r)
{
struct index_state blank = INDEX_STATE_INIT(r);
memcpy(istate, &blank, sizeof(*istate));
}
void release_index(struct index_state *istate)
{
/*
* Cache entries in istate->cache[] should have been allocated
* from the memory pool associated with this index, or from an
* associated split_index. There is no need to free individual
* cache entries. validate_cache_entries can detect when this
* assertion does not hold.
*/
validate_cache_entries(istate);
resolve_undo_clear_index(istate);
free_name_hash(istate);
cache_tree_free(&(istate->cache_tree));
free(istate->fsmonitor_last_update);
free(istate->cache);
discard_split_index(istate);
free_untracked_cache(istate->untracked);
if (istate->sparse_checkout_patterns) {
clear_pattern_list(istate->sparse_checkout_patterns);
FREE_AND_NULL(istate->sparse_checkout_patterns);
}
if (istate->ce_mem_pool) {
mem_pool_discard(istate->ce_mem_pool, should_validate_cache_entries());
FREE_AND_NULL(istate->ce_mem_pool);
}
}
void discard_index(struct index_state *istate)
{
release_index(istate);
index_state_init(istate, istate->repo);
}
/*
* Validate the cache entries of this index.
* All cache entries associated with this index
* should have been allocated by the memory pool
* associated with this index, or by a referenced
* split index.
*/
void validate_cache_entries(const struct index_state *istate)
{
int i;
if (!should_validate_cache_entries() ||!istate || !istate->initialized)
return;
for (i = 0; i < istate->cache_nr; i++) {
if (!istate) {
BUG("cache entry is not allocated from expected memory pool");
} else if (!istate->ce_mem_pool ||
!mem_pool_contains(istate->ce_mem_pool, istate->cache[i])) {
if (!istate->split_index ||
!istate->split_index->base ||
!istate->split_index->base->ce_mem_pool ||
!mem_pool_contains(istate->split_index->base->ce_mem_pool, istate->cache[i])) {
BUG("cache entry is not allocated from expected memory pool");
}
}
}
if (istate->split_index)
validate_cache_entries(istate->split_index->base);
}
int unmerged_index(const struct index_state *istate)
{
int i;
for (i = 0; i < istate->cache_nr; i++) {
if (ce_stage(istate->cache[i]))
return 1;
}
return 0;
}
int repo_index_has_changes(struct repository *repo,
struct tree *tree,
struct strbuf *sb)
{
struct index_state *istate = repo->index;
struct object_id cmp;
int i;
if (tree)
cmp = tree->object.oid;
if (tree || !repo_get_oid_tree(repo, "HEAD", &cmp)) {
struct diff_options opt;
repo_diff_setup(repo, &opt);
opt.flags.exit_with_status = 1;
if (!sb)
opt.flags.quick = 1;
diff_setup_done(&opt);
do_diff_cache(&cmp, &opt);
diffcore_std(&opt);
for (i = 0; sb && i < diff_queued_diff.nr; i++) {
if (i)
strbuf_addch(sb, ' ');
strbuf_addstr(sb, diff_queued_diff.queue[i]->two->path);
}
diff_flush(&opt);
return opt.flags.has_changes != 0;
} else {
/* TODO: audit for interaction with sparse-index. */
ensure_full_index(istate);
for (i = 0; sb && i < istate->cache_nr; i++) {
if (i)
strbuf_addch(sb, ' ');
strbuf_addstr(sb, istate->cache[i]->name);
}
return !!istate->cache_nr;
}
}
static int write_index_ext_header(struct hashfile *f,
git_hash_ctx *eoie_f,
unsigned int ext,
unsigned int sz)
{
hashwrite_be32(f, ext);
hashwrite_be32(f, sz);
if (eoie_f) {
ext = htonl(ext);
sz = htonl(sz);
the_hash_algo->update_fn(eoie_f, &ext, sizeof(ext));
the_hash_algo->update_fn(eoie_f, &sz, sizeof(sz));
}
return 0;
}
static void ce_smudge_racily_clean_entry(struct index_state *istate,
struct cache_entry *ce)
{
/*
* The only thing we care about in this function is to smudge the
* falsely clean entry due to touch-update-touch race, so we leave
* everything else as they are. We are called for entries whose
* ce_stat_data.sd_mtime match the index file mtime.
*
* Note that this actually does not do much for gitlinks, for
* which ce_match_stat_basic() always goes to the actual
* contents. The caller checks with is_racy_timestamp() which
* always says "no" for gitlinks, so we are not called for them ;-)
*/
struct stat st;
if (lstat(ce->name, &st) < 0)
return;
if (ce_match_stat_basic(ce, &st))
return;
if (ce_modified_check_fs(istate, ce, &st)) {
/* This is "racily clean"; smudge it. Note that this
* is a tricky code. At first glance, it may appear
* that it can break with this sequence:
*
* $ echo xyzzy >frotz
* $ git-update-index --add frotz
* $ : >frotz
* $ sleep 3
* $ echo filfre >nitfol
* $ git-update-index --add nitfol
*
* but it does not. When the second update-index runs,
* it notices that the entry "frotz" has the same timestamp
* as index, and if we were to smudge it by resetting its
* size to zero here, then the object name recorded
* in index is the 6-byte file but the cached stat information
* becomes zero --- which would then match what we would
* obtain from the filesystem next time we stat("frotz").
*
* However, the second update-index, before calling
* this function, notices that the cached size is 6
* bytes and what is on the filesystem is an empty
* file, and never calls us, so the cached size information
* for "frotz" stays 6 which does not match the filesystem.
*/
ce->ce_stat_data.sd_size = 0;
}
}
/* Copy miscellaneous fields but not the name */
static void copy_cache_entry_to_ondisk(struct ondisk_cache_entry *ondisk,
struct cache_entry *ce)
{
short flags;
const unsigned hashsz = the_hash_algo->rawsz;
uint16_t *flagsp = (uint16_t *)(ondisk->data + hashsz);
ondisk->ctime.sec = htonl(ce->ce_stat_data.sd_ctime.sec);
ondisk->mtime.sec = htonl(ce->ce_stat_data.sd_mtime.sec);
ondisk->ctime.nsec = htonl(ce->ce_stat_data.sd_ctime.nsec);
ondisk->mtime.nsec = htonl(ce->ce_stat_data.sd_mtime.nsec);
ondisk->dev = htonl(ce->ce_stat_data.sd_dev);
ondisk->ino = htonl(ce->ce_stat_data.sd_ino);
ondisk->mode = htonl(ce->ce_mode);
ondisk->uid = htonl(ce->ce_stat_data.sd_uid);
ondisk->gid = htonl(ce->ce_stat_data.sd_gid);
ondisk->size = htonl(ce->ce_stat_data.sd_size);
hashcpy(ondisk->data, ce->oid.hash, the_repository->hash_algo);
flags = ce->ce_flags & ~CE_NAMEMASK;
flags |= (ce_namelen(ce) >= CE_NAMEMASK ? CE_NAMEMASK : ce_namelen(ce));
flagsp[0] = htons(flags);
if (ce->ce_flags & CE_EXTENDED) {
flagsp[1] = htons((ce->ce_flags & CE_EXTENDED_FLAGS) >> 16);
}
}
static int ce_write_entry(struct hashfile *f, struct cache_entry *ce,
struct strbuf *previous_name, struct ondisk_cache_entry *ondisk)
{
int size;
unsigned int saved_namelen;
int stripped_name = 0;
static unsigned char padding[8] = { 0x00 };
if (ce->ce_flags & CE_STRIP_NAME) {
saved_namelen = ce_namelen(ce);
ce->ce_namelen = 0;
stripped_name = 1;
}
size = offsetof(struct ondisk_cache_entry,data) + ondisk_data_size(ce->ce_flags, 0);
if (!previous_name) {
int len = ce_namelen(ce);
copy_cache_entry_to_ondisk(ondisk, ce);
hashwrite(f, ondisk, size);
hashwrite(f, ce->name, len);
hashwrite(f, padding, align_padding_size(size, len));
} else {
int common, to_remove, prefix_size;
unsigned char to_remove_vi[16];
for (common = 0;
(ce->name[common] &&
common < previous_name->len &&
ce->name[common] == previous_name->buf[common]);
common++)
; /* still matching */
to_remove = previous_name->len - common;
prefix_size = encode_varint(to_remove, to_remove_vi);
copy_cache_entry_to_ondisk(ondisk, ce);
hashwrite(f, ondisk, size);
hashwrite(f, to_remove_vi, prefix_size);
hashwrite(f, ce->name + common, ce_namelen(ce) - common);
hashwrite(f, padding, 1);
strbuf_splice(previous_name, common, to_remove,
ce->name + common, ce_namelen(ce) - common);
}
if (stripped_name) {
ce->ce_namelen = saved_namelen;
ce->ce_flags &= ~CE_STRIP_NAME;
}
return 0;
}
/*
* This function verifies if index_state has the correct sha1 of the
* index file. Don't die if we have any other failure, just return 0.
*/
static int verify_index_from(const struct index_state *istate, const char *path)
{
int fd;
ssize_t n;
struct stat st;
unsigned char hash[GIT_MAX_RAWSZ];
if (!istate->initialized)
return 0;
fd = open(path, O_RDONLY);
if (fd < 0)
return 0;
if (fstat(fd, &st))
goto out;
if (st.st_size < sizeof(struct cache_header) + the_hash_algo->rawsz)
goto out;
n = pread_in_full(fd, hash, the_hash_algo->rawsz, st.st_size - the_hash_algo->rawsz);
if (n != the_hash_algo->rawsz)
goto out;
if (!hasheq(istate->oid.hash, hash, the_repository->hash_algo))
goto out;
close(fd);
return 1;
out:
close(fd);
return 0;
}
static int repo_verify_index(struct repository *repo)
{
return verify_index_from(repo->index, repo->index_file);
}
int has_racy_timestamp(struct index_state *istate)
{
int entries = istate->cache_nr;
int i;
for (i = 0; i < entries; i++) {
struct cache_entry *ce = istate->cache[i];
if (is_racy_timestamp(istate, ce))
return 1;
}
return 0;
}
void repo_update_index_if_able(struct repository *repo,
struct lock_file *lockfile)
{
if ((repo->index->cache_changed ||
has_racy_timestamp(repo->index)) &&
repo_verify_index(repo))
write_locked_index(repo->index, lockfile, COMMIT_LOCK);
else
rollback_lock_file(lockfile);
}
static int record_eoie(void)
{
int val;
if (!git_config_get_bool("index.recordendofindexentries", &val))
return val;
/*
* As a convenience, the end of index entries extension
* used for threading is written by default if the user
* explicitly requested threaded index reads.
*/
return !git_config_get_index_threads(&val) && val != 1;
}
static int record_ieot(void)
{
int val;
if (!git_config_get_bool("index.recordoffsettable", &val))
return val;
/*
* As a convenience, the offset table used for threading is
* written by default if the user explicitly requested
* threaded index reads.
*/
return !git_config_get_index_threads(&val) && val != 1;
}
enum write_extensions {
WRITE_NO_EXTENSION = 0,
WRITE_SPLIT_INDEX_EXTENSION = 1<<0,
WRITE_CACHE_TREE_EXTENSION = 1<<1,
WRITE_RESOLVE_UNDO_EXTENSION = 1<<2,
WRITE_UNTRACKED_CACHE_EXTENSION = 1<<3,
WRITE_FSMONITOR_EXTENSION = 1<<4,
};
#define WRITE_ALL_EXTENSIONS ((enum write_extensions)-1)
/*
* On success, `tempfile` is closed. If it is the temporary file
* of a `struct lock_file`, we will therefore effectively perform
* a 'close_lock_file_gently()`. Since that is an implementation
* detail of lockfiles, callers of `do_write_index()` should not
* rely on it.
*/
static int do_write_index(struct index_state *istate, struct tempfile *tempfile,
enum write_extensions write_extensions, unsigned flags)
{
uint64_t start = getnanotime();
struct hashfile *f;
git_hash_ctx *eoie_c = NULL;
struct cache_header hdr;
int i, err = 0, removed, extended, hdr_version;
struct cache_entry **cache = istate->cache;
int entries = istate->cache_nr;
struct stat st;
struct ondisk_cache_entry ondisk;
struct strbuf previous_name_buf = STRBUF_INIT, *previous_name;
int drop_cache_tree = istate->drop_cache_tree;
off_t offset;
int csum_fsync_flag;
int ieot_entries = 1;
struct index_entry_offset_table *ieot = NULL;
struct repository *r = istate->repo;
struct strbuf sb = STRBUF_INIT;
int nr, nr_threads, ret;
f = hashfd(tempfile->fd, tempfile->filename.buf);
prepare_repo_settings(r);
f->skip_hash = r->settings.index_skip_hash;
for (i = removed = extended = 0; i < entries; i++) {
if (cache[i]->ce_flags & CE_REMOVE)
removed++;
/* reduce extended entries if possible */
cache[i]->ce_flags &= ~CE_EXTENDED;
if (cache[i]->ce_flags & CE_EXTENDED_FLAGS) {
extended++;
cache[i]->ce_flags |= CE_EXTENDED;
}
}
if (!istate->version)
istate->version = get_index_format_default(r);
/* demote version 3 to version 2 when the latter suffices */
if (istate->version == 3 || istate->version == 2)
istate->version = extended ? 3 : 2;
hdr_version = istate->version;
hdr.hdr_signature = htonl(CACHE_SIGNATURE);
hdr.hdr_version = htonl(hdr_version);
hdr.hdr_entries = htonl(entries - removed);
hashwrite(f, &hdr, sizeof(hdr));
if (!HAVE_THREADS || git_config_get_index_threads(&nr_threads))
nr_threads = 1;
if (nr_threads != 1 && record_ieot()) {
int ieot_blocks, cpus;
/*
* ensure default number of ieot blocks maps evenly to the
* default number of threads that will process them leaving
* room for the thread to load the index extensions.
*/
if (!nr_threads) {
ieot_blocks = istate->cache_nr / THREAD_COST;
cpus = online_cpus();
if (ieot_blocks > cpus - 1)
ieot_blocks = cpus - 1;
} else {
ieot_blocks = nr_threads;
if (ieot_blocks > istate->cache_nr)
ieot_blocks = istate->cache_nr;
}
/*
* no reason to write out the IEOT extension if we don't
* have enough blocks to utilize multi-threading
*/
if (ieot_blocks > 1) {
ieot = xcalloc(1, sizeof(struct index_entry_offset_table)
+ (ieot_blocks * sizeof(struct index_entry_offset)));
ieot_entries = DIV_ROUND_UP(entries, ieot_blocks);
}
}
offset = hashfile_total(f);
nr = 0;
previous_name = (hdr_version == 4) ? &previous_name_buf : NULL;
for (i = 0; i < entries; i++) {
struct cache_entry *ce = cache[i];
if (ce->ce_flags & CE_REMOVE)
continue;
if (!ce_uptodate(ce) && is_racy_timestamp(istate, ce))
ce_smudge_racily_clean_entry(istate, ce);
if (is_null_oid(&ce->oid)) {
static const char msg[] = "cache entry has null sha1: %s";
static int allow = -1;
if (allow < 0)
allow = git_env_bool("GIT_ALLOW_NULL_SHA1", 0);
if (allow)
warning(msg, ce->name);
else
err = error(msg, ce->name);
drop_cache_tree = 1;
}
if (ieot && i && (i % ieot_entries == 0)) {
ieot->entries[ieot->nr].nr = nr;
ieot->entries[ieot->nr].offset = offset;
ieot->nr++;
/*
* If we have a V4 index, set the first byte to an invalid
* character to ensure there is nothing common with the previous
* entry
*/
if (previous_name)
previous_name->buf[0] = 0;
nr = 0;
offset = hashfile_total(f);
}
if (ce_write_entry(f, ce, previous_name, (struct ondisk_cache_entry *)&ondisk) < 0)
err = -1;
if (err)
break;
nr++;
}
if (ieot && nr) {
ieot->entries[ieot->nr].nr = nr;
ieot->entries[ieot->nr].offset = offset;
ieot->nr++;
}
strbuf_release(&previous_name_buf);
if (err) {
ret = err;
goto out;
}
offset = hashfile_total(f);
/*
* The extension headers must be hashed on their own for the
* EOIE extension. Create a hashfile here to compute that hash.
*/
if (offset && record_eoie()) {
CALLOC_ARRAY(eoie_c, 1);
the_hash_algo->init_fn(eoie_c);
}
/*
* Lets write out CACHE_EXT_INDEXENTRYOFFSETTABLE first so that we
* can minimize the number of extensions we have to scan through to
* find it during load. Write it out regardless of the
* strip_extensions parameter as we need it when loading the shared
* index.
*/
if (ieot) {
strbuf_reset(&sb);
write_ieot_extension(&sb, ieot);
err = write_index_ext_header(f, eoie_c, CACHE_EXT_INDEXENTRYOFFSETTABLE, sb.len) < 0;
hashwrite(f, sb.buf, sb.len);
if (err) {
ret = -1;
goto out;
}
}
if (write_extensions & WRITE_SPLIT_INDEX_EXTENSION &&
istate->split_index) {
strbuf_reset(&sb);
if (istate->sparse_index)
die(_("cannot write split index for a sparse index"));
err = write_link_extension(&sb, istate) < 0 ||
write_index_ext_header(f, eoie_c, CACHE_EXT_LINK,
sb.len) < 0;
hashwrite(f, sb.buf, sb.len);
if (err) {
ret = -1;
goto out;
}
}
if (write_extensions & WRITE_CACHE_TREE_EXTENSION &&
!drop_cache_tree && istate->cache_tree) {
strbuf_reset(&sb);
cache_tree_write(&sb, istate->cache_tree);
err = write_index_ext_header(f, eoie_c, CACHE_EXT_TREE, sb.len) < 0;
hashwrite(f, sb.buf, sb.len);
if (err) {
ret = -1;
goto out;
}
}
if (write_extensions & WRITE_RESOLVE_UNDO_EXTENSION &&
istate->resolve_undo) {
strbuf_reset(&sb);
resolve_undo_write(&sb, istate->resolve_undo);
err = write_index_ext_header(f, eoie_c, CACHE_EXT_RESOLVE_UNDO,
sb.len) < 0;
hashwrite(f, sb.buf, sb.len);
if (err) {
ret = -1;
goto out;
}
}
if (write_extensions & WRITE_UNTRACKED_CACHE_EXTENSION &&
istate->untracked) {
strbuf_reset(&sb);
write_untracked_extension(&sb, istate->untracked);
err = write_index_ext_header(f, eoie_c, CACHE_EXT_UNTRACKED,
sb.len) < 0;
hashwrite(f, sb.buf, sb.len);
if (err) {
ret = -1;
goto out;
}
}
if (write_extensions & WRITE_FSMONITOR_EXTENSION &&
istate->fsmonitor_last_update) {
strbuf_reset(&sb);
write_fsmonitor_extension(&sb, istate);
err = write_index_ext_header(f, eoie_c, CACHE_EXT_FSMONITOR, sb.len) < 0;
hashwrite(f, sb.buf, sb.len);
if (err) {
ret = -1;
goto out;
}
}
if (istate->sparse_index) {
if (write_index_ext_header(f, eoie_c, CACHE_EXT_SPARSE_DIRECTORIES, 0) < 0) {
ret = -1;
goto out;
}
}
/*
* CACHE_EXT_ENDOFINDEXENTRIES must be written as the last entry before the SHA1
* so that it can be found and processed before all the index entries are
* read. Write it out regardless of the strip_extensions parameter as we need it
* when loading the shared index.
*/
if (eoie_c) {
strbuf_reset(&sb);
write_eoie_extension(&sb, eoie_c, offset);
err = write_index_ext_header(f, NULL, CACHE_EXT_ENDOFINDEXENTRIES, sb.len) < 0;
hashwrite(f, sb.buf, sb.len);
if (err) {
ret = -1;
goto out;
}
}
csum_fsync_flag = 0;
if (!alternate_index_output && (flags & COMMIT_LOCK))
csum_fsync_flag = CSUM_FSYNC;
finalize_hashfile(f, istate->oid.hash, FSYNC_COMPONENT_INDEX,
CSUM_HASH_IN_STREAM | csum_fsync_flag);
f = NULL;
if (close_tempfile_gently(tempfile)) {
ret = error(_("could not close '%s'"), get_tempfile_path(tempfile));
goto out;
}
if (stat(get_tempfile_path(tempfile), &st)) {
ret = -1;
goto out;
}
istate->timestamp.sec = (unsigned int)st.st_mtime;
istate->timestamp.nsec = ST_MTIME_NSEC(st);
trace_performance_since(start, "write index, changed mask = %x", istate->cache_changed);
/*
* TODO trace2: replace "the_repository" with the actual repo instance
* that is associated with the given "istate".
*/
trace2_data_intmax("index", the_repository, "write/version",
istate->version);
trace2_data_intmax("index", the_repository, "write/cache_nr",
istate->cache_nr);
ret = 0;
out:
if (f)
free_hashfile(f);
strbuf_release(&sb);
free(ieot);
return ret;
}
void set_alternate_index_output(const char *name)
{
alternate_index_output = name;
}
static int commit_locked_index(struct lock_file *lk)
{
if (alternate_index_output)
return commit_lock_file_to(lk, alternate_index_output);
else
return commit_lock_file(lk);
}
static int do_write_locked_index(struct index_state *istate,
struct lock_file *lock,
unsigned flags,
enum write_extensions write_extensions)
{
int ret;
int was_full = istate->sparse_index == INDEX_EXPANDED;
ret = convert_to_sparse(istate, 0);
if (ret) {
warning(_("failed to convert to a sparse-index"));
return ret;
}
/*
* TODO trace2: replace "the_repository" with the actual repo instance
* that is associated with the given "istate".
*/
trace2_region_enter_printf("index", "do_write_index", the_repository,
"%s", get_lock_file_path(lock));
ret = do_write_index(istate, lock->tempfile, write_extensions, flags);
trace2_region_leave_printf("index", "do_write_index", the_repository,
"%s", get_lock_file_path(lock));
if (was_full)
ensure_full_index(istate);
if (ret)
return ret;
if (flags & COMMIT_LOCK)
ret = commit_locked_index(lock);
else
ret = close_lock_file_gently(lock);
run_hooks_l("post-index-change",
istate->updated_workdir ? "1" : "0",
istate->updated_skipworktree ? "1" : "0", NULL);
istate->updated_workdir = 0;
istate->updated_skipworktree = 0;
return ret;
}
static int write_split_index(struct index_state *istate,
struct lock_file *lock,
unsigned flags)
{
int ret;
prepare_to_write_split_index(istate);
ret = do_write_locked_index(istate, lock, flags, WRITE_ALL_EXTENSIONS);
finish_writing_split_index(istate);
return ret;
}
static const char *shared_index_expire = "2.weeks.ago";
static unsigned long get_shared_index_expire_date(void)
{
static unsigned long shared_index_expire_date;
static int shared_index_expire_date_prepared;
if (!shared_index_expire_date_prepared) {
git_config_get_expiry("splitindex.sharedindexexpire",
&shared_index_expire);
shared_index_expire_date = approxidate(shared_index_expire);
shared_index_expire_date_prepared = 1;
}
return shared_index_expire_date;
}
static int should_delete_shared_index(const char *shared_index_path)
{
struct stat st;
unsigned long expiration;
/* Check timestamp */
expiration = get_shared_index_expire_date();
if (!expiration)
return 0;
if (stat(shared_index_path, &st))
return error_errno(_("could not stat '%s'"), shared_index_path);
if (st.st_mtime > expiration)
return 0;
return 1;
}
static int clean_shared_index_files(const char *current_hex)
{
struct dirent *de;
DIR *dir = opendir(get_git_dir());
if (!dir)
return error_errno(_("unable to open git dir: %s"), get_git_dir());
while ((de = readdir(dir)) != NULL) {
const char *sha1_hex;
const char *shared_index_path;
if (!skip_prefix(de->d_name, "sharedindex.", &sha1_hex))
continue;
if (!strcmp(sha1_hex, current_hex))
continue;
shared_index_path = git_path("%s", de->d_name);
if (should_delete_shared_index(shared_index_path) > 0 &&
unlink(shared_index_path))
warning_errno(_("unable to unlink: %s"), shared_index_path);
}
closedir(dir);
return 0;
}
static int write_shared_index(struct index_state *istate,
struct tempfile **temp, unsigned flags)
{
struct split_index *si = istate->split_index;
int ret, was_full = !istate->sparse_index;
move_cache_to_base_index(istate);
convert_to_sparse(istate, 0);
trace2_region_enter_printf("index", "shared/do_write_index",
the_repository, "%s", get_tempfile_path(*temp));
ret = do_write_index(si->base, *temp, WRITE_NO_EXTENSION, flags);
trace2_region_leave_printf("index", "shared/do_write_index",
the_repository, "%s", get_tempfile_path(*temp));
if (was_full)
ensure_full_index(istate);
if (ret)
return ret;
ret = adjust_shared_perm(get_tempfile_path(*temp));
if (ret) {
error(_("cannot fix permission bits on '%s'"), get_tempfile_path(*temp));
return ret;
}
ret = rename_tempfile(temp,
git_path("sharedindex.%s", oid_to_hex(&si->base->oid)));
if (!ret) {
oidcpy(&si->base_oid, &si->base->oid);
clean_shared_index_files(oid_to_hex(&si->base->oid));
}
return ret;
}
static const int default_max_percent_split_change = 20;
static int too_many_not_shared_entries(struct index_state *istate)
{
int i, not_shared = 0;
int max_split = git_config_get_max_percent_split_change();
switch (max_split) {
case -1:
/* not or badly configured: use the default value */
max_split = default_max_percent_split_change;
break;
case 0:
return 1; /* 0% means always write a new shared index */
case 100:
return 0; /* 100% means never write a new shared index */
default:
break; /* just use the configured value */
}
/* Count not shared entries */
for (i = 0; i < istate->cache_nr; i++) {
struct cache_entry *ce = istate->cache[i];
if (!ce->index)
not_shared++;
}
return (int64_t)istate->cache_nr * max_split < (int64_t)not_shared * 100;
}
int write_locked_index(struct index_state *istate, struct lock_file *lock,
unsigned flags)
{
int new_shared_index, ret, test_split_index_env;
struct split_index *si = istate->split_index;
if (git_env_bool("GIT_TEST_CHECK_CACHE_TREE", 0))
cache_tree_verify(the_repository, istate);
if ((flags & SKIP_IF_UNCHANGED) && !istate->cache_changed) {
if (flags & COMMIT_LOCK)
rollback_lock_file(lock);
return 0;
}
if (istate->fsmonitor_last_update)
fill_fsmonitor_bitmap(istate);
test_split_index_env = git_env_bool("GIT_TEST_SPLIT_INDEX", 0);
if ((!si && !test_split_index_env) ||
alternate_index_output ||
(istate->cache_changed & ~EXTMASK)) {
ret = do_write_locked_index(istate, lock, flags,
~WRITE_SPLIT_INDEX_EXTENSION);
goto out;
}
if (test_split_index_env) {
if (!si) {
si = init_split_index(istate);
istate->cache_changed |= SPLIT_INDEX_ORDERED;
} else {
int v = si->base_oid.hash[0];
if ((v & 15) < 6)
istate->cache_changed |= SPLIT_INDEX_ORDERED;
}
}
if (too_many_not_shared_entries(istate))
istate->cache_changed |= SPLIT_INDEX_ORDERED;
new_shared_index = istate->cache_changed & SPLIT_INDEX_ORDERED;
if (new_shared_index) {
struct tempfile *temp;
int saved_errno;
/* Same initial permissions as the main .git/index file */
temp = mks_tempfile_sm(git_path("sharedindex_XXXXXX"), 0, 0666);
if (!temp) {
ret = do_write_locked_index(istate, lock, flags,
~WRITE_SPLIT_INDEX_EXTENSION);
goto out;
}
ret = write_shared_index(istate, &temp, flags);
saved_errno = errno;
if (is_tempfile_active(temp))
delete_tempfile(&temp);
errno = saved_errno;
if (ret)
goto out;
}
ret = write_split_index(istate, lock, flags);
/* Freshen the shared index only if the split-index was written */
if (!ret && !new_shared_index && !is_null_oid(&si->base_oid)) {
const char *shared_index = git_path("sharedindex.%s",
oid_to_hex(&si->base_oid));
freshen_shared_index(shared_index, 1);
}
out:
if (flags & COMMIT_LOCK)
rollback_lock_file(lock);
return ret;
}
/*
* Read the index file that is potentially unmerged into given
* index_state, dropping any unmerged entries to stage #0 (potentially
* resulting in a path appearing as both a file and a directory in the
* index; the caller is responsible to clear out the extra entries
* before writing the index to a tree). Returns true if the index is
* unmerged. Callers who want to refuse to work from an unmerged
* state can call this and check its return value, instead of calling
* read_cache().
*/
int repo_read_index_unmerged(struct repository *repo)
{
struct index_state *istate;
int i;
int unmerged = 0;
repo_read_index(repo);
istate = repo->index;
for (i = 0; i < istate->cache_nr; i++) {
struct cache_entry *ce = istate->cache[i];
struct cache_entry *new_ce;
int len;
if (!ce_stage(ce))
continue;
unmerged = 1;
len = ce_namelen(ce);
new_ce = make_empty_cache_entry(istate, len);
memcpy(new_ce->name, ce->name, len);
new_ce->ce_flags = create_ce_flags(0) | CE_CONFLICTED;
new_ce->ce_namelen = len;
new_ce->ce_mode = ce->ce_mode;
if (add_index_entry(istate, new_ce, ADD_CACHE_SKIP_DFCHECK))
return error(_("%s: cannot drop to stage #0"),
new_ce->name);
}
return unmerged;
}
/*
* Returns 1 if the path is an "other" path with respect to
* the index; that is, the path is not mentioned in the index at all,
* either as a file, a directory with some files in the index,
* or as an unmerged entry.
*
* We helpfully remove a trailing "/" from directories so that
* the output of read_directory can be used as-is.
*/
int index_name_is_other(struct index_state *istate, const char *name,
int namelen)
{
int pos;
if (namelen && name[namelen - 1] == '/')
namelen--;
pos = index_name_pos(istate, name, namelen);
if (0 <= pos)
return 0; /* exact match */
pos = -pos - 1;
if (pos < istate->cache_nr) {
struct cache_entry *ce = istate->cache[pos];
if (ce_namelen(ce) == namelen &&
!memcmp(ce->name, name, namelen))
return 0; /* Yup, this one exists unmerged */
}
return 1;
}
void *read_blob_data_from_index(struct index_state *istate,
const char *path, unsigned long *size)
{
int pos, len;
unsigned long sz;
enum object_type type;
void *data;
len = strlen(path);
pos = index_name_pos(istate, path, len);
if (pos < 0) {
/*
* We might be in the middle of a merge, in which
* case we would read stage #2 (ours).
*/
int i;
for (i = -pos - 1;
(pos < 0 && i < istate->cache_nr &&
!strcmp(istate->cache[i]->name, path));
i++)
if (ce_stage(istate->cache[i]) == 2)
pos = i;
}
if (pos < 0)
return NULL;
data = repo_read_object_file(the_repository, &istate->cache[pos]->oid,
&type, &sz);
if (!data || type != OBJ_BLOB) {
free(data);
return NULL;
}
if (size)
*size = sz;
return data;
}
void move_index_extensions(struct index_state *dst, struct index_state *src)
{
dst->untracked = src->untracked;
src->untracked = NULL;
dst->cache_tree = src->cache_tree;
src->cache_tree = NULL;
}
struct cache_entry *dup_cache_entry(const struct cache_entry *ce,
struct index_state *istate)
{
unsigned int size = ce_size(ce);
int mem_pool_allocated;
struct cache_entry *new_entry = make_empty_cache_entry(istate, ce_namelen(ce));
mem_pool_allocated = new_entry->mem_pool_allocated;
memcpy(new_entry, ce, size);
new_entry->mem_pool_allocated = mem_pool_allocated;
return new_entry;
}
void discard_cache_entry(struct cache_entry *ce)
{
if (ce && should_validate_cache_entries())
memset(ce, 0xCD, cache_entry_size(ce->ce_namelen));
if (ce && ce->mem_pool_allocated)
return;
free(ce);
}
int should_validate_cache_entries(void)
{
static int validate_index_cache_entries = -1;
if (validate_index_cache_entries < 0) {
if (getenv("GIT_TEST_VALIDATE_INDEX_CACHE_ENTRIES"))
validate_index_cache_entries = 1;
else
validate_index_cache_entries = 0;
}
return validate_index_cache_entries;
}
#define EOIE_SIZE (4 + GIT_SHA1_RAWSZ) /* <4-byte offset> + <20-byte hash> */
#define EOIE_SIZE_WITH_HEADER (4 + 4 + EOIE_SIZE) /* <4-byte signature> + <4-byte length> + EOIE_SIZE */
static size_t read_eoie_extension(const char *mmap, size_t mmap_size)
{
/*
* The end of index entries (EOIE) extension is guaranteed to be last
* so that it can be found by scanning backwards from the EOF.
*
* "EOIE"
* <4-byte length>
* <4-byte offset>
* <20-byte hash>
*/
const char *index, *eoie;
uint32_t extsize;
size_t offset, src_offset;
unsigned char hash[GIT_MAX_RAWSZ];
git_hash_ctx c;
/* ensure we have an index big enough to contain an EOIE extension */
if (mmap_size < sizeof(struct cache_header) + EOIE_SIZE_WITH_HEADER + the_hash_algo->rawsz)
return 0;
/* validate the extension signature */
index = eoie = mmap + mmap_size - EOIE_SIZE_WITH_HEADER - the_hash_algo->rawsz;
if (CACHE_EXT(index) != CACHE_EXT_ENDOFINDEXENTRIES)
return 0;
index += sizeof(uint32_t);
/* validate the extension size */
extsize = get_be32(index);
if (extsize != EOIE_SIZE)
return 0;
index += sizeof(uint32_t);
/*
* Validate the offset we're going to look for the first extension
* signature is after the index header and before the eoie extension.
*/
offset = get_be32(index);
if (mmap + offset < mmap + sizeof(struct cache_header))
return 0;
if (mmap + offset >= eoie)
return 0;
index += sizeof(uint32_t);
/*
* The hash is computed over extension types and their sizes (but not
* their contents). E.g. if we have "TREE" extension that is N-bytes
* long, "REUC" extension that is M-bytes long, followed by "EOIE",
* then the hash would be:
*
* SHA-1("TREE" + <binary representation of N> +
* "REUC" + <binary representation of M>)
*/
src_offset = offset;
the_hash_algo->init_fn(&c);
while (src_offset < mmap_size - the_hash_algo->rawsz - EOIE_SIZE_WITH_HEADER) {
/* 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.
*/
uint32_t extsize;
memcpy(&extsize, mmap + src_offset + 4, 4);
extsize = ntohl(extsize);
/* verify the extension size isn't so large it will wrap around */
if (src_offset + 8 + extsize < src_offset)
return 0;
the_hash_algo->update_fn(&c, mmap + src_offset, 8);
src_offset += 8;
src_offset += extsize;
}
the_hash_algo->final_fn(hash, &c);
if (!hasheq(hash, (const unsigned char *)index, the_repository->hash_algo))
return 0;
/* Validate that the extension offsets returned us back to the eoie extension. */
if (src_offset != mmap_size - the_hash_algo->rawsz - EOIE_SIZE_WITH_HEADER)
return 0;
return offset;
}
static void write_eoie_extension(struct strbuf *sb, git_hash_ctx *eoie_context, size_t offset)
{
uint32_t buffer;
unsigned char hash[GIT_MAX_RAWSZ];
/* offset */
put_be32(&buffer, offset);
strbuf_add(sb, &buffer, sizeof(uint32_t));
/* hash */
the_hash_algo->final_fn(hash, eoie_context);
strbuf_add(sb, hash, the_hash_algo->rawsz);
}
#define IEOT_VERSION (1)
static struct index_entry_offset_table *read_ieot_extension(const char *mmap, size_t mmap_size, size_t offset)
{
const char *index = NULL;
uint32_t extsize, ext_version;
struct index_entry_offset_table *ieot;
int i, nr;
/* find the IEOT extension */
if (!offset)
return NULL;
while (offset <= mmap_size - the_hash_algo->rawsz - 8) {
extsize = get_be32(mmap + offset + 4);
if (CACHE_EXT((mmap + offset)) == CACHE_EXT_INDEXENTRYOFFSETTABLE) {
index = mmap + offset + 4 + 4;
break;
}
offset += 8;
offset += extsize;
}
if (!index)
return NULL;
/* validate the version is IEOT_VERSION */
ext_version = get_be32(index);
if (ext_version != IEOT_VERSION) {
error("invalid IEOT version %d", ext_version);
return NULL;
}
index += sizeof(uint32_t);
/* extension size - version bytes / bytes per entry */
nr = (extsize - sizeof(uint32_t)) / (sizeof(uint32_t) + sizeof(uint32_t));
if (!nr) {
error("invalid number of IEOT entries %d", nr);
return NULL;
}
ieot = xmalloc(sizeof(struct index_entry_offset_table)
+ (nr * sizeof(struct index_entry_offset)));
ieot->nr = nr;
for (i = 0; i < nr; i++) {
ieot->entries[i].offset = get_be32(index);
index += sizeof(uint32_t);
ieot->entries[i].nr = get_be32(index);
index += sizeof(uint32_t);
}
return ieot;
}
static void write_ieot_extension(struct strbuf *sb, struct index_entry_offset_table *ieot)
{
uint32_t buffer;
int i;
/* version */
put_be32(&buffer, IEOT_VERSION);
strbuf_add(sb, &buffer, sizeof(uint32_t));
/* ieot */
for (i = 0; i < ieot->nr; i++) {
/* offset */
put_be32(&buffer, ieot->entries[i].offset);
strbuf_add(sb, &buffer, sizeof(uint32_t));
/* count */
put_be32(&buffer, ieot->entries[i].nr);
strbuf_add(sb, &buffer, sizeof(uint32_t));
}
}
void prefetch_cache_entries(const struct index_state *istate,
must_prefetch_predicate must_prefetch)
{
int i;
struct oid_array to_fetch = OID_ARRAY_INIT;
for (i = 0; i < istate->cache_nr; i++) {
struct cache_entry *ce = istate->cache[i];
if (S_ISGITLINK(ce->ce_mode) || !must_prefetch(ce))
continue;
if (!oid_object_info_extended(the_repository, &ce->oid,
NULL,
OBJECT_INFO_FOR_PREFETCH))
continue;
oid_array_append(&to_fetch, &ce->oid);
}
promisor_remote_get_direct(the_repository,
to_fetch.oid, to_fetch.nr);
oid_array_clear(&to_fetch);
}
static int read_one_entry_opt(struct index_state *istate,
const struct object_id *oid,
struct strbuf *base,
const char *pathname,
unsigned mode, int opt)
{
int len;
struct cache_entry *ce;
if (S_ISDIR(mode))
return READ_TREE_RECURSIVE;
len = strlen(pathname);
ce = make_empty_cache_entry(istate, base->len + len);
ce->ce_mode = create_ce_mode(mode);
ce->ce_flags = create_ce_flags(1);
ce->ce_namelen = base->len + len;
memcpy(ce->name, base->buf, base->len);
memcpy(ce->name + base->len, pathname, len+1);
oidcpy(&ce->oid, oid);
return add_index_entry(istate, ce, opt);
}
static int read_one_entry(const struct object_id *oid, struct strbuf *base,
const char *pathname, unsigned mode,
void *context)
{
struct index_state *istate = context;
return read_one_entry_opt(istate, oid, base, pathname,
mode,
ADD_CACHE_OK_TO_ADD|ADD_CACHE_SKIP_DFCHECK);
}
/*
* This is used when the caller knows there is no existing entries at
* the stage that will conflict with the entry being added.
*/
static int read_one_entry_quick(const struct object_id *oid, struct strbuf *base,
const char *pathname, unsigned mode,
void *context)
{
struct index_state *istate = context;
return read_one_entry_opt(istate, oid, base, pathname,
mode, ADD_CACHE_JUST_APPEND);
}
/*
* Read the tree specified with --with-tree option
* (typically, HEAD) into stage #1 and then
* squash them down to stage #0. This is used for
* --error-unmatch to list and check the path patterns
* that were given from the command line. We are not
* going to write this index out.
*/
void overlay_tree_on_index(struct index_state *istate,
const char *tree_name, const char *prefix)
{
struct tree *tree;
struct object_id oid;
struct pathspec pathspec;
struct cache_entry *last_stage0 = NULL;
int i;
read_tree_fn_t fn = NULL;
int err;
if (repo_get_oid(the_repository, tree_name, &oid))
die("tree-ish %s not found.", tree_name);
tree = parse_tree_indirect(&oid);
if (!tree)
die("bad tree-ish %s", tree_name);
/* Hoist the unmerged entries up to stage #3 to make room */
/* TODO: audit for interaction with sparse-index. */
ensure_full_index(istate);
for (i = 0; i < istate->cache_nr; i++) {
struct cache_entry *ce = istate->cache[i];
if (!ce_stage(ce))
continue;
ce->ce_flags |= CE_STAGEMASK;
}
if (prefix) {
static const char *(matchbuf[1]);
matchbuf[0] = NULL;
parse_pathspec(&pathspec, PATHSPEC_ALL_MAGIC,
PATHSPEC_PREFER_CWD, prefix, matchbuf);
} else
memset(&pathspec, 0, sizeof(pathspec));
/*
* See if we have cache entry at the stage. If so,
* do it the original slow way, otherwise, append and then
* sort at the end.
*/
for (i = 0; !fn && i < istate->cache_nr; i++) {
const struct cache_entry *ce = istate->cache[i];
if (ce_stage(ce) == 1)
fn = read_one_entry;
}
if (!fn)
fn = read_one_entry_quick;
err = read_tree(the_repository, tree, &pathspec, fn, istate);
clear_pathspec(&pathspec);
if (err)
die("unable to read tree entries %s", tree_name);
/*
* Sort the cache entry -- we need to nuke the cache tree, though.
*/
if (fn == read_one_entry_quick) {
cache_tree_free(&istate->cache_tree);
QSORT(istate->cache, istate->cache_nr, cmp_cache_name_compare);
}
for (i = 0; i < istate->cache_nr; i++) {
struct cache_entry *ce = istate->cache[i];
switch (ce_stage(ce)) {
case 0:
last_stage0 = ce;
/* fallthru */
default:
continue;
case 1:
/*
* If there is stage #0 entry for this, we do not
* need to show it. We use CE_UPDATE bit to mark
* such an entry.
*/
if (last_stage0 &&
!strcmp(last_stage0->name, ce->name))
ce->ce_flags |= CE_UPDATE;
}
}
}
struct update_callback_data {
struct index_state *index;
int include_sparse;
int flags;
int add_errors;
};
static int fix_unmerged_status(struct diff_filepair *p,
struct update_callback_data *data)
{
if (p->status != DIFF_STATUS_UNMERGED)
return p->status;
if (!(data->flags & ADD_CACHE_IGNORE_REMOVAL) && !p->two->mode)
/*
* This is not an explicit add request, and the
* path is missing from the working tree (deleted)
*/
return DIFF_STATUS_DELETED;
else
/*
* Either an explicit add request, or path exists
* in the working tree. An attempt to explicitly
* add a path that does not exist in the working tree
* will be caught as an error by the caller immediately.
*/
return DIFF_STATUS_MODIFIED;
}
static void update_callback(struct diff_queue_struct *q,
struct diff_options *opt UNUSED, void *cbdata)
{
int i;
struct update_callback_data *data = cbdata;
for (i = 0; i < q->nr; i++) {
struct diff_filepair *p = q->queue[i];
const char *path = p->one->path;
if (!data->include_sparse &&
!path_in_sparse_checkout(path, data->index))
continue;
switch (fix_unmerged_status(p, data)) {
default:
die(_("unexpected diff status %c"), p->status);
case DIFF_STATUS_MODIFIED:
case DIFF_STATUS_TYPE_CHANGED:
if (add_file_to_index(data->index, path, data->flags)) {
if (!(data->flags & ADD_CACHE_IGNORE_ERRORS))
die(_("updating files failed"));
data->add_errors++;
}
break;
case DIFF_STATUS_DELETED:
if (data->flags & ADD_CACHE_IGNORE_REMOVAL)
break;
if (!(data->flags & ADD_CACHE_PRETEND))
remove_file_from_index(data->index, path);
if (data->flags & (ADD_CACHE_PRETEND|ADD_CACHE_VERBOSE))
printf(_("remove '%s'\n"), path);
break;
}
}
}
int add_files_to_cache(struct repository *repo, const char *prefix,
const struct pathspec *pathspec, char *ps_matched,
int include_sparse, int flags)
{
struct update_callback_data data;
struct rev_info rev;
memset(&data, 0, sizeof(data));
data.index = repo->index;
data.include_sparse = include_sparse;
data.flags = flags;
repo_init_revisions(repo, &rev, prefix);
setup_revisions(0, NULL, &rev, NULL);
if (pathspec) {
copy_pathspec(&rev.prune_data, pathspec);
rev.ps_matched = ps_matched;
}
rev.diffopt.output_format = DIFF_FORMAT_CALLBACK;
rev.diffopt.format_callback = update_callback;
rev.diffopt.format_callback_data = &data;
rev.diffopt.flags.override_submodule_config = 1;
rev.max_count = 0; /* do not compare unmerged paths with stage #2 */
/*
* Use an ODB transaction to optimize adding multiple objects.
* This function is invoked from commands other than 'add', which
* may not have their own transaction active.
*/
begin_odb_transaction();
run_diff_files(&rev, DIFF_RACY_IS_MODIFIED);
end_odb_transaction();
release_revisions(&rev);
return !!data.add_errors;
}
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