mirror of
https://github.com/git/git
synced 2024-08-27 19:49:21 +00:00
![Nathaniel W Filardo](/assets/img/avatar_default.png)
On big endian platforms with 8-byte unsigned long, the code reads the size of the index extension section (which is a 4-byte network byte order integer) incorrectly. Signed-off-by: Junio C Hamano <gitster@pobox.com>
1232 lines
31 KiB
C
1232 lines
31 KiB
C
/*
|
|
* GIT - The information manager from hell
|
|
*
|
|
* Copyright (C) Linus Torvalds, 2005
|
|
*/
|
|
#define NO_THE_INDEX_COMPATIBILITY_MACROS
|
|
#include "cache.h"
|
|
#include "cache-tree.h"
|
|
#include "refs.h"
|
|
#include "dir.h"
|
|
|
|
/* Index extensions.
|
|
*
|
|
* The first letter should be 'A'..'Z' for extensions that are not
|
|
* necessary for a correct operation (i.e. optimization data).
|
|
* When new extensions are added that _needs_ to be understood in
|
|
* order to correctly interpret the index file, pick character that
|
|
* is outside the range, to cause the reader to abort.
|
|
*/
|
|
|
|
#define CACHE_EXT(s) ( (s[0]<<24)|(s[1]<<16)|(s[2]<<8)|(s[3]) )
|
|
#define CACHE_EXT_TREE 0x54524545 /* "TREE" */
|
|
|
|
struct index_state the_index;
|
|
|
|
/*
|
|
* 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 cache_entry *ce, struct stat *st)
|
|
{
|
|
ce->ce_ctime = st->st_ctime;
|
|
ce->ce_mtime = st->st_mtime;
|
|
ce->ce_dev = st->st_dev;
|
|
ce->ce_ino = st->st_ino;
|
|
ce->ce_uid = st->st_uid;
|
|
ce->ce_gid = st->st_gid;
|
|
ce->ce_size = st->st_size;
|
|
|
|
if (assume_unchanged)
|
|
ce->ce_flags |= CE_VALID;
|
|
}
|
|
|
|
static int ce_compare_data(struct cache_entry *ce, struct stat *st)
|
|
{
|
|
int match = -1;
|
|
int fd = open(ce->name, O_RDONLY);
|
|
|
|
if (fd >= 0) {
|
|
unsigned char sha1[20];
|
|
if (!index_fd(sha1, fd, st, 0, OBJ_BLOB, ce->name))
|
|
match = hashcmp(sha1, ce->sha1);
|
|
/* index_fd() closed the file descriptor already */
|
|
}
|
|
return match;
|
|
}
|
|
|
|
static int ce_compare_link(struct cache_entry *ce, size_t expected_size)
|
|
{
|
|
int match = -1;
|
|
char *target;
|
|
void *buffer;
|
|
unsigned long size;
|
|
enum object_type type;
|
|
int len;
|
|
|
|
target = xmalloc(expected_size);
|
|
len = readlink(ce->name, target, expected_size);
|
|
if (len != expected_size) {
|
|
free(target);
|
|
return -1;
|
|
}
|
|
buffer = read_sha1_file(ce->sha1, &type, &size);
|
|
if (!buffer) {
|
|
free(target);
|
|
return -1;
|
|
}
|
|
if (size == expected_size)
|
|
match = memcmp(buffer, target, size);
|
|
free(buffer);
|
|
free(target);
|
|
return match;
|
|
}
|
|
|
|
static int ce_compare_gitlink(struct cache_entry *ce)
|
|
{
|
|
unsigned char sha1[20];
|
|
|
|
/*
|
|
* 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 (resolve_gitlink_ref(ce->name, "HEAD", sha1) < 0)
|
|
return 0;
|
|
return hashcmp(sha1, ce->sha1);
|
|
}
|
|
|
|
static int ce_modified_check_fs(struct cache_entry *ce, struct stat *st)
|
|
{
|
|
switch (st->st_mode & S_IFMT) {
|
|
case S_IFREG:
|
|
if (ce_compare_data(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 0;
|
|
default:
|
|
return TYPE_CHANGED;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int ce_match_stat_basic(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:
|
|
if (!S_ISDIR(st->st_mode))
|
|
changed |= TYPE_CHANGED;
|
|
else if (ce_compare_gitlink(ce))
|
|
changed |= DATA_CHANGED;
|
|
return changed;
|
|
default:
|
|
die("internal error: ce_mode is %o", ce->ce_mode);
|
|
}
|
|
if (ce->ce_mtime != (unsigned int) st->st_mtime)
|
|
changed |= MTIME_CHANGED;
|
|
if (ce->ce_ctime != (unsigned int) st->st_ctime)
|
|
changed |= CTIME_CHANGED;
|
|
|
|
if (ce->ce_uid != (unsigned int) st->st_uid ||
|
|
ce->ce_gid != (unsigned int) st->st_gid)
|
|
changed |= OWNER_CHANGED;
|
|
if (ce->ce_ino != (unsigned int) st->st_ino)
|
|
changed |= INODE_CHANGED;
|
|
|
|
#ifdef USE_STDEV
|
|
/*
|
|
* st_dev breaks on network filesystems where different
|
|
* clients will have different views of what "device"
|
|
* the filesystem is on
|
|
*/
|
|
if (ce->ce_dev != (unsigned int) st->st_dev)
|
|
changed |= INODE_CHANGED;
|
|
#endif
|
|
|
|
if (ce->ce_size != (unsigned int) st->st_size)
|
|
changed |= DATA_CHANGED;
|
|
|
|
return changed;
|
|
}
|
|
|
|
int ie_match_stat(struct index_state *istate,
|
|
struct cache_entry *ce, struct stat *st,
|
|
unsigned int options)
|
|
{
|
|
unsigned int changed;
|
|
int ignore_valid = options & CE_MATCH_IGNORE_VALID;
|
|
int assume_racy_is_modified = options & CE_MATCH_RACY_IS_DIRTY;
|
|
|
|
/*
|
|
* If it's marked as always valid in the index, it's
|
|
* valid whatever the checked-out copy says.
|
|
*/
|
|
if (!ignore_valid && (ce->ce_flags & CE_VALID))
|
|
return 0;
|
|
|
|
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 &&
|
|
istate->timestamp &&
|
|
istate->timestamp <= ce->ce_mtime) {
|
|
if (assume_racy_is_modified)
|
|
changed |= DATA_CHANGED;
|
|
else
|
|
changed |= ce_modified_check_fs(ce, st);
|
|
}
|
|
|
|
return changed;
|
|
}
|
|
|
|
int ie_modified(struct index_state *istate,
|
|
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. For other cases the ce_size
|
|
* should match the SHA1 recorded in the index entry.
|
|
*/
|
|
if ((changed & DATA_CHANGED) && ce->ce_size != 0)
|
|
return changed;
|
|
|
|
changed_fs = ce_modified_check_fs(ce, st);
|
|
if (changed_fs)
|
|
return changed | changed_fs;
|
|
return 0;
|
|
}
|
|
|
|
int base_name_compare(const char *name1, int len1, int mode1,
|
|
const char *name2, int len2, int mode2)
|
|
{
|
|
unsigned char c1, c2;
|
|
int len = len1 < len2 ? len1 : len2;
|
|
int cmp;
|
|
|
|
cmp = memcmp(name1, name2, len);
|
|
if (cmp)
|
|
return cmp;
|
|
c1 = name1[len];
|
|
c2 = name2[len];
|
|
if (!c1 && S_ISDIR(mode1))
|
|
c1 = '/';
|
|
if (!c2 && S_ISDIR(mode2))
|
|
c2 = '/';
|
|
return (c1 < c2) ? -1 : (c1 > c2) ? 1 : 0;
|
|
}
|
|
|
|
int cache_name_compare(const char *name1, int flags1, const char *name2, int flags2)
|
|
{
|
|
int len1 = flags1 & CE_NAMEMASK;
|
|
int len2 = flags2 & CE_NAMEMASK;
|
|
int len = len1 < len2 ? len1 : len2;
|
|
int cmp;
|
|
|
|
cmp = memcmp(name1, name2, len);
|
|
if (cmp)
|
|
return cmp;
|
|
if (len1 < len2)
|
|
return -1;
|
|
if (len1 > len2)
|
|
return 1;
|
|
|
|
/* Compare stages */
|
|
flags1 &= CE_STAGEMASK;
|
|
flags2 &= CE_STAGEMASK;
|
|
|
|
if (flags1 < flags2)
|
|
return -1;
|
|
if (flags1 > flags2)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
int index_name_pos(struct index_state *istate, const char *name, int namelen)
|
|
{
|
|
int first, last;
|
|
|
|
first = 0;
|
|
last = istate->cache_nr;
|
|
while (last > first) {
|
|
int next = (last + first) >> 1;
|
|
struct cache_entry *ce = istate->cache[next];
|
|
int cmp = cache_name_compare(name, namelen, ce->name, ce->ce_flags);
|
|
if (!cmp)
|
|
return next;
|
|
if (cmp < 0) {
|
|
last = next;
|
|
continue;
|
|
}
|
|
first = next+1;
|
|
}
|
|
return -first-1;
|
|
}
|
|
|
|
/* Remove entry, return true if there are more entries to go.. */
|
|
int remove_index_entry_at(struct index_state *istate, int pos)
|
|
{
|
|
istate->cache_changed = 1;
|
|
istate->cache_nr--;
|
|
if (pos >= istate->cache_nr)
|
|
return 0;
|
|
memmove(istate->cache + pos,
|
|
istate->cache + pos + 1,
|
|
(istate->cache_nr - pos) * sizeof(struct cache_entry *));
|
|
return 1;
|
|
}
|
|
|
|
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->cache_tree, 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;
|
|
}
|
|
|
|
int add_file_to_index(struct index_state *istate, const char *path, int verbose)
|
|
{
|
|
int size, namelen, pos;
|
|
struct stat st;
|
|
struct cache_entry *ce;
|
|
unsigned ce_option = CE_MATCH_IGNORE_VALID|CE_MATCH_RACY_IS_DIRTY;
|
|
|
|
if (lstat(path, &st))
|
|
die("%s: unable to stat (%s)", path, strerror(errno));
|
|
|
|
if (!S_ISREG(st.st_mode) && !S_ISLNK(st.st_mode) && !S_ISDIR(st.st_mode))
|
|
die("%s: can only add regular files, symbolic links or git-directories", path);
|
|
|
|
namelen = strlen(path);
|
|
if (S_ISDIR(st.st_mode)) {
|
|
while (namelen && path[namelen-1] == '/')
|
|
namelen--;
|
|
}
|
|
size = cache_entry_size(namelen);
|
|
ce = xcalloc(1, size);
|
|
memcpy(ce->name, path, namelen);
|
|
ce->ce_flags = namelen;
|
|
fill_stat_cache_info(ce, &st);
|
|
|
|
if (trust_executable_bit && has_symlinks)
|
|
ce->ce_mode = create_ce_mode(st.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.st_mode);
|
|
}
|
|
|
|
pos = index_name_pos(istate, ce->name, namelen);
|
|
if (0 <= pos &&
|
|
!ce_stage(istate->cache[pos]) &&
|
|
!ie_match_stat(istate, istate->cache[pos], &st, ce_option)) {
|
|
/* Nothing changed, really */
|
|
free(ce);
|
|
return 0;
|
|
}
|
|
|
|
if (index_path(ce->sha1, path, &st, 1))
|
|
die("unable to index file %s", path);
|
|
if (add_index_entry(istate, ce, ADD_CACHE_OK_TO_ADD|ADD_CACHE_OK_TO_REPLACE))
|
|
die("unable to add %s to index",path);
|
|
if (verbose)
|
|
printf("add '%s'\n", path);
|
|
return 0;
|
|
}
|
|
|
|
struct cache_entry *make_cache_entry(unsigned int mode,
|
|
const unsigned char *sha1, const char *path, int stage,
|
|
int refresh)
|
|
{
|
|
int size, len;
|
|
struct cache_entry *ce;
|
|
|
|
if (!verify_path(path))
|
|
return NULL;
|
|
|
|
len = strlen(path);
|
|
size = cache_entry_size(len);
|
|
ce = xcalloc(1, size);
|
|
|
|
hashcpy(ce->sha1, sha1);
|
|
memcpy(ce->name, path, len);
|
|
ce->ce_flags = create_ce_flags(len, stage);
|
|
ce->ce_mode = create_ce_mode(mode);
|
|
|
|
if (refresh)
|
|
return refresh_cache_entry(ce, 0);
|
|
|
|
return ce;
|
|
}
|
|
|
|
int ce_same_name(struct cache_entry *a, struct cache_entry *b)
|
|
{
|
|
int len = ce_namelen(a);
|
|
return ce_namelen(b) == len && !memcmp(a->name, b->name, len);
|
|
}
|
|
|
|
int ce_path_match(const struct cache_entry *ce, const char **pathspec)
|
|
{
|
|
const char *match, *name;
|
|
int len;
|
|
|
|
if (!pathspec)
|
|
return 1;
|
|
|
|
len = ce_namelen(ce);
|
|
name = ce->name;
|
|
while ((match = *pathspec++) != NULL) {
|
|
int matchlen = strlen(match);
|
|
if (matchlen > len)
|
|
continue;
|
|
if (memcmp(name, match, matchlen))
|
|
continue;
|
|
if (matchlen && name[matchlen-1] == '/')
|
|
return 1;
|
|
if (name[matchlen] == '/' || !name[matchlen])
|
|
return 1;
|
|
if (!matchlen)
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
/*
|
|
* The first character was '.', but that
|
|
* has already been discarded, we now test
|
|
* the rest.
|
|
*/
|
|
switch (*rest) {
|
|
/* "." is not allowed */
|
|
case '\0': case '/':
|
|
return 0;
|
|
|
|
/*
|
|
* ".git" followed by NUL or slash is bad. This
|
|
* shares the path end test with the ".." case.
|
|
*/
|
|
case 'g':
|
|
if (rest[1] != 'i')
|
|
break;
|
|
if (rest[2] != 't')
|
|
break;
|
|
rest += 2;
|
|
/* fallthrough */
|
|
case '.':
|
|
if (rest[1] == '\0' || rest[1] == '/')
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
int verify_path(const char *path)
|
|
{
|
|
char c;
|
|
|
|
goto inside;
|
|
for (;;) {
|
|
if (!c)
|
|
return 1;
|
|
if (c == '/') {
|
|
inside:
|
|
c = *path++;
|
|
switch (c) {
|
|
default:
|
|
continue;
|
|
case '/': case '\0':
|
|
break;
|
|
case '.':
|
|
if (verify_dotfile(path))
|
|
continue;
|
|
}
|
|
return 0;
|
|
}
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* Do we have another file with a pathname that is a proper
|
|
* subset of the name we're trying to add?
|
|
*/
|
|
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);
|
|
|
|
for (;;) {
|
|
int len;
|
|
|
|
for (;;) {
|
|
if (*--slash == '/')
|
|
break;
|
|
if (slash <= ce->name)
|
|
return retval;
|
|
}
|
|
len = slash - name;
|
|
|
|
pos = index_name_pos(istate, name, create_ce_flags(len, stage));
|
|
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 (stage || istate->cache[pos]->ce_mode) {
|
|
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 && (stage || p->ce_mode))
|
|
/* 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;
|
|
|
|
cache_tree_invalidate_path(istate->cache_tree, ce->name);
|
|
pos = index_name_pos(istate, ce->name, ce->ce_flags);
|
|
|
|
/* existing match? Just replace it. */
|
|
if (pos >= 0) {
|
|
istate->cache_changed = 1;
|
|
istate->cache[pos] = ce;
|
|
return 0;
|
|
}
|
|
pos = -pos-1;
|
|
|
|
/*
|
|
* 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(ce->name))
|
|
return -1;
|
|
|
|
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_pos(istate, ce->name, ce->ce_flags);
|
|
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 .. */
|
|
if (istate->cache_nr == istate->cache_alloc) {
|
|
istate->cache_alloc = alloc_nr(istate->cache_alloc);
|
|
istate->cache = xrealloc(istate->cache,
|
|
istate->cache_alloc * sizeof(struct cache_entry *));
|
|
}
|
|
|
|
/* Add it in.. */
|
|
istate->cache_nr++;
|
|
if (istate->cache_nr > pos + 1)
|
|
memmove(istate->cache + pos + 1,
|
|
istate->cache + pos,
|
|
(istate->cache_nr - pos - 1) * sizeof(ce));
|
|
istate->cache[pos] = ce;
|
|
istate->cache_changed = 1;
|
|
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)
|
|
{
|
|
struct stat st;
|
|
struct cache_entry *updated;
|
|
int changed, size;
|
|
int ignore_valid = options & CE_MATCH_IGNORE_VALID;
|
|
|
|
if (lstat(ce->name, &st) < 0) {
|
|
if (err)
|
|
*err = errno;
|
|
return NULL;
|
|
}
|
|
|
|
changed = ie_match_stat(istate, ce, &st, options);
|
|
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
|
|
return ce;
|
|
}
|
|
|
|
if (ie_modified(istate, ce, &st, options)) {
|
|
if (err)
|
|
*err = EINVAL;
|
|
return NULL;
|
|
}
|
|
|
|
size = ce_size(ce);
|
|
updated = xmalloc(size);
|
|
memcpy(updated, ce, size);
|
|
fill_stat_cache_info(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;
|
|
|
|
return updated;
|
|
}
|
|
|
|
int refresh_index(struct index_state *istate, unsigned int flags, const char **pathspec, char *seen)
|
|
{
|
|
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;
|
|
unsigned int options = really ? CE_MATCH_IGNORE_VALID : 0;
|
|
|
|
for (i = 0; i < istate->cache_nr; i++) {
|
|
struct cache_entry *ce, *new;
|
|
int cache_errno = 0;
|
|
|
|
ce = istate->cache[i];
|
|
if (ce_stage(ce)) {
|
|
while ((i < istate->cache_nr) &&
|
|
! strcmp(istate->cache[i]->name, ce->name))
|
|
i++;
|
|
i--;
|
|
if (allow_unmerged)
|
|
continue;
|
|
printf("%s: needs merge\n", ce->name);
|
|
has_errors = 1;
|
|
continue;
|
|
}
|
|
|
|
if (pathspec && !match_pathspec(pathspec, ce->name, strlen(ce->name), 0, seen))
|
|
continue;
|
|
|
|
new = refresh_cache_ent(istate, ce, options, &cache_errno);
|
|
if (new == ce)
|
|
continue;
|
|
if (!new) {
|
|
if (not_new && cache_errno == ENOENT)
|
|
continue;
|
|
if (really && cache_errno == EINVAL) {
|
|
/* If we are doing --really-refresh that
|
|
* means the index is not valid anymore.
|
|
*/
|
|
ce->ce_flags &= ~CE_VALID;
|
|
istate->cache_changed = 1;
|
|
}
|
|
if (quiet)
|
|
continue;
|
|
printf("%s: needs update\n", ce->name);
|
|
has_errors = 1;
|
|
continue;
|
|
}
|
|
istate->cache_changed = 1;
|
|
/* You can NOT just free istate->cache[i] here, since it
|
|
* might not be necessarily malloc()ed but can also come
|
|
* from mmap(). */
|
|
istate->cache[i] = new;
|
|
}
|
|
return has_errors;
|
|
}
|
|
|
|
struct cache_entry *refresh_cache_entry(struct cache_entry *ce, int really)
|
|
{
|
|
return refresh_cache_ent(&the_index, ce, really, NULL);
|
|
}
|
|
|
|
static int verify_hdr(struct cache_header *hdr, unsigned long size)
|
|
{
|
|
SHA_CTX c;
|
|
unsigned char sha1[20];
|
|
|
|
if (hdr->hdr_signature != htonl(CACHE_SIGNATURE))
|
|
return error("bad signature");
|
|
if (hdr->hdr_version != htonl(2))
|
|
return error("bad index version");
|
|
SHA1_Init(&c);
|
|
SHA1_Update(&c, hdr, size - 20);
|
|
SHA1_Final(sha1, &c);
|
|
if (hashcmp(sha1, (unsigned char *)hdr + size - 20))
|
|
return error("bad index file sha1 signature");
|
|
return 0;
|
|
}
|
|
|
|
static int read_index_extension(struct index_state *istate,
|
|
const char *ext, void *data, unsigned long sz)
|
|
{
|
|
switch (CACHE_EXT(ext)) {
|
|
case CACHE_EXT_TREE:
|
|
istate->cache_tree = cache_tree_read(data, sz);
|
|
break;
|
|
default:
|
|
if (*ext < 'A' || 'Z' < *ext)
|
|
return error("index uses %.4s extension, which we do not understand",
|
|
ext);
|
|
fprintf(stderr, "ignoring %.4s extension\n", ext);
|
|
break;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int read_index(struct index_state *istate)
|
|
{
|
|
return read_index_from(istate, get_index_file());
|
|
}
|
|
|
|
static void convert_from_disk(struct ondisk_cache_entry *ondisk, struct cache_entry *ce)
|
|
{
|
|
ce->ce_ctime = ntohl(ondisk->ctime.sec);
|
|
ce->ce_mtime = ntohl(ondisk->mtime.sec);
|
|
ce->ce_dev = ntohl(ondisk->dev);
|
|
ce->ce_ino = ntohl(ondisk->ino);
|
|
ce->ce_mode = ntohl(ondisk->mode);
|
|
ce->ce_uid = ntohl(ondisk->uid);
|
|
ce->ce_gid = ntohl(ondisk->gid);
|
|
ce->ce_size = ntohl(ondisk->size);
|
|
/* On-disk flags are just 16 bits */
|
|
ce->ce_flags = ntohs(ondisk->flags);
|
|
hashcpy(ce->sha1, ondisk->sha1);
|
|
memcpy(ce->name, ondisk->name, ce_namelen(ce)+1);
|
|
}
|
|
|
|
/* remember to discard_cache() before reading a different cache! */
|
|
int read_index_from(struct index_state *istate, const char *path)
|
|
{
|
|
int fd, i;
|
|
struct stat st;
|
|
unsigned long src_offset, dst_offset;
|
|
struct cache_header *hdr;
|
|
void *mmap;
|
|
size_t mmap_size;
|
|
|
|
errno = EBUSY;
|
|
if (istate->alloc)
|
|
return istate->cache_nr;
|
|
|
|
errno = ENOENT;
|
|
istate->timestamp = 0;
|
|
fd = open(path, O_RDONLY);
|
|
if (fd < 0) {
|
|
if (errno == ENOENT)
|
|
return 0;
|
|
die("index file open failed (%s)", strerror(errno));
|
|
}
|
|
|
|
if (fstat(fd, &st))
|
|
die("cannot stat the open index (%s)", strerror(errno));
|
|
|
|
errno = EINVAL;
|
|
mmap_size = xsize_t(st.st_size);
|
|
if (mmap_size < sizeof(struct cache_header) + 20)
|
|
die("index file smaller than expected");
|
|
|
|
mmap = xmmap(NULL, mmap_size, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
|
|
close(fd);
|
|
if (mmap == MAP_FAILED)
|
|
die("unable to map index file");
|
|
|
|
hdr = mmap;
|
|
if (verify_hdr(hdr, mmap_size) < 0)
|
|
goto unmap;
|
|
|
|
istate->cache_nr = ntohl(hdr->hdr_entries);
|
|
istate->cache_alloc = alloc_nr(istate->cache_nr);
|
|
istate->cache = xcalloc(istate->cache_alloc, sizeof(struct cache_entry *));
|
|
|
|
/*
|
|
* The disk format is actually larger than the in-memory format,
|
|
* due to space for nsec etc, so even though the in-memory one
|
|
* has room for a few more flags, we can allocate using the same
|
|
* index size
|
|
*/
|
|
istate->alloc = xmalloc(mmap_size);
|
|
|
|
src_offset = sizeof(*hdr);
|
|
dst_offset = 0;
|
|
for (i = 0; i < istate->cache_nr; i++) {
|
|
struct ondisk_cache_entry *disk_ce;
|
|
struct cache_entry *ce;
|
|
|
|
disk_ce = (struct ondisk_cache_entry *)((char *)mmap + src_offset);
|
|
ce = (struct cache_entry *)((char *)istate->alloc + dst_offset);
|
|
convert_from_disk(disk_ce, ce);
|
|
istate->cache[i] = ce;
|
|
|
|
src_offset += ondisk_ce_size(ce);
|
|
dst_offset += ce_size(ce);
|
|
}
|
|
istate->timestamp = st.st_mtime;
|
|
while (src_offset <= mmap_size - 20 - 8) {
|
|
/* After an array of active_nr index entries,
|
|
* there can be arbitrary number of extended
|
|
* sections, each of which is prefixed with
|
|
* extension name (4-byte) and section length
|
|
* in 4-byte network byte order.
|
|
*/
|
|
uint32_t extsize;
|
|
memcpy(&extsize, (char *)mmap + src_offset + 4, 4);
|
|
extsize = ntohl(extsize);
|
|
if (read_index_extension(istate,
|
|
(const char *) mmap + src_offset,
|
|
(char *) mmap + src_offset + 8,
|
|
extsize) < 0)
|
|
goto unmap;
|
|
src_offset += 8;
|
|
src_offset += extsize;
|
|
}
|
|
munmap(mmap, mmap_size);
|
|
return istate->cache_nr;
|
|
|
|
unmap:
|
|
munmap(mmap, mmap_size);
|
|
errno = EINVAL;
|
|
die("index file corrupt");
|
|
}
|
|
|
|
int discard_index(struct index_state *istate)
|
|
{
|
|
istate->cache_nr = 0;
|
|
istate->cache_changed = 0;
|
|
istate->timestamp = 0;
|
|
cache_tree_free(&(istate->cache_tree));
|
|
free(istate->alloc);
|
|
istate->alloc = NULL;
|
|
|
|
/* no need to throw away allocated active_cache */
|
|
return 0;
|
|
}
|
|
|
|
#define WRITE_BUFFER_SIZE 8192
|
|
static unsigned char write_buffer[WRITE_BUFFER_SIZE];
|
|
static unsigned long write_buffer_len;
|
|
|
|
static int ce_write_flush(SHA_CTX *context, int fd)
|
|
{
|
|
unsigned int buffered = write_buffer_len;
|
|
if (buffered) {
|
|
SHA1_Update(context, write_buffer, buffered);
|
|
if (write_in_full(fd, write_buffer, buffered) != buffered)
|
|
return -1;
|
|
write_buffer_len = 0;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int ce_write(SHA_CTX *context, int fd, void *data, unsigned int len)
|
|
{
|
|
while (len) {
|
|
unsigned int buffered = write_buffer_len;
|
|
unsigned int partial = WRITE_BUFFER_SIZE - buffered;
|
|
if (partial > len)
|
|
partial = len;
|
|
memcpy(write_buffer + buffered, data, partial);
|
|
buffered += partial;
|
|
if (buffered == WRITE_BUFFER_SIZE) {
|
|
write_buffer_len = buffered;
|
|
if (ce_write_flush(context, fd))
|
|
return -1;
|
|
buffered = 0;
|
|
}
|
|
write_buffer_len = buffered;
|
|
len -= partial;
|
|
data = (char *) data + partial;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int write_index_ext_header(SHA_CTX *context, int fd,
|
|
unsigned int ext, unsigned int sz)
|
|
{
|
|
ext = htonl(ext);
|
|
sz = htonl(sz);
|
|
return ((ce_write(context, fd, &ext, 4) < 0) ||
|
|
(ce_write(context, fd, &sz, 4) < 0)) ? -1 : 0;
|
|
}
|
|
|
|
static int ce_flush(SHA_CTX *context, int fd)
|
|
{
|
|
unsigned int left = write_buffer_len;
|
|
|
|
if (left) {
|
|
write_buffer_len = 0;
|
|
SHA1_Update(context, write_buffer, left);
|
|
}
|
|
|
|
/* Flush first if not enough space for SHA1 signature */
|
|
if (left + 20 > WRITE_BUFFER_SIZE) {
|
|
if (write_in_full(fd, write_buffer, left) != left)
|
|
return -1;
|
|
left = 0;
|
|
}
|
|
|
|
/* Append the SHA1 signature at the end */
|
|
SHA1_Final(write_buffer + left, context);
|
|
left += 20;
|
|
return (write_in_full(fd, write_buffer, left) != left) ? -1 : 0;
|
|
}
|
|
|
|
static void ce_smudge_racily_clean_entry(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_mtime match the index file mtime.
|
|
*/
|
|
struct stat st;
|
|
|
|
if (lstat(ce->name, &st) < 0)
|
|
return;
|
|
if (ce_match_stat_basic(ce, &st))
|
|
return;
|
|
if (ce_modified_check_fs(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_size = 0;
|
|
}
|
|
}
|
|
|
|
static int ce_write_entry(SHA_CTX *c, int fd, struct cache_entry *ce)
|
|
{
|
|
int size = ondisk_ce_size(ce);
|
|
struct ondisk_cache_entry *ondisk = xcalloc(1, size);
|
|
|
|
ondisk->ctime.sec = htonl(ce->ce_ctime);
|
|
ondisk->ctime.nsec = 0;
|
|
ondisk->mtime.sec = htonl(ce->ce_mtime);
|
|
ondisk->mtime.nsec = 0;
|
|
ondisk->dev = htonl(ce->ce_dev);
|
|
ondisk->ino = htonl(ce->ce_ino);
|
|
ondisk->mode = htonl(ce->ce_mode);
|
|
ondisk->uid = htonl(ce->ce_uid);
|
|
ondisk->gid = htonl(ce->ce_gid);
|
|
ondisk->size = htonl(ce->ce_size);
|
|
hashcpy(ondisk->sha1, ce->sha1);
|
|
ondisk->flags = htons(ce->ce_flags);
|
|
memcpy(ondisk->name, ce->name, ce_namelen(ce));
|
|
|
|
return ce_write(c, fd, ondisk, size);
|
|
}
|
|
|
|
int write_index(struct index_state *istate, int newfd)
|
|
{
|
|
SHA_CTX c;
|
|
struct cache_header hdr;
|
|
int i, err, removed;
|
|
struct cache_entry **cache = istate->cache;
|
|
int entries = istate->cache_nr;
|
|
|
|
for (i = removed = 0; i < entries; i++)
|
|
if (cache[i]->ce_flags & CE_REMOVE)
|
|
removed++;
|
|
|
|
hdr.hdr_signature = htonl(CACHE_SIGNATURE);
|
|
hdr.hdr_version = htonl(2);
|
|
hdr.hdr_entries = htonl(entries - removed);
|
|
|
|
SHA1_Init(&c);
|
|
if (ce_write(&c, newfd, &hdr, sizeof(hdr)) < 0)
|
|
return -1;
|
|
|
|
for (i = 0; i < entries; i++) {
|
|
struct cache_entry *ce = cache[i];
|
|
if (ce->ce_flags & CE_REMOVE)
|
|
continue;
|
|
if (istate->timestamp &&
|
|
istate->timestamp <= ce->ce_mtime)
|
|
ce_smudge_racily_clean_entry(ce);
|
|
if (ce_write_entry(&c, newfd, ce) < 0)
|
|
return -1;
|
|
}
|
|
|
|
/* Write extension data here */
|
|
if (istate->cache_tree) {
|
|
struct strbuf sb;
|
|
|
|
strbuf_init(&sb, 0);
|
|
cache_tree_write(&sb, istate->cache_tree);
|
|
err = write_index_ext_header(&c, newfd, CACHE_EXT_TREE, sb.len) < 0
|
|
|| ce_write(&c, newfd, sb.buf, sb.len) < 0;
|
|
strbuf_release(&sb);
|
|
if (err)
|
|
return -1;
|
|
}
|
|
return ce_flush(&c, newfd);
|
|
}
|