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Diffstat (limited to 'sha1_file.c')
-rw-r--r--sha1_file.c120
1 files changed, 102 insertions, 18 deletions
diff --git a/sha1_file.c b/sha1_file.c
index d77b915..59a4ed2 100644
--- a/sha1_file.c
+++ b/sha1_file.c
@@ -129,8 +129,10 @@ enum scld_error safe_create_leading_directories(char *path)
*slash = '\0';
if (!stat(path, &st)) {
/* path exists */
- if (!S_ISDIR(st.st_mode))
+ if (!S_ISDIR(st.st_mode)) {
+ errno = ENOTDIR;
ret = SCLD_EXISTS;
+ }
} else if (mkdir(path, 0777)) {
if (errno == EEXIST &&
!stat(path, &st) && S_ISDIR(st.st_mode))
@@ -158,13 +160,85 @@ enum scld_error safe_create_leading_directories(char *path)
enum scld_error safe_create_leading_directories_const(const char *path)
{
+ int save_errno;
/* path points to cache entries, so xstrdup before messing with it */
char *buf = xstrdup(path);
enum scld_error result = safe_create_leading_directories(buf);
+
+ save_errno = errno;
free(buf);
+ errno = save_errno;
return result;
}
+int raceproof_create_file(const char *path, create_file_fn fn, void *cb)
+{
+ /*
+ * The number of times we will try to remove empty directories
+ * in the way of path. This is only 1 because if another
+ * process is racily creating directories that conflict with
+ * us, we don't want to fight against them.
+ */
+ int remove_directories_remaining = 1;
+
+ /*
+ * The number of times that we will try to create the
+ * directories containing path. We are willing to attempt this
+ * more than once, because another process could be trying to
+ * clean up empty directories at the same time as we are
+ * trying to create them.
+ */
+ int create_directories_remaining = 3;
+
+ /* A scratch copy of path, filled lazily if we need it: */
+ struct strbuf path_copy = STRBUF_INIT;
+
+ int ret, save_errno;
+
+ /* Sanity check: */
+ assert(*path);
+
+retry_fn:
+ ret = fn(path, cb);
+ save_errno = errno;
+ if (!ret)
+ goto out;
+
+ if (errno == EISDIR && remove_directories_remaining-- > 0) {
+ /*
+ * A directory is in the way. Maybe it is empty; try
+ * to remove it:
+ */
+ if (!path_copy.len)
+ strbuf_addstr(&path_copy, path);
+
+ if (!remove_dir_recursively(&path_copy, REMOVE_DIR_EMPTY_ONLY))
+ goto retry_fn;
+ } else if (errno == ENOENT && create_directories_remaining-- > 0) {
+ /*
+ * Maybe the containing directory didn't exist, or
+ * maybe it was just deleted by a process that is
+ * racing with us to clean up empty directories. Try
+ * to create it:
+ */
+ enum scld_error scld_result;
+
+ if (!path_copy.len)
+ strbuf_addstr(&path_copy, path);
+
+ do {
+ scld_result = safe_create_leading_directories(path_copy.buf);
+ if (scld_result == SCLD_OK)
+ goto retry_fn;
+ } while (scld_result == SCLD_VANISHED && create_directories_remaining-- > 0);
+ }
+
+out:
+ strbuf_release(&path_copy);
+ errno = save_errno;
+ return ret;
+}
+
static void fill_sha1_path(struct strbuf *buf, const unsigned char *sha1)
{
int i;
@@ -588,7 +662,7 @@ static int freshen_file(const char *fn)
* either does not exist on disk, or has a stale mtime and may be subject to
* pruning).
*/
-static int check_and_freshen_file(const char *fn, int freshen)
+int check_and_freshen_file(const char *fn, int freshen)
{
if (access(fn, F_OK))
return 0;
@@ -1532,7 +1606,7 @@ static void mark_bad_packed_object(struct packed_git *p,
if (!hashcmp(sha1, p->bad_object_sha1 + GIT_SHA1_RAWSZ * i))
return;
p->bad_object_sha1 = xrealloc(p->bad_object_sha1,
- st_mult(GIT_SHA1_RAWSZ,
+ st_mult(GIT_MAX_RAWSZ,
st_add(p->num_bad_objects, 1)));
hashcpy(p->bad_object_sha1 + GIT_SHA1_RAWSZ * p->num_bad_objects, sha1);
p->num_bad_objects++;
@@ -2627,6 +2701,17 @@ const unsigned char *nth_packed_object_sha1(struct packed_git *p,
}
}
+const struct object_id *nth_packed_object_oid(struct object_id *oid,
+ struct packed_git *p,
+ uint32_t n)
+{
+ const unsigned char *hash = nth_packed_object_sha1(p, n);
+ if (!hash)
+ return NULL;
+ hashcpy(oid->hash, hash);
+ return oid;
+}
+
void check_pack_index_ptr(const struct packed_git *p, const void *vptr)
{
const unsigned char *ptr = vptr;
@@ -2867,7 +2952,7 @@ static int sha1_loose_object_info(const unsigned char *sha1,
if (status && oi->typep)
*oi->typep = status;
strbuf_release(&hdrbuf);
- return 0;
+ return (status < 0) ? status : 0;
}
int sha1_object_info_extended(const unsigned char *sha1, struct object_info *oi, unsigned flags)
@@ -3396,6 +3481,8 @@ int has_sha1_file_with_flags(const unsigned char *sha1, int flags)
{
struct pack_entry e;
+ if (!startup_info->have_repository)
+ return 0;
if (find_pack_entry(sha1, &e))
return 1;
if (has_loose_object(sha1))
@@ -3673,15 +3760,15 @@ static int for_each_file_in_obj_subdir(int subdir_nr,
strbuf_setlen(path, baselen);
strbuf_addf(path, "/%s", de->d_name);
- if (strlen(de->d_name) == 38) {
- char hex[41];
- unsigned char sha1[20];
+ if (strlen(de->d_name) == GIT_SHA1_HEXSZ - 2) {
+ char hex[GIT_MAX_HEXSZ+1];
+ struct object_id oid;
- snprintf(hex, sizeof(hex), "%02x%s",
- subdir_nr, de->d_name);
- if (!get_sha1_hex(hex, sha1)) {
+ xsnprintf(hex, sizeof(hex), "%02x%s",
+ subdir_nr, de->d_name);
+ if (!get_oid_hex(hex, &oid)) {
if (obj_cb) {
- r = obj_cb(sha1, path->buf, data);
+ r = obj_cb(&oid, path->buf, data);
if (r)
break;
}
@@ -3787,13 +3874,13 @@ static int for_each_object_in_pack(struct packed_git *p, each_packed_object_fn c
int r = 0;
for (i = 0; i < p->num_objects; i++) {
- const unsigned char *sha1 = nth_packed_object_sha1(p, i);
+ struct object_id oid;
- if (!sha1)
+ if (!nth_packed_object_oid(&oid, p, i))
return error("unable to get sha1 of object %u in %s",
i, p->pack_name);
- r = cb(sha1, p, i, data);
+ r = cb(&oid, p, i, data);
if (r)
break;
}
@@ -3828,7 +3915,7 @@ static int check_stream_sha1(git_zstream *stream,
const unsigned char *expected_sha1)
{
git_SHA_CTX c;
- unsigned char real_sha1[GIT_SHA1_RAWSZ];
+ unsigned char real_sha1[GIT_MAX_RAWSZ];
unsigned char buf[4096];
unsigned long total_read;
int status = Z_OK;
@@ -3885,7 +3972,6 @@ int read_loose_object(const char *path,
void **contents)
{
int ret = -1;
- int fd = -1;
void *map = NULL;
unsigned long mapsize;
git_zstream stream;
@@ -3935,7 +4021,5 @@ int read_loose_object(const char *path,
out:
if (map)
munmap(map, mapsize);
- if (fd >= 0)
- close(fd);
return ret;
}
generated by cgit v0.10.2-6-g49f6 at 2024-04-26 10:10:22 (GMT)