mirrors/git
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Use resolve_ref() to implement read_ref().

Browse Source 
Symbolic refs are understood by resolve_ref(), so existing read_ref()
users will automatically understand them as well.

Signed-off-by: Junio C Hamano <junio@twinsun.com>
This commit is contained in:
Junio C Hamano
2005-09-30 14:08:25 -07:00
committed by Junio C Hamano
parent ca8db1424d
commit a876ed83be
3 changed files with 69 additions and 93 deletions
Download Patch File Download Diff File Expand all files Collapse all files

62
update-ref.c
View File

@ -4,66 +4,6 @@
static const char git_update_ref_usage[] = "git-update-ref <refname> <value> [<oldval>]";
#define MAXDEPTH 5
static const char *resolve_ref(const char *path, unsigned char *sha1)
{
int depth = MAXDEPTH, len;
char buffer[256];
for (;;) {
struct stat st;
char *buf;
int fd;
if (--depth < 0)
return NULL;
/* Special case: non-existing file */
if (lstat(path, &st) < 0) {
if (errno != ENOENT)
return NULL;
memset(sha1, 0, 20);
return path;
}
/* Follow "normalized" - ie "refs/.." symlinks by hand */
if (S_ISLNK(st.st_mode)) {
len = readlink(path, buffer, sizeof(buffer)-1);
if (len >= 5 && !memcmp("refs/", buffer, 5)) {
path = git_path("%.*s", len, buffer);
continue;
}
}
/*
* Anything else, just open it and try to use it as
* a ref
*/
fd = open(path, O_RDONLY);
if (fd < 0)
return NULL;
len = read(fd, buffer, sizeof(buffer)-1);
close(fd);
/*
* Is it a symbolic ref?
*/
if (len < 4 || memcmp("ref:", buffer, 4))
break;
buf = buffer + 4;
len -= 4;
while (len && isspace(*buf))
buf++, len--;
while (len && isspace(buf[len-1]))
buf[--len] = 0;
path = git_path("%.*s", len, buf);
}
if (len < 40 || get_sha1_hex(buffer, sha1))
return NULL;
return path;
}
static int re_verify(const char *path, unsigned char *oldsha1, unsigned char *currsha1)
{
char buf[40];
@ -97,7 +37,7 @@ int main(int argc, char **argv)
if (oldval && get_sha1(oldval, oldsha1) < 0)
die("%s: not a valid old SHA1", oldval);
path = resolve_ref(git_path("%s", refname), currsha1);
path = resolve_ref(git_path("%s", refname), currsha1, !!oldval);
if (!path)
die("No such ref: %s", refname);