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[PATCH] Allow reading "symbolic refs" that point to other refs

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This extends the ref reading to understand a "symbolic ref": a ref file
that starts with "ref: " and points to another ref file, and thus
introduces the notion of ref aliases.

This is in preparation of allowing HEAD to eventually not be a symlink,
but one of these symbolic refs instead.

[jc: Linus originally required the prefix to be "ref: " five bytes
 and nothing else, but I changed it to allow and strip any number of
 leading whitespaces to match what update-ref.c does.]

Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
This commit is contained in:
Linus Torvalds
2005-09-25 09:59:37 -07:00
committed by Junio C Hamano
parent 9b143c6e15
commit ca8db1424d
3 changed files with 42 additions and 49 deletions
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17
sha1_name.c
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@ -119,21 +119,6 @@ static int get_short_sha1(const char *name, int len, unsigned char *sha1)
return -1;
}
static int get_sha1_file(const char *path, unsigned char *result)
{
char buffer[60];
int fd = open(path, O_RDONLY);
int len;
if (fd < 0)
return -1;
len = read(fd, buffer, sizeof(buffer));
close(fd);
if (len < 40)
return -1;
return get_sha1_hex(buffer, result);
}
static int get_sha1_basic(const char *str, int len, unsigned char *sha1)
{
static const char *prefix[] = {
@ -150,7 +135,7 @@ static int get_sha1_basic(const char *str, int len, unsigned char *sha1)
for (p = prefix; *p; p++) {
char *pathname = git_path("%s/%.*s", *p, len, str);
if (!get_sha1_file(pathname, sha1))
if (!read_ref(pathname, sha1))
return 0;
}