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Add git-symbolic-ref

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This adds the counterpart of git-update-ref that lets you read
and create "symbolic refs".  By default it uses a symbolic link
to represent ".git/HEAD -> refs/heads/master", but it can be compiled
to use the textfile symbolic ref.

The places that did 'readlink .git/HEAD' and 'ln -s refs/heads/blah
.git/HEAD' have been converted to use new git-symbolic-ref command, so
that they can deal with either implementation.

Signed-off-by: Junio C Hamano <junio@twinsun.com>
This commit is contained in:
Junio C Hamano
2005-09-30 14:26:57 -07:00
committed by Junio C Hamano
parent a876ed83be
commit 8098a178b2
16 changed files with 175 additions and 56 deletions
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26
fsck-objects.c
View File

@ -402,25 +402,17 @@ static void fsck_object_dir(const char *path)
static int fsck_head_link(void)
{
int fd, count;
char hex[40];
unsigned char sha1[20];
static char path[PATH_MAX], link[PATH_MAX];
const char *git_dir = get_git_dir();
const char *git_HEAD = strdup(git_path("HEAD"));
const char *git_refs_heads_master = resolve_ref(git_HEAD, sha1, 1);
int pfxlen = strlen(git_HEAD) - 4; /* strip .../.git/ part */
snprintf(path, sizeof(path), "%s/HEAD", git_dir);
if (readlink(path, link, sizeof(link)) < 0)
return error("HEAD is not a symlink");
if (strncmp("refs/heads/", link, 11))
return error("HEAD points to something strange (%s)", link);
fd = open(path, O_RDONLY);
if (fd < 0)
return error("HEAD: %s", strerror(errno));
count = read(fd, hex, sizeof(hex));
close(fd);
if (count < 0)
return error("HEAD: %s", strerror(errno));
if (count < 40 || get_sha1_hex(hex, sha1))
if (!git_refs_heads_master)
return error("HEAD is not a symbolic ref");
if (strncmp(git_refs_heads_master + pfxlen, "refs/heads/", 11))
return error("HEAD points to something strange (%s)",
git_refs_heads_master + pfxlen);
if (!memcmp(null_sha1, sha1, 20))
return error("HEAD: not a valid git pointer");
return 0;
}