From 9b143c6e155a8eead165b2a813b533e0f3e0018a Mon Sep 17 00:00:00 2001 From: Junio C Hamano Date: Sun, 25 Sep 2005 19:30:24 -0700 Subject: [PATCH] Teach update-ref about a symbolic ref stored in a textfile. A symbolic ref is a regular file whose contents is "ref:", followed by optional leading whitespaces, followed by a GIT_DIR relative pathname, followed by optional trailing whitespaces (the optional whitespaces are unconditionally removed, so you cannot have leading nor trailing whitespaces). This can be used in place of a traditional symbolic link .git/HEAD that usually points at "refs/heads/master". You can instead have a regular file .git/HEAD whose contents is "ref: refs/heads/master". [jc: currently the code does not enforce the symbolic ref to begin with refs/, unlike the symbolic link case. It may be worthwhile to require either case to begin with refs/ and not have any /./ nor /../ in them.] Signed-off-by: Junio C Hamano --- update-ref.c | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-) diff --git a/update-ref.c b/update-ref.c index 1863b8232..6919cead4 100644 --- a/update-ref.c +++ b/update-ref.c @@ -13,6 +13,7 @@ static const char *resolve_ref(const char *path, unsigned char *sha1) for (;;) { struct stat st; + char *buf; int fd; if (--depth < 0) @@ -44,7 +45,19 @@ static const char *resolve_ref(const char *path, unsigned char *sha1) return NULL; len = read(fd, buffer, sizeof(buffer)-1); close(fd); - break; + + /* + * 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; -- 2.30.2