From af13cdf298b927d171a58ec30c885d2a9c9bf727 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Fri, 28 Oct 2005 12:41:49 -0700 Subject: [PATCH] Be more careful about reference parsing This does two things: - we don't allow "." and ".." as components of a refname. Thus get_sha1() will not accept "./refname" as being the same as "refname" any more. - git-rev-parse stops doing revision translation after seeing a pathname, to match the brhaviour of all the tools (once we see a pathname, everything else will also be parsed as a pathname). Basically, if you did git log * and "gitk" was somewhere in the "*", we don't want to replace the filename "gitk" with the SHA1 of the branch with the same name. Of course, if there is any change of ambiguity, you should always use "--" to make it explicit what are filenames and what are revisions, but this makes the normal cases sane. The refname rule also means that instead of the "--", you can do the same thing we're used to doing with filenames that start with a slash: use "./filename" instead, and now it's a filename, not an option (and not a revision). So "git log ./*.c" is now actually a perfectly valid thing to do, even if the first C-file might have the same name as a branch. Trivial test: git-rev-parse gitk ./gitk gitk should output something like 9843c3074dfbf57117565f6b7c93e3e6812857ee ./gitk gitk where the "./gitk" isn't seen as a revision, and the second "gitk" is a filename simply because we've seen filenames already, and thus stopped doing revision parsing. Signed-off-by: Linus Torvalds Signed-off-by: Junio C Hamano --- rev-parse.c | 1 + sha1_name.c | 27 +++++++++++++++++++++++++++ 2 files changed, 28 insertions(+) diff --git a/rev-parse.c b/rev-parse.c index adfc68c9b..169d0cc9b 100644 --- a/rev-parse.c +++ b/rev-parse.c @@ -292,6 +292,7 @@ int main(int argc, char **argv) } if (verify) die("Needed a single revision"); + as_is = 1; show_file(arg); } show_default(); diff --git a/sha1_name.c b/sha1_name.c index cc320d3d7..fe409fbce 100644 --- a/sha1_name.c +++ b/sha1_name.c @@ -203,6 +203,29 @@ const char *find_unique_abbrev(const unsigned char *sha1, int len) return NULL; } +static int ambiguous_path(const char *path) +{ + int slash = 1; + + for (;;) { + switch (*path++) { + case '\0': + break; + case '/': + if (slash) + break; + slash = 1; + continue; + case '.': + continue; + default: + slash = 0; + continue; + } + return slash; + } +} + static int get_sha1_basic(const char *str, int len, unsigned char *sha1) { static const char *prefix[] = { @@ -217,6 +240,10 @@ static int get_sha1_basic(const char *str, int len, unsigned char *sha1) if (len == 40 && !get_sha1_hex(str, sha1)) return 0; + /* Accept only unambiguous ref paths. */ + if (ambiguous_path(str)) + return -1; + for (p = prefix; *p; p++) { char *pathname = git_path("%s/%.*s", *p, len, str); if (!read_ref(pathname, sha1)) -- 2.30.2