From 6348624010888bd2353e5cebdc2b5329490b0f6d Mon Sep 17 00:00:00 2001 From: Junio C Hamano Date: Tue, 14 Sep 2010 13:09:20 -0700 Subject: [PATCH] disallow branch names that start with a hyphen The current command line parser is overly lax in places and allows a branch whose name begins with a hyphen e.g. "-foo" to be created, but the parseopt infrastructure in general does not like to parse anything that begins with a dash as a short-hand refname. "git checkout -foo" won't work, nor will "git branch -d -foo" (even though "git branch -d -- -foo" works, it does so by mistake; we should not be taking anything but pathspecs after double-dash). All the codepaths that create a new branch ref, including the destination of "branch -m src dst", use strbuf_check_branch_ref() to validate if the given name is suitable as a branch name. Tighten it to disallow a branch that begins with a hyphen. You can still get rid of historical mistakes with $ git update-ref -d refs/heads/-foo and third-party Porcelains are free to keep using update-ref to create refs with a path component that begins with "-". Issue originally raised by Clemens Buchacher. Signed-off-by: Junio C Hamano --- strbuf.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/strbuf.c b/strbuf.c index bc3a0802e..65b4cf434 100644 --- a/strbuf.c +++ b/strbuf.c @@ -399,6 +399,8 @@ int strbuf_branchname(struct strbuf *sb, const char *name) int strbuf_check_branch_ref(struct strbuf *sb, const char *name) { strbuf_branchname(sb, name); + if (name[0] == '-') + return CHECK_REF_FORMAT_ERROR; strbuf_splice(sb, 0, 0, "refs/heads/", 11); return check_ref_format(sb->buf); } -- 2.26.2