mirror of
https://github.com/git/git.git
synced 2024-11-17 14:34:49 +01:00
afe5d3d516
When calling "git symbolic-ref" it is easy to forget that the target must be a fully qualified ref. E.g., you might accidentally do: $ git symbolic-ref HEAD master Unfortunately, this is very difficult to recover from, because the bogus contents of HEAD make git believe we are no longer in a git repository (as is_git_dir explicitly checks for "^refs/heads/" in the HEAD target). So immediately trying to fix the situation doesn't work: $ git symbolic-ref HEAD refs/heads/master fatal: Not a git repository and one is left editing the .git/HEAD file manually. Furthermore, one might be tempted to use symbolic-ref to set up a detached HEAD: $ git symbolic-ref HEAD `git rev-parse HEAD` which sets up an even more bogus HEAD: $ cat .git/HEAD ref: 1a9ace4f2ad4176148e61b5a85cd63d5604aac6d This patch introduces a small safety valve to prevent the specific case of anything not starting with refs/heads/ to go into HEAD. The scope of the safety valve is intentionally very limited, to make sure that we are not preventing any behavior that would otherwise be valid (like pointing a different symref than HEAD outside of refs/heads/). Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
56 lines
1.3 KiB
C
56 lines
1.3 KiB
C
#include "builtin.h"
|
|
#include "cache.h"
|
|
#include "refs.h"
|
|
#include "parse-options.h"
|
|
|
|
static const char * const git_symbolic_ref_usage[] = {
|
|
"git symbolic-ref [options] name [ref]",
|
|
NULL
|
|
};
|
|
|
|
static void check_symref(const char *HEAD, int quiet)
|
|
{
|
|
unsigned char sha1[20];
|
|
int flag;
|
|
const char *refs_heads_master = resolve_ref(HEAD, sha1, 0, &flag);
|
|
|
|
if (!refs_heads_master)
|
|
die("No such ref: %s", HEAD);
|
|
else if (!(flag & REF_ISSYMREF)) {
|
|
if (!quiet)
|
|
die("ref %s is not a symbolic ref", HEAD);
|
|
else
|
|
exit(1);
|
|
}
|
|
puts(refs_heads_master);
|
|
}
|
|
|
|
int cmd_symbolic_ref(int argc, const char **argv, const char *prefix)
|
|
{
|
|
int quiet = 0;
|
|
const char *msg = NULL;
|
|
struct option options[] = {
|
|
OPT__QUIET(&quiet),
|
|
OPT_STRING('m', NULL, &msg, "reason", "reason of the update"),
|
|
OPT_END(),
|
|
};
|
|
|
|
git_config(git_default_config, NULL);
|
|
argc = parse_options(argc, argv, options, git_symbolic_ref_usage, 0);
|
|
if (msg &&!*msg)
|
|
die("Refusing to perform update with empty message");
|
|
switch (argc) {
|
|
case 1:
|
|
check_symref(argv[0], quiet);
|
|
break;
|
|
case 2:
|
|
if (!strcmp(argv[0], "HEAD") &&
|
|
prefixcmp(argv[1], "refs/heads/"))
|
|
die("Refusing to point HEAD outside of refs/heads/");
|
|
create_symref(argv[0], argv[1], msg);
|
|
break;
|
|
default:
|
|
usage_with_options(git_symbolic_ref_usage, options);
|
|
}
|
|
return 0;
|
|
}
|