04ede97211
You can feed absolute garbage to symbolic-ref as a target like:
git symbolic-ref HEAD refs/heads/foo..bar
While this doesn't technically break the repo entirely (our "is it a git
directory" detector looks only for "refs/" at the start), we would never
resolve such a ref, as the ".." is invalid within a refname.
Let's flag these as invalid at creation time to help the caller realize
that what they're asking for is bogus.
A few notes:
- We use REFNAME_ALLOW_ONELEVEL here, which lets:
git update-ref refs/heads/foo FETCH_HEAD
continue to work. It's unclear whether anybody wants to do something
so odd, but it does work now, so this is erring on the conservative
side. There's a test to make sure we didn't accidentally break this,
but don't take that test as an endorsement that it's a good idea, or
something we might not change in the future.
- The test in t4202-log.sh checks how we handle such an invalid ref on
the reading side, so it has to be updated to touch the HEAD file
directly.
- We need to keep our HEAD-specific check for "does it start with
refs/". The ALLOW_ONELEVEL flag means we won't be enforcing that for
other refs, but HEAD is special here because of the checks in
validate_headref().
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
83 lines
2.2 KiB
C
83 lines
2.2 KiB
C
#include "builtin.h"
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#include "config.h"
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#include "cache.h"
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#include "refs.h"
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#include "parse-options.h"
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static const char * const git_symbolic_ref_usage[] = {
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N_("git symbolic-ref [<options>] <name> [<ref>]"),
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N_("git symbolic-ref -d [-q] <name>"),
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NULL
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};
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static int check_symref(const char *HEAD, int quiet, int shorten, int print)
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{
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int flag;
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const char *refname = resolve_ref_unsafe(HEAD, 0, NULL, &flag);
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if (!refname)
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die("No such ref: %s", HEAD);
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else if (!(flag & REF_ISSYMREF)) {
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if (!quiet)
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die("ref %s is not a symbolic ref", HEAD);
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else
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return 1;
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}
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if (print) {
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char *to_free = NULL;
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if (shorten)
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refname = to_free = shorten_unambiguous_ref(refname, 0);
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puts(refname);
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free(to_free);
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}
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return 0;
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}
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int cmd_symbolic_ref(int argc, const char **argv, const char *prefix)
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{
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int quiet = 0, delete = 0, shorten = 0, ret = 0;
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const char *msg = NULL;
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struct option options[] = {
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OPT__QUIET(&quiet,
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N_("suppress error message for non-symbolic (detached) refs")),
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OPT_BOOL('d', "delete", &delete, N_("delete symbolic ref")),
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OPT_BOOL(0, "short", &shorten, N_("shorten ref output")),
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OPT_STRING('m', NULL, &msg, N_("reason"), N_("reason of the update")),
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OPT_END(),
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};
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git_config(git_default_config, NULL);
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argc = parse_options(argc, argv, prefix, options,
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git_symbolic_ref_usage, 0);
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if (msg && !*msg)
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die("Refusing to perform update with empty message");
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if (delete) {
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if (argc != 1)
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usage_with_options(git_symbolic_ref_usage, options);
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ret = check_symref(argv[0], 1, 0, 0);
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if (ret)
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die("Cannot delete %s, not a symbolic ref", argv[0]);
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if (!strcmp(argv[0], "HEAD"))
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die("deleting '%s' is not allowed", argv[0]);
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return delete_ref(NULL, argv[0], NULL, REF_NO_DEREF);
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}
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switch (argc) {
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case 1:
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ret = check_symref(argv[0], quiet, shorten, 1);
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break;
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case 2:
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if (!strcmp(argv[0], "HEAD") &&
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!starts_with(argv[1], "refs/"))
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die("Refusing to point HEAD outside of refs/");
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if (check_refname_format(argv[1], REFNAME_ALLOW_ONELEVEL) < 0)
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die("Refusing to set '%s' to invalid ref '%s'", argv[0], argv[1]);
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ret = !!create_symref(argv[0], argv[1], msg);
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break;
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default:
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usage_with_options(git_symbolic_ref_usage, options);
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}
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return ret;
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}
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