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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"
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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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"git symbolic-ref [options] name [ref]",
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NULL
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};
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static void check_symref(const char *HEAD, int quiet)
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{
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unsigned char sha1[20];
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int flag;
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const char *refs_heads_master = resolve_ref(HEAD, sha1, 0, &flag);
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if (!refs_heads_master)
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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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exit(1);
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}
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puts(refs_heads_master);
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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;
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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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OPT_STRING('m', NULL, &msg, "reason", "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, options, 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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switch (argc) {
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case 1:
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check_symref(argv[0], quiet);
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break;
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case 2:
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if (!strcmp(argv[0], "HEAD") &&
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prefixcmp(argv[1], "refs/heads/"))
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die("Refusing to point HEAD outside of refs/heads/");
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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 0;
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}
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