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12cfa792b8
If you delete the symbolic-ref HEAD from a repository, Git no longer
considers the repository valid, and even "git symbolic-ref HEAD
refs/heads/master" would not be able to recover from that state
(although "git init" can, but that is a sure sign that you are
talking about a "broken" repository).
In the spirit similar to afe5d3d5 ("symbolic ref: refuse non-ref
targets in HEAD", 2009-01-29), forbid removal of HEAD to avoid
corrupting a repository.
Signed-off-by: Junio C Hamano <gitster@pobox.com>
78 lines
2 KiB
C
78 lines
2 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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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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unsigned char sha1[20];
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int flag;
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const char *refname = resolve_ref_unsafe(HEAD, 0, sha1, &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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if (shorten)
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refname = shorten_unambiguous_ref(refname, 0);
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puts(refname);
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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(argv[0], NULL, REF_NODEREF);
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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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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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