Add support for negative refs
[git/git.git] / builtin-symbolic-ref.c
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640ce105 1#include "builtin.h"
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2#include "cache.h"
3
4static const char git_symbolic_ref_usage[] =
5"git-symbolic-ref name [ref]";
6
f5a5e9b9 7static void check_symref(const char *HEAD)
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8{
9 unsigned char sha1[20];
9befac47 10 const char *git_HEAD = xstrdup(git_path("%s", HEAD));
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11 const char *git_refs_heads_master = resolve_ref(git_HEAD, sha1, 0);
12 if (git_refs_heads_master) {
13 /* we want to strip the .git/ part */
14 int pfxlen = strlen(git_HEAD) - strlen(HEAD);
15 puts(git_refs_heads_master + pfxlen);
16 }
17 else
18 die("No such ref: %s", HEAD);
19}
20
640ce105 21int cmd_symbolic_ref(int argc, const char **argv, const char *prefix)
8098a178 22{
27dedf0c 23 git_config(git_default_config);
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24 switch (argc) {
25 case 2:
26 check_symref(argv[1]);
27 break;
28 case 3:
9befac47 29 create_symref(xstrdup(git_path("%s", argv[1])), argv[2]);
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30 break;
31 default:
32 usage(git_symbolic_ref_usage);
33 }
34 return 0;
35}