git-pull: allow pulling into an empty repository
[git] / builtin-symbolic-ref.c
1 #include "builtin.h"
2 #include "cache.h"
3 #include "refs.h"
4
5 static const char git_symbolic_ref_usage[] =
6 "git-symbolic-ref name [ref]";
7
8 static void check_symref(const char *HEAD)
9 {
10         unsigned char sha1[20];
11         int flag;
12         const char *refs_heads_master = resolve_ref(HEAD, sha1, 0, &flag);
13
14         if (!refs_heads_master)
15                 die("No such ref: %s", HEAD);
16         else if (!(flag & REF_ISSYMREF))
17                 die("ref %s is not a symbolic ref", HEAD);
18         puts(refs_heads_master);
19 }
20
21 int cmd_symbolic_ref(int argc, const char **argv, const char *prefix)
22 {
23         git_config(git_default_config);
24         switch (argc) {
25         case 2:
26                 check_symref(argv[1]);
27                 break;
28         case 3:
29                 create_symref(argv[1], argv[2]);
30                 break;
31         default:
32                 usage(git_symbolic_ref_usage);
33         }
34         return 0;
35 }