git svn: catch lack of upstream info for dcommit earlier
[git] / builtin-symbolic-ref.c
1 #include "builtin.h"
2 #include "cache.h"
3 #include "refs.h"
4 #include "parse-options.h"
5
6 static const char * const git_symbolic_ref_usage[] = {
7         "git symbolic-ref [options] name [ref]",
8         NULL
9 };
10
11 static void check_symref(const char *HEAD, int quiet)
12 {
13         unsigned char sha1[20];
14         int flag;
15         const char *refs_heads_master = resolve_ref(HEAD, sha1, 0, &flag);
16
17         if (!refs_heads_master)
18                 die("No such ref: %s", HEAD);
19         else if (!(flag & REF_ISSYMREF)) {
20                 if (!quiet)
21                         die("ref %s is not a symbolic ref", HEAD);
22                 else
23                         exit(1);
24         }
25         puts(refs_heads_master);
26 }
27
28 int cmd_symbolic_ref(int argc, const char **argv, const char *prefix)
29 {
30         int quiet = 0;
31         const char *msg = NULL;
32         struct option options[] = {
33                 OPT__QUIET(&quiet),
34                 OPT_STRING('m', NULL, &msg, "reason", "reason of the update"),
35                 OPT_END(),
36         };
37
38         git_config(git_default_config, NULL);
39         argc = parse_options(argc, argv, options, git_symbolic_ref_usage, 0);
40         if (msg &&!*msg)
41                 die("Refusing to perform update with empty message");
42         switch (argc) {
43         case 1:
44                 check_symref(argv[0], quiet);
45                 break;
46         case 2:
47                 create_symref(argv[0], argv[1], msg);
48                 break;
49         default:
50                 usage_with_options(git_symbolic_ref_usage, options);
51         }
52         return 0;
53 }