Merge branch 'lt/follow'
[git/spearce.git] / builtin-symbolic-ref.c
blobd41b40640b96e7d5568174c7d16088c29d361d42
1 #include "builtin.h"
2 #include "cache.h"
3 #include "refs.h"
5 static const char git_symbolic_ref_usage[] =
6 "git-symbolic-ref [-q] [-m <reason>] name [ref]";
8 static void check_symref(const char *HEAD, int quiet)
10 unsigned char sha1[20];
11 int flag;
12 const char *refs_heads_master = resolve_ref(HEAD, sha1, 0, &flag);
14 if (!refs_heads_master)
15 die("No such ref: %s", HEAD);
16 else if (!(flag & REF_ISSYMREF)) {
17 if (!quiet)
18 die("ref %s is not a symbolic ref", HEAD);
19 else
20 exit(1);
22 puts(refs_heads_master);
25 int cmd_symbolic_ref(int argc, const char **argv, const char *prefix)
27 int quiet = 0;
28 const char *msg = NULL;
30 git_config(git_default_config);
32 while (1 < argc) {
33 const char *arg = argv[1];
34 if (arg[0] != '-')
35 break;
36 else if (!strcmp("-q", arg))
37 quiet = 1;
38 else if (!strcmp("-m", arg)) {
39 argc--;
40 argv++;
41 if (argc <= 1)
42 break;
43 msg = argv[1];
44 if (!*msg)
45 die("Refusing to perform update with empty message");
46 if (strchr(msg, '\n'))
47 die("Refusing to perform update with \\n in message");
49 else if (!strcmp("--", arg)) {
50 argc--;
51 argv++;
52 break;
54 else
55 die("unknown option %s", arg);
56 argc--;
57 argv++;
60 switch (argc) {
61 case 2:
62 check_symref(argv[1], quiet);
63 break;
64 case 3:
65 create_symref(argv[1], argv[2], msg);
66 break;
67 default:
68 usage(git_symbolic_ref_usage);
70 return 0;