add logref support to git-symbolic-ref
[git/git.git] / builtin-symbolic-ref.c
CommitLineData
640ce105 1#include "builtin.h"
8098a178 2#include "cache.h"
8da19775 3#include "refs.h"
8098a178
JH
4
5static const char git_symbolic_ref_usage[] =
8b5157e4 6"git-symbolic-ref [-q] [-m <reason>] name [ref]";
8098a178 7
a0f4280f 8static void check_symref(const char *HEAD, int quiet)
8098a178
JH
9{
10 unsigned char sha1[20];
8da19775
JH
11 int flag;
12 const char *refs_heads_master = resolve_ref(HEAD, sha1, 0, &flag);
ed378ec7
LT
13
14 if (!refs_heads_master)
8098a178 15 die("No such ref: %s", HEAD);
a0f4280f
JH
16 else if (!(flag & REF_ISSYMREF)) {
17 if (!quiet)
18 die("ref %s is not a symbolic ref", HEAD);
19 else
20 exit(1);
21 }
ed378ec7 22 puts(refs_heads_master);
8098a178
JH
23}
24
640ce105 25int cmd_symbolic_ref(int argc, const char **argv, const char *prefix)
8098a178 26{
a0f4280f 27 int quiet = 0;
8b5157e4 28 const char *msg = NULL;
a0f4280f 29
27dedf0c 30 git_config(git_default_config);
a0f4280f
JH
31
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;
8b5157e4
NP
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");
48 }
a0f4280f
JH
49 else if (!strcmp("--", arg)) {
50 argc--;
51 argv++;
52 break;
53 }
54 else
55 die("unknown option %s", arg);
56 argc--;
57 argv++;
58 }
59
8098a178
JH
60 switch (argc) {
61 case 2:
a0f4280f 62 check_symref(argv[1], quiet);
8098a178
JH
63 break;
64 case 3:
8b5157e4 65 create_symref(argv[1], argv[2], msg);
8098a178
JH
66 break;
67 default:
68 usage(git_symbolic_ref_usage);
69 }
70 return 0;
71}