submodule: Use cat instead of echo to avoid DOS line-endings
[git/dscho.git] / builtin / symbolic-ref.c
blobdea849c3c5ec0c0a7ee0ac98e1ae62a6dacf5806
1 #include "builtin.h"
2 #include "cache.h"
3 #include "refs.h"
4 #include "parse-options.h"
6 static const char * const git_symbolic_ref_usage[] = {
7 "git symbolic-ref [options] name [ref]",
8 NULL
9 };
11 static void check_symref(const char *HEAD, int quiet)
13 unsigned char sha1[20];
14 int flag;
15 const char *refs_heads_master = resolve_ref(HEAD, sha1, 0, &flag);
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);
25 puts(refs_heads_master);
28 int cmd_symbolic_ref(int argc, const char **argv, const char *prefix)
30 int quiet = 0;
31 const char *msg = NULL;
32 struct option options[] = {
33 OPT__QUIET(&quiet,
34 "suppress error message for non-symbolic (detached) refs"),
35 OPT_STRING('m', NULL, &msg, "reason", "reason of the update"),
36 OPT_END(),
39 git_config(git_default_config, NULL);
40 argc = parse_options(argc, argv, prefix, options,
41 git_symbolic_ref_usage, 0);
42 if (msg &&!*msg)
43 die("Refusing to perform update with empty message");
44 switch (argc) {
45 case 1:
46 check_symref(argv[0], quiet);
47 break;
48 case 2:
49 if (!strcmp(argv[0], "HEAD") &&
50 prefixcmp(argv[1], "refs/"))
51 die("Refusing to point HEAD outside of refs/");
52 create_symref(argv[0], argv[1], msg);
53 break;
54 default:
55 usage_with_options(git_symbolic_ref_usage, options);
57 return 0;