Merge branch 'rs/daemon-sanitize-dir-sep'
[git] / builtin / symbolic-ref.c
1 #include "builtin.h"
2 #include "config.h"
3 #include "cache.h"
4 #include "refs.h"
5 #include "parse-options.h"
6
7 static const char * const git_symbolic_ref_usage[] = {
8         N_("git symbolic-ref [<options>] <name> [<ref>]"),
9         N_("git symbolic-ref -d [-q] <name>"),
10         NULL
11 };
12
13 static int check_symref(const char *HEAD, int quiet, int shorten, int print)
14 {
15         int flag;
16         const char *refname = resolve_ref_unsafe(HEAD, 0, NULL, &flag);
17
18         if (!refname)
19                 die("No such ref: %s", HEAD);
20         else if (!(flag & REF_ISSYMREF)) {
21                 if (!quiet)
22                         die("ref %s is not a symbolic ref", HEAD);
23                 else
24                         return 1;
25         }
26         if (print) {
27                 char *to_free = NULL;
28                 if (shorten)
29                         refname = to_free = shorten_unambiguous_ref(refname, 0);
30                 puts(refname);
31                 free(to_free);
32         }
33         return 0;
34 }
35
36 int cmd_symbolic_ref(int argc, const char **argv, const char *prefix)
37 {
38         int quiet = 0, delete = 0, shorten = 0, ret = 0;
39         const char *msg = NULL;
40         struct option options[] = {
41                 OPT__QUIET(&quiet,
42                         N_("suppress error message for non-symbolic (detached) refs")),
43                 OPT_BOOL('d', "delete", &delete, N_("delete symbolic ref")),
44                 OPT_BOOL(0, "short", &shorten, N_("shorten ref output")),
45                 OPT_STRING('m', NULL, &msg, N_("reason"), N_("reason of the update")),
46                 OPT_END(),
47         };
48
49         git_config(git_default_config, NULL);
50         argc = parse_options(argc, argv, prefix, options,
51                              git_symbolic_ref_usage, 0);
52         if (msg && !*msg)
53                 die("Refusing to perform update with empty message");
54
55         if (delete) {
56                 if (argc != 1)
57                         usage_with_options(git_symbolic_ref_usage, options);
58                 ret = check_symref(argv[0], 1, 0, 0);
59                 if (ret)
60                         die("Cannot delete %s, not a symbolic ref", argv[0]);
61                 if (!strcmp(argv[0], "HEAD"))
62                         die("deleting '%s' is not allowed", argv[0]);
63                 return delete_ref(NULL, argv[0], NULL, REF_NO_DEREF);
64         }
65
66         switch (argc) {
67         case 1:
68                 ret = check_symref(argv[0], quiet, shorten, 1);
69                 break;
70         case 2:
71                 if (!strcmp(argv[0], "HEAD") &&
72                     !starts_with(argv[1], "refs/"))
73                         die("Refusing to point HEAD outside of refs/");
74                 ret = !!create_symref(argv[0], argv[1], msg);
75                 break;
76         default:
77                 usage_with_options(git_symbolic_ref_usage, options);
78         }
79         return ret;
80 }