git-apply: handle a patch that touches the same path more than once better
[git] / builtin-update-ref.c
1 #include "cache.h"
2 #include "refs.h"
3 #include "builtin.h"
4 #include "parse-options.h"
5
6 static const char * const git_update_ref_usage[] = {
7         "git-update-ref [options] -d <refname> [<oldval>]",
8         "git-update-ref [options]    <refname> <newval> [<oldval>]",
9         NULL
10 };
11
12 int cmd_update_ref(int argc, const char **argv, const char *prefix)
13 {
14         const char *refname, *oldval, *msg=NULL;
15         unsigned char sha1[20], oldsha1[20];
16         int delete = 0, no_deref = 0;
17         struct option options[] = {
18                 OPT_STRING( 'm', NULL, &msg, "reason", "reason of the update"),
19                 OPT_BOOLEAN('d', NULL, &delete, "deletes the reference"),
20                 OPT_BOOLEAN( 0 , "no-deref", &no_deref,
21                                         "update <refname> not the one it points to"),
22                 OPT_END(),
23         };
24
25         git_config(git_default_config, NULL);
26         argc = parse_options(argc, argv, options, git_update_ref_usage, 0);
27         if (msg && !*msg)
28                 die("Refusing to perform update with empty message.");
29
30         if (delete) {
31                 if (argc < 1 || argc > 2)
32                         usage_with_options(git_update_ref_usage, options);
33                 refname = argv[0];
34                 oldval = argv[1];
35         } else {
36                 const char *value;
37                 if (argc < 2 || argc > 3)
38                         usage_with_options(git_update_ref_usage, options);
39                 refname = argv[0];
40                 value = argv[1];
41                 oldval = argv[2];
42                 if (get_sha1(value, sha1))
43                         die("%s: not a valid SHA1", value);
44         }
45
46         hashclr(oldsha1); /* all-zero hash in case oldval is the empty string */
47         if (oldval && *oldval && get_sha1(oldval, oldsha1))
48                 die("%s: not a valid old SHA1", oldval);
49
50         if (delete)
51                 return delete_ref(refname, oldval ? oldsha1 : NULL);
52         else
53                 return update_ref(msg, refname, sha1, oldval ? oldsha1 : NULL,
54                                   no_deref ? REF_NODEREF : 0, DIE_ON_ERR);
55 }