git.el: Fix typo in git-update-saved-file error handling.
[git] / builtin-update-ref.c
1 #include "cache.h"
2 #include "refs.h"
3 #include "builtin.h"
4
5 static const char git_update_ref_usage[] =
6 "git-update-ref [-m <reason>] (-d <refname> <value> | [--no-deref] <refname> <value> [<oldval>])";
7
8 int cmd_update_ref(int argc, const char **argv, const char *prefix)
9 {
10         const char *refname=NULL, *value=NULL, *oldval=NULL, *msg=NULL;
11         unsigned char sha1[20], oldsha1[20];
12         int i, delete, ref_flags;
13
14         delete = 0;
15         ref_flags = 0;
16         git_config(git_default_config);
17
18         for (i = 1; i < argc; i++) {
19                 if (!strcmp("-m", argv[i])) {
20                         if (i+1 >= argc)
21                                 usage(git_update_ref_usage);
22                         msg = argv[++i];
23                         if (!*msg)
24                                 die("Refusing to perform update with empty message.");
25                         continue;
26                 }
27                 if (!strcmp("-d", argv[i])) {
28                         delete = 1;
29                         continue;
30                 }
31                 if (!strcmp("--no-deref", argv[i])) {
32                         ref_flags |= REF_NODEREF;
33                         continue;
34                 }
35                 if (!refname) {
36                         refname = argv[i];
37                         continue;
38                 }
39                 if (!value) {
40                         value = argv[i];
41                         continue;
42                 }
43                 if (!oldval) {
44                         oldval = argv[i];
45                         continue;
46                 }
47         }
48         if (!refname || !value)
49                 usage(git_update_ref_usage);
50
51         if (get_sha1(value, sha1))
52                 die("%s: not a valid SHA1", value);
53
54         if (delete) {
55                 if (oldval)
56                         usage(git_update_ref_usage);
57                 return delete_ref(refname, sha1);
58         }
59
60         hashclr(oldsha1);
61         if (oldval && *oldval && get_sha1(oldval, oldsha1))
62                 die("%s: not a valid old SHA1", oldval);
63
64         return update_ref(msg, refname, sha1, oldval ? oldsha1 : NULL,
65                           ref_flags, DIE_ON_ERR);
66 }