Convert memset(hash,0,20) to hashclr(hash).
[git/git.git] / builtin-update-ref.c
CommitLineData
66bf85a4
LT
1#include "cache.h"
2#include "refs.h"
854b4629 3#include "builtin.h"
66bf85a4 4
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SP
5static const char git_update_ref_usage[] =
6"git-update-ref <refname> <value> [<oldval>] [-m <reason>]";
152da3df 7
a633fca0 8int cmd_update_ref(int argc, const char **argv, const char *prefix)
66bf85a4 9{
5b16b090
SP
10 const char *refname=NULL, *value=NULL, *oldval=NULL, *msg=NULL;
11 struct ref_lock *lock;
12 unsigned char sha1[20], oldsha1[20];
13 int i;
66bf85a4 14
0b0fe4a6 15 setup_ident();
84a9b58c 16 git_config(git_default_config);
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SP
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 if (strchr(msg, '\n'))
26 die("Refusing to perform update with \\n in message.");
27 continue;
28 }
29 if (!refname) {
30 refname = argv[i];
31 continue;
32 }
33 if (!value) {
34 value = argv[i];
35 continue;
36 }
37 if (!oldval) {
38 oldval = argv[i];
39 continue;
40 }
41 }
42 if (!refname || !value)
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LT
43 usage(git_update_ref_usage);
44
31fff305 45 if (get_sha1(value, sha1))
66bf85a4 46 die("%s: not a valid SHA1", value);
a8e0d16d 47 hashclr(oldsha1);
31fff305 48 if (oldval && get_sha1(oldval, oldsha1))
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49 die("%s: not a valid old SHA1", oldval);
50
5b16b090
SP
51 lock = lock_any_ref_for_update(refname, oldval ? oldsha1 : NULL, 0);
52 if (!lock)
53 return 1;
54 if (write_ref_sha1(lock, sha1, msg) < 0)
55 return 1;
854b4629
LS
56
57 /* write_ref_sha1 always unlocks the ref, no need to do it explicitly */
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LT
58 return 0;
59}