Andrew's git - gitweb.git/blob - builtin-update-ref.c

   1#include "cache.h"
   2#include "refs.h"
   3#include "builtin.h"
   4
   5static const char git_update_ref_usage[] =
   6"git-update-ref [-m <reason>] (-d <refname> <value> | <refname> <value> [<oldval>])";
   7
   8int cmd_update_ref(int argc, const char **argv, const char *prefix)
   9{
  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, delete;
  14
  15        delete = 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                        if (strchr(msg, '\n'))
  26                                die("Refusing to perform update with \\n in message.");
  27                        continue;
  28                }
  29                if (!strcmp("-d", argv[i])) {
  30                        delete = 1;
  31                        continue;
  32                }
  33                if (!refname) {
  34                        refname = argv[i];
  35                        continue;
  36                }
  37                if (!value) {
  38                        value = argv[i];
  39                        continue;
  40                }
  41                if (!oldval) {
  42                        oldval = argv[i];
  43                        continue;
  44                }
  45        }
  46        if (!refname || !value)
  47                usage(git_update_ref_usage);
  48
  49        if (get_sha1(value, sha1))
  50                die("%s: not a valid SHA1", value);
  51
  52        if (delete) {
  53                if (oldval)
  54                        usage(git_update_ref_usage);
  55                return delete_ref(refname, sha1);
  56        }
  57
  58        hashclr(oldsha1);
  59        if (oldval && *oldval && get_sha1(oldval, oldsha1))
  60                die("%s: not a valid old SHA1", oldval);
  61
  62        lock = lock_any_ref_for_update(refname, oldval ? oldsha1 : NULL);
  63        if (!lock)
  64                die("%s: cannot lock the ref", refname);
  65        if (write_ref_sha1(lock, sha1, msg) < 0)
  66                die("%s: cannot update the ref", refname);
  67        return 0;
  68}