builtin-symbolic-ref.c

   1 #include "builtin.h"
   2 #include "cache.h"
   3 #include "refs.h"
   4
   5 static const char git_symbolic_ref_usage[] =
   6 "git-symbolic-ref [-q] [-m <reason>] name [ref]";
   7
   8 static void check_symref(const char *HEAD, int quiet)
   9 {
  10         unsigned char sha1[20];
  11         int flag;
  12         const char *refs_heads_master = resolve_ref(HEAD, sha1, 0, &flag);
  13
  14         if (!refs_heads_master)
  15                 die("No such ref: %s", HEAD);
  16         else if (!(flag & REF_ISSYMREF)) {
  17                 if (!quiet)
  18                         die("ref %s is not a symbolic ref", HEAD);
  19                 else
  20                         exit(1);
  21         }
  22         puts(refs_heads_master);
  23 }
  24
  25 int cmd_symbolic_ref(int argc, const char **argv, const char *prefix)
  26 {
  27         int quiet = 0;
  28         const char *msg = NULL;
  29
  30         git_config(git_default_config);
  31
  32         while (1 < argc) {
  33                 const char *arg = argv[1];
  34                 if (arg[0] != '-')
  35                         break;
  36                 else if (!strcmp("-q", arg))
  37                         quiet = 1;
  38                 else if (!strcmp("-m", arg)) {
  39                         argc--;
  40                         argv++;
  41                         if (argc <= 1)
  42                                 break;
  43                         msg = argv[1];
  44                         if (!*msg)
  45                                 die("Refusing to perform update with empty message");
  46                         if (strchr(msg, '\n'))
  47                                 die("Refusing to perform update with \\n in message");
  48                 }
  49                 else if (!strcmp("--", arg)) {
  50                         argc--;
  51                         argv++;
  52                         break;
  53                 }
  54                 else
  55                         die("unknown option %s", arg);
  56                 argc--;
  57                 argv++;
  58         }
  59
  60         switch (argc) {
  61         case 2:
  62                 check_symref(argv[1], quiet);
  63                 break;
  64         case 3:
  65                 create_symref(argv[1], argv[2], msg);
  66                 break;
  67         default:
  68                 usage(git_symbolic_ref_usage);
  69         }
  70         return 0;
  71 }