builtin/symbolic-ref.c

   1 #include "builtin.h"
   2 #include "config.h"
   3 #include "cache.h"
   4 #include "refs.h"
   5 #include "parse-options.h"
   6
   7 static const char * const git_symbolic_ref_usage[] = {
   8         N_("git symbolic-ref [<options>] <name> [<ref>]"),
   9         N_("git symbolic-ref -d [-q] <name>"),
  10         NULL
  11 };
  12
  13 static int check_symref(const char *HEAD, int quiet, int shorten, int print)
  14 {
  15         int flag;
  16         const char *refname = resolve_ref_unsafe(HEAD, 0, NULL, &flag);
  17
  18         if (!refname)
  19                 die("No such ref: %s", HEAD);
  20         else if (!(flag & REF_ISSYMREF)) {
  21                 if (!quiet)
  22                         die("ref %s is not a symbolic ref", HEAD);
  23                 else
  24                         return 1;
  25         }
  26         if (print) {
  27                 char *to_free = NULL;
  28                 if (shorten)
  29                         refname = to_free = shorten_unambiguous_ref(refname, 0);
  30                 puts(refname);
  31                 free(to_free);
  32         }
  33         return 0;
  34 }
  35
  36 int cmd_symbolic_ref(int argc, const char **argv, const char *prefix)
  37 {
  38         int quiet = 0, delete = 0, shorten = 0, ret = 0;
  39         const char *msg = NULL;
  40         struct option options[] = {
  41                 OPT__QUIET(&quiet,
  42                         N_("suppress error message for non-symbolic (detached) refs")),
  43                 OPT_BOOL('d', "delete", &delete, N_("delete symbolic ref")),
  44                 OPT_BOOL(0, "short", &shorten, N_("shorten ref output")),
  45                 OPT_STRING('m', NULL, &msg, N_("reason"), N_("reason of the update")),
  46                 OPT_END(),
  47         };
  48
  49         git_config(git_default_config, NULL);
  50         argc = parse_options(argc, argv, prefix, options,
  51                              git_symbolic_ref_usage, 0);
  52         if (msg && !*msg)
  53                 die("Refusing to perform update with empty message");
  54
  55         if (delete) {
  56                 if (argc != 1)
  57                         usage_with_options(git_symbolic_ref_usage, options);
  58                 ret = check_symref(argv[0], 1, 0, 0);
  59                 if (ret)
  60                         die("Cannot delete %s, not a symbolic ref", argv[0]);
  61                 if (!strcmp(argv[0], "HEAD"))
  62                         die("deleting '%s' is not allowed", argv[0]);
  63                 return delete_ref(NULL, argv[0], NULL, REF_NO_DEREF);
  64         }
  65
  66         switch (argc) {
  67         case 1:
  68                 ret = check_symref(argv[0], quiet, shorten, 1);
  69                 break;
  70         case 2:
  71                 if (!strcmp(argv[0], "HEAD") &&
  72                     !starts_with(argv[1], "refs/"))
  73                         die("Refusing to point HEAD outside of refs/");
  74                 ret = !!create_symref(argv[0], argv[1], msg);
  75                 break;
  76         default:
  77                 usage_with_options(git_symbolic_ref_usage, options);
  78         }
  79         return ret;
  80 }