builtin/symbolic-ref.c

   1 #define USE_THE_REPOSITORY_VARIABLE
   2 #include "builtin.h"
   3 #include "config.h"
   4 #include "gettext.h"
   5 #include "refs.h"
   6 #include "parse-options.h"
   7 #include "strbuf.h"
   8
   9 static const char * const git_symbolic_ref_usage[] = {
  10         N_("git symbolic-ref [-m <reason>] <name> <ref>"),
  11         N_("git symbolic-ref [-q] [--short] [--no-recurse] <name>"),
  12         N_("git symbolic-ref --delete [-q] <name>"),
  13         NULL
  14 };
  15
  16 static int check_symref(const char *HEAD, int quiet, int shorten, int recurse, int print)
  17 {
  18         int resolve_flags, flag;
  19         const char *refname;
  20
  21         resolve_flags = (recurse ? 0 : RESOLVE_REF_NO_RECURSE);
  22         refname = refs_resolve_ref_unsafe(get_main_ref_store(the_repository),
  23                                           HEAD, resolve_flags, NULL, &flag);
  24
  25         if (!refname)
  26                 die("No such ref: %s", HEAD);
  27         else if (!(flag & REF_ISSYMREF)) {
  28                 if (!quiet)
  29                         die("ref %s is not a symbolic ref", HEAD);
  30                 else
  31                         return 1;
  32         }
  33         if (print) {
  34                 char *to_free = NULL;
  35                 if (shorten)
  36                         refname = to_free = refs_shorten_unambiguous_ref(get_main_ref_store(the_repository),
  37                                                                          refname,
  38                                                                          0);
  39                 puts(refname);
  40                 free(to_free);
  41         }
  42         return 0;
  43 }
  44
  45 int cmd_symbolic_ref(int argc,
  46                      const char **argv,
  47                      const char *prefix,
  48                      struct repository *repo UNUSED)
  49 {
  50         int quiet = 0, delete = 0, shorten = 0, recurse = 1, ret = 0;
  51         const char *msg = NULL;
  52         struct option options[] = {
  53                 OPT__QUIET(&quiet,
  54                         N_("suppress error message for non-symbolic (detached) refs")),
  55                 OPT_BOOL('d', "delete", &delete, N_("delete symbolic ref")),
  56                 OPT_BOOL(0, "short", &shorten, N_("shorten ref output")),
  57                 OPT_BOOL(0, "recurse", &recurse, N_("recursively dereference (default)")),
  58                 OPT_STRING('m', NULL, &msg, N_("reason"), N_("reason of the update")),
  59                 OPT_END(),
  60         };
  61
  62         git_config(git_default_config, NULL);
  63         argc = parse_options(argc, argv, prefix, options,
  64                              git_symbolic_ref_usage, 0);
  65         if (msg && !*msg)
  66                 die("Refusing to perform update with empty message");
  67
  68         if (delete) {
  69                 if (argc != 1)
  70                         usage_with_options(git_symbolic_ref_usage, options);
  71                 ret = check_symref(argv[0], 1, 0, 0, 0);
  72                 if (ret)
  73                         die("Cannot delete %s, not a symbolic ref", argv[0]);
  74                 if (!strcmp(argv[0], "HEAD"))
  75                         die("deleting '%s' is not allowed", argv[0]);
  76                 return refs_delete_ref(get_main_ref_store(the_repository),
  77                                        NULL, argv[0], NULL, REF_NO_DEREF);
  78         }
  79
  80         switch (argc) {
  81         case 1:
  82                 ret = check_symref(argv[0], quiet, shorten, recurse, 1);
  83                 break;
  84         case 2:
  85                 if (!strcmp(argv[0], "HEAD") &&
  86                     !starts_with(argv[1], "refs/"))
  87                         die("Refusing to point HEAD outside of refs/");
  88                 if (check_refname_format(argv[1], REFNAME_ALLOW_ONELEVEL) < 0)
  89                         die("Refusing to set '%s' to invalid ref '%s'", argv[0], argv[1]);
  90                 ret = !!refs_update_symref(get_main_ref_store(the_repository),
  91                                            argv[0], argv[1], msg);
  92                 break;
  93         default:
  94                 usage_with_options(git_symbolic_ref_usage, options);
  95         }
  96         return ret;
  97 }