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