expose a helper function peel_to_type().

diff --git a/builtin-update-ref.c b/builtin-update-ref.c
index 5bd71825fdc48392952faf170efe98c072c7e482..e90737c350402fec8937a9e343485e1c71411f55 100644 (file)
--- a/builtin-update-ref.c
+++ b/builtin-update-ref.c
@@ -1,59 +1,51 @@
 #include "cache.h"
 #include "refs.h"
 #include "builtin.h"
+#include "parse-options.h"
 
-static const char git_update_ref_usage[] =
-"git-update-ref <refname> <value> [<oldval>] [-m <reason>]";
+static const char * const git_update_ref_usage[] = {
+       "git-update-ref [options] -d <refname> <oldval>",
+       "git-update-ref [options]    <refname> <newval> [<oldval>]",
+       NULL
+};
 
 int cmd_update_ref(int argc, const char **argv, const char *prefix)
 {
-       const char *refname=NULL, *value=NULL, *oldval=NULL, *msg=NULL;
-       struct ref_lock *lock;
+       const char *refname, *value, *oldval, *msg=NULL;
        unsigned char sha1[20], oldsha1[20];
-       int i;
+       int delete = 0, no_deref = 0;
+       struct option options[] = {
+               OPT_STRING( 'm', NULL, &msg, "reason", "reason of the update"),
+               OPT_BOOLEAN('d', NULL, &delete, "deletes the reference"),
+               OPT_BOOLEAN( 0 , "no-deref", &no_deref,
+                                       "update <refname> not the one it points to"),
+               OPT_END(),
+       };
 
-       setup_ident();
        git_config(git_default_config);
+       argc = parse_options(argc, argv, options, git_update_ref_usage, 0);
+       if (msg && !*msg)
+               die("Refusing to perform update with empty message.");
 
-       for (i = 1; i < argc; i++) {
-               if (!strcmp("-m", argv[i])) {
-                       if (i+1 >= argc)
-                               usage(git_update_ref_usage);
-                       msg = argv[++i];
-                       if (!*msg)
-                               die("Refusing to perform update with empty message.");
-                       if (strchr(msg, '\n'))
-                               die("Refusing to perform update with \\n in message.");
-                       continue;
-               }
-               if (!refname) {
-                       refname = argv[i];
-                       continue;
-               }
-               if (!value) {
-                       value = argv[i];
-                       continue;
-               }
-               if (!oldval) {
-                       oldval = argv[i];
-                       continue;
-               }
-       }
-       if (!refname || !value)
-               usage(git_update_ref_usage);
+       if (argc < 2 || argc > 3)
+               usage_with_options(git_update_ref_usage, options);
+       refname = argv[0];
+       value   = argv[1];
+       oldval  = argv[2];
 
        if (get_sha1(value, sha1))
                die("%s: not a valid SHA1", value);
-       memset(oldsha1, 0, 20);
-       if (oldval && get_sha1(oldval, oldsha1))
-               die("%s: not a valid old SHA1", oldval);
 
-       lock = lock_any_ref_for_update(refname, oldval ? oldsha1 : NULL, 0);
-       if (!lock)
-               return 1;
-       if (write_ref_sha1(lock, sha1, msg) < 0)
-               return 1;
+       if (delete) {
+               if (oldval)
+                       usage_with_options(git_update_ref_usage, options);
+               return delete_ref(refname, sha1);
+       }
+
+       hashclr(oldsha1);
+       if (oldval && *oldval && get_sha1(oldval, oldsha1))
+               die("%s: not a valid old SHA1", oldval);
 
-       /* write_ref_sha1 always unlocks the ref, no need to do it explicitly */
-       return 0;
+       return update_ref(msg, refname, sha1, oldval ? oldsha1 : NULL,
+                         no_deref ? REF_NODEREF : 0, DIE_ON_ERR);
 }