git-filter-branch: more detailed USAGE

diff --git a/builtin-update-ref.c b/builtin-update-ref.c
index 5ee960bf41c4518b6c5530acb123a7ed668538fc..8339cf19e2b68a19e88c1a014c52672bc6f0c7b5 100644 (file)
--- a/builtin-update-ref.c
+++ b/builtin-update-ref.c
@@ -3,16 +3,17 @@
 #include "builtin.h"
 
 static const char git_update_ref_usage[] =
-"git-update-ref [-m <reason>] (-d <refname> <value> | <refname> <value> [<oldval>])";
+"git-update-ref [-m <reason>] (-d <refname> <value> | [--no-deref] <refname> <value> [<oldval>])";
 
 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;
        unsigned char sha1[20], oldsha1[20];
-       int i, delete;
+       int i, delete, ref_flags;
 
        delete = 0;
+       ref_flags = 0;
        git_config(git_default_config);
 
        for (i = 1; i < argc; i++) {
@@ -22,14 +23,16 @@ int cmd_update_ref(int argc, const char **argv, const char *prefix)
                        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 (!strcmp("-d", argv[i])) {
                        delete = 1;
                        continue;
                }
+               if (!strcmp("--no-deref", argv[i])) {
+                       ref_flags |= REF_NODEREF;
+                       continue;
+               }
                if (!refname) {
                        refname = argv[i];
                        continue;
@@ -59,7 +62,7 @@ int cmd_update_ref(int argc, const char **argv, const char *prefix)
        if (oldval && *oldval && get_sha1(oldval, oldsha1))
                die("%s: not a valid old SHA1", oldval);
 
-       lock = lock_any_ref_for_update(refname, oldval ? oldsha1 : NULL);
+       lock = lock_any_ref_for_update(refname, oldval ? oldsha1 : NULL, ref_flags);
        if (!lock)
                die("%s: cannot lock the ref", refname);
        if (write_ref_sha1(lock, sha1, msg) < 0)