write-tree: check extra arguments and die but be a bit more helpful.

"git-write-tree junk" complains and dies, but it does not say
what option it supports.  Die with the usage string in such a
case.

Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/write-tree.c b/write-tree.c
index 0aac32f..f866059 100644 (file)
--- a/write-tree.c
+++ b/write-tree.c
@@ -83,6 +83,8 @@ static int write_tree(struct cache_entry **cachep, int maxentries, const char *b
        return nr;
 }
 
+static const char write_tree_usage[] = "git-write-tree [--missing-ok]";
+
 int main(int argc, char **argv)
 {
        int i, funny;
@@ -96,7 +98,7 @@ int main(int argc, char **argv)
                if (!strcmp(argv[1], "--missing-ok"))
                        missing_ok = 1;
                else
-                       die("unknown option %s", argv[1]);
+                       die(write_tree_usage);
        }
        
        if (argc > 2)