show-branch -g: default to HEAD

diff --git a/builtin-write-tree.c b/builtin-write-tree.c
index 0289f59936267194ccbb8276a525ad24198a5de9..50670dc7bf46c74e95b2e204d05afc077350a19f 100644 (file)
--- a/builtin-write-tree.c
+++ b/builtin-write-tree.c
@@ -18,7 +18,7 @@ int write_tree(unsigned char *sha1, int missing_ok, const char *prefix)
        /* We can't free this memory, it becomes part of a linked list parsed atexit() */
        struct lock_file *lock_file = xcalloc(1, sizeof(struct lock_file));
 
-       newfd = hold_lock_file_for_update(lock_file, get_index_file());
+       newfd = hold_lock_file_for_update(lock_file, get_index_file(), 0);
 
        entries = read_cache();
        if (entries < 0)
@@ -50,10 +50,10 @@ int write_tree(unsigned char *sha1, int missing_ok, const char *prefix)
        if (prefix) {
                struct cache_tree *subtree =
                        cache_tree_find(active_cache_tree, prefix);
-               memcpy(sha1, subtree->sha1, 20);
+               hashcpy(sha1, subtree->sha1);
        }
        else
-               memcpy(sha1, active_cache_tree->sha1, 20);
+               hashcpy(sha1, active_cache_tree->sha1);
 
        rollback_lock_file(lock_file);
 
@@ -73,7 +73,7 @@ int cmd_write_tree(int argc, const char **argv, const char *unused_prefix)
                else if (!strncmp(arg, "--prefix=", 9))
                        prefix = arg + 9;
                else
-                       die(write_tree_usage);
+                       usage(write_tree_usage);
                argc--; argv++;
        }