post-checkout hook, tests, and docs

diff --git a/builtin-write-tree.c b/builtin-write-tree.c
index 391de53972ebf77d2e08f1b405969e065bd8b371..b89d02efec813d33f8540d2a6d433a94ce1e0a31 100644 (file)
--- a/builtin-write-tree.c
+++ b/builtin-write-tree.c
@@ -52,6 +52,8 @@ 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);
+               if (!subtree)
+                       die("git-write-tree: prefix %s not found", prefix);
                hashcpy(sha1, subtree->sha1);
        }
        else
@@ -70,6 +72,7 @@ int cmd_write_tree(int argc, const char **argv, const char *unused_prefix)
        const char *prefix = NULL;
        unsigned char sha1[20];
 
+       git_config(git_default_config);
        while (1 < argc) {
                const char *arg = argv[1];
                if (!strcmp(arg, "--missing-ok"))