1 files changed, 52 insertions, 0 deletions
diff --git a/builtin-write-tree.c b/builtin-write-tree.c
new file mode 100644
index 0000000000..e838d01233
--- /dev/null
+++ b/builtin-write-tree.c
@@ -0,0 +1,52 @@
+/*
+ * GIT - The information manager from hell
+ *
+ * Copyright (C) Linus Torvalds, 2005
+ */
+#include "builtin.h"
+#include "cache.h"
+#include "tree.h"
+#include "cache-tree.h"
+
+static const char write_tree_usage[] =
+"git-write-tree [--missing-ok] [--prefix=<prefix>/]";
+
+int cmd_write_tree(int argc, const char **argv, const char *unused_prefix)
+{
+	int missing_ok = 0, ret;
+	const char *prefix = NULL;
+	unsigned char sha1[20];
+	const char *me = "git-write-tree";
+
+	git_config(git_default_config);
+	while (1 < argc) {
+		const char *arg = argv[1];
+		if (!strcmp(arg, "--missing-ok"))
+			missing_ok = 1;
+		else if (!prefixcmp(arg, "--prefix="))
+			prefix = arg + 9;
+		else
+			usage(write_tree_usage);
+		argc--; argv++;
+	}
+
+	if (argc > 2)
+		die("too many options");
+
+	ret = write_cache_as_tree(sha1, missing_ok, prefix);
+	switch (ret) {
+	case 0:
+		printf("%s\n", sha1_to_hex(sha1));
+		break;
+	case WRITE_TREE_UNREADABLE_INDEX:
+		die("%s: error reading the index", me);
+		break;
+	case WRITE_TREE_UNMERGED_INDEX:
+		die("%s: error building trees; the index is unmerged?", me);
+		break;
+	case WRITE_TREE_PREFIX_ERROR:
+		die("%s: prefix %s not found", me, prefix);
+		break;
+	}
+	return ret;
+}