1 files changed, 38 insertions, 0 deletions
diff --git a/third_party/git/builtin/unpack-file.c b/third_party/git/builtin/unpack-file.c
new file mode 100644
index 000000000000..58652229f273
--- /dev/null
+++ b/third_party/git/builtin/unpack-file.c
@@ -0,0 +1,38 @@
+#include "builtin.h"
+#include "config.h"
+#include "object-store.h"
+
+static char *create_temp_file(struct object_id *oid)
+{
+	static char path[50];
+	void *buf;
+	enum object_type type;
+	unsigned long size;
+	int fd;
+
+	buf = read_object_file(oid, &type, &size);
+	if (!buf || type != OBJ_BLOB)
+		die("unable to read blob object %s", oid_to_hex(oid));
+
+	xsnprintf(path, sizeof(path), ".merge_file_XXXXXX");
+	fd = xmkstemp(path);
+	if (write_in_full(fd, buf, size) < 0)
+		die_errno("unable to write temp-file");
+	close(fd);
+	return path;
+}
+
+int cmd_unpack_file(int argc, const char **argv, const char *prefix)
+{
+	struct object_id oid;
+
+	if (argc != 2 || !strcmp(argv[1], "-h"))
+		usage("git unpack-file <sha1>");
+	if (get_oid(argv[1], &oid))
+		die("Not a valid object name %s", argv[1]);
+
+	git_config(git_default_config, NULL);
+
+	puts(create_temp_file(&oid));
+	return 0;
+}