archive: add write_archive()

Both archive and upload-archive have to parse command line arguments and
then call the archiver specific write function.  Move the duplicate code
to a new function, write_archive().

Signed-off-by: Rene Scharfe <rene.scharfe@lsrfire.ath.cx>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 18 insertions, 0 deletions

diff --git a/archive.c b/archive.c
index b8b45bad77..75eb257760 100644
--- a/archive.c
+++ b/archive.c
@@ -155,3 +155,21 @@ int write_archive_entries(struct archiver_args *args,
 		err = 0;
 	return err;
 }
+
+int write_archive(int argc, const char **argv, const char *prefix,
+		int setup_prefix)
+{
+	const struct archiver *ar = NULL;
+	struct archiver_args args;
+	int tree_idx;
+
+	tree_idx = parse_archive_args(argc, argv, &ar, &args);
+	if (setup_prefix && prefix == NULL)
+		prefix = setup_git_directory();
+
+	argv += tree_idx;
+	parse_treeish_arg(argv, &args, prefix);
+	parse_pathspec_arg(argv + 1, &args);
+
+	return ar->write_archive(&args);
+}