fast-import: add input format tests

diff --git a/builtin/checkout.c b/builtin/checkout.c
index 28cdc51b85e7d433dca085c0080f964d19a391b4..af1e7b579a83aef15e11c0c5dfa29447e485654c 100644 (file)
--- a/builtin/checkout.c
+++ b/builtin/checkout.c
@@ -1071,7 +1071,7 @@ int cmd_checkout(int argc, const char **argv, const char *prefix)
                if (strbuf_check_branch_ref(&buf, opts.new_branch))
                        die(_("git checkout: we do not like '%s' as a branch name."),
                            opts.new_branch);
-               if (!get_sha1(buf.buf, rev)) {
+               if (ref_exists(buf.buf)) {
                        opts.branch_exists = 1;
                        if (!opts.new_branch_force)
                                die(_("git checkout: branch %s already exists"),