diff --git a/builtin-checkout.c b/builtin-checkout.c
index c4fc2b2c562725018789dead3b86ccfbc4e2925f..1deda927cdfcbcdcb751aca3338ac77ef0aad836 100644 (file)
--- a/builtin-checkout.c
+++ b/builtin-checkout.c
return checkout_paths(source_tree, pathspec);
}
+ if (opts.new_branch) {
+ struct strbuf buf;
+ strbuf_init(&buf, 0);
+ strbuf_addstr(&buf, "refs/heads/");
+ strbuf_addstr(&buf, opts.new_branch);
+ if (!get_sha1(buf.buf, rev))
+ die("git checkout: branch %s already exists", opts.new_branch);
+ if (check_ref_format(buf.buf))
+ die("git checkout: we do not like '%s' as a branch name.", opts.new_branch);
+ strbuf_release(&buf);
+ }
+
if (new.name && !new.commit) {
die("Cannot switch branch to a non-commit.");
}