$ git clone -n https://src.fedoraproject.org/rpms/rubygem-em-websocket.git /var/lib/mock/f38-build-side-42-init-devel-647793-26439/root/chroot_tmpdir/scmroot/rubygem-em-websocket
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-647793-26439/root/chroot_tmpdir/scmroot/rubygem-em-websocket'...
$ git fetch origin b76a6c238322700876f0d0ec43e0293bc2eb0293:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-em-websocket
 * [new ref]         b76a6c238322700876f0d0ec43e0293bc2eb0293 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b76a6c2 Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild