$ git clone -n https://src.fedoraproject.org/rpms/rubygem-railties.git /var/lib/mock/f38-build-side-42-init-devel-735372-27633/root/chroot_tmpdir/scmroot/rubygem-railties
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-735372-27633/root/chroot_tmpdir/scmroot/rubygem-railties'...
$ git fetch origin fba261867189ab851c336221a833da94372b74cd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-railties
 * [new ref]         fba261867189ab851c336221a833da94372b74cd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fba2618 Enable tests.