$ git clone -n https://src.fedoraproject.org/rpms/kscreenlocker.git /var/lib/mock/f38-build-side-42-init-devel-642940-26394/root/chroot_tmpdir/scmroot/kscreenlocker
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-642940-26394/root/chroot_tmpdir/scmroot/kscreenlocker'...
$ git fetch origin f97d331408545d072f7ebc49e6be931d5bdd3055:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kscreenlocker
 * [new ref]         f97d331408545d072f7ebc49e6be931d5bdd3055 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f97d331 5.27.4