$ git clone -n https://src.fedoraproject.org/rpms/kscreenlocker.git /var/lib/mock/f39-build-1763890-41501/root/chroot_tmpdir/scmroot/kscreenlocker
Cloning into '/var/lib/mock/f39-build-1763890-41501/root/chroot_tmpdir/scmroot/kscreenlocker'...
$ git fetch origin f1cd8196848f30bd73f6ed0bec30f5f828ebf7d6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kscreenlocker
 * [new ref]         f1cd8196848f30bd73f6ed0bec30f5f828ebf7d6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f1cd819 5.27.9