$ git clone -n https://src.fedoraproject.org/rpms/kscreenlocker.git /var/lib/mock/f42-build-side-1-3522636-46186/root/chroot_tmpdir/scmroot/kscreenlocker
Cloning into '/var/lib/mock/f42-build-side-1-3522636-46186/root/chroot_tmpdir/scmroot/kscreenlocker'...
$ git fetch origin 8737b6a20e0cea45191f4af23c911c904fd5c213:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kscreenlocker
 * [new ref]         8737b6a20e0cea45191f4af23c911c904fd5c213 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8737b6a Rebuild (qt6)