$ git clone -n https://src.fedoraproject.org/rpms/g3kb-switch.git /var/lib/mock/f38-build-side-42-init-devel-743274-27657/root/chroot_tmpdir/scmroot/g3kb-switch
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-743274-27657/root/chroot_tmpdir/scmroot/g3kb-switch'...
$ git fetch origin d5ae0c4f38cb3689a3f608b945c0d3c7089e1065:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/g3kb-switch
 * [new ref]         d5ae0c4f38cb3689a3f608b945c0d3c7089e1065 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d5ae0c4 Initial import (rhbz#2187934).