$ git clone -n https://src.fedoraproject.org/rpms/pcs.git /var/lib/mock/f45-build-21488-586/root/chroot_tmpdir/scmroot/pcs
Cloning into '/var/lib/mock/f45-build-21488-586/root/chroot_tmpdir/scmroot/pcs'...
$ git fetch origin f589a506f671f4dc925bc8e54185256a267dfc63:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/pcs
 * [new ref]         f589a506f671f4dc925bc8e54185256a267dfc63 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f589a50 pcs-0.12.3-2