$ git clone -n https://src.fedoraproject.org/rpms/pcb.git /var/lib/mock/f45-build-21458-584/root/chroot_tmpdir/scmroot/pcb
Cloning into '/var/lib/mock/f45-build-21458-584/root/chroot_tmpdir/scmroot/pcb'...
$ git fetch origin 1b0ec47050a4188ad131d1b570fdf1d11a1f8c17:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/pcb
 * [new ref]         1b0ec47050a4188ad131d1b570fdf1d11a1f8c17 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1b0ec47 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild