$ git clone -n https://src.fedoraproject.org/rpms/ps_mem.git /var/lib/mock/f45-build-28975-634/root/chroot_tmpdir/scmroot/ps_mem
Cloning into '/var/lib/mock/f45-build-28975-634/root/chroot_tmpdir/scmroot/ps_mem'...
$ git fetch origin 78b60dc56d628cdbc97cd2e6c1f1c8a12757dcf4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ps_mem
 * [new ref]         78b60dc56d628cdbc97cd2e6c1f1c8a12757dcf4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 78b60dc Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild