$ git clone -n https://src.fedoraproject.org/rpms/pengupop.git /var/lib/mock/f45-build-21524-586/root/chroot_tmpdir/scmroot/pengupop
Cloning into '/var/lib/mock/f45-build-21524-586/root/chroot_tmpdir/scmroot/pengupop'...
$ git fetch origin 5b62ca519f94fc945513a435ab8aed9d301199cd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/pengupop
 * [new ref]         5b62ca519f94fc945513a435ab8aed9d301199cd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5b62ca5 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild