$ git clone -n https://src.fedoraproject.org/rpms/pgn-extract.git /var/lib/mock/f45-build-27795-626/root/chroot_tmpdir/scmroot/pgn-extract
Cloning into '/var/lib/mock/f45-build-27795-626/root/chroot_tmpdir/scmroot/pgn-extract'...
$ git fetch origin b737693a1563c21454ccd231addbeab58b9c4435:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/pgn-extract
 * [new ref]         b737693a1563c21454ccd231addbeab58b9c4435 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b737693 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild