$ git clone -n https://src.fedoraproject.org/rpms/pss.git /var/lib/mock/f45-build-29003-634/root/chroot_tmpdir/scmroot/pss
Cloning into '/var/lib/mock/f45-build-29003-634/root/chroot_tmpdir/scmroot/pss'...
$ git fetch origin a4b908ae05cc70c78ffdadc2f56978e002eb1492:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/pss
 * [new ref]         a4b908ae05cc70c78ffdadc2f56978e002eb1492 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a4b908a Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild