$ git clone -n https://src.fedoraproject.org/rpms/pystring.git /var/lib/mock/f45-build-29171-636/root/chroot_tmpdir/scmroot/pystring
Cloning into '/var/lib/mock/f45-build-29171-636/root/chroot_tmpdir/scmroot/pystring'...
$ git fetch origin d9499b3a90d0fd227b1d3831c219661fcb77429e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/pystring
 * [new ref]         d9499b3a90d0fd227b1d3831c219661fcb77429e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d9499b3 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild