$ git clone -n https://src.fedoraproject.org/rpms/perl-Hash-Diff.git /var/lib/mock/f45-build-24164-602/root/chroot_tmpdir/scmroot/perl-Hash-Diff
Cloning into '/var/lib/mock/f45-build-24164-602/root/chroot_tmpdir/scmroot/perl-Hash-Diff'...
$ git fetch origin dd48433bc62ccf02a2e40fb60c241c93261160c2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Hash-Diff
 * [new ref]         dd48433bc62ccf02a2e40fb60c241c93261160c2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dd48433 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild