$ git clone -n https://src.fedoraproject.org/rpms/perl-Devel-Hide.git /var/lib/mock/f45-build-23129-596/root/chroot_tmpdir/scmroot/perl-Devel-Hide
Cloning into '/var/lib/mock/f45-build-23129-596/root/chroot_tmpdir/scmroot/perl-Devel-Hide'...
$ git fetch origin d7909ce419ba1216a2e2714064c695630775331a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Devel-Hide
 * [new ref]         d7909ce419ba1216a2e2714064c695630775331a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d7909ce Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild