$ git clone -n https://src.fedoraproject.org/rpms/perl-Devel-Cycle.git /var/lib/mock/f45-build-23071-595/root/chroot_tmpdir/scmroot/perl-Devel-Cycle
Cloning into '/var/lib/mock/f45-build-23071-595/root/chroot_tmpdir/scmroot/perl-Devel-Cycle'...
$ git fetch origin b6a7ed20ec464b64cbb9a8d0d981f9eedc6a58cd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Devel-Cycle
 * [new ref]         b6a7ed20ec464b64cbb9a8d0d981f9eedc6a58cd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b6a7ed2 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild