$ git clone -n https://src.fedoraproject.org/rpms/perl-Test-Run.git /var/lib/mock/f45-build-26826-619/root/chroot_tmpdir/scmroot/perl-Test-Run
Cloning into '/var/lib/mock/f45-build-26826-619/root/chroot_tmpdir/scmroot/perl-Test-Run'...
$ git fetch origin 671f459e42b2cf9d8931b1eec6c8bb706fbaef7e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Test-Run
 * [new ref]         671f459e42b2cf9d8931b1eec6c8bb706fbaef7e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 671f459 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild