$ git clone -n https://src.fedoraproject.org/rpms/perl-Test-Modern.git /var/lib/mock/f45-build-26758-619/root/chroot_tmpdir/scmroot/perl-Test-Modern
Cloning into '/var/lib/mock/f45-build-26758-619/root/chroot_tmpdir/scmroot/perl-Test-Modern'...
$ git fetch origin a3019eaec89e6f702f2291fe963909fa8717c7ee:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Test-Modern
 * [new ref]         a3019eaec89e6f702f2291fe963909fa8717c7ee -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a3019ea Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild