$ git clone -n https://src.fedoraproject.org/rpms/perl-Readonly.git /var/lib/mock/f45-build-25990-614/root/chroot_tmpdir/scmroot/perl-Readonly
Cloning into '/var/lib/mock/f45-build-25990-614/root/chroot_tmpdir/scmroot/perl-Readonly'...
$ git fetch origin 62e5de950b693046de205dc11d365244fd81533d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Readonly
 * [new ref]         62e5de950b693046de205dc11d365244fd81533d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 62e5de9 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild