$ git clone -n https://src.fedoraproject.org/rpms/perl-Contextual-Return.git /var/lib/mock/f45-build-22551-593/root/chroot_tmpdir/scmroot/perl-Contextual-Return
Cloning into '/var/lib/mock/f45-build-22551-593/root/chroot_tmpdir/scmroot/perl-Contextual-Return'...
$ git fetch origin 8c11c24a5693723dd4d93aa2eb08a53108083901:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Contextual-Return
 * [new ref]         8c11c24a5693723dd4d93aa2eb08a53108083901 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8c11c24 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild