$ git clone -n https://src.fedoraproject.org/rpms/perl-Regexp-IPv6.git /var/lib/mock/f45-build-26016-614/root/chroot_tmpdir/scmroot/perl-Regexp-IPv6
Cloning into '/var/lib/mock/f45-build-26016-614/root/chroot_tmpdir/scmroot/perl-Regexp-IPv6'...
$ git fetch origin 1f057d0c96c0bec01c49b34c7053747ec0442708:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Regexp-IPv6
 * [new ref]         1f057d0c96c0bec01c49b34c7053747ec0442708 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1f057d0 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild