$ git clone -n https://src.fedoraproject.org/rpms/perl-Canary-Stability.git /var/lib/mock/f45-build-22191-590/root/chroot_tmpdir/scmroot/perl-Canary-Stability
Cloning into '/var/lib/mock/f45-build-22191-590/root/chroot_tmpdir/scmroot/perl-Canary-Stability'...
$ git fetch origin d68298b508d6f06e754c7471efaf5f8acb9f37e4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Canary-Stability
 * [new ref]         d68298b508d6f06e754c7471efaf5f8acb9f37e4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d68298b Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild