$ git clone -n https://src.fedoraproject.org/rpms/rubygem-redis.git /var/lib/mock/f45-build-35249-694/root/chroot_tmpdir/scmroot/rubygem-redis
Cloning into '/var/lib/mock/f45-build-35249-694/root/chroot_tmpdir/scmroot/rubygem-redis'...
$ git fetch origin 84e34003a26c61d967ba01a3ee409bf25bf2a26b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-redis
 * [new ref]         84e34003a26c61d967ba01a3ee409bf25bf2a26b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 84e3400 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild