$ git clone -n https://src.fedoraproject.org/rpms/rubygem-redis-client.git /var/lib/mock/f39-build-1507780-35302/root/chroot_tmpdir/scmroot/rubygem-redis-client
Cloning into '/var/lib/mock/f39-build-1507780-35302/root/chroot_tmpdir/scmroot/rubygem-redis-client'...
$ git fetch origin eed7876496994eb0d88873c793c78d42ce0ee7c3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-redis-client
 * [new ref]         eed7876496994eb0d88873c793c78d42ce0ee7c3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at eed7876 Update to RedisClient 0.15.0.