$ git clone -n https://src.fedoraproject.org/rpms/rubygem-redis-client.git /var/lib/mock/f45-build-35227-694/root/chroot_tmpdir/scmroot/rubygem-redis-client
Cloning into '/var/lib/mock/f45-build-35227-694/root/chroot_tmpdir/scmroot/rubygem-redis-client'...
$ git fetch origin 535bdf76cb7f7b0069d40740f1a85ccf43e2f5f6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-redis-client
 * [new ref]         535bdf76cb7f7b0069d40740f1a85ccf43e2f5f6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 535bdf7 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild