$ git clone -n https://src.fedoraproject.org/rpms/rubygem-locale.git /var/lib/mock/f40-build-2639258-66348/root/chroot_tmpdir/scmroot/rubygem-locale
Cloning into '/var/lib/mock/f40-build-2639258-66348/root/chroot_tmpdir/scmroot/rubygem-locale'...
$ git fetch origin 736ac7b5bd1c451e2ebc2be870293f7a8834a0a8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-locale
 * [new ref]         736ac7b5bd1c451e2ebc2be870293f7a8834a0a8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 736ac7b 2.1.4