$ git clone -n https://src.fedoraproject.org/rpms/rubygem-vte3.git /var/lib/mock/f40-build-1780623-24818/root/chroot_tmpdir/scmroot/rubygem-vte3
Cloning into '/var/lib/mock/f40-build-1780623-24818/root/chroot_tmpdir/scmroot/rubygem-vte3'...
$ git fetch origin ff2563f7903277a3edc80224b084752837468331:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-vte3
 * [new ref]         ff2563f7903277a3edc80224b084752837468331 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ff2563f 4.2.2 entry