$ git clone -n https://src.fedoraproject.org/rpms/kmailtransport.git /var/lib/mock/f42-build-880797-183007/root/chroot_tmpdir/scmroot/kmailtransport
Cloning into '/var/lib/mock/f42-build-880797-183007/root/chroot_tmpdir/scmroot/kmailtransport'...
$ git fetch origin 53a5ea8663b677e37140b8aa335edeba9cc2f1aa:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kmailtransport
 * [new ref]         53a5ea8663b677e37140b8aa335edeba9cc2f1aa -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 53a5ea8 Rebuild for ppc64le enablement