$ git clone -n https://src.fedoraproject.org/rpms/plexus-build-api0.git /var/lib/mock/f42-build-3360737-45036/root/chroot_tmpdir/scmroot/plexus-build-api0
Cloning into '/var/lib/mock/f42-build-3360737-45036/root/chroot_tmpdir/scmroot/plexus-build-api0'...
$ git fetch origin 075a0cc254584c3129de8bde272f4fc0e8685fe8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plexus-build-api0
 * [new ref]         075a0cc254584c3129de8bde272f4fc0e8685fe8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 075a0cc Remove javadoc subpackage