$ git clone -n https://src.fedoraproject.org/rpms/maven-plugin-testing.git /var/lib/mock/f42-build-3409137-45146/root/chroot_tmpdir/scmroot/maven-plugin-testing
Cloning into '/var/lib/mock/f42-build-3409137-45146/root/chroot_tmpdir/scmroot/maven-plugin-testing'...
$ git fetch origin 25ae5abb0698fab46353ef6ebc4760a97bbc18b2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/maven-plugin-testing
 * [new ref]         25ae5abb0698fab46353ef6ebc4760a97bbc18b2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 25ae5ab Remove javadoc subpackage