$ git clone -n https://src.fedoraproject.org/rpms/maven-source-plugin.git /var/lib/mock/f40-build-2133934-50815/root/chroot_tmpdir/scmroot/maven-source-plugin
Cloning into '/var/lib/mock/f40-build-2133934-50815/root/chroot_tmpdir/scmroot/maven-source-plugin'...
$ git fetch origin 0d778a977115d6c4aa62de02373293ae4b79322f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/maven-source-plugin
 * [new ref]         0d778a977115d6c4aa62de02373293ae4b79322f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0d778a9 Update javapackages test plan to f40