$ git clone -n https://src.fedoraproject.org/rpms/pentaho-libxml.git /var/lib/mock/f41-build-1280363-23185/root/chroot_tmpdir/scmroot/pentaho-libxml
Cloning into '/var/lib/mock/f41-build-1280363-23185/root/chroot_tmpdir/scmroot/pentaho-libxml'...
$ git fetch origin 2906f086cb94ec1458ba38fc40f9e054b4ef810a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/pentaho-libxml
 * [new ref]         2906f086cb94ec1458ba38fc40f9e054b4ef810a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2906f08 Eliminate use of obsolete %patchN syntax (#2283636)