$ git clone -n https://src.fedoraproject.org/rpms/xml-commons-apis.git /var/lib/mock/f40-build-2131739-50807/root/chroot_tmpdir/scmroot/xml-commons-apis
Cloning into '/var/lib/mock/f40-build-2131739-50807/root/chroot_tmpdir/scmroot/xml-commons-apis'...
$ git fetch origin 776545f672cef7c101a10d80e2d6536ec5049dde:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xml-commons-apis
 * [new ref]         776545f672cef7c101a10d80e2d6536ec5049dde -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 776545f Update javapackages test plan to f40