$ git clone -n https://src.fedoraproject.org/rpms/jasper.git /var/lib/mock/f40-build-2199444-51742/root/chroot_tmpdir/scmroot/jasper
Cloning into '/var/lib/mock/f40-build-2199444-51742/root/chroot_tmpdir/scmroot/jasper'...
$ git fetch origin febc6821b42ef489c4c805ff27421c83b586b04b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jasper
 * [new ref]         febc6821b42ef489c4c805ff27421c83b586b04b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at febc682 New sources