$ git clone -n https://src.fedoraproject.org/rpms/python-jnius.git /var/lib/mock/f40-build-807233-145187/root/chroot_tmpdir/scmroot/python-jnius
Cloning into '/var/lib/mock/f40-build-807233-145187/root/chroot_tmpdir/scmroot/python-jnius'...
$ git fetch origin 17e167f77c6b2011cb12e405229a12a47e9f0241:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-jnius
 * [new ref]         17e167f77c6b2011cb12e405229a12a47e9f0241 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 17e167f merge changelog