$ git clone -n https://src.fedoraproject.org/rpms/ksirk.git /var/lib/mock/f41-build-860385-168945/root/chroot_tmpdir/scmroot/ksirk
Cloning into '/var/lib/mock/f41-build-860385-168945/root/chroot_tmpdir/scmroot/ksirk'...
$ git fetch origin 35936ed42005b7e6fb169a4b6725861682ee7c0e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ksirk
 * [new ref]         35936ed42005b7e6fb169a4b6725861682ee7c0e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 35936ed 24.08.2