$ git clone -n https://src.fedoraproject.org/rpms/abrt.git /var/lib/mock/f41-build-1284192-23222/root/chroot_tmpdir/scmroot/abrt
Cloning into '/var/lib/mock/f41-build-1284192-23222/root/chroot_tmpdir/scmroot/abrt'...
$ git fetch origin 66812b6c9237d7d854469e95777c0b953e0a94a3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/abrt
 * [new ref]         66812b6c9237d7d854469e95777c0b953e0a94a3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 66812b6 Drop call to marshalparser