$ git clone -n https://src.fedoraproject.org/rpms/khal.git /var/lib/mock/f42-build-side-1-3588140-46943/root/chroot_tmpdir/scmroot/khal
Cloning into '/var/lib/mock/f42-build-side-1-3588140-46943/root/chroot_tmpdir/scmroot/khal'...
$ git fetch origin fa6bcabb6b26cb29ab597095b8dc598c1569e52c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/khal
 * [new ref]         fa6bcabb6b26cb29ab597095b8dc598c1569e52c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fa6bcab Fix localize method missing (rhbz#2369815)