$ git clone -n https://src.fedoraproject.org/rpms/kstars.git /var/lib/mock/f40-build-2405543-60558/root/chroot_tmpdir/scmroot/kstars
Cloning into '/var/lib/mock/f40-build-2405543-60558/root/chroot_tmpdir/scmroot/kstars'...
$ git fetch origin 7db8b39adceb9f142057f98ddc7d3b01aea8abcb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kstars
 * [new ref]         7db8b39adceb9f142057f98ddc7d3b01aea8abcb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7db8b39 fixed bz#2260906 - F40FailsToInstall