$ git clone -n https://src.fedoraproject.org/rpms/ghostwriter.git /var/lib/mock/f40-build-2209583-52157/root/chroot_tmpdir/scmroot/ghostwriter
Cloning into '/var/lib/mock/f40-build-2209583-52157/root/chroot_tmpdir/scmroot/ghostwriter'...
$ git fetch origin 18cb0641d2f725251062a048768e0fd77cd5810c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghostwriter
 * [new ref]         18cb0641d2f725251062a048768e0fd77cd5810c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 18cb064 Updated BR and docs