$ git clone -n https://src.fedoraproject.org/rpms/xkeycaps.git /var/lib/mock/f40-build-804780-144613/root/chroot_tmpdir/scmroot/xkeycaps
Cloning into '/var/lib/mock/f40-build-804780-144613/root/chroot_tmpdir/scmroot/xkeycaps'...
$ git fetch origin 522599ce43bd477261a1190b46e93a6b0f15a3c6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xkeycaps
 * [new ref]         522599ce43bd477261a1190b46e93a6b0f15a3c6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 522599c fix cast issues causing FTBFS