$ git clone -n https://src.fedoraproject.org/rpms/yosys.git /var/lib/mock/f42-build-879426-182018/root/chroot_tmpdir/scmroot/yosys
Cloning into '/var/lib/mock/f42-build-879426-182018/root/chroot_tmpdir/scmroot/yosys'...
$ git fetch origin 100c32ca1adf47ccf12769d0de05165f50a6c86f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/yosys
 * [new ref]         100c32ca1adf47ccf12769d0de05165f50a6c86f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 100c32c update to 0.50 snapshot