$ git clone -n https://src.fedoraproject.org/rpms/yosys.git /var/lib/mock/f38-build-side-42-init-devel-962028-28791/root/chroot_tmpdir/scmroot/yosys
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-962028-28791/root/chroot_tmpdir/scmroot/yosys'...
$ git fetch origin a5670e364cd6063265610b88eb7c19b9dc87a884:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/yosys
 * [new ref]         a5670e364cd6063265610b88eb7c19b9dc87a884 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a5670e3 update to 0.27 snapshot