$ git clone -n https://src.fedoraproject.org/rpms/yosys.git /var/lib/mock/f40-build-1284967-23240/root/chroot_tmpdir/scmroot/yosys
Cloning into '/var/lib/mock/f40-build-1284967-23240/root/chroot_tmpdir/scmroot/yosys'...
$ git fetch origin 8d9a876823cb89bbb3a5ebf89b7c056c02bb0aad:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/yosys
 * [new ref]         8d9a876823cb89bbb3a5ebf89b7c056c02bb0aad -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8d9a876 update to 0.42