$ git clone -n https://src.fedoraproject.org/rpms/yosys.git /var/lib/mock/f42-build-side-1-3586747-46925/root/chroot_tmpdir/scmroot/yosys
Cloning into '/var/lib/mock/f42-build-side-1-3586747-46925/root/chroot_tmpdir/scmroot/yosys'...
$ git fetch origin 561e30a9495e664148ab44be7112260f7f739535:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/yosys
 * [new ref]         561e30a9495e664148ab44be7112260f7f739535 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 561e30a update to 0.55 snapshot