$ git clone -n https://src.fedoraproject.org/rpms/yosys.git /var/lib/mock/f40-build-798736-142016/root/chroot_tmpdir/scmroot/yosys
Cloning into '/var/lib/mock/f40-build-798736-142016/root/chroot_tmpdir/scmroot/yosys'...
$ git fetch origin 51aebfab45fbea9415e7493e40a313425b375a32:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/yosys
 * [new ref]         51aebfab45fbea9415e7493e40a313425b375a32 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 51aebfa update to 0.39 snapshot