$ git clone -n https://src.fedoraproject.org/rpms/gtkwave.git /var/lib/mock/f41-build-side-1-3081584-38960/root/chroot_tmpdir/scmroot/gtkwave
Cloning into '/var/lib/mock/f41-build-side-1-3081584-38960/root/chroot_tmpdir/scmroot/gtkwave'...
$ git fetch origin bf8caf070686b3de7605307ecc32329ad955855a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gtkwave
 * [new ref]         bf8caf070686b3de7605307ecc32329ad955855a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bf8caf0 Update to 3.3.121