$ git clone -n https://src.fedoraproject.org/rpms/gtkwave.git /var/lib/mock/f42-build-side-1-3584367-46893/root/chroot_tmpdir/scmroot/gtkwave
Cloning into '/var/lib/mock/f42-build-side-1-3584367-46893/root/chroot_tmpdir/scmroot/gtkwave'...
$ git fetch origin 5855059299b864b933bc4b1548a84d7657ee8940:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gtkwave
 * [new ref]         5855059299b864b933bc4b1548a84d7657ee8940 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5855059 Update to 3.3.124