If we run "bitbake -S base-files" today, and re-run it tomorrow with nothing changed, we would see that the do_install.sigdata changes because: do_intall -> do_install_basefilesissue -> DISTRO_VERSION -> DATE Add this to base-files_3.0.14.bb will fix the problem: DISTRO_VERSION[vardepsexclude] = "DATE"
http://git.yoctoproject.org/cgit.cgi/poky/commit/?id=2614e613e035d72e293e6da3b91a071be10ca78e