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Currently if the dpkg-deb command fails you see an error message like this: ERROR: nss-3.27.1-r0 do_package_write_deb: dpkg-deb execution failed ERROR: nss-3.27.1-r0 do_package_write_deb: Function failed: do_package_deb which is pretty much useless. If we use subprocess.check_output, we see a traceback and then: Exception: subprocess.CalledProcessError: Command '<cmd>' returned non-zero exit status 1 Subprocess output: <output> which is much easier to debug from. (From OE-Core rev: 18160442869f56ee71538bc2dc60d7cb6c08c8a2) Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>