linux-kernel - Re: [PATCH 1/2] selftests: firmware: remove use of non-standard diff -Z option

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Message-ID: <20181130023732.GO4922@garbanzo.do-not-panic.com>
Date:   Thu, 29 Nov 2018 18:37:32 -0800
From:   Luis Chamberlain <mcgrof@...nel.org>
To:     Dan Rue <dan.rue@...aro.org>
Cc:     linux-kernel@...r.kernel.org, Shuah Khan <shuah@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kees Cook <keescook@...omium.org>,
        linux-kselftest@...r.kernel.org
Subject: Re: [PATCH 1/2] selftests: firmware: remove use of non-standard diff
 -Z option

On Mon, Nov 26, 2018 at 09:12:15PM -0600, Dan Rue wrote:
> diff -Z is used to trim the trailing whitespace when comparing the
> loaded firmware file with the source firmware file. However, per the
> comment in the source code, -Z should not be necessary. In testing, the
> input and output files are identical.
> 
> Additionally, -Z is not a standard option and is not available in
> environments such as busybox. When -Z is not supported, diff fails with
> a usage error, which is suppressed, but then causes read_firmwares() to
> exit with a false failure message.

NACK -- this breaks testing on debian:

Testing with the file present...
Batched request_firmware() try #1: Files
/tmp/tmp.8GWkoSo5jZ/test-firmware.bin and
/sys/devices/virtual/misc/test_firmware/read_firmware differ
request #0: firmware was not loaded

Please add a quirks check, enable it by default, and remove it for
Busybox.

   Luis