[Buildroot] [PATCH v5 08/19] reproducible: try to detect most common errors

[Yann E. MORIN <yann.morin.1998@free.fr>]

Thomas, J?r?me, All,

On 2017-04-01 16:50 +0200, Thomas Petazzoni spake thusly:
> On Tue, 20 Dec 2016 14:46:25 +0100, J?r?me Pouiller wrote:
> > Some package includes some information from build environment in their results.
> > This practice is incompatible with reproducible builds.
> > 
> > This patch scans final target to research most common patterns.
> > 
> > Since we only search fixed strings (grep is called with -F), this search is
> > fast (on my station, 60ms for a target of 40MB).
> > 
> > Note, it could be a good idea to also match current user name. However, build
> > path often contains username and, until now, we do not try to avoid build path
> > in result.
> > 
> > Signed-off-by: J?r?me Pouiller <jezz@sysmic.org>
> 
> I am not entirely convinced it makes sense to grep more or less
> randomly in all files specifically for those strings.

Indeed. My hostnames usually cary some computer-related keywords, which
can very well occur in binary files (e.g. 'segfault').

> Or perhaps, we should have a separate shell scripts that checks for
> several classes of obviously non-reproducible behaviors?

Indeed, but such a script can only be a helper that a user would
voluntarily run on their own.

We can't have such a script automatically run, because those strings can
be too common.

Regards,
Yann E. MORIN.

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