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Re: [PATCH 4/4] environment: Add '--debug' flag.

From: Leo Famulari
Subject: Re: [PATCH 4/4] environment: Add '--debug' flag.
Date: Wed, 20 Jul 2016 00:17:13 -0400
User-agent: Mutt/1.6.0 (2016-04-01)

On Tue, Jul 19, 2016 at 09:02:58PM +0200, David Craven wrote:
> > 1. I'd like to use overlay fs (like docker) and create a new overlay
> > for each phase to easily revert a phase.
> I think this might also help to debug build reproducibility issues, by
> finding out which phase is introducing them. (Or is it always
> obvious?)

In general, the idea of being able to move between phases like that is
really cool. I don't have any experience with overlayfs, so I can't
comment on that detail.

I wouldn't say it's ever obvious where a reproducibility bug is
introduced, but many of them are timestamps, sometimes with an English
string attached, and that code is usually easy to find.

Thankfully, the Reproducible Builds project has a useful database of
bugs they've found:

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