Re: [RFC PATCH 0/3] Reproducible build

[Henning Schild <henning.schild@siemens.com>]

Am Wed, 23 May 2018 08:32:03 +0200
schrieb "[ext] claudius.heine.ext@siemens.com"
<claudius.heine.ext@siemens.com>:

> From: Claudius Heine <ch@denx.de>
> 
> Hi,
> 
> this patchset contains a implementation of my proposed solution for
> reproducible builds.
> 
> I am currenlty not quite sure if that is the right approach, but it is
> the simplest I can think of currently.

I did not look at the patches yet. And because it sounds so simple my
first reaction is that it can not be complete.
One thing we will need for sure is the sources that lead to the
packages we built ourselfs, otherwise we can not rebuild them later on.
And that seems to be a tricky part, not covered by stealing the cache.
Maybe stealing the DLDIR of bitbake as well?

> As already described in my proposal, this patchset does the following:
> 
>   1. Takes care that the package cache in the isar-bootstrap root file
>      system contains all the packages used for this
> distro/architecture. 2. A tarball is created after the package cache
> contains all the packages needed by the image.

Are you sure that "apt-get clean" is the only reason for cache
eviction? What will happen if i install a ton of packages, not that apt
will want to safe space at some point.

Henning

>   3. This tarball can be used as the basis of subsequent builds by
>      setting a bitbake variable.
> 
> This is just a first draft of this feature, maybe we can further
> improve some steps and maybe there are better ideas to improve the
> usability.
> 
> Cheers,
> Claudius
> 
> Claudius Heine (3):
>   meta/isar-bootstrap-helper+dpkg.bbclass: bind mount
>     /var/cache/apt/archives
>   meta/classes/image: added isar_bootstrap_tarball task
>   meta/isar-bootstrap: add 'do_restore_from_tarball' task
> 
>  meta/classes/dpkg.bbclass                     |  5 ++++
>  meta/classes/image.bbclass                    | 10 +++++++
>  meta/classes/isar-bootstrap-helper.bbclass    |  9 ++++++-
>  .../isar-bootstrap/isar-bootstrap.bb          | 27
> ++++++++++++++++++- 4 files changed, 49 insertions(+), 2 deletions(-)
>