From mboxrd@z Thu Jan  1 00:00:00 1970
From: =?utf-8?Q?Cl=C3=A9ment?= Lassieur <clement@lassieur.org>
Subject: Re: GSoC: Adding a web interface similar to the Hydra web interface
Date: Wed, 18 Jul 2018 12:19:08 +0200
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To: Tatiana Sholokhova <tanja201396@gmail.com>
Cc: guix-devel <guix-devel@gnu.org>

Hi Tatiana,

Tatiana Sholokhova <tanja201396@gmail.com> writes:

> Am I right that in terms of Cuirass database derivations correspond to
> jobs?

Yes, but to be more precise, a job is a structure containing:
  - derivation
  - job-name
  - system
  - nix-name
  - eval-id

The database table called "Derivations" should be called "Jobs", so the
name is confusing indeed.

A derivation, as Ricardo explained, is a file (.drv) representing
low-level build actions and the environment in which they are performed.

At each evaluation, there is a new set of jobs returned by the
evaluator, each job having its 'eval-id' incremented.  That means that
two different jobs for the same job-name (i.e. linux-libre-4.17.6-job)
could embed the same derivation.  In that case, it's useless to build
that job in my opinion, see that bug[1].

I hope it's clearer,
Cl=C3=A9ment

[1]: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D32190