Re: Dropping gzip-compressed substitutes

[Mathieu Othacehe]

Hey Maxim,

Sound like a fine plan.

> 1.  Promptly set up both a blog post and a NEWS entry announcing the
> support for gzip substitutes is about to be phased out from the build
> farm (1 month notice), urging users to upgrade their daemon to a version
>>= 1.1.0.

I addition, we could warn users with old daemons as proposed by Ludo &
Ricardo. There's an attached patch here.

> -                   ;; TODO: Eventually, disable gzip, as discussed at
> -                   ;; 
> <https://lists.gnu.org/archive/html/guix-devel/2021-03/msg00333.html>.
> -                   (compression '(("gzip" 9) ("lzip" 9) ("zstd" 19)))
> +                   (compression '(("lzip" 9) ("zstd" 19)))
>                     (cache-bypass-threshold cache-bypass-threshold)
>                     (workers publish-workers)))

Nice.

> 3. Come up with a Guile script that is able to
>
>   a) Strip gzip-related metadata from the .narinfo guix-publish metadata
>   files
>   b) recompute and update their 'Signature' field.
>
> 4. Finally, 'rm -r /var/guix/publish/gzip' and free about 6.5 TiB of data.

I hope the script will be able to complete within a reasonable amount of
time, but we cannot know before trying it out :).

Thanks,

Mathieu

>From bd306a8b20f2033d67755dd332a5d33b2f6b822d Mon Sep 17 00:00:00 2001
From: Mathieu Othacehe <othacehe@gnu.org>
Date: Tue, 8 Feb 2022 14:28:56 +0100
Subject: [PATCH 1/1] store: Warn about daemon deprecation.

* guix/deprecation.scm (warn-about-old-daemon): New procedure.
* guix/store.scm (build-things): Use it to warn about old daemons.
---
 guix/deprecation.scm | 7 +++++++
 guix/store.scm       | 2 ++
 2 files changed, 9 insertions(+)

diff --git a/guix/deprecation.scm b/guix/deprecation.scm
index c66c9367f6..666e178d75 100644
--- a/guix/deprecation.scm
+++ b/guix/deprecation.scm
@@ -1,5 +1,6 @@
 ;;; GNU Guix --- Functional package management for GNU
 ;;; Copyright © 2019, 2020, 2021 Ludovic Courtès <ludo@gnu.org>
+;;; Copyright © 2021 Mathieu Othacehe <othacehe@gnu.org>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -24,6 +25,8 @@ (define-module (guix deprecation)
 
             define-deprecated/public
             define-deprecated/alias
+
+            warn-about-old-daemon
             warn-about-deprecation))
 
 ;;; Commentary:
@@ -32,6 +35,10 @@ (define-module (guix deprecation)
 ;;;
 ;;; Code:
 
+(define (warn-about-old-daemon)
+  (warning (G_ "Your Guix daemon is seriously outdated, please consider
+ updating it by following the 'Upgrading Guix' documentation section.~%")))
+
 (define* (warn-about-deprecation variable properties
                                  #:key replacement)
   (let ((location (and properties (source-properties->location properties))))
diff --git a/guix/store.scm b/guix/store.scm
index a93e9596d9..11dfc095b1 100644
--- a/guix/store.scm
+++ b/guix/store.scm
@@ -1442,6 +1442,8 @@ (define build-things
                              things)))
             (parameterize ((current-store-protocol-version
                             (store-connection-version store)))
+              (when (< (current-store-protocol-version) 355) ;0x163
+                (warn-about-old-daemon))
               (if (>= (store-connection-minor-version store) 15)
                   (build store things mode)
                   (if (= mode (build-mode normal))
-- 
2.34.0