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Subject: [bug#52805] [PATCH] substitute: Add a =?UTF-8?Q?=E2=80=98--clear-cache=E2=80=99?= option.
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Unlike ‘rm -rf ~/.cache/guix/substitute’ this respects XDG_CACHE_HOME.

Use the --OPTION form for consistency with the existing ‘guix substitute’
interface, where other guix subcommands would prefer an ACTION.  This
subcommand really supports only one OPTION at a time, anyway.

* guix/scripts/substitute.scm (guix-substitute):
Add a new ‘--clear-cache’ option argument.
(show-help): Document it.
---
 guix/scripts/substitute.scm | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/guix/scripts/substitute.scm b/guix/scripts/substitute.scm
index c044e1d47a..1e71b4848b 100755
--- a/guix/scripts/substitute.scm
+++ b/guix/scripts/substitute.scm
@@ -3,6 +3,7 @@
 ;;; Copyright © 2014 Nikita Karetnikov <nikita@HIDDEN>
 ;;; Copyright © 2018 Kyle Meyer <kyle@HIDDEN>
 ;;; Copyright © 2020 Christopher Baines <mail@HIDDEN>
+;;; Copyright © 2021 Tobias Geerinckx-Rice <me@HIDDEN>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -40,7 +41,7 @@ (define-module (guix scripts substitute)
   #:use-module (guix cache)
   #:use-module (gcrypt pk-crypto)
   #:use-module (guix pki)
-  #:use-module ((guix build utils) #:select (mkdir-p))
+  #:use-module ((guix build utils) #:select (delete-file-recursively mkdir-p))
   #:use-module ((guix build download)
                 #:select (uri-abbreviation nar-uri-abbreviation
                           (open-connection-for-uri
@@ -239,6 +240,8 @@ (define-syntax with-networking
 (define (show-help)
   (display (G_ "Usage: guix substitute [OPTION]...
 Internal tool to substitute a pre-built binary to a local build.\n"))
+  (display (G_ "
+      --clear-cache      forget previously cached availability information"))
   (display (G_ "
       --query            report on the availability of substitutes for the
                          store file names passed on the standard input"))
@@ -749,6 +752,10 @@ (define reply-port
   (with-networking
    (with-error-handling                           ; for signature errors
      (match args
+       (("--clear-cache")
+        ;; This is meant to be a big hammer, so don't pussyfoot around with
+        ;; maybe-remove-expired-cache-entries.
+        (delete-file-recursively %narinfo-cache-directory))
        (("--query")
         (let ((acl (current-acl)))
           (let loop ((command (read-line)))
-- 
2.34.0

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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Tobias Geerinckx-Rice <me@HIDDEN>
Subject: bug#52805: Acknowledgement ([PATCH] substitute: Add a
 =?UTF-8?Q?=E2=80=98--clear-cache=E2=80=99?= option.)
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X-Gnu-PR-Message: ack 52805
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Date: Sun, 26 Dec 2021 16:21:01 +0000

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Message sent to guix-patches@HIDDEN:

Subject: [bug#52805] [PATCH] substitute: Add a =?UTF-8?Q?=E2=80=98--clear-cache=E2=80=99?= option.
Resent-From: Mathieu Othacehe <othacehe@HIDDEN>
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Date: Mon, 27 Dec 2021 22:12:28 +0100
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 message of "Sun, 26 Dec 2021 17:21:26 +0100")
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Hello Tobias,

> Unlike =E2=80=98rm -rf ~/.cache/guix/substitute=E2=80=99 this respects XD=
G_CACHE_HOME.

This script is invoked by the daemon as root. In that context,
%narinfo-cache-directory is "/var/guix/substitute/cache", whereas when
run as an user it is likely: "~/.cache/guix/substitute".

That would mean that users need to run "sudo guix substitute
--clear-cache". Moreover this script is an internal undocumented tool,
so I'm not in favor of adding user commands to it.

Maybe "guix gc" would be a better place?

Thanks,

Mathieu

Message sent to guix-patches@HIDDEN:

Subject: [bug#52805] [PATCH] substitute: Add a =?UTF-8?Q?=E2=80=98--clear-cache=E2=80=99?= option.
Resent-From: Tobias Geerinckx-Rice <me@HIDDEN>
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From: Tobias Geerinckx-Rice <me@HIDDEN>
Date: Mon, 27 Dec 2021 22:20:16 +0100
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--=-=-=
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Hi Mathieu,

Thanks for the review!

Mathieu Othacehe =E5=86=99=E9=81=93=EF=BC=9A
> This script is invoked by the daemon as root. In that context,
> %narinfo-cache-directory is "/var/guix/substitute/cache",=20
> whereas when
> run as an user it is likely: "~/.cache/guix/substitute".

Correct.

> That would mean that users need to run "sudo guix substitute
> --clear-cache".

If they want to clear /var instead of ~/.cache, sure.

That sounds like a sane interface, if clearing =E2=80=98root=E2=80=99's cac=
he were=20
the intention?  How would you even do that without sudo,=20
privilege-wise?

> Moreover this script is an internal undocumented tool,
> so I'm not in favor of adding user commands to it.

OK.

The point was to have a little command I could ask other users to=20
run, that's guaranteed to clear the correct directory, and doesn't=20
involve a spooky rm (which saves some back-and-forth :-).

> Maybe "guix gc" would be a better place?

No, I'd rather not add yet another option to =E2=80=98guix gc=E2=80=99 that=
 has=20
nothing to do with GC.

Kind regards,

T G-R

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Hi Tobias,

On Mon, 27 Dec 2021 at 22:20, Tobias Geerinckx-Rice via Guix-patches via <g=
uix-patches@HIDDEN> wrote:

>> Maybe "guix gc" would be a better place?
>
> No, I'd rather not add yet another option to =E2=80=98guix gc=E2=80=99 th=
at has
> nothing to do with GC.

Why?  Well, garbage collection is about automatic memory management and
cache is about efficiency of memory usage.  Therefore, it is appears to
me relevant to have an option =E2=80=9Cguix gc --clear-cache=E2=80=9D to fo=
rce the clean
of various caches.

Cheers,
simon

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Hello,

Tobias Geerinckx-Rice <me@HIDDEN> skribis:

> Mathieu Othacehe =E5=86=99=E9=81=93=EF=BC=9A

[...]

>> Moreover this script is an internal undocumented tool,
>> so I'm not in favor of adding user commands to it.

+1

> The point was to have a little command I could ask other users to run,
> that's guaranteed to clear the correct directory, and doesn't involve
> a spooky rm (which saves some back-and-forth :-).

In which case do users have to =E2=80=98rm -rf ~/.cache/guix/substitute=E2=
=80=99?

That directory is only used by =E2=80=98guix weather=E2=80=99.  In that cas=
e,
=E2=80=98--clear-cache=E2=80=99 could be added to =E2=80=98guix weather=E2=
=80=99 maybe?

Now, ideally there would not be any cache-related option because the
cache would always be valid.  If it=E2=80=99s not, it would be nice to see =
how
that can be improved or mitigated.

Thoughts?

Ludo=E2=80=99.

Last modified: Wed, 5 Jan 2022 21:00:02 UTC

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