From: "Ludovic Courtès" <ludo@gnu.org>
To: Lars-Dominik Braun <lars@6xq.net>
Cc: 48933@debbugs.gnu.org, jlicht@fsfe.org
Subject: [bug#48933] [PATCH] build: Make outputs of node-build-system reproducible.
Date: Wed, 16 Jun 2021 22:51:59 +0200 [thread overview]
Message-ID: <87bl85pm6o.fsf@gnu.org> (raw)
In-Reply-To: <YMC6mp3HDmRyjAd4@noor.fritz.box> (Lars-Dominik Braun's message of "Wed, 9 Jun 2021 14:56:58 +0200")
Hi,
Lars-Dominik Braun <lars@6xq.net> skribis:
> package.json records two hashes of package.tgz, which change for each
> build, resulting in non-reproducible builds.
>
> * guix/build/node-build-system.scm (repack): Add reproducibility options
> to tar command.
Yay!
> (define* (repack #:key inputs #:allow-other-keys)
> - (invoke "tar" "-czf" "../package.tgz" ".")
> + (invoke "tar"
> + ;; Add options suggested by https://reproducible-builds.org/docs/archives/
> + "--sort=name"
> + (string-append "--mtime=" (getenv "SOURCE_DATE_EPOCH"))
I think it should be "--mtime=@".
> + "--owner=0"
> + "--group=0"
> + "--numeric-owner"
> + "--pax-option=exthdr.name=%d/PaxHeaders/%f,delete=atime,delete=ctime"
> + "-czf" "../package.tgz" ".")
I didn’t know about this ‘--pax-option’ trick; since it’s only useful
when POSIXLY_CORRECT is set, perhaps we can remove it?
(guix docker) does this:
--8<---------------cut here---------------start------------->8---
(define %tar-determinism-options
;; GNU tar options to produce archives deterministically.
'("--sort=name" "--mtime=@1"
"--owner=root:0" "--group=root:0"
;; When 'build-docker-image' is passed store items, the 'nlink' of the
;; files therein leads tar to store hard links instead of actual copies.
;; However, the 'nlink' count depends on deduplication in the store; it's
;; an "implicit input" to the build process. '--hard-dereference'
;; eliminates it.
"--hard-dereference"))
--8<---------------cut here---------------end--------------->8---
and (guix packages) does something similar.
So ‘--sort=name’ seems to be missing.
HTH,
Ludo’.
next prev parent reply other threads:[~2021-06-16 21:06 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-09 12:56 [bug#48933] [PATCH] build: Make outputs of node-build-system reproducible Lars-Dominik Braun
2021-06-16 20:51 ` Ludovic Courtès [this message]
2021-06-17 12:12 ` Lars-Dominik Braun
2021-06-20 20:58 ` Ludovic Courtès
2021-06-24 12:12 ` bug#48933: " Lars-Dominik Braun
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