GNU bug report logs - #45675
Zip-based archives store timestamps

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Package: guix;

Reported by: Miguel Ángel Arruga Vivas <rosen644835 <at> gmail.com>

Date: Tue, 5 Jan 2021 13:11:02 UTC

Severity: normal

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From: Miguel Ángel Arruga Vivas <rosen644835 <at> gmail.com>
To: 45675 <at> debbugs.gnu.org
Subject: bug#45675: Zip-based archives store timestamps
Date: Tue, 05 Jan 2021 14:10:37 +0100

A procedure like reset-gzip-timestamp should be useful for
reproducibility purposes, adapted to zip based archives as Smalltalk's
STAR or Java's JAR binary formats, as some or all of their contents are
generated usually at build time.

On the latest Zip specification[1], which only seem to be encumbered
regarding encryption, there is one header ID which could be used for
timestamp purposes (0x0020) but third party header IDs are allowed,
which include a "commonly used" 0x5455 timestamp.

[1] https://pkware.cachefly.net/webdocs/APPNOTE/APPNOTE-6.3.8.TXT
This bug report was last modified 4 years and 165 days ago.

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