Docker: Difference between revisions

imported>Asymmetric
Add section on reproducible image creation dates
imported>Asymmetric
m →‎Reproducible image dates: fix date parsing
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The manual advises against using <code>created = "now"</code>, as that prevents images from being reproducible.
The manual advises against using <code>created = "now"</code>, as that prevents images from being reproducible.


An [https://christine.website/blog/nix-flakes-2-2022-02-27 alternative], if using flakes, is to do <code>created = self.lastModifiedDate</code>, which uses the commit date, and is therefore reproducible.
An [https://christine.website/blog/nix-flakes-2-2022-02-27 alternative], if using flakes, is to do <code>created = builtins.substring 0 8 self.lastModifiedDate</code>, which uses the commit date, and is therefore reproducible.


== How to calculate the <code>sha256</code> of a pulled image ==
== How to calculate the <code>sha256</code> of a pulled image ==