Nix Hash: Difference between revisions
→Updating Packages: Sentence case, demote to <h3>
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The format of the hash follows the [https://www.w3.org/TR/SRI/#introduction SRI (Subresource Integrity)] specification. | The format of the hash follows the [https://www.w3.org/TR/SRI/#introduction SRI (Subresource Integrity)] specification. | ||
== Updating | === Updating packages === | ||
[https://nixos.org/manual/nixpkgs/stable/#chap-pkgs-fetchers-caveats Using TOFU to get the new hash] | [https://nixos.org/manual/nixpkgs/stable/#chap-pkgs-fetchers-caveats Using TOFU to get the new hash] | ||
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For <code>fetchurl</code>, the option to switch between both is called <code>recursiveHash</code> and defaults to <code>false</code>. | For <code>fetchurl</code>, the option to switch between both is called <code>recursiveHash</code> and defaults to <code>false</code>. | ||
<code>fetchzip</code> on the other hand will download the file, unzip it and then recursively hash the output. There's no option. | <code>fetchzip</code> on the other hand will download the file, unzip it and then recursively hash the output. There's no option. The motivation behind this is that sometimes, the content is always the same, but the archive may change. This is because zip files are inherently non-deterministic, and might be generated automatically. If they are regenerated, they'll have a different hash, although the content is the same. <code>recursiveHash</code> works around that. | ||
The motivation behind this is that sometimes, the content is always the same, but the archive may change. This is because zip files are inherently non-deterministic, and might be generated automatically. If they are regenerated, they'll have a different hash, although the content is the same. <code>recursiveHash</code> works around that. | |||
== Tools == | == Tools == | ||