Ca-derivations: Difference between revisions

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== Setting-up Nix for CA derivations ==

Being still an experimental feature, CA derivations ~~are~~ currently ~~only available on unstable Nix versions, and~~ require an explicit opt-in.

Being still an experimental feature, CA derivations currently require an explicit opt-in.

=== On NixOS ===

Line 12:

<syntaxhighlight lang="nix">{ pkgs, ... }: {

nix ~~= {~~

nix.settings.experimental-features = [

~~package = pkgs~~.~~nixUnstable;~~

"ca-derivations"

~~extraOptions = ''~~

];

experimental-features = ca-derivations

~~'';~~

};

}</syntaxhighlight>

=== Non NixOS ===

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== Using CA derivations ==

The feature is ~~currently~~ opt-in, meaning that each derivation must individually be marked as content-addressed. When using <code>nixpkgs-unstable</code>, this can be done by setting <code>__contentAddressed = true</code> in the call to mkDerivation.

The feature is opt-in, meaning that each derivation must individually be marked as content-addressed. When using <code>nixpkgs-unstable</code>, this can be done by setting <code>__contentAddressed = true</code> in the call to mkDerivation.

It is also possible to mark all the derivations as content-addressed by default, by passing <code>config.contentAddressedByDefault = true</code> as argument to nixpkgs.

Be warned that although there’s a [https://hydra.ngi0.nixos.org/jobset/ca-test/nixpkgs hydra instance testing ''some stuff''], it’s not a channel blocker, and [https://cache.ngi0.nixos.org its associated binary cache] won’t contain nearly as many things as <code>cache.nixos.org</code>. So doing so will probably entail rebuilding most of your system yourself, and you ''might'' encounter some unexpected breakages.

~~To use the binary cache <code>cache.ngi0.nixos.org</code> to speed up your builds, merge the following into your <code>nix.conf</code>:~~

~~<pre>substituters = https://cache.ngi0.nixos.org/~~

~~trusted-public-keys = cache.ngi0.nixos.org-1:KqH5CBLNSyX184S9BKZJo1LxrxJ9ltnY2uAs5c/f1MA=</pre>~~

== Ensuring that a derivation is properly content-addressed ==

@@ Line 5: / Line 5: @@
 == Setting-up Nix for CA derivations ==
-Being still an experimental feature, CA derivations are currently only available on unstable Nix versions, and require an explicit opt-in.
+Being still an experimental feature, CA derivations currently require an explicit opt-in.
 === On NixOS ===
@@ Line 12: / Line 12: @@
 <syntaxhighlight lang="nix">{ pkgs, ... }: {
-    nix = {
+    nix.settings.experimental-features = [
-    package = pkgs.nixUnstable;
+    "ca-derivations"
-    extraOptions = ''
+  ];
-      experimental-features = ca-derivations
-    '';
-   };
 }</syntaxhighlight>
 === Non NixOS ===
@@ Line 29: / Line 26: @@
 == Using CA derivations ==
-The feature is currently opt-in, meaning that each derivation must individually be marked as content-addressed. When using <code>nixpkgs-unstable</code>, this can be done by setting <code>__contentAddressed = true</code> in the call to mkDerivation.
+The feature is opt-in, meaning that each derivation must individually be marked as content-addressed. When using <code>nixpkgs-unstable</code>, this can be done by setting <code>__contentAddressed = true</code> in the call to mkDerivation.
 It is also possible to mark all the derivations as content-addressed by default, by passing <code>config.contentAddressedByDefault = true</code> as argument to nixpkgs.
-Be warned that although there’s a [https://hydra.ngi0.nixos.org/jobset/ca-test/nixpkgs hydra instance testing ''some stuff''], it’s not a channel blocker, and [https://cache.ngi0.nixos.org its associated binary cache] won’t contain nearly as many things as <code>cache.nixos.org</code>. So doing so will probably entail rebuilding most of your system yourself, and you ''might'' encounter some unexpected breakages.
-To use the binary cache <code>cache.ngi0.nixos.org</code> to speed up your builds, merge the following into your <code>nix.conf</code>:
-<pre>substituters = https://cache.ngi0.nixos.org/
-trusted-public-keys = cache.ngi0.nixos.org-1:KqH5CBLNSyX184S9BKZJo1LxrxJ9ltnY2uAs5c/f1MA=</pre>
 == Ensuring that a derivation is properly content-addressed ==