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add more details on CA derivations

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Valentin Gagarin 2023-07-19 13:59:18 +02:00
parent 5f37ebcf83
commit 2fa90e5824
2 changed files with 11 additions and 7 deletions
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2
doc/manual/src/language/advanced-attributes.md
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@ -229,6 +229,8 @@ Derivations can declare some infrequently used optional attributes.
[`outputHashAlgo`](#adv-attr-outputHashAlgo)
like for *fixed-output derivations* (see above).
It also implicitly requires that the machine to build the derivation must have the `ca-derivations` [system feature](@docroot@/command-ref/conf-file.md#conf-system-features).
- [`passAsFile`]{#adv-attr-passAsFile}\
A list of names of attributes that should be passed via files rather
than environment variables. For example, if you have

16
src/libstore/globals.hh
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@ -693,25 +693,27 @@ public:
This complements the [`system`](#conf-system) and [`extra-platforms`](#conf-extra-platforms) configuration options and the corresponding [`system`](@docroot@/language/derivations.md#attr-system) attribute on derivations.
Derivations can require system features in the derivation attribute [`requiredSystemFeatures`](@docroot@/language/advanced-attributes.md#adv-attr-requiredSystemFeatures).
A derivation can require system features in the [`requiredSystemFeatures` attribute](@docroot@/language/advanced-attributes.md#adv-attr-requiredSystemFeatures), and the machine to build the derivation must have them.
System features are generally user-defined, but the following have special treatment:
System features are user-defined, but Nix sets the following defaults:
- `kvm`
Set by default if `/dev/kvm` is accessible.
Included by default if `/dev/kvm` is accessible.
- `nixos-test`, `benchmark`, `big-parallel`
These historical pseudo-features are always enabled for backwards compatibility, used in Nixpkgs to route Hydra builds to specific machines.
These historical pseudo-features are always enabled for backwards compatibility, as they are used in Nixpkgs to route Hydra builds to specific machines.
- `ca-derivations`
Set by default if the [`ca-derivations` experimental feature](@docroot@/contributing/experimental-features.md#xp-feature-ca-derivations) is enabled.
Included by default if the [`ca-derivations` experimental feature](@docroot@/contributing/experimental-features.md#xp-feature-ca-derivations) is enabled.
This system feature is implicitly required by derivations with the [`__contentAddressed` attribute](@docroot@/language/advanced-attributes.md#adv-attr-__contentAddressed).
- `recursive-nix`
Set by default if the [`recursive-nix` experimental feature](@docroot@/contributing/experimental-features.md#xp-feature-recursive-nix) is enabled.
Included by default if the [`recursive-nix` experimental feature](@docroot@/contributing/experimental-features.md#xp-feature-recursive-nix) is enabled.
- `uid-range`
@ -720,7 +722,7 @@ public:
[nspawn]: https://github.com/NixOS/nix/blob/67bcb99700a0da1395fa063d7c6586740b304598/tests/systemd-nspawn.nix.
Set by default on Linux if the [`auto-allocate-uids`](#conf-auto-allocate-uids) setting is enabled.
Included by default on Linux if the [`auto-allocate-uids`](#conf-auto-allocate-uids) setting is enabled.
)", {}, false};
Setting<Strings> substituters{