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mention the actual meaning of FODs in the glossary (#10888)

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* mention the actual meaning of FODs in the glossary

Co-authored-by: Alex Groleau <source@proof.construction>
Co-authored-by: Daniel Baker <daniel.n.baker@gmail.com>
Co-authored-by: Robert Hensing <roberth@users.noreply.github.com>
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Valentin Gagarin 2024-06-10 20:50:35 +02:00 committed by GitHub
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5
doc/manual/src/glossary.md
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@ -71,10 +71,9 @@
[`__contentAddressed`](./language/advanced-attributes.md#adv-attr-__contentAddressed) [`__contentAddressed`](./language/advanced-attributes.md#adv-attr-__contentAddressed)
attribute set to `true`. attribute set to `true`.
- [fixed-output derivation]{#gloss-fixed-output-derivation} - [fixed-output derivation]{#gloss-fixed-output-derivation} (FOD)
A derivation which includes the A [derivation] where a cryptographic hash of the [output] is determined in advance using the [`outputHash`](./language/advanced-attributes.md#adv-attr-outputHash) attribute, and where the [`builder`](@docroot@/language/derivations.md#attr-builder) executable has access to the network.
[`outputHash`](./language/advanced-attributes.md#adv-attr-outputHash) attribute.
- [store]{#gloss-store} - [store]{#gloss-store}

15
doc/manual/src/language/advanced-attributes.md
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@ -120,12 +120,11 @@ Derivations can declare some infrequently used optional attributes.
configuration setting. configuration setting.
- [`outputHash`]{#adv-attr-outputHash}; [`outputHashAlgo`]{#adv-attr-outputHashAlgo}; [`outputHashMode`]{#adv-attr-outputHashMode}\ - [`outputHash`]{#adv-attr-outputHash}; [`outputHashAlgo`]{#adv-attr-outputHashAlgo}; [`outputHashMode`]{#adv-attr-outputHashMode}\
These attributes declare that the derivation is a so-called These attributes declare that the derivation is a so-called *fixed-output derivation* (FOD), which means that a cryptographic hash of the output is already known in advance.
*fixed-output derivation*, which means that a cryptographic hash of
the output is already known in advance. When the build of a As opposed to regular derivations, the [`builder`] executable of a fixed-output derivation has access to the network.
fixed-output derivation finishes, Nix computes the cryptographic Nix computes a cryptographic hash of its output and compares that to the hash declared with these attributes.
hash of the output and compares it to the hash declared with these If there is a mismatch, the derivation fails.
attributes. If there is a mismatch, the build fails.
The rationale for fixed-output derivations is derivations such as The rationale for fixed-output derivations is derivations such as
those produced by the `fetchurl` function. This function downloads a those produced by the `fetchurl` function. This function downloads a
@ -279,7 +278,9 @@ Derivations can declare some infrequently used optional attributes.
> **Note** > **Note**
> >
> If set to `false`, the [`builder`](./derivations.md#attr-builder) should be able to run on the system type specified in the [`system` attribute](./derivations.md#attr-system), since the derivation cannot be substituted. > If set to `false`, the [`builder`] should be able to run on the system type specified in the [`system` attribute](./derivations.md#attr-system), since the derivation cannot be substituted.
[`builder`]: ./derivations.md#attr-builder
- [`__structuredAttrs`]{#adv-attr-structuredAttrs}\ - [`__structuredAttrs`]{#adv-attr-structuredAttrs}\
If the special attribute `__structuredAttrs` is set to `true`, the other derivation If the special attribute `__structuredAttrs` is set to `true`, the other derivation