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mention the actual meaning of FODs in the glossary (#10888)
* 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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@ -71,10 +71,9 @@
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[`__contentAddressed`](./language/advanced-attributes.md#adv-attr-__contentAddressed)
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attribute set to `true`.
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- [fixed-output derivation]{#gloss-fixed-output-derivation}
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- [fixed-output derivation]{#gloss-fixed-output-derivation} (FOD)
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A derivation which includes the
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[`outputHash`](./language/advanced-attributes.md#adv-attr-outputHash) attribute.
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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.
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- [store]{#gloss-store}
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@ -120,12 +120,11 @@ Derivations can declare some infrequently used optional attributes.
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configuration setting.
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- [`outputHash`]{#adv-attr-outputHash}; [`outputHashAlgo`]{#adv-attr-outputHashAlgo}; [`outputHashMode`]{#adv-attr-outputHashMode}\
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These attributes declare that the derivation is a so-called
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*fixed-output derivation*, which means that a cryptographic hash of
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the output is already known in advance. When the build of a
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fixed-output derivation finishes, Nix computes the cryptographic
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hash of the output and compares it to the hash declared with these
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attributes. If there is a mismatch, the build fails.
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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.
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As opposed to regular derivations, the [`builder`] executable of a fixed-output derivation has access to the network.
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Nix computes a cryptographic hash of its output and compares that to the hash declared with these attributes.
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If there is a mismatch, the derivation fails.
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The rationale for fixed-output derivations is derivations such as
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those produced by the `fetchurl` function. This function downloads a
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@ -279,7 +278,9 @@ Derivations can declare some infrequently used optional attributes.
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> **Note**
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>
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> 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.
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> 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.
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[`builder`]: ./derivations.md#attr-builder
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- [`__structuredAttrs`]{#adv-attr-structuredAttrs}\
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If the special attribute `__structuredAttrs` is set to `true`, the other derivation
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