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Fixup description of substituters (#8291)

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Introduce what substituters "are" in the configuration option entry.
Remove arbitrary line breaks for easier editing in the future.
Link glossary some more.

Co-authored-by: Robert Hensing <roberth@users.noreply.github.com>
Co-authored-by: John Ericson <git@JohnEricson.me>
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Valentin Gagarin 2023-06-14 22:49:58 +02:00 committed by GitHub
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7
doc/manual/src/glossary.md
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@ -112,9 +112,10 @@
from some server.
- [substituter]{#gloss-substituter}\
A *substituter* is an additional store from which Nix will
copy store objects it doesn't have. For details, see the
[`substituters` option](./command-ref/conf-file.md#conf-substituters).
An additional [store]{#gloss-store} from which Nix can obtain store objects instead of building them.
Often the substituter is a [binary cache](#gloss-binary-cache), but any store can serve as substituter.
See the [`substituters` configuration option](./command-ref/conf-file.md#conf-substituters) for details.
[substituter]: #gloss-substituter

17
src/libstore/globals.hh
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@ -691,20 +691,19 @@ public:
Strings{"https://cache.nixos.org/"},
"substituters",
R"(
A list of [URLs of Nix stores](@docroot@/command-ref/new-cli/nix3-help-stores.md#store-url-format)
to be used as substituters, separated by whitespace.
Substituters are tried based on their Priority value, which each substituter can set
independently. Lower value means higher priority.
The default is `https://cache.nixos.org`, with a Priority of 40.
A list of [URLs of Nix stores](@docroot@/command-ref/new-cli/nix3-help-stores.md#store-url-format) to be used as substituters, separated by whitespace.
A substituter is an additional [store]{@docroot@/glossary.md##gloss-store} from which Nix can obtain [store objects](@docroot@/glossary.md#gloss-store-object) instead of building them.
At least one of the following conditions must be met for Nix to use
a substituter:
Substituters are tried based on their priority value, which each substituter can set independently.
Lower value means higher priority.
The default is `https://cache.nixos.org`, which has a priority of 40.
At least one of the following conditions must be met for Nix to use a substituter:
- the substituter is in the [`trusted-substituters`](#conf-trusted-substituters) list
- the user calling Nix is in the [`trusted-users`](#conf-trusted-users) list
In addition, each store path should be trusted as described
in [`trusted-public-keys`](#conf-trusted-public-keys)
In addition, each store path should be trusted as described in [`trusted-public-keys`](#conf-trusted-public-keys)
)",
{"binary-caches"}};