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doc: Manage expectations for eval-cache

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Incorrectly high expectations lead to frustration for users who
stick around to experience how useless it is for e.g. a devShell

https://functional.cafe/@arianvp/112976284363120036:

> Flakes doesn't have eval caching. It has command line argument
> caching. It literally just stores the cli argument you passed
> in a sqlite database and yes that's as useless as it sounds

> When I discovered flakes had no expression level caching whatsoever
> I kind of felt lied to and betrayed.
This commit is contained in:
Robert Hensing 2024-08-17 13:34:45 +02:00
parent 31f3f23ee6
commit b52e58903e
2 changed files with 7 additions and 1 deletions
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2
doc/manual/src/release-notes/rl-2.4.md
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@ -141,6 +141,8 @@ more than 2800 commits from 195 contributors since release 2.3.
the evaluation cache. This is made possible by the hermetic the evaluation cache. This is made possible by the hermetic
evaluation model of flakes. evaluation model of flakes.
Intermediate results are not cached.
* The new `--offline` flag disables substituters and causes all * The new `--offline` flag disables substituters and causes all
locally cached tarballs and repositories to be considered locally cached tarballs and repositories to be considered
up-to-date. up-to-date.

6
src/libexpr/eval-settings.hh
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@ -185,7 +185,11 @@ struct EvalSettings : Config
)"}; )"};
Setting<bool> useEvalCache{this, true, "eval-cache", Setting<bool> useEvalCache{this, true, "eval-cache",
"Whether to use the flake evaluation cache."}; R"(
Whether to use the flake evaluation cache.
Certain commands won't have to evaluate when invoked for the second time with a particular version of a flake.
Intermediate results are not cached.
)"};
Setting<bool> ignoreExceptionsDuringTry{this, false, "ignore-try", Setting<bool> ignoreExceptionsDuringTry{this, false, "ignore-try",
R"( R"(