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Update doc/builders/fetchers.chapter.md

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Co-authored-by: Valentin Gagarin <valentin.gagarin@tweag.io>
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Cody Hiar 2022-08-02 10:51:09 -06:00 committed by GitHub
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doc/builders/fetchers.chapter.md
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@ -32,7 +32,9 @@ fetchurl {
};
```
Hash mismatches generate an error message containing the correct sha256.
Use the resulting error message to determine the correct hash.
<error message here>
A similar problem arises while testing changes to a fetcher's implementation. If the output of the derivation already exists in the Nix store, test failures can go undetected. The [`invalidateFetcherByDrvHash`](#tester-invalidateFetcherByDrvHash) function helps prevent reusing cached derivations.