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Add example error message.

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This commit is contained in:
Cody Hiar 2022-08-02 11:07:36 -06:00
parent 9c292dd02e
commit 3c2cd351d4
1 changed files with 5 additions and 1 deletions
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6
doc/builders/fetchers.chapter.md
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@ -39,7 +39,11 @@ fetchurl {
Use the resulting error message to determine the correct hash.
<error message here>
```
error: hash mismatch in fixed-output derivation '/path/to/my.drv':
specified: sha256-AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=
got: sha256-RApQUm78dswhBLC/rfU9y0u6pSAzHceIJqgmetRD24E=
```
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.