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simplify note on lazy attribute access #1127

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fricklerhandwerk merged 1 commit into from
Apr 9, 2025
Merged

simplify note on lazy attribute access #1127

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6 changes: 2 additions & 4 deletions source/tutorials/packaging-existing-software.md
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Expand Up @@ -504,7 +504,7 @@ To search derivations on the command line, use `nix-locate` from the [`nix-index

### Adding package sets as dependencies

Add this to your derivation's input attribute set and to `buildInputs`:
Add `xorg` to your derivation's input attribute set and use `xorg.libX11` in `buildInputs`:

```nix
# icat.nix
Expand All @@ -531,9 +531,7 @@ stdenv.mkDerivation {
```

:::{note}
Only add the top-level `xorg` derivation to the input attrset, rather than the full `xorg.libX11`, as the latter would cause a syntax error.

Because Nix is lazily-evaluated, using `xorg.libX11` means that we only include the `libX11` attribute and the derivation doesn't actually include all of `xorg` into the build context.
Because the Nix language is lazily evaluated, accessing only `xorg.libX11` means that the remaining contents of the `xorg` attribute set are never processed.
:::

## Fixing build failures
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