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rewrite runCommand interface docs

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specifically this corrects the misleading statement that `env` takes
environment variables for the derivation.
This commit is contained in:
Valentin Gagarin 2023-09-18 17:47:47 +02:00
parent c62b4a053c
commit 35d066de5f
1 changed files with 19 additions and 2 deletions
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21
doc/builders/trivial-builders.chapter.md
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@ -4,9 +4,25 @@ Nixpkgs provides a couple of functions that help with building derivations. The
## `runCommand` {#trivial-builder-runCommand}
This takes three arguments, `name`, `env`, and `buildCommand`. `name` is just the name that Nix will append to the store path in the same way that `stdenv.mkDerivation` uses its `name` attribute. `env` is an attribute set specifying environment variables that will be set for this derivation. These attributes are then passed to the wrapped `stdenv.mkDerivation`. `buildCommand` specifies the commands that will be run to create this derivation. Note that you will need to create `$out` for Nix to register the command as successful.
`runCommand :: String -> AttrSet -> String -> Derivation`
An example of using `runCommand` is provided below.
`runCommand name drvAttrs buildCommand` returns a derivation that is built by running the specified shell commands.
`name :: String`
: The name that Nix will append to the store path in the same way that `stdenv.mkDerivation` uses its `name` attribute.
`drvAttr :: AttrSet`
: Attributes to pass to the underlying call to [`stdenv.mkDerivation`](#chap-stdenv).
`buildCommand :: String`
: Shell commands to run in the derivation builder.
::: {.note}
You have to create a file or directory `$out` for Nix to be able to run the builder successfully.
:::
::: {.example #ex-runcommand-simple}
# Invocation of `runCommand`
```nix
(import <nixpkgs> {}).runCommand "my-example" {} ''
@ -28,6 +44,7 @@ An example of using `runCommand` is provided below.
date
''
```
:::
## `runCommandCC` {#trivial-builder-runCommandCC}