mirror of
https://github.com/NixOS/nixpkgs.git
synced 2024-11-15 06:14:57 +01:00
75 lines
2.3 KiB
Markdown
75 lines
2.3 KiB
Markdown
# Development Shell helpers {#chap-devShellTools}
|
|
|
|
The `nix-shell` command has popularized the concept of transient shell environments for development or testing purposes.
|
|
<!--
|
|
We should try to document the product, not its development process in the Nixpkgs reference manual,
|
|
but *something* needs to be said to provide context for this library.
|
|
This is the most future proof sentence I could come up with while Nix itself does yet make use of this.
|
|
Relevant is the current status of the devShell attribute "project": https://github.com/NixOS/nix/issues/7501
|
|
-->
|
|
However, `nix-shell` is not the only way to create such environments, and even `nix-shell` itself can indirectly benefit from this library.
|
|
|
|
This library provides a set of functions that help create such environments.
|
|
|
|
## `devShellTools.valueToString` {#sec-devShellTools-valueToString}
|
|
|
|
Converts Nix values to strings in the way the [`derivation` built-in function](https://nix.dev/manual/nix/2.23/language/derivations) does.
|
|
|
|
:::{.example}
|
|
## `valueToString` usage examples
|
|
|
|
```nix
|
|
devShellTools.valueToString (builtins.toFile "foo" "bar")
|
|
=> "/nix/store/...-foo"
|
|
```
|
|
|
|
```nix
|
|
devShellTools.valueToString false
|
|
=> ""
|
|
```
|
|
|
|
:::
|
|
|
|
## `devShellTools.unstructuredDerivationInputEnv` {#sec-devShellTools-unstructuredDerivationInputEnv}
|
|
|
|
Convert a set of derivation attributes (as would be passed to [`derivation`]) to a set of environment variables that can be used in a shell script.
|
|
This function does not support `__structuredAttrs`, but does support `passAsFile`.
|
|
|
|
:::{.example}
|
|
## `unstructuredDerivationInputEnv` usage example
|
|
|
|
```nix
|
|
devShellTools.unstructuredDerivationInputEnv {
|
|
drvAttrs = {
|
|
name = "foo";
|
|
buildInputs = [ hello figlet ];
|
|
builder = bash;
|
|
args = [ "-c" "${./builder.sh}" ];
|
|
};
|
|
}
|
|
=> {
|
|
name = "foo";
|
|
buildInputs = "/nix/store/...-hello /nix/store/...-figlet";
|
|
builder = "/nix/store/...-bash";
|
|
}
|
|
```
|
|
|
|
Note that `args` is not included, because Nix does not added it to the builder process environment.
|
|
|
|
:::
|
|
|
|
## `devShellTools.derivationOutputEnv` {#sec-devShellTools-derivationOutputEnv}
|
|
|
|
Takes the relevant parts of a derivation and returns a set of environment variables, that would be present in the derivation.
|
|
|
|
:::{.example}
|
|
## `derivationOutputEnv` usage example
|
|
|
|
```nix
|
|
let
|
|
pkg = hello;
|
|
in
|
|
devShellTools.derivationOutputEnv { outputList = pkg.outputs; outputMap = pkg; }
|
|
```
|
|
|
|
:::
|