Nix/src/nix/print-dev-env.md

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Examples

• Apply the build environment of GNU hello to the current shell:

  # . <(nix print-dev-env nixpkgs#hello)
  

• Get the build environment in JSON format:

  # nix print-dev-env nixpkgs#hello --json
  

  The output will look like this:

  {
    "bashFunctions": {
      "buildPhase": " \n    runHook preBuild;\n...",
      ...
    },
    "variables": {
      "src": {
        "type": "exported",
        "value": "/nix/store/3x7dwzq014bblazs7kq20p9hyzz0qh8g-hello-2.10.tar.gz"
      },
      "postUnpackHooks": {
        "type": "array",
        "value": ["_updateSourceDateEpochFromSourceRoot"]
      },
      ...
    }
  }
  

Description

This command prints a shell script that can be sourced by bash and that sets the variables and shell functions defined by the build process of installable. This allows you to get a similar build environment in your current shell rather than in a subshell (as with nix develop).

With --json, the output is a JSON serialisation of the variables and functions defined by the build process.

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