Warning: This program is experimental and its interface is subject to change.
Name
nix print-dev-env
- print shell code that can be sourced by bash to reproduce the build environment of a derivation
Synopsis
nix print-dev-env
[option...] installable
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.
Options
-
--json
Produce output in JSON format, suitable for consumption by another program. -
--profile
path
The profile to update. -
--redirect
installable outputs-dir
Redirect a store path to a mutable location.
Common evaluation options:
-
--arg
name expr
Pass the value expr as the argument name to Nix functions. -
--argstr
name string
Pass the string string as the argument name to Nix functions. -
--eval-store
store-url
The Nix store to use for evaluations. -
--impure
Allow access to mutable paths and repositories. -
--include
/-I
path
Add path to the list of locations used to look up<...>
file names. -
--override-flake
original-ref resolved-ref
Override the flake registries, redirecting original-ref to resolved-ref.
Common flake-related options:
-
--commit-lock-file
Commit changes to the flake's lock file. -
--inputs-from
flake-url
Use the inputs of the specified flake as registry entries. -
--no-registries
Don't allow lookups in the flake registries. This option is deprecated; use--no-use-registries
. -
--no-update-lock-file
Do not allow any updates to the flake's lock file. -
--no-write-lock-file
Do not write the flake's newly generated lock file. -
--override-input
input-path flake-url
Override a specific flake input (e.g.dwarffs/nixpkgs
). This implies--no-write-lock-file
. -
--recreate-lock-file
Recreate the flake's lock file from scratch. -
--update-input
input-path
Update a specific flake input (ignoring its previous entry in the lock file).
Options that change the interpretation of installables:
-
--derivation
Operate on the store derivation rather than its outputs. -
--expr
expr
Interpret installables as attribute paths relative to the Nix expression expr. -
--file
/-f
file
Interpret installables as attribute paths relative to the Nix expression stored in file. If file is the character -, then a Nix expression will be read from standard input.