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 operate on.

       •  --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.

       •  --arg-from-file name path

          Pass the contents of file path as the argument name to Nix functions.

       •  --arg-from-stdin name

          Pass the contents of stdin as the argument name to Nix functions.

       •  --argstr name string

          Pass the string string as the argument name to Nix functions.

       •  --debugger

          Start an interactive environment if evaluation fails.

       •  --eval-store store-url

          The URL of the Nix store to use for evaluation, i.e. to store  derivations  (.drv  files)  and  inputs
          referenced by them.

       •  --impure

          Allow access to mutable paths and repositories.

       •  --include / -I path

          Add path to search path entries used to resolve lookup paths

          This option may be given multiple times.

          Paths  added  through  -I  take  precedence  over  the nix-path configuration setting and the NIX_PATH
          environment variable.

       •  --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.

                 DEPRECATED

                 Use --no-use-registries instead.

       •  --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.

       •  --output-lock-file flake-lock-path

          Write the given lock file instead of flake.lock within the top-level flake.

       •  --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.

                 DEPRECATED

                 Use nix flake update instead.

       •  --reference-lock-file flake-lock-path

          Read the given lock file instead of flake.lock within the top-level flake.

       •  --update-input input-path

          Update a specific flake input (ignoring its previous entry in the lock file).

                 DEPRECATED

                 Use nix flake update instead.

   Logging-related options
       •  --debug

          Set the logging verbosity level to ‘debug’.

       •  --log-format format

          Set the format of log output; one of raw, internal-json, bar or bar-with-logs.

       •  --print-build-logs / -L

          Print full build logs on standard error.

       •  --quiet

          Decrease the logging verbosity level.

       •  --verbose / -v

          Increase the logging verbosity level.

   Miscellaneous global options
       •  --help

          Show usage information.

       •  --offline

          Disable substituters and consider all previously downloaded files up-to-date.

       •  --option name value

          Set the Nix configuration setting name to value (overriding nix.conf).

       •  --refresh

          Consider all previously downloaded files out-of-date.

       •  --repair

          During evaluation, rewrite missing or corrupted files in  the  Nix  store.  During  building,  rebuild
          missing or corrupted store paths.

       •  --version

          Show version information.

   Options that change the interpretation of installables
       •  --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. Implies --impure.

          Note

          See man nix.conf for overriding configuration settings with command line flags.

                                                                                           nix3-print-dev-env(1)