Name

       nix derivation show - show the contents of a store derivation

Synopsis

       nix derivation show [option…] installables…

Examples

       •  Show the store derivation that results from evaluating the Hello package:

       # nix derivation show nixpkgs#hello
       {
       "/nix/store/s6rn4jz1sin56rf4qj5b5v8jxjm32hlk-hello-2.10.drv": {
         …
       }
       }

       •  Show the full derivation graph (if available) that produced your NixOS system:

       # nix derivation show -r /run/current-system

       •  Print all files fetched using fetchurl by Firefox’s dependency graph:

       # nix derivation show -r nixpkgs#firefox \
       | jq -r '.[] | select(.outputs.out.hash and .env.urls) | .env.urls' \
       | uniq | sort

              Note that .outputs.out.hash selects fixed-output derivations (derivations that produce output with
              a specified content hash), while .env.urls selects derivations with a urls attribute.

Description

       This  command  prints  on  standard  output  a  JSON  representation  of  the  store derivations to which
       installables evaluate.

       Store derivations are used internally by Nix. They are store paths with extension .drv that represent the
       build-time dependency graph to which a Nix expression evaluates.

       By default, this command only shows top-level derivations, but with  --recursive,  it  also  shows  their
       dependencies.

       nix derivation show outputs a JSON map of store paths to derivations in the following format:

       {{#include ../../protocols/json/derivation.md}}

Options

       •  --recursive / -r

          Include the dependencies of the specified derivations.

       •  --stdin

          Read installables from the standard input. No default installable applied.

   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-derivation-show(1)