nix3-show-derivation(1) General Commands Manual nix3-show-derivation(1)

Warning: This program is experimental and its interface is subject to change.

nix show-derivation - show the contents of a store derivation

nix show-derivation [option…] installables

Show the store derivation that results from evaluating the Hello package:
# nix show-derivation nixpkgs#hello
"/nix/store/s6rn4jz1sin56rf4qj5b5v8jxjm32hlk-hello-2.10.drv": {

… } }
Show the full derivation graph (if available) that produced your NixOS system:
# nix show-derivation -r /run/current-system
Print all files fetched using fetchurl by Firefox’s dependency graph:
# nix show-derivation -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.

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.

The JSON output is a JSON object whose keys are the store paths of the derivations, and whose values are a JSON object with the following fields:

outputs: Information about the output paths of the derivation. This is a JSON object with one member per output, where the key is the output name and the value is a JSON object with these fields:
  • path: The output path.
  • hashAlgo: For fixed-output derivations, the hashing algorithm (e.g. sha256), optionally prefixed by r: if hash denotes a NAR hash rather than a flat file hash.
  • hash: For fixed-output derivations, the expected content hash in base-16.
"outputs": {
"out": {

"path": "/nix/store/2543j7c6jn75blc3drf4g5vhb1rhdq29-source",
"hashAlgo": "r:sha256",
"hash": "6fc80dcc62179dbc12fc0b5881275898f93444833d21b89dfe5f7fbcbb1d0d62" } }
  • inputSrcs: A list of store paths on which this derivation depends.
  • inputDrvs: A JSON object specifying the derivations on which this derivation depends, and what outputs of those derivations. For example,
"inputDrvs": {
"/nix/store/6lkh5yi7nlb7l6dr8fljlli5zfd9hq58-curl-7.73.0.drv": ["dev"],
"/nix/store/fn3kgnfzl5dzym26j8g907gq3kbm8bfh-unzip-6.0.drv": ["out"]
specifies that this derivation depends on the dev output of curl, and the out output of unzip.
  • system: The system type on which this derivation is to be built (e.g. x86_64-linux).
  • builder: The absolute path of the program to be executed to run the build. Typically this is the bash shell (e.g. /nix/store/r3j288vpmczbl500w6zz89gyfa4nr0b1-bash-4.4-p23/bin/bash).
  • args: The command-line arguments passed to the builder.
  • env: The environment passed to the builder.

--recursive / -r
Include the dependencies of the specified derivations.

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.