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nix3-derivation-show(1) General Commands Manual nix3-derivation-show(1) Warning This program is experimental and its interface is subject to change. 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 pack- age: # nix derivation show nixpkgs#hello { "/nix/store/s6rn4jz1sin56rf4qj5b5v8jxjm32hlk-hello-2.10.drv": { a| } } * 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 (de- rivations 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 ex- tension .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 --re- cursive, it also shows their dependencies. nix derivation show outputs a JSON map of store paths to derivations in the following format: Derivation JSON Format Warning This JSON format is currently experimental and subject to change. The JSON serialization of a derivations is a JSON object with the following fields: * name: The name of the derivation. This is used when calculating the store paths of the derivation's outputs. * version: Must be 3. This is a guard that allows us to continue evolving this format. The choice of 3 is fairly arbitrary, but corresponds to this informal version: * Version 0: A-Term format * Version 1: Original JSON format, with ugly "r:sha256" inherited from A-Term format. * Version 2: Separate method and hashAlgo fields in output specs * Verison 3: Drop store dir from store paths, just include base name. Note that while this format is experimental, the maintenance of versions is best-effort, and not promised to identify every change. * 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, if it is known in advanced. Otherwise, null. * method: For an output which will be [content addressed], a string representing the method of content addressing that is chosen. Valid method strings are: * flat * nar * text * git Otherwise, null. * hashAlgo: For an output which will be [content addressed], the name of the hash algorithm used. Valid algorithm strings are: * blake3 * md5 * sha1 * sha256 * sha512 * hash: For fixed-output derivations, the expected content hash in base-16. Example "outputs": { "out": { "method": "nar", "hashAlgo": "sha256", "hash": "6fc80dcc62179dbc12fc0b5881275898f93444833d21b89dfe5f7fbcbb1d0d62" } } * inputSrcs: A list of store paths on which this derivation depends. Example "inputSrcs": [ "47y241wqdhac3jm5l7nv0x4975mb1975-separate-debug-info.sh", "56d0w71pjj9bdr363ym3wj1zkwyqq97j-fix-pop-var-context-error.patch" ] * inputDrvs: A JSON object specifying the derivations on which this de- rivation depends, and what outputs of those derivations. Example "inputDrvs": { "6lkh5yi7nlb7l6dr8fljlli5zfd9hq58-curl-7.73.0.drv": ["dev"], "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/r3j288vpm- czbl500w6zz89gyfa4nr0b1-bash-4.4-p23/bin/bash). * args: The command-line arguments passed to the builder. * env: The environment passed to the builder. * structuredAttrs: Strucutured Attributes, only defined if the derivation contains them. Structured attributes are JSON, and thus embedded as-is. Options * --no-pretty Print compact JSON output on a single line, even when the output is a terminal. Some commands may print multiple JSON objects on separate lines. See `--pretty`. * --pretty Print multi-line, indented JSON output for readability. Default: indent if output is to a terminal. This option is only effective when `--json` is also specified. * --recursive / -r Include the dependencies of the specified derivations. * --stdin Read installables from the standard input. No default installable ap- plied. 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 deriva- tions (.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 is read from standard input. Implies --impure. Note See man nix.conf for overriding configuration settings with command line flags. nix3-derivation-show(1)
Name | Synopsis | Examples | Description | Derivation JSON Format | Options
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