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 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
fetchurlby Firefox's dependency graph:# nix derivation show -r nixpkgs#firefox \ | jq -r '.[] | select(.outputs.out.hash and .env.urls) | .env.urls' \ | uniq | sortNote that
.outputs.out.hashselects fixed-output derivations (derivations that produce output with a specified content hash), while.env.urlsselects derivations with aurlsattribute.
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:
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. -
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 addresed], a string representing the method of content addressing that is chosen. Valid method strings are:Otherwise,
null. -
hashAlgo: For an output which will be [content addresed], the name of the hash algorithm used. Valid algorithm strings are:md5sha1sha256sha512
-
hash: For fixed-output derivations, the expected content hash in base-16.
Example
"outputs": { "out": { "path": "/nix/store/2543j7c6jn75blc3drf4g5vhb1rhdq29-source", "method": "nar", "hashAlgo": "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.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
devoutput ofcurl, and theoutoutput ofunzip. -
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 thebashshell (e.g./nix/store/r3j288vpmczbl500w6zz89gyfa4nr0b1-bash-4.4-p23/bin/bash). -
args: The command-line arguments passed to thebuilder. -
env: The environment passed to thebuilder.
Options
-
--recursive/-rInclude the dependencies of the specified derivations.
-
Read installables from the standard input. No default installable applied.
Common evaluation options
-
--argname exprPass the value expr as the argument name to Nix functions.
-
--arg-from-filename pathPass the contents of file path as the argument name to Nix functions.
-
--arg-from-stdinnamePass the contents of stdin as the argument name to Nix functions.
-
--argstrname stringPass the string string as the argument name to Nix functions.
-
Start an interactive environment if evaluation fails.
-
--eval-storestore-urlThe URL of the Nix store to use for evaluation, i.e. to store derivations (
.drvfiles) and inputs referenced by them. -
Allow access to mutable paths and repositories.
-
--include/-IpathAdd path to the Nix search path. The Nix search path is initialized from the colon-separated
NIX_PATHenvironment variable, and is used to look up the location of Nix expressions using paths enclosed in angle brackets (i.e.,<nixpkgs>).For instance, passing
-I /home/eelco/Dev -I /etc/nixoswill cause Nix to look for paths relative to
/home/eelco/Devand/etc/nixos, in that order. This is equivalent to setting theNIX_PATHenvironment variable to/home/eelco/Dev:/etc/nixosIt is also possible to match paths against a prefix. For example, passing
-I nixpkgs=/home/eelco/Dev/nixpkgs-branch -I /etc/nixoswill cause Nix to search for
<nixpkgs/path>in/home/eelco/Dev/nixpkgs-branch/pathand/etc/nixos/nixpkgs/path.If a path in the Nix search path starts with
http://orhttps://, it is interpreted as the URL of a tarball that will be downloaded and unpacked to a temporary location. The tarball must consist of a single top-level directory. For example, passing-I nixpkgs=https://github.com/NixOS/nixpkgs/archive/master.tar.gztells Nix to download and use the current contents of the
masterbranch in thenixpkgsrepository.The URLs of the tarballs from the official
nixos.orgchannels (see the manual page fornix-channel) can be abbreviated aschannel:<channel-name>. For instance, the following two flags are equivalent:-I nixpkgs=channel:nixos-21.05 -I nixpkgs=https://nixos.org/channels/nixos-21.05/nixexprs.tar.xzYou can also fetch source trees using flake URLs and add them to the search path. For instance,
-I nixpkgs=flake:nixpkgsspecifies that the prefix
nixpkgsshall refer to the source tree downloaded from thenixpkgsentry in the flake registry. Similarly,-I nixpkgs=flake:github:NixOS/nixpkgs/nixos-22.05makes
<nixpkgs>refer to a particular branch of theNixOS/nixpkgsrepository on GitHub. -
--override-flakeoriginal-ref resolved-refOverride the flake registries, redirecting original-ref to resolved-ref.
Common flake-related options
-
Commit changes to the flake's lock file.
-
--inputs-fromflake-urlUse the inputs of the specified flake as registry entries.
-
Don't allow lookups in the flake registries.
DEPRECATED
Use
--no-use-registriesinstead. -
Do not allow any updates to the flake's lock file.
-
Do not write the flake's newly generated lock file.
-
--output-lock-fileflake-lock-pathWrite the given lock file instead of
flake.lockwithin the top-level flake. -
--override-inputinput-path flake-urlOverride a specific flake input (e.g.
dwarffs/nixpkgs). This implies--no-write-lock-file. -
Recreate the flake's lock file from scratch.
DEPRECATED
Use
nix flake updateinstead. -
--reference-lock-fileflake-lock-pathRead the given lock file instead of
flake.lockwithin the top-level flake. -
--update-inputinput-pathUpdate a specific flake input (ignoring its previous entry in the lock file).
DEPRECATED
Use
nix flake updateinstead.
Logging-related options
-
Set the logging verbosity level to 'debug'.
-
--log-formatformatSet the format of log output; one of
raw,internal-json,barorbar-with-logs. -
--print-build-logs/-LPrint full build logs on standard error.
-
Decrease the logging verbosity level.
-
--verbose/-vIncrease the logging verbosity level.
Miscellaneous global options
-
Show usage information.
-
Disable substituters and consider all previously downloaded files up-to-date.
-
--optionname valueSet the Nix configuration setting name to value (overriding
nix.conf). -
Consider all previously downloaded files out-of-date.
-
During evaluation, rewrite missing or corrupted files in the Nix store. During building, rebuild missing or corrupted store paths.
-
Show version information.
Options that change the interpretation of installables
-
--exprexprInterpret installables as attribute paths relative to the Nix expression expr.
-
--file/-ffileInterpret 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.conffor overriding configuration settings with command line flags.