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R""(
**Note:** this command's interface is based heavily around [*installables*](./nix.md#installables), which you may want to read about first (`nix --help`).
# Examples
* Show the [store derivation] that results from evaluating the Hello
package:
[store derivation]: ../../glossary.md#gloss-store-derivation
```console
# nix derivation show nixpkgs#hello
{
"/nix/store/s6rn4jz1sin56rf4qj5b5v8jxjm32hlk-hello-2.10.drv": {
…
}
}
```
* Show the full derivation graph (if available) that produced your
NixOS system:
```console
# nix derivation show -r /run/current-system
```
* Print all files fetched using `fetchurl` by Firefox's dependency
graph:
```console
# 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 derivation]s to which [*installables*](./nix.md#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:
* `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.
* `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.
Example:
```json
"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,
```json
"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`.
)""
|
