Document JSON formats
Good to document these formats separately from commands that happen to use them. Eventually I would like this and `builtins.derivation` to refer to a store section on derivations that is authoritative, but that doesn't yet exist, and will take some time to make. So I think we're just best off merging this now as is. Co-authored-by: Valentin Gagarin <valentin.gagarin@tweag.io>
This commit is contained in:
John Ericson
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382fa51ff0
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@ -104,6 +104,9 @@
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- [Channels](command-ref/files/channels.md)
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- [Default Nix expression](command-ref/files/default-nix-expression.md)
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- [Architecture and Design](architecture/architecture.md)
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- [JSON Formats](json/index.md)
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- [Store Object Info](json/store-object-info.md)
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- [Derivation](json/derivation.md)
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- [Protocols](protocols/index.md)
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- [Serving Tarball Flakes](protocols/tarball-fetcher.md)
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- [Derivation "ATerm" file format](protocols/derivation-aterm.md)
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@ -127,7 +127,7 @@
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non-[fixed-output](#gloss-fixed-output-derivation)
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derivation.
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- [output-addressed store object]{#gloss-output-addressed-store-object}
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- [content-addressed store object]{#gloss-content-addressed-store-object}
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A [store object] whose [store path] is determined by its contents.
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This includes derivations, the outputs of [content-addressed derivations](#gloss-content-addressed-derivation), and the outputs of [fixed-output derivations](#gloss-fixed-output-derivation).
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@ -0,0 +1,71 @@
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# Derivation JSON Format
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> **Warning**
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>
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> This JSON format is currently
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> [**experimental**](@docroot@/contributing/experimental-features.md#xp-feature-nix-command)
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> and subject to change.
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The JSON serialization of a
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[derivations](@docroot@/glossary.md#gloss-store-derivation)
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is a JSON object with the following fields:
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* `name`:
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The name of the derivation.
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This is used when calculating the store paths of the derivation's outputs.
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* `outputs`:
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Information about the output paths of the derivation.
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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:
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* `path`: The output path.
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* `hashAlgo`:
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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.
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* `hash`:
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For fixed-output derivations, the expected content hash in base-16.
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> **Example**
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>
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> ```json
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> "outputs": {
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> "out": {
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> "path": "/nix/store/2543j7c6jn75blc3drf4g5vhb1rhdq29-source",
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> "hashAlgo": "r:sha256",
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> "hash": "6fc80dcc62179dbc12fc0b5881275898f93444833d21b89dfe5f7fbcbb1d0d62"
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> }
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> }
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> ```
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* `inputSrcs`:
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A list of store paths on which this derivation depends.
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* `inputDrvs`:
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A JSON object specifying the derivations on which this derivation depends, and what outputs of those derivations.
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> **Example**
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>
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> ```json
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> "inputDrvs": {
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> "/nix/store/6lkh5yi7nlb7l6dr8fljlli5zfd9hq58-curl-7.73.0.drv": ["dev"],
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> "/nix/store/fn3kgnfzl5dzym26j8g907gq3kbm8bfh-unzip-6.0.drv": ["out"]
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> }
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> ```
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specifies that this derivation depends on the `dev` output of `curl`, and the `out` output of `unzip`.
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* `system`:
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The system type on which this derivation is to be built
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(e.g. `x86_64-linux`).
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* `builder`:
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The absolute path of the program to be executed to run the build.
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Typically this is the `bash` shell
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(e.g. `/nix/store/r3j288vpmczbl500w6zz89gyfa4nr0b1-bash-4.4-p23/bin/bash`).
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* `args`:
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The command-line arguments passed to the `builder`.
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* `env`:
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The environment passed to the `builder`.
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@ -0,0 +1,97 @@
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# Store object info JSON format
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> **Warning**
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>
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> This JSON format is currently
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> [**experimental**](@docroot@/contributing/experimental-features.md#xp-feature-nix-command)
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> and subject to change.
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Info about a [store object].
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* `path`:
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[Store path][store path] to the given store object.
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* `narHash`:
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Hash of the [file system object] part of the store object when serialized as a [Nix Archive](#gloss-nar).
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* `narSize`:
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Size of the [file system object] part of the store object when serialized as a [Nix Archive](#gloss-nar).
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* `references`:
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An array of [store paths][store path], possibly including this one.
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* `ca` (optional):
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Content address of this store object's file system object, used to compute its store path.
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[store path]: @docroot@/glossary.md#gloss-store-path
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[file system object]: @docroot@/store/file-system-object.md
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## Impure fields
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These are not intrinsic properties of the store object.
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In other words, the same store object residing in different store could have different values for these properties.
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* `deriver` (optional):
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The path to the [derivation] from which this store object is produced.
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[derivation]: @docroot@/glossary.md#gloss-store-derivation
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* `registrationTime` (optional):
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When this derivation was added to the store.
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* `ultimate` (optional):
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Whether this store object is trusted because we built it ourselves, rather than substituted a build product from elsewhere.
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* `signatures` (optional):
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Signatures claiming that this store object is what it claims to be.
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Not relevant for [content-addressed] store objects,
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but useful for [input-addressed] store objects.
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[content-addressed]: @docroot@/glossary.md#gloss-content-addressed-store-object
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[input-addressed]: @docroot@/glossary.md#gloss-input-addressed-store-object
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### `.narinfo` extra fields
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This meta data is specific to the "binary cache" family of Nix store types.
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This information is not intrinsic to the store object, but about how it is stored.
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* `url`:
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Where to download a compressed archive of the file system objects of this store object.
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* `compression`:
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The compression format that the archive is in.
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* `fileHash`:
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A digest for the compressed archive itself, as opposed to the data contained within.
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* `fileSize`:
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The size of the compressed archive itself.
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## Computed closure fields
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These fields are not stored at all, but computed by traverising the other other fields across all the store objects in a [closure].
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* `closureSize`:
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The total size of the compressed archive itself for this object, and the compressed archive of every object in this object's [closure].
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### `.narinfo` extra fields
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* `closureSize`:
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The total size of this store object and every other object in its [closure].
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[closure]: @docroot@/glossary.md#gloss-closure
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@ -635,7 +635,7 @@ public:
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- the store object has been signed using a key in the trusted keys list
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- the [`require-sigs`](#conf-require-sigs) option has been set to `false`
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- the store object is [output-addressed](@docroot@/glossary.md#gloss-output-addressed-store-object)
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- the store object is [content-addressed](@docroot@/glossary.md#gloss-content-addressed-store-object)
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)",
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{"binary-cache-public-keys"}};
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@ -9,10 +9,11 @@ Store derivations are used internally by Nix. They are store paths with
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extension `.drv` that represent the build-time dependency graph to which
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a Nix expression evaluates.
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[store derivation]: ../../glossary.md#gloss-store-derivation
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The JSON format is documented under the [`derivation show`] command.
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[store derivation]: @docroot@/glossary.md#gloss-store-derivation
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[`derivation show`]: ./nix3-derivation-show.md
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`nix derivation add` takes a single derivation in the following format:
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{{#include ../../json/derivation.md}}
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)""
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@ -5,8 +5,6 @@ R""(
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* Show the [store derivation] that results from evaluating the Hello
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package:
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[store derivation]: ../../glossary.md#gloss-store-derivation
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```console
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# nix derivation show nixpkgs#hello
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{
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@ -48,62 +46,12 @@ a Nix expression evaluates.
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By default, this command only shows top-level derivations, but with
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`--recursive`, it also shows their dependencies.
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The JSON output is a JSON object whose keys are the store paths of the
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derivations, and whose values are a JSON object with the following
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fields:
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[store derivation]: @docroot@/glossary.md#gloss-store-derivation
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* `name`: The name of the derivation. This is used when calculating the
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store paths of the derivation's outputs.
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`nix derivation show` outputs a JSON map of [store path]s to derivations in the following format:
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* `outputs`: Information about the output paths of the
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derivation. This is a JSON object with one member per output, where
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the key is the output name and the value is a JSON object with these
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fields:
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[store path]: @docroot@/glossary.md#gloss-store-path
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* `path`: The output path.
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* `hashAlgo`: For fixed-output derivations, the hashing algorithm
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(e.g. `sha256`), optionally prefixed by `r:` if `hash` denotes a
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NAR hash rather than a flat file hash.
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* `hash`: For fixed-output derivations, the expected content hash in
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base-16.
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Example:
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```json
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"outputs": {
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"out": {
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"path": "/nix/store/2543j7c6jn75blc3drf4g5vhb1rhdq29-source",
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"hashAlgo": "r:sha256",
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"hash": "6fc80dcc62179dbc12fc0b5881275898f93444833d21b89dfe5f7fbcbb1d0d62"
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}
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}
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```
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* `inputSrcs`: A list of store paths on which this derivation depends.
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* `inputDrvs`: A JSON object specifying the derivations on which this
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derivation depends, and what outputs of those derivations. For
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example,
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```json
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"inputDrvs": {
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"/nix/store/6lkh5yi7nlb7l6dr8fljlli5zfd9hq58-curl-7.73.0.drv": ["dev"],
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"/nix/store/fn3kgnfzl5dzym26j8g907gq3kbm8bfh-unzip-6.0.drv": ["out"]
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}
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```
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specifies that this derivation depends on the `dev` output of
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`curl`, and the `out` output of `unzip`.
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* `system`: The system type on which this derivation is to be built
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(e.g. `x86_64-linux`).
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* `builder`: The absolute path of the program to be executed to run
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the build. Typically this is the `bash` shell
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(e.g. `/nix/store/r3j288vpmczbl500w6zz89gyfa4nr0b1-bash-4.4-p23/bin/bash`).
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* `args`: The command-line arguments passed to the `builder`.
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* `env`: The environment passed to the `builder`.
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{{#include ../../json/derivation.md}}
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)""
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