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86 lines
2.6 KiB
Markdown
86 lines
2.6 KiB
Markdown
# Derivation JSON Format
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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`:
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The output path, if it is known in advanced.
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Otherwise, `null`.
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* `method`:
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For an output which will be [content addresed], a string representing the [method](@docroot@/store/store-object/content-address.md) of content addressing that is chosen.
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Valid method strings are:
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- [`flat`](@docroot@/store/store-object/content-address.md#method-flat)
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- [`nar`](@docroot@/store/store-object/content-address.md#method-nix-archive)
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- [`text`](@docroot@/store/store-object/content-address.md#method-text)
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- [`git`](@docroot@/store/store-object/content-address.md#method-git)
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Otherwise, `null`.
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* `hashAlgo`:
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For an output which will be [content addresed], the name of the hash algorithm used.
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Valid algorithm strings are:
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- `md5`
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- `sha1`
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- `sha256`
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- `sha512`
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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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> "method": "nar",
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> "hashAlgo": "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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