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This is needed to avoid this https://github.com/mesonbuild/meson/issues/13774 when we go back to making our subproject directory `src`.
102 lines
2.9 KiB
Markdown
102 lines
2.9 KiB
Markdown
# 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@/development/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].
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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].
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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`:
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If the store object is [content-addressed],
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this is the content address of this store object's file system object, used to compute its store path.
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Otherwise (i.e. if it is [input-addressed]), this is `null`.
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[store path]: @docroot@/store/store-path.md
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[file system object]: @docroot@/store/file-system-object.md
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[Nix Archive]: @docroot@/store/file-system-object/content-address.md#serial-nix-archive
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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`:
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If known, the path to the [derivation] from which this store object was produced.
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Otherwise `null`.
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[derivation]: @docroot@/glossary.md#gloss-store-derivation
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* `registrationTime` (optional):
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If known, when this derivation was added to the store.
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Otherwise `null`.
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* `ultimate`:
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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`:
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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@/store/store-object/content-address.md
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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 traversing the 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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