Rename doc/manual{src -> source}

This is needed to avoid this
https://github.com/mesonbuild/meson/issues/13774 when we go back to
making our subproject directory `src`.

doc/manual/source/protocols/json/derivation.md

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+# Derivation JSON Format
+
+> **Warning**
+>
+> This JSON format is currently
+> [**experimental**](@docroot@/development/experimental-features.md#xp-feature-nix-command)
+> and subject to change.
+
+The JSON serialization of a
+[derivations](@docroot@/glossary.md#gloss-store-derivation)
+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](@docroot@/store/store-object/content-address.md) of content addressing that is chosen.
+    Valid method strings are:
+
+    - [`flat`](@docroot@/store/store-object/content-address.md#method-flat)
+    - [`nar`](@docroot@/store/store-object/content-address.md#method-nix-archive)
+    - [`text`](@docroot@/store/store-object/content-address.md#method-text)
+    - [`git`](@docroot@/store/store-object/content-address.md#method-git)
+
+    Otherwise, `null`.
+
+  * `hashAlgo`:
+    For an output which will be [content addresed], the name of the hash algorithm used.
+    Valid algorithm strings are:
+
+    - `md5`
+    - `sha1`
+    - `sha256`
+    - `sha512`
+
+  * `hash`:
+    For fixed-output derivations, the expected content hash in base-16.
+
+  > **Example**
+  >
+  > ```json
+  > "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**
+  >
+  > ```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`.

doc/manual/source/protocols/json/index.md

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+# JSON Formats

doc/manual/source/protocols/json/store-object-info.md

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+# Store object info JSON format
+
+> **Warning**
+>
+> This JSON format is currently
+> [**experimental**](@docroot@/development/experimental-features.md#xp-feature-nix-command)
+> and subject to change.
+
+Info about a [store object].
+
+* `path`:
+
+  [Store path][store path] to the given store object.
+
+* `narHash`:
+
+  Hash of the [file system object] part of the store object when serialized as a [Nix Archive].
+
+* `narSize`:
+
+  Size of the [file system object] part of the store object when serialized as a [Nix Archive].
+
+* `references`:
+
+  An array of [store paths][store path], possibly including this one.
+
+* `ca`:
+
+  If the store object is [content-addressed],
+  this is the content address of this store object's file system object, used to compute its store path.
+  Otherwise (i.e. if it is [input-addressed]), this is `null`.
+
+[store path]: @docroot@/store/store-path.md
+[file system object]: @docroot@/store/file-system-object.md
+[Nix Archive]: @docroot@/store/file-system-object/content-address.md#serial-nix-archive
+
+## Impure fields
+
+These are not intrinsic properties of the store object.
+In other words, the same store object residing in different store could have different values for these properties.
+
+* `deriver`:
+
+  If known, the path to the [derivation] from which this store object was produced.
+  Otherwise `null`.
+
+  [derivation]: @docroot@/glossary.md#gloss-store-derivation
+
+* `registrationTime` (optional):
+
+  If known, when this derivation was added to the store.
+  Otherwise `null`.
+
+* `ultimate`:
+
+  Whether this store object is trusted because we built it ourselves, rather than substituted a build product from elsewhere.
+
+* `signatures`:
+
+  Signatures claiming that this store object is what it claims to be.
+  Not relevant for [content-addressed] store objects,
+  but useful for [input-addressed] store objects.
+
+[content-addressed]: @docroot@/store/store-object/content-address.md
+[input-addressed]: @docroot@/glossary.md#gloss-input-addressed-store-object
+
+### `.narinfo` extra fields
+
+This meta data is specific to the "binary cache" family of Nix store types.
+This information is not intrinsic to the store object, but about how it is stored.
+
+* `url`:
+
+  Where to download a compressed archive of the file system objects of this store object.
+
+* `compression`:
+
+  The compression format that the archive is in.
+
+* `fileHash`:
+
+  A digest for the compressed archive itself, as opposed to the data contained within.
+
+* `fileSize`:
+
+  The size of the compressed archive itself.
+
+## Computed closure fields
+
+These fields are not stored at all, but computed by traversing the other fields across all the store objects in a [closure].
+
+* `closureSize`:
+
+  The total size of the compressed archive itself for this object, and the compressed archive of every object in this object's [closure].
+
+### `.narinfo` extra fields
+
+* `closureSize`:
+
+  The total size of this store object and every other object in its [closure].
+
+[closure]: @docroot@/glossary.md#gloss-closure