Create JSON Schema for Store Paths

We immediately use this in the JSON schemas for Derivation and Deriving
Path, but we cannot yet use it in Store Object Info because those paths
*do* include the store dir currently.

doc/manual/source/SUMMARY.md.in

@@ -119,6 +119,7 @@
   - [JSON Formats](protocols/json/index.md)
     - [Hash](protocols/json/hash.md)
     - [Content Address](protocols/json/content-address.md)
+    - [Store Path](protocols/json/store-path.md)
     - [Store Object Info](protocols/json/store-object-info.md)
     - [Derivation](protocols/json/derivation.md)
     - [Deriving Path](protocols/json/deriving-path.md)

doc/manual/source/protocols/json/meson.build

@@ -11,6 +11,7 @@ json_schema_config = files('json-schema-for-humans-config.yaml')
 schemas = [
   'hash-v1',
   'content-address-v1',
+  'store-path-v1',
   'derivation-v3',
   'deriving-path-v1',
 ]

doc/manual/source/protocols/json/schema/derivation-v3.yaml

@@ -85,7 +85,7 @@ properties:
       > ]
       > ```
     items:
-      type: string
+      $ref: "store-path-v1.yaml"
 
   inputDrvs:
     type: object
@@ -103,13 +103,15 @@ properties:
       > ```
       >
       > specifies that this derivation depends on the `dev` output of `curl`, and the `out` output of `unzip`.
-    additionalProperties:
-      title: Store Path
-      description: |
-        A store path to a derivation, mapped to the outputs of that derivation.
-      oneOf:
-      - "$ref": "#/$defs/outputNames"
-      - "$ref": "#/$defs/dynamicOutputs"
+    patternProperties:
+      "^[0123456789abcdfghijklmnpqrsvwxyz]{32}-.+\\.drv$":
+        title: Store Path
+        description: |
+          A store path to a derivation, mapped to the outputs of that derivation.
+        oneOf:
+        - "$ref": "#/$defs/outputNames"
+        - "$ref": "#/$defs/dynamicOutputs"
+    additionalProperties: false
 
   system:
     type: string
@@ -155,7 +157,7 @@ properties:
     type: object
     properties:
       path:
-        type: string
+        $ref: "store-path-v1.yaml"
         title: Output path
         description: |
           The output path, if known in advance.

doc/manual/source/protocols/json/schema/deriving-path-v1.yaml

@@ -7,7 +7,7 @@ oneOf:
   - title: Constant
     description: |
       See [Constant](@docroot@/store/derivation/index.md#deriving-path-constant) deriving path.
-    type: string
+    $ref: "store-path-v1.yaml"
   - title: Output
     description: |
       See [Output](@docroot@/store/derivation/index.md#deriving-path-output) deriving path.

doc/manual/source/protocols/json/schema/store-path-v1

@@ -0,0 +1 @@
+../../../../../../src/libstore-tests/data/store-path

doc/manual/source/protocols/json/schema/store-path-v1.yaml

@@ -0,0 +1,32 @@
+"$schema": "http://json-schema.org/draft-07/schema"
+"$id": "https://nix.dev/manual/nix/latest/protocols/json/schema/store-path-v1.json"
+title: Store Path
+description: |
+  A [store path](@docroot@/store/store-path.md) identifying a store object.
+
+  This schema describes the JSON representation of store paths as used in various Nix JSON APIs.
+
+  > **Warning**
+  >
+  > This JSON format is currently
+  > [**experimental**](@docroot@/development/experimental-features.md#xp-feature-nix-command)
+  > and subject to change.
+
+  ## Format
+
+  Store paths in JSON are represented as strings containing just the hash and name portion, without the store directory prefix.
+
+  For example: `"g1w7hy3qg1w7hy3qg1w7hy3qg1w7hy3q-foo.drv"`
+
+  (If the store dir is `/nix/store`, then this corresponds to the path `/nix/store/g1w7hy3qg1w7hy3qg1w7hy3qg1w7hy3q-foo.drv`.)
+
+  ## Structure
+
+  The format follows this pattern: `${digest}-${name}`
+
+  - **hash**: Digest rendered in a custom variant of [Base32](https://en.wikipedia.org/wiki/Base32) (20 arbitrary bytes become 32 ASCII characters)
+  - **name**: The package name and optional version/suffix information
+
+type: string
+pattern: "^[0123456789abcdfghijklmnpqrsvwxyz]{32}-.+$"
+minLength: 34

doc/manual/source/protocols/json/store-path.md

@@ -0,0 +1,15 @@
+{{#include store-path-v1-fixed.md}}
+
+## Examples
+
+### Simple store path
+
+```json
+{{#include schema/store-path-v1/simple.json}}
+```
+
+<!--
+## Raw Schema
+
+[JSON Schema for Store Path v1](schema/store-path-v1.json)
+-->