NixOS · Ericson2314 · Dec 8, 2025 · Dec 4, 2025
@@ -46,6 +46,7 @@ $defs:
       - narSize
       - references
       - ca
+      - storeDir
     properties:
       version:
         type: integer
@@ -101,6 +102,12 @@ $defs:
           If the store object is [content-addressed](@docroot@/store/store-object/content-address.md),
           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](@docroot@/glossary.md#gloss-input-addressed-store-object)), this is `null`.
+
+      storeDir:
+        type: string
+        title: Store Directory
+        description: |
+          The [store directory](@docroot@/store/store-path.md#store-directory) this store object belongs to (e.g. `/nix/store`).
     additionalProperties: false
 
   impure:
@@ -115,6 +122,7 @@ $defs:
       - narSize
       - references
       - ca
+      - storeDir
       # impure
       - deriver
       - registrationTime
@@ -127,6 +135,7 @@ $defs:
       narSize: { $ref: "#/$defs/base/properties/narSize" }
       references: { $ref: "#/$defs/base/properties/references" }
       ca: { $ref: "#/$defs/base/properties/ca" }
+      storeDir: { $ref: "#/$defs/base/properties/storeDir" }
       deriver:
         oneOf:
           - "$ref": "./store-path-v1.yaml"
@@ -192,6 +201,7 @@ $defs:
       - narSize
       - references
       - ca
+      - storeDir
       # impure
       - deriver
       - registrationTime
@@ -209,6 +219,7 @@ $defs:
       narSize: { $ref: "#/$defs/base/properties/narSize" }
       references: { $ref: "#/$defs/base/properties/references" }
       ca: { $ref: "#/$defs/base/properties/ca" }
+      storeDir: { $ref: "#/$defs/base/properties/storeDir" }
       deriver: { $ref: "#/$defs/impure/properties/deriver" }
       registrationTime: { $ref: "#/$defs/impure/properties/registrationTime" }
       ultimate: { $ref: "#/$defs/impure/properties/ultimate" }

@@ -29,6 +29,7 @@
         "references": [],
         "registrationTime": null,
         "signatures": [],
+        "storeDir": "/nix/store",
         "ultimate": false,
         "version": 2
       }

@@ -15,6 +15,7 @@
     "asdf",
     "qwer"
   ],
+  "storeDir": "/nix/store",
   "ultimate": true,
   "url": "nar/1w1fff338fvdw53sqgamddn1b2xgds473pv6y13gizdbqjv4i5p3.nar.xz",
   "version": 1

@@ -6,5 +6,6 @@
     "/nix/store/g1w7hy3qg1w7hy3qg1w7hy3qg1w7hy3q-bar",
     "/nix/store/n5wkd9frr45pa74if5gpz9j7mifg27fh-foo"
   ],
+  "storeDir": "/nix/store",
   "version": 1
 }
@@ -30,6 +30,7 @@
     "asdf",
     "qwer"
   ],
+  "storeDir": "/nix/store",
   "ultimate": true,
   "url": "nar/1w1fff338fvdw53sqgamddn1b2xgds473pv6y13gizdbqjv4i5p3.nar.xz",
   "version": 2

@@ -17,5 +17,6 @@
     "g1w7hy3qg1w7hy3qg1w7hy3qg1w7hy3q-bar",
     "n5wkd9frr45pa74if5gpz9j7mifg27fh-foo"
   ],
+  "storeDir": "/nix/store",
   "version": 2
 }
@@ -6,6 +6,7 @@
   "references": [],
   "registrationTime": null,
   "signatures": [],
+  "storeDir": "/nix/store",
   "ultimate": false,
   "version": 1
 }
@@ -3,5 +3,6 @@
   "narHash": "sha256-FePFYIlMuycIXPZbWi7LGEiMmZSX9FMbaQenWBzm1Sc=",
   "narSize": 0,
   "references": [],
+  "storeDir": "/nix/store",
   "version": 1
 }
@@ -12,6 +12,7 @@
     "asdf",
     "qwer"
   ],
+  "storeDir": "/nix/store",
   "ultimate": true,
   "version": 1
 }
@@ -6,5 +6,6 @@
     "/nix/store/g1w7hy3qg1w7hy3qg1w7hy3qg1w7hy3q-bar",
     "/nix/store/n5wkd9frr45pa74if5gpz9j7mifg27fh-foo"
   ],
+  "storeDir": "/nix/store",
   "version": 1
 }
@@ -10,6 +10,7 @@
   "references": [],
   "registrationTime": null,
   "signatures": [],
+  "storeDir": "/nix/store",
   "ultimate": false,
   "version": 2
 }
@@ -7,5 +7,6 @@
   },
   "narSize": 0,
   "references": [],
+  "storeDir": "/nix/store",
   "version": 2
 }
@@ -23,6 +23,7 @@
     "asdf",
     "qwer"
   ],
+  "storeDir": "/nix/store",
   "ultimate": true,
   "version": 2
 }
@@ -17,5 +17,6 @@
     "g1w7hy3qg1w7hy3qg1w7hy3qg1w7hy3q-bar",
     "n5wkd9frr45pa74if5gpz9j7mifg27fh-foo"
   ],
+  "storeDir": "/nix/store",
   "version": 2
 }
@@ -11,6 +11,7 @@
     "references": [],
     "registrationTime": null,
     "signatures": [],
+    "storeDir": "/nix/store",
     "ultimate": false,
     "version": 2
   },
@@ -28,6 +29,7 @@
     ],
     "registrationTime": null,
     "signatures": [],
+    "storeDir": "/nix/store",
     "ultimate": false,
     "version": 2
   }

@@ -13,6 +13,7 @@
     ],
     "registrationTime": null,
     "signatures": [],
+    "storeDir": "/nix/store",
     "ultimate": false,
     "version": 2
   },
@@ -41,6 +42,7 @@
       "fake-sig-1",
       "fake-sig-2"
     ],
+    "storeDir": "/nix/store",
     "ultimate": false,
     "version": 2
   }

@@ -11,6 +11,7 @@
     "references": [],
     "registrationTime": 23423,
     "signatures": [],
+    "storeDir": "/nix/store",
     "ultimate": false,
     "version": 2
   },
@@ -28,6 +29,7 @@
     ],
     "registrationTime": 23423,
     "signatures": [],
+    "storeDir": "/nix/store",
     "ultimate": false,
     "version": 2
   }

@@ -12,6 +12,7 @@
     "references": [],
     "registrationTime": 23423,
     "signatures": [],
+    "storeDir": "/nix/store",
     "ultimate": false,
     "version": 2
   },
@@ -31,6 +32,7 @@
     ],
     "registrationTime": 23423,
     "signatures": [],
+    "storeDir": "/nix/store",
     "ultimate": false,
     "version": 2
   }

@@ -12,6 +12,7 @@
     "references": [],
     "registrationTime": 23423,
     "signatures": [],
+    "storeDir": "/nix/store",
     "ultimate": true,
     "version": 2
   },
@@ -34,6 +35,7 @@
       "fake-sig-1",
       "fake-sig-2"
     ],
+    "storeDir": "/nix/store",
     "ultimate": false,
     "version": 2
   },
@@ -60,6 +62,7 @@
     ],
     "registrationTime": 23423,
     "signatures": [],
+    "storeDir": "/nix/store",
     "ultimate": false,
     "version": 2
   }

@@ -33,6 +33,7 @@ class PathInfoTestV2 : public CharacterizationTest, public LibStoreTest
 static UnkeyedValidPathInfo makeEmpty()
 {
     return {
+        "/nix/store",
         Hash::parseSRI("sha256-FePFYIlMuycIXPZbWi7LGEiMmZSX9FMbaQenWBzm1Sc="),
     };
 }

@@ -17,6 +17,8 @@ namespace nix {
 
 const char serveProtoDir[] = "serve-protocol";
 
+static constexpr std::string_view defaultStoreDir = "/nix/store";
+
 struct ServeProtoTest : VersionedProtoTest<ServeProto, serveProtoDir>
 {
     /**
@@ -263,12 +265,12 @@ VERSIONED_CHARACTERIZATION_TEST(
     2 << 8 | 3,
     (std::tuple<UnkeyedValidPathInfo, UnkeyedValidPathInfo>{
         ({
-            UnkeyedValidPathInfo info{Hash::dummy};
+            UnkeyedValidPathInfo info{std::string{defaultStoreDir}, Hash::dummy};
             info.narSize = 34878;
             info;
         }),
         ({
-            UnkeyedValidPathInfo info{Hash::dummy};
+            UnkeyedValidPathInfo info{std::string{defaultStoreDir}, Hash::dummy};
             info.deriver = StorePath{
                 "g1w7hy3qg1w7hy3qg1w7hy3qg1w7hy3q-bar.drv",
             };
@@ -290,6 +292,7 @@ VERSIONED_CHARACTERIZATION_TEST(
     (std::tuple<UnkeyedValidPathInfo, UnkeyedValidPathInfo>{
         ({
             UnkeyedValidPathInfo info{
+                std::string{defaultStoreDir},
                 Hash::parseSRI("sha256-FePFYIlMuycIXPZbWi7LGEiMmZSX9FMbaQenWBzm1Sc="),
             };
             info.deriver = StorePath{

@@ -17,6 +17,8 @@ namespace nix {
 
 const char workerProtoDir[] = "worker-protocol";
 
+static constexpr std::string_view defaultStoreDir = "/nix/store";
+
 struct WorkerProtoTest : VersionedProtoTest<WorkerProto, workerProtoDir>
 {
     /**
@@ -426,6 +428,7 @@ VERSIONED_CHARACTERIZATION_TEST(
     (std::tuple<UnkeyedValidPathInfo, UnkeyedValidPathInfo>{
         ({
             UnkeyedValidPathInfo info{
+                std::string{defaultStoreDir},
                 Hash::parseSRI("sha256-FePFYIlMuycIXPZbWi7LGEiMmZSX9FMbaQenWBzm1Sc="),
             };
             info.registrationTime = 23423;
@@ -434,6 +437,7 @@ VERSIONED_CHARACTERIZATION_TEST(
         }),
         ({
             UnkeyedValidPathInfo info{
+                std::string{defaultStoreDir},
                 Hash::parseSRI("sha256-FePFYIlMuycIXPZbWi7LGEiMmZSX9FMbaQenWBzm1Sc="),
             };
             info.deriver = StorePath{
@@ -462,6 +466,7 @@ VERSIONED_CHARACTERIZATION_TEST(
                     "g1w7hy3qg1w7hy3qg1w7hy3qg1w7hy3q-bar",
                 },
                 UnkeyedValidPathInfo{
+                    std::string{defaultStoreDir},
                     Hash::parseSRI("sha256-FePFYIlMuycIXPZbWi7LGEiMmZSX9FMbaQenWBzm1Sc="),
                 },
             };
@@ -475,6 +480,7 @@ VERSIONED_CHARACTERIZATION_TEST(
                     "g1w7hy3qg1w7hy3qg1w7hy3qg1w7hy3q-bar",
                 },
                 UnkeyedValidPathInfo{
+                    std::string{defaultStoreDir},
                     Hash::parseSRI("sha256-FePFYIlMuycIXPZbWi7LGEiMmZSX9FMbaQenWBzm1Sc="),
                 },
             };
@@ -509,6 +515,7 @@ VERSIONED_CHARACTERIZATION_TEST(
                     "g1w7hy3qg1w7hy3qg1w7hy3qg1w7hy3q-bar",
                 },
                 UnkeyedValidPathInfo{
+                    std::string{defaultStoreDir},
                     Hash::parseSRI("sha256-FePFYIlMuycIXPZbWi7LGEiMmZSX9FMbaQenWBzm1Sc="),
                 },
             };
@@ -523,6 +530,7 @@ VERSIONED_CHARACTERIZATION_TEST(
                     "g1w7hy3qg1w7hy3qg1w7hy3qg1w7hy3q-bar",
                 },
                 UnkeyedValidPathInfo{
+                    std::string{defaultStoreDir},
                     Hash::parseSRI("sha256-FePFYIlMuycIXPZbWi7LGEiMmZSX9FMbaQenWBzm1Sc="),
                 },
             };

@@ -905,7 +905,7 @@ static void performOp(
         auto path = WorkerProto::Serialise<StorePath>::read(*store, rconn);
         auto deriver = WorkerProto::Serialise<std::optional<StorePath>>::read(*store, rconn);
         auto narHash = Hash::parseAny(readString(conn.from), HashAlgorithm::SHA256);
-        ValidPathInfo info{path, narHash};
+        ValidPathInfo info{path, {*store, narHash}};
         info.deriver = std::move(deriver);
         info.references = WorkerProto::Serialise<StorePathSet>::read(*store, rconn);
         conn.from >> info.registrationTime >> info.narSize >> info.ultimate;

@@ -154,7 +154,7 @@ struct DummyStoreImpl : DummyStore
                 /* compute path info on demand */
                 auto narHash =
                     hashPath({accessor, CanonPath::root}, FileSerialisationMethod::NixArchive, HashAlgorithm::SHA256);
-                auto info = std::make_shared<ValidPathInfo>(path, UnkeyedValidPathInfo{narHash.hash});
+                auto info = std::make_shared<ValidPathInfo>(path, UnkeyedValidPathInfo{*this, narHash.hash});
                 info->narSize = narHash.numBytesDigested;
                 info->ca = ContentAddress{
                     .method = ContentAddressMethod::Raw::Text,

@@ -75,7 +75,7 @@ StorePaths importPaths(Store & store, Source & source, CheckSigsFlag checkSigs)
         auto deriver = readString(source);
         auto narHash = hashString(HashAlgorithm::SHA256, saved.s);
 
-        ValidPathInfo info{path, narHash};
+        ValidPathInfo info{path, {store, narHash}};
         if (deriver != "")
             info.deriver = store.parseStorePath(deriver);
         info.references = references;

@@ -49,8 +49,13 @@ struct NarInfo : ValidPathInfo, UnkeyedNarInfo
     {
     }
 
-    NarInfo(StorePath path, Hash narHash)
-        : NarInfo{ValidPathInfo{std::move(path), UnkeyedValidPathInfo(narHash)}}
+    NarInfo(const StoreDirConfig & store, StorePath path, Hash narHash)
+        : NarInfo{ValidPathInfo{std::move(path), UnkeyedValidPathInfo{store, narHash}}}
+    {
+    }
+
+    NarInfo(std::string storeDir, StorePath path, Hash narHash)
+        : NarInfo{ValidPathInfo{std::move(path), UnkeyedValidPathInfo{std::move(storeDir), narHash}}}
     {
     }