libstore: remove static initializers for Store registrations

Ref #359.

Change-Id: Ia45530ddee25fa9fc399ff10738bb0d8bbc8b221

src/libstore/dummy-store.cc

@@ -1,3 +1,4 @@
+#include "dummy-store.hh"
 #include "store-api.hh"
 
 namespace nix {
@@ -73,6 +74,8 @@ struct DummyStore : public virtual DummyStoreConfig, public virtual Store
     { unsupported("getFSAccessor"); }
 };
 
-static RegisterStoreImplementation<DummyStore, DummyStoreConfig> regDummyStore;
+void registerDummyStore() {
+    StoreImplementations::add<DummyStore, DummyStoreConfig>();
+}
 
 }

src/libstore/dummy-store.hh

@@ -0,0 +1,8 @@
+#pragma once
+///@file
+
+namespace nix {
+
+void registerDummyStore();
+
+}

src/libstore/globals.cc

@@ -33,6 +33,16 @@
 #include <sys/sysctl.h>
 #endif
 
+// All built-in store implementations.
+#include "dummy-store.hh"
+#include "http-binary-cache-store.hh"
+#include "legacy-ssh-store.hh"
+#include "local-binary-cache-store.hh"
+#include "local-store.hh"
+#include "s3-binary-cache-store.hh"
+#include "ssh-store.hh"
+#include "uds-remote-store.hh"
+
 namespace nix {
 
 
@@ -396,6 +406,17 @@ static void preloadNSS()
     });
 }
 
+static void registerStoreImplementations() {
+  registerDummyStore();
+  registerHttpBinaryCacheStore();
+  registerLegacySSHStore();
+  registerLocalBinaryCacheStore();
+  registerLocalStore();
+  registerS3BinaryCacheStore();
+  registerSSHStore();
+  registerUDSRemoteStore();
+}
+
 static bool initLibStoreDone = false;
 
 void assertLibStoreInitialized() {
@@ -433,6 +454,8 @@ void initLibStore() {
         unsetenv("TMPDIR");
 #endif
 
+    registerStoreImplementations();
+
     initLibStoreDone = true;
 }
 

src/libstore/http-binary-cache-store.cc

@@ -1,3 +1,4 @@
+#include "http-binary-cache-store.hh"
 #include "binary-cache-store.hh"
 #include "filetransfer.hh"
 #include "globals.hh"
@@ -194,6 +195,8 @@ protected:
     }
 };
 
-static RegisterStoreImplementation<HttpBinaryCacheStore, HttpBinaryCacheStoreConfig> regHttpBinaryCacheStore;
+void registerHttpBinaryCacheStore() {
+    StoreImplementations::add<HttpBinaryCacheStore, HttpBinaryCacheStoreConfig>();
+}
 
 }

src/libstore/http-binary-cache-store.hh

@@ -0,0 +1,8 @@
+#pragma once
+///@file
+
+namespace nix {
+
+void registerHttpBinaryCacheStore();
+
+}

src/libstore/legacy-ssh-store.cc

@@ -1,4 +1,4 @@
-#include "ssh-store-config.hh"
+#include "legacy-ssh-store.hh"
 #include "archive.hh"
 #include "pool.hh"
 #include "remote-store.hh"
@@ -8,6 +8,7 @@
 #include "store-api.hh"
 #include "path-with-outputs.hh"
 #include "ssh.hh"
+#include "ssh-store.hh"
 #include "derivations.hh"
 
 namespace nix {
@@ -412,6 +413,8 @@ public:
     { unsupported("queryRealisation"); }
 };
 
-static RegisterStoreImplementation<LegacySSHStore, LegacySSHStoreConfig> regLegacySSHStore;
+void registerLegacySSHStore() {
+    StoreImplementations::add<LegacySSHStore, LegacySSHStoreConfig>();
+}
 
 }

src/libstore/legacy-ssh-store.hh

@@ -0,0 +1,8 @@
+#pragma once
+///@file
+
+namespace nix {
+
+void registerLegacySSHStore();
+
+}

src/libstore/local-binary-cache-store.cc

@@ -1,3 +1,4 @@
+#include "local-binary-cache-store.hh"
 #include "binary-cache-store.hh"
 #include "globals.hh"
 #include "nar-info-disk-cache.hh"
@@ -124,6 +125,8 @@ std::set<std::string> LocalBinaryCacheStore::uriSchemes()
         return {"file"};
 }
 
-static RegisterStoreImplementation<LocalBinaryCacheStore, LocalBinaryCacheStoreConfig> regLocalBinaryCacheStore;
+void registerLocalBinaryCacheStore() {
+    StoreImplementations::add<LocalBinaryCacheStore, LocalBinaryCacheStoreConfig>();
+}
 
 }

src/libstore/local-binary-cache-store.hh

@@ -0,0 +1,8 @@
+#pragma once
+///@file
+
+namespace nix {
+
+void registerLocalBinaryCacheStore();
+
+}

src/libstore/local-store.hh

@@ -421,4 +421,7 @@ void canonicaliseTimestampAndPermissions(const Path & path);
 
 MakeError(PathInUse, Error);
 
+// Implemented by the relevant platform/ module being used.
+void registerLocalStore();
+
 }

src/libstore/meson.build

@@ -118,12 +118,16 @@ libstore_headers = files(
   'derived-path-map.hh',
   'derived-path.hh',
   'downstream-placeholder.hh',
+  'dummy-store.hh',
   'filetransfer.hh',
   'fs-accessor.hh',
   'gc-store.hh',
   'globals.hh',
+  'http-binary-cache-store.hh',
   'indirect-root-store.hh',
+  'legacy-ssh-store.hh',
   'length-prefixed-protocol-helper.hh',
+  'local-binary-cache-store.hh',
   'local-fs-store.hh',
   'local-store.hh',
   'lock.hh',
@@ -152,8 +156,8 @@ libstore_headers = files(
   'serve-protocol-impl.hh',
   'serve-protocol.hh',
   'sqlite.hh',
-  'ssh-store-config.hh',
   'ssh.hh',
+  'ssh-store.hh',
   'store-api.hh',
   'store-cast.hh',
   'uds-remote-store.hh',

src/libstore/platform/darwin.cc

@@ -261,4 +261,9 @@ void DarwinLocalDerivationGoal::execBuilder(std::string builder, Strings args, S
 
     posix_spawn(nullptr, builder.c_str(), nullptr, &attrp, stringsToCharPtrs(args).data(), stringsToCharPtrs(envStrs).data());
 }
+
+void registerLocalStore() {
+    StoreImplementations::add<DarwinLocalStore, LocalStoreConfig>();
+}
+
 }

src/libstore/platform/fallback.cc

@@ -1,5 +1,7 @@
 #include "platform/fallback.hh"
 
 namespace nix {
-static RegisterStoreImplementation<FallbackLocalStore, LocalStoreConfig> regLocalStore;
+void registerLocalStore() {
+    Implementations::add<FallbackLocalStore, LocalStoreConfig>();
+}
 }

src/libstore/platform/linux.cc

@@ -25,7 +25,9 @@ namespace {
 constexpr const std::string_view nativeSystem = SYSTEM;
 }
 
-static RegisterStoreImplementation<LinuxLocalStore, LocalStoreConfig> regLocalStore;
+void registerLocalStore() {
+    StoreImplementations::add<LinuxLocalStore, LocalStoreConfig>();
+}
 
 static void readProcLink(const std::string & file, UncheckedRoots & roots)
 {

src/libstore/s3-binary-cache-store.cc

@@ -526,8 +526,14 @@ struct S3BinaryCacheStoreImpl : virtual S3BinaryCacheStoreConfig, public virtual
 
 };
 
-static RegisterStoreImplementation<S3BinaryCacheStoreImpl, S3BinaryCacheStoreConfig> regS3BinaryCacheStore;
+void registerS3BinaryCacheStore() {
+    StoreImplementations::add<S3BinaryCacheStoreImpl, S3BinaryCacheStoreConfig>();
+}
 
 }
 
+#else
+namespace nix {
+void registerS3BinaryCacheStore() {}
+}
 #endif

src/libstore/s3-binary-cache-store.hh

@@ -29,4 +29,6 @@ public:
     virtual const Stats & getS3Stats() = 0;
 };
 
+void registerS3BinaryCacheStore();
+
 }

src/libstore/ssh-store.cc

@@ -1,4 +1,4 @@
-#include "ssh-store-config.hh"
+#include "ssh-store.hh"
 #include "store-api.hh"
 #include "local-fs-store.hh"
 #include "remote-store.hh"
@@ -110,6 +110,8 @@ ref<RemoteStore::Connection> SSHStore::openConnection()
     return conn;
 }
 
-static RegisterStoreImplementation<SSHStore, SSHStoreConfig> regSSHStore;
+void registerSSHStore() {
+    StoreImplementations::add<SSHStore, SSHStoreConfig>();
+}
 
 }

src/libstore/ssh-store.hh

@@ -26,4 +26,6 @@ struct CommonSSHStoreConfig : virtual StoreConfig
         )"};
 };
 
+void registerSSHStore();
+
 }

src/libstore/store-api.cc

@@ -1472,7 +1472,7 @@ ref<Store> openStore(const std::string & uri_,
             parsedUri.authority.value_or("") + parsedUri.path
         );
 
-        for (auto implem : *Implementations::registered) {
+        for (auto implem : *StoreImplementations::registered) {
             if (implem.uriSchemes.count(parsedUri.scheme)) {
                 auto store = implem.create(parsedUri.scheme, baseURI, params);
                 if (store) {
@@ -1526,6 +1526,6 @@ std::list<ref<Store>> getDefaultSubstituters()
     return stores;
 }
 
-std::vector<StoreFactory> * Implementations::registered = 0;
+std::vector<StoreFactory> * StoreImplementations::registered = 0;
 
 }

src/libstore/store-api.hh

@@ -50,11 +50,9 @@ namespace nix {
  *   that calls `StoreConfig(params)` (otherwise you're gonna encounter an
  *   `assertion failure` when trying to instantiate it).
  *
- * You can then register the new store using:
- *
- * ```
- * cpp static RegisterStoreImplementation<Foo, FooConfig> regStore;
- * ```
+ * You can then register the new store by defining a registration function
+ * (using `StoreImplementations::add`) and calling it in
+ * `registerStoreImplementations` in `globals.cc`.
  */
 
 MakeError(SubstError, Error);
@@ -1004,7 +1002,7 @@ struct StoreFactory
     std::function<std::shared_ptr<StoreConfig> ()> getConfig;
 };
 
-struct Implementations
+struct StoreImplementations
 {
     static std::vector<StoreFactory> * registered;
 
@@ -1027,15 +1025,6 @@ struct Implementations
     }
 };
 
-template<typename T, typename TConfig>
-struct RegisterStoreImplementation
-{
-    RegisterStoreImplementation()
-    {
-        Implementations::add<T, TConfig>();
-    }
-};
-
 
 /**
  * Display a set of paths in human-readable form (i.e., between quotes

src/libstore/uds-remote-store.cc

@@ -88,6 +88,8 @@ void UDSRemoteStore::addIndirectRoot(const Path & path)
 }
 
 
-static RegisterStoreImplementation<UDSRemoteStore, UDSRemoteStoreConfig> regUDSRemoteStore;
+void registerUDSRemoteStore() {
+    StoreImplementations::add<UDSRemoteStore, UDSRemoteStoreConfig>();
+}
 
 }

src/libstore/uds-remote-store.hh

@@ -63,4 +63,6 @@ private:
     std::optional<std::string> path;
 };
 
+void registerUDSRemoteStore();
+
 }

src/nix/main.cc

@@ -201,7 +201,7 @@ struct NixArgs : virtual MultiCommand, virtual MixCommonArgs, virtual RootArgs
         res["args"] = toJSON();
 
         auto stores = nlohmann::json::object();
-        for (auto & implem : *Implementations::registered) {
+        for (auto & implem : *StoreImplementations::registered) {
             auto storeConfig = implem.getConfig();
             auto storeName = storeConfig->name();
             auto & j = stores[storeName];