daemon: Do not deduplicate files smaller than 8 KiB.

[jackhill/guix/guix.git] / nix / libstore / local-store.hh

diff --git a/nix/libstore/local-store.hh b/nix/libstore/local-store.hh
index 6110468..20d3c3c 100644 (file)
--- a/nix/libstore/local-store.hh
+++ b/nix/libstore/local-store.hh
@@ -15,7 +15,7 @@ namespace nix {
 /* Nix store and database schema version.  Version 1 (or 0) was Nix <=
    0.7.  Version 2 was Nix 0.8 and 0.9.  Version 3 is Nix 0.10.
    Version 4 is Nix 0.11.  Version 5 is Nix 0.12-0.16.  Version 6 is
-   Nix 1.0.  Version 7 is Nix 1.3. */
+   Nix 1.0.  Version 7 is Nix 1.3.  Guix has always used version 7.  */
 const int nixSchemaVersion = 7;
 
 
@@ -38,22 +38,14 @@ struct OptimiseStats
 };
 
 
-struct RunningSubstituter
-{
-    Path program;
-    Pid pid;
-    AutoCloseFD to, from, error;
-    FdSource fromBuf;
-    bool disabled;
-    RunningSubstituter() : disabled(false) { };
-};
-
-
 class LocalStore : public StoreAPI
 {
 private:
-    typedef std::map<Path, RunningSubstituter> RunningSubstituters;
-    RunningSubstituters runningSubstituters;
+    /* The currently running substituter or empty.  */
+    std::shared_ptr<Agent> runningSubstituter;
+
+    /* Ensure the substituter is running and return it.  */
+    std::shared_ptr<Agent> substituter();
 
     Path linksDir;
 
@@ -93,8 +85,8 @@ public:
 
     PathSet querySubstitutablePaths(const PathSet & paths);
 
-    void querySubstitutablePathInfos(const Path & substituter,
-        PathSet & paths, SubstitutablePathInfos & infos);
+    void querySubstitutablePathInfos(PathSet & paths,
+        SubstitutablePathInfos & infos);
 
     void querySubstitutablePathInfos(const PathSet & paths,
         SubstitutablePathInfos & infos);
@@ -179,7 +171,7 @@ public:
 
     void markContentsGood(const Path & path);
 
-    void setSubstituterEnv();
+    void createUser(const std::string & userName, uid_t userId);
 
 private:
 
@@ -212,8 +204,6 @@ private:
     /* Cache for pathContentsGood(). */
     std::map<Path, bool> pathContentsGoodCache;
 
-    bool didSetSubstituterEnv;
-
     /* The file to which we write our temporary roots. */
     Path fnTempRoots;
     AutoCloseFD fdTempRoots;
@@ -244,11 +234,6 @@ private:
 
     void updatePathInfo(const ValidPathInfo & info);
 
-    void upgradeStore6();
-    void upgradeStore7();
-    PathSet queryValidPathsOld();
-    ValidPathInfo queryPathInfoOld(const Path & path);
-
     struct GCState;
 
     void deleteGarbage(GCState & state, const Path & path);
@@ -266,12 +251,9 @@ private:
 
     void removeUnusedLinks(const GCState & state);
 
-    void startSubstituter(const Path & substituter,
-        RunningSubstituter & runningSubstituter);
+    string getLineFromSubstituter(Agent & run);
 
-    string getLineFromSubstituter(RunningSubstituter & run);
-
-    template<class T> T getIntLineFromSubstituter(RunningSubstituter & run);
+    template<class T> T getIntLineFromSubstituter(Agent & run);
 
     Path createTempDirInStore();
 
@@ -310,4 +292,7 @@ void canonicaliseTimestampAndPermissions(const Path & path);
 
 MakeError(PathInUse, Error);
 
+/* Size below which a file is not considered for deduplication.  */
+extern const size_t deduplicationMinSize;
+
 }