GetDataDir(): cache paths for each network separately

src/chainparams.h

@@ -39,6 +39,8 @@ public:
         MAIN,
         TESTNET,
         REGTEST,
+
+        MAX_NETWORK_TYPES
     };
 
     enum Base58Type {

src/util.cpp

@@ -8,6 +8,7 @@
 #ifdef __linux__
 #define _POSIX_C_SOURCE 200112L
 #endif
+#include <algorithm>
 #include <fcntl.h>
 #include <sys/stat.h>
 #include <sys/resource.h>
@@ -83,7 +84,6 @@ bool fNoListen = false;
 bool fLogTimestamps = false;
 CMedianFilter<int64> vTimeOffsets(200,0);
 volatile bool fReopenDebugLog = false;
-bool fCachedPath[2] = {false, false};
 
 // Init OpenSSL library multithreading support
 static CCriticalSection** ppmutexOpenSSL;
@@ -1043,22 +1043,25 @@ boost::filesystem::path GetDefaultDataDir()
 #endif
 }
 
+static boost::filesystem::path pathCached[CChainParams::MAX_NETWORK_TYPES+1];
+static CCriticalSection csPathCached;
+
 const boost::filesystem::path &GetDataDir(bool fNetSpecific)
 {
     namespace fs = boost::filesystem;
 
-    static fs::path pathCached[2];
-    static CCriticalSection csPathCached;
+    LOCK(csPathCached);
 
-    fs::path &path = pathCached[fNetSpecific];
+    int nNet = CChainParams::MAX_NETWORK_TYPES;
+    if (fNetSpecific) nNet = Params().NetworkID();
+
+    fs::path &path = pathCached[nNet];
 
     // This can be called during exceptions by printf, so we cache the
     // value so we don't have to do memory allocations after that.
-    if (fCachedPath[fNetSpecific])
+    if (!path.empty())
         return path;
 
-    LOCK(csPathCached);
-
     if (mapArgs.count("-datadir")) {
         path = fs::system_complete(mapArgs["-datadir"]);
         if (!fs::is_directory(path)) {
@@ -1073,10 +1076,15 @@ const boost::filesystem::path &GetDataDir(bool fNetSpecific)
 
     fs::create_directories(path);
 
-    fCachedPath[fNetSpecific] = true;
     return path;
 }
 
+void ClearDatadirCache()
+{
+    std::fill(&pathCached[0], &pathCached[CChainParams::MAX_NETWORK_TYPES+1],
+              boost::filesystem::path());
+}
+
 boost::filesystem::path GetConfigFile()
 {
     boost::filesystem::path pathConfigFile(GetArg("-conf", "bitcoin.conf"));
@@ -1091,9 +1099,6 @@ void ReadConfigFile(map<string, string>& mapSettingsRet,
     if (!streamConfig.good())
         return; // No bitcoin.conf file is OK
 
-    // clear path cache after loading config file
-    fCachedPath[0] = fCachedPath[1] = false;
-
     set<string> setOptions;
     setOptions.insert("*");
 
@@ -1109,6 +1114,8 @@ void ReadConfigFile(map<string, string>& mapSettingsRet,
         }
         mapMultiSettingsRet[strKey].push_back(it->value[0]);
     }
+    // If datadir is changed in .conf file:
+    ClearDatadirCache();
 }
 
 boost::filesystem::path GetPidFile()