* importPath() -> importPaths(). Because of buffering of the input

  stream it's now necessary for the daemon to process the entire
  sequence of exported paths, rather than letting the client do it.

6 files changed, 45 insertions, 29 deletions

diff --git a/src/libstore/local-store.cc b/src/libstore/local-store.cc
index 65b1cdbc87a3..cf0e2ad1b13b 100644
--- a/src/libstore/local-store.cc
+++ b/src/libstore/local-store.cc
@@ -1156,7 +1156,7 @@ void LocalStore::exportPath(const Path & path, bool sign,
     
     PathSet references;
     queryReferences(path, references);
-    writeStringSet(references, hashAndWriteSink);
+    writeStrings(references, hashAndWriteSink);
 
     Path deriver = queryDeriver(path);
     writeString(deriver, hashAndWriteSink);
@@ -1243,7 +1243,7 @@ Path LocalStore::importPath(bool requireSignature, Source & source)
 
     Path dstPath = readStorePath(hashAndReadSource);
 
-    PathSet references = readStorePaths(hashAndReadSource);
+    PathSet references = readStorePaths<PathSet>(hashAndReadSource);
 
     Path deriver = readString(hashAndReadSource);
     if (deriver != "") assertStorePath(deriver);
@@ -1330,6 +1330,19 @@ Path LocalStore::importPath(bool requireSignature, Source & source)
 }
 
 
+Paths LocalStore::importPaths(bool requireSignature, Source & source)
+{
+    Paths res;
+    while (true) {
+        unsigned long long n = readLongLong(source);
+        if (n == 0) break;
+        if (n != 1) throw Error("input doesn't look like something created by `nix-store --export'");
+        res.push_back(importPath(requireSignature, source));
+    }
+    return res;
+}
+
+
 void LocalStore::deleteFromStore(const Path & path, unsigned long long & bytesFreed,
     unsigned long long & blocksFreed)
 {
diff --git a/src/libstore/local-store.hh b/src/libstore/local-store.hh
index 7ef01b2644b4..4cb905f67231 100644
--- a/src/libstore/local-store.hh
+++ b/src/libstore/local-store.hh
@@ -146,7 +146,7 @@ public:
     void exportPath(const Path & path, bool sign,
         Sink & sink);
 
-    Path importPath(bool requireSignature, Source & source);
+    Paths importPaths(bool requireSignature, Source & source);
     
     void buildDerivations(const PathSet & drvPaths);
 
@@ -259,6 +259,8 @@ private:
 
     Path createTempDirInStore();
 
+    Path importPath(bool requireSignature, Source & source);
+    
     void checkDerivationOutputs(const Path & drvPath, const Derivation & drv);
 };
 
diff --git a/src/libstore/remote-store.cc b/src/libstore/remote-store.cc
index e976e8fa57ae..942c5bcf1c7c 100644
--- a/src/libstore/remote-store.cc
+++ b/src/libstore/remote-store.cc
@@ -27,13 +27,15 @@ Path readStorePath(Source & from)
 }
 
 
-PathSet readStorePaths(Source & from)
+template<class T> T readStorePaths(Source & from)
 {
-    PathSet paths = readStringSet(from);
-    foreach (PathSet::iterator, i, paths) assertStorePath(*i);
+    T paths = readStrings<T>(from);
+    foreach (typename T::iterator, i, paths) assertStorePath(*i);
     return paths;
 }
 
+template PathSet readStorePaths(Source & from);
+
 
 RemoteStore::RemoteStore()
 {
@@ -215,7 +217,7 @@ PathSet RemoteStore::queryValidPaths()
     openConnection();
     writeInt(wopQueryValidPaths, to);
     processStderr();
-    return readStorePaths(from);
+    return readStorePaths<PathSet>(from);
 }
 
 
@@ -242,7 +244,7 @@ bool RemoteStore::querySubstitutablePathInfo(const Path & path,
     if (reply == 0) return false;
     info.deriver = readString(from);
     if (info.deriver != "") assertStorePath(info.deriver);
-    info.references = readStorePaths(from);
+    info.references = readStorePaths<PathSet>(from);
     info.downloadSize = readLongLong(from);
     info.narSize = GET_PROTOCOL_MINOR(daemonVersion) >= 7 ? readLongLong(from) : 0;
     return true;
@@ -260,7 +262,7 @@ ValidPathInfo RemoteStore::queryPathInfo(const Path & path)
     info.deriver = readString(from);
     if (info.deriver != "") assertStorePath(info.deriver);
     info.hash = parseHash(htSHA256, readString(from));
-    info.references = readStorePaths(from);
+    info.references = readStorePaths<PathSet>(from);
     info.registrationTime = readInt(from);
     info.narSize = readLongLong(from);
     return info;
@@ -285,7 +287,7 @@ void RemoteStore::queryReferences(const Path & path,
     writeInt(wopQueryReferences, to);
     writeString(path, to);
     processStderr();
-    PathSet references2 = readStorePaths(from);
+    PathSet references2 = readStorePaths<PathSet>(from);
     references.insert(references2.begin(), references2.end());
 }
 
@@ -297,7 +299,7 @@ void RemoteStore::queryReferrers(const Path & path,
     writeInt(wopQueryReferrers, to);
     writeString(path, to);
     processStderr();
-    PathSet referrers2 = readStorePaths(from);
+    PathSet referrers2 = readStorePaths<PathSet>(from);
     referrers.insert(referrers2.begin(), referrers2.end());
 }
 
@@ -320,7 +322,7 @@ PathSet RemoteStore::queryDerivationOutputs(const Path & path)
     writeInt(wopQueryDerivationOutputs, to);
     writeString(path, to);
     processStderr();
-    return readStorePaths(from);
+    return readStorePaths<PathSet>(from);
 }
 
 
@@ -350,7 +352,7 @@ Path RemoteStore::addTextToStore(const string & name, const string & s,
     writeInt(wopAddTextToStore, to);
     writeString(name, to);
     writeString(s, to);
-    writeStringSet(references, to);
+    writeStrings(references, to);
     
     processStderr();
     return readStorePath(from);
@@ -369,14 +371,14 @@ void RemoteStore::exportPath(const Path & path, bool sign,
 }
 
 
-Path RemoteStore::importPath(bool requireSignature, Source & source)
+Paths RemoteStore::importPaths(bool requireSignature, Source & source)
 {
     openConnection();
-    writeInt(wopImportPath, to);
+    writeInt(wopImportPaths, to);
     /* We ignore requireSignature, since the worker forces it to true
        anyway. */
     processStderr(0, &source);
-    return readStorePath(from);
+    return readStorePaths<Paths>(from);
 }
 
 
@@ -384,7 +386,7 @@ void RemoteStore::buildDerivations(const PathSet & drvPaths)
 {
     openConnection();
     writeInt(wopBuildDerivations, to);
-    writeStringSet(drvPaths, to);
+    writeStrings(drvPaths, to);
     processStderr();
     readInt(from);
 }
@@ -451,7 +453,7 @@ void RemoteStore::collectGarbage(const GCOptions & options, GCResults & results)
     
     writeInt(wopCollectGarbage, to);
     writeInt(options.action, to);
-    writeStringSet(options.pathsToDelete, to);
+    writeStrings(options.pathsToDelete, to);
     writeInt(options.ignoreLiveness, to);
     writeLongLong(options.maxFreed, to);
     writeInt(options.maxLinks, to);
@@ -463,7 +465,7 @@ void RemoteStore::collectGarbage(const GCOptions & options, GCResults & results)
     
     processStderr();
     
-    results.paths = readStringSet(from);
+    results.paths = readStrings<PathSet>(from);
     results.bytesFreed = readLongLong(from);
     results.blocksFreed = readLongLong(from);
 }
@@ -474,7 +476,7 @@ PathSet RemoteStore::queryFailedPaths()
     openConnection();
     writeInt(wopQueryFailedPaths, to);
     processStderr();
-    return readStorePaths(from);
+    return readStorePaths<PathSet>(from);
 }
 
 
@@ -482,7 +484,7 @@ void RemoteStore::clearFailedPaths(const PathSet & paths)
 {
     openConnection();
     writeInt(wopClearFailedPaths, to);
-    writeStringSet(paths, to);
+    writeStrings(paths, to);
     processStderr();
     readInt(from);
 }
@@ -504,8 +506,7 @@ void RemoteStore::processStderr(Sink * sink, Source * source)
             size_t len = readInt(from);
             unsigned char * buf = new unsigned char[len];
             AutoDeleteArray<unsigned char> d(buf);
-            size_t n = source->read(buf, len);
-            writeString(string((const char *) buf, n), to); // !!! inefficient
+            writeString(buf, source->read(buf, len), to);
             to.flush();
         }
         else {
diff --git a/src/libstore/remote-store.hh b/src/libstore/remote-store.hh
index 519f46fd1a6d..34a2d91dfcd1 100644
--- a/src/libstore/remote-store.hh
+++ b/src/libstore/remote-store.hh
@@ -56,7 +56,7 @@ public:
     void exportPath(const Path & path, bool sign,
         Sink & sink);
 
-    Path importPath(bool requireSignature, Source & source);
+    Paths importPaths(bool requireSignature, Source & source);
     
     void buildDerivations(const PathSet & drvPaths);
 
diff --git a/src/libstore/store-api.hh b/src/libstore/store-api.hh
index e3a2c0daa20c..d4997c886207 100644
--- a/src/libstore/store-api.hh
+++ b/src/libstore/store-api.hh
@@ -169,9 +169,9 @@ public:
     virtual void exportPath(const Path & path, bool sign,
         Sink & sink) = 0;
 
-    /* Import a NAR dump created by exportPath() into the Nix
-       store. */
-    virtual Path importPath(bool requireSignature, Source & source) = 0;
+    /* Import a sequence of NAR dumps created by exportPaths() into
+       the Nix store. */
+    virtual Paths importPaths(bool requireSignature, Source & source) = 0;
 
     /* Ensure that the output paths of the derivation are valid.  If
        they are already valid, this is a no-op.  Otherwise, validity
diff --git a/src/libstore/worker-protocol.hh b/src/libstore/worker-protocol.hh
index acabd6ca30d2..760d08a747ae 100644
--- a/src/libstore/worker-protocol.hh
+++ b/src/libstore/worker-protocol.hh
@@ -29,7 +29,6 @@ typedef enum {
     wopSyncWithGC = 13,
     wopFindRoots = 14,
     wopExportPath = 16,
-    wopImportPath = 17,
     wopQueryDeriver = 18,
     wopSetOptions = 19,
     wopCollectGarbage = 20,
@@ -39,6 +38,7 @@ typedef enum {
     wopQueryFailedPaths = 24,
     wopClearFailedPaths = 25,
     wopQueryPathInfo = 26,
+    wopImportPaths = 27,
 } WorkerOp;
 
 
@@ -58,7 +58,7 @@ typedef enum {
 
 
 Path readStorePath(Source & from);
-PathSet readStorePaths(Source & from);
+template<class T> T readStorePaths(Source & from);
 
     
 }