3 files changed, 32 insertions, 5 deletions
diff --git a/src/libstore/Makefile.am b/src/libstore/Makefile.am
index 1f294fde6609..0801cba07138 100644
--- a/src/libstore/Makefile.am
+++ b/src/libstore/Makefile.am
@@ -6,7 +6,8 @@ libstore_la_SOURCES = \
 
 pkginclude_HEADERS = \
  store-api.hh local-store.cc remote-store.cc derivations.hh misc.hh \
- globals.hh db.hh references.hh pathlocks.hh gc.hh 
+ globals.hh db.hh references.hh pathlocks.hh gc.hh  \
+ worker-protocol.hh
 
 libstore_la_LIBADD = ../libutil/libutil.la ../boost/format/libformat.la
 
diff --git a/src/libstore/remote-store.cc b/src/libstore/remote-store.cc
index 6f3c110a3df8..f59fe8b982fe 100644
--- a/src/libstore/remote-store.cc
+++ b/src/libstore/remote-store.cc
@@ -1,6 +1,7 @@
 #include "serialise.hh"
 #include "util.hh"
 #include "remote-store.hh"
+#include "worker-protocol.hh"
 
 #include <iostream>
 #include <unistd.h>
@@ -55,27 +56,36 @@ RemoteStore::RemoteStore()
 
     
     /* Send the magic greeting, check for the reply. */
-    writeInt(0x6e697864, to);
+    writeInt(WORKER_MAGIC_1, to);
     
     unsigned int magic = readInt(from);
-    if (magic != 0x6478696e) throw Error("protocol mismatch");
+    if (magic != WORKER_MAGIC_2) throw Error("protocol mismatch");
 }
 
 
 RemoteStore::~RemoteStore()
 {
+    writeInt(wopQuit, to);
+    readInt(from);
+    child.wait(true);
 }
 
 
 bool RemoteStore::isValidPath(const Path & path)
 {
-    throw Error("not implemented");
+    writeInt(wopIsValidPath, to);
+    writeString(path, to);
+    unsigned int reply = readInt(from);
+    return reply != 0;
 }
 
 
 Substitutes RemoteStore::querySubstitutes(const Path & srcPath)
 {
-    throw Error("not implemented");
+    //    writeInt(wopQuerySubstitutes);
+    
+    // throw Error("not implemented 2");
+    return Substitutes();
 }
 
 
diff --git a/src/libstore/worker-protocol.hh b/src/libstore/worker-protocol.hh
new file mode 100644
index 000000000000..0ba0c374ec92
--- /dev/null
+++ b/src/libstore/worker-protocol.hh
@@ -0,0 +1,16 @@
+#ifndef __WORKER_PROTOCOL_H
+#define __WORKER_PROTOCOL_H
+
+
+#define WORKER_MAGIC_1 0x6e697864
+#define WORKER_MAGIC_2 0x6478696e
+
+
+typedef enum {
+    wopQuit = 0,
+    wopIsValidPath = 1,
+    wopQuerySubstitutes = 2,
+} WorkerOp;
+
+
+#endif /* !__WORKER_PROTOCOL_H */