src/libmain/shared.cc

@@ -178,7 +178,7 @@ static void initAndRun(int argc, char * * argv)
             buildVerbosity = lvlVomit;
         
         //we need to push back since arguments need to be passed on in the state wrapper script
-        else if (arg == "--help") {
+        else if (arg == "--help" && programId != "nix-state") {
             printHelp();
             remaining.push_back(arg);
         }

src/libstore/local-store.cc

@@ -1837,6 +1837,11 @@ Path toNonSharedPathTxn(const Transaction & txn, const Path & statePath)
 	return returnedPath;
 }
 
+bool LocalStore::getSharedWith(const Path & statePath1, Path & statePath2)
+{
+	return querySharedStateTxn(noTxn, statePath1, statePath2);
+}
+
 PathSet toNonSharedPathSetTxn(const Transaction & txn, const PathSet & statePaths)
 {
 	PathSet real_statePaths;

src/libstore/local-store.hh

@@ -110,6 +110,8 @@ public:
 	
 	void scanAndUpdateAllReferences(const Path & statePath, const bool recursive);
 	
+	bool getSharedWith(const Path & statePath1, Path & statePath2);
+	
 	PathSet toNonSharedPathSet(const PathSet & statePaths);
 	
 	void revertToRevision(const Path & statePath, const unsigned int revision_arg, const bool recursive);

src/libstore/remote-store.cc

@@ -286,7 +286,6 @@ Path RemoteStore::addTextToStore(const string & suffix, const string & s,
     writeString(suffix, to);
     writeString(s, to);
     writeStringSet(references, to);
-    
     processStderr();
     return readStorePath(from);
 }
@@ -310,7 +309,6 @@ Path RemoteStore::importPath(bool requireSignature, Source & source)
        anyway. */
     
     processStderr(0, &source);
-    //Path path = readStorePath(from);			//TODO !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!	remove 
     return readStorePath(from);
 }
 
@@ -504,6 +502,15 @@ void RemoteStore::scanAndUpdateAllReferences(const Path & statePath, const bool
 	readInt(from);
 }
 
+bool RemoteStore::getSharedWith(const Path & statePath1, Path & statePath2)
+{
+	writeInt(wopGetSharedWith, to);
+	writeString(statePath1, to);
+	processStderr();
+	statePath2 = readString(from);
+	unsigned int reply = readInt(from);
+    return reply != 0;
+}
 
 PathSet RemoteStore::toNonSharedPathSet(const PathSet & statePaths)
 {

src/libstore/remote-store.hh

@@ -96,6 +96,8 @@ public:
 	
 	void scanAndUpdateAllReferences(const Path & statePath, const bool recursive);
 	
+	bool getSharedWith(const Path & statePath1, Path & statePath2);
+	
 	PathSet toNonSharedPathSet(const PathSet & statePaths);
 	
 	void revertToRevision(const Path & statePath, const unsigned int revision_arg, const bool recursive);

src/libstore/store-api.hh

@@ -237,6 +237,9 @@ public:
 	/* TODO */
 	virtual void scanAndUpdateAllReferences(const Path & statePath, const bool recursive) = 0;
 	
+	/* TODO */
+	virtual bool getSharedWith(const Path & statePath1, Path & statePath2) = 0;
+	
 	/* TODO */
 	virtual PathSet toNonSharedPathSet(const PathSet & statePaths) = 0;
 	

src/libstore/worker-protocol.hh

@@ -44,6 +44,7 @@ typedef enum {
 	wopQueryAvailableStateRevisions,		
 	wopCommitStatePath,
 	wopScanAndUpdateAllReferences,
+	wopGetSharedWith,
 	wopToNonSharedPathSet,
 	wopRevertToRevision,
 	wopShareState,

src/nix-env/nix-env.cc

@@ -566,7 +566,7 @@ static void installDerivations(Globals & globals,
         		//&& the identifiers are equal
         		
         		//TODO !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
-        		//TODO && (the users are equal || OR SHARED BETWEEN USERS)			
+        		//TODO && (the users are equal || OR SHARED BETWEEN USERS)		isnt this already user specific?		
         		//TODO 
         		if(	newSharedState == "" 
         			&&
@@ -621,7 +621,6 @@ static void installDerivations(Globals & globals,
 		store->shareState(i->second, i->first, false);
     }
     
-    
     //**********************
 
     //Let the stateDirs in /nix/state point to the solidStateDependencies

src/nix-state/help.txt

@@ -2,8 +2,41 @@ Usage: nix-state [OPTIONS...] [ARGUMENTS...]
 
 `nix-state' is a tool to manipulate the Nix state-store and to run programs.
 
-Operations:
+Run Operations:
 
+  --run / -r: run and commit state
+  --commit-only: commit state
+  --run-only: run
+  --scan-only: scan for references
+
+Run Options:		
+
+  --scanreferences: set scan for references
+  --comment=...: Add a comment for commiting  
+
+Information:
+
+  --showstatepath: print the state path
+  --showderivations: print all derivations of this path
+  --showrevisions: show all revisions of the state path
+  --showsharedpaths: show where this path points to
   --version: output version information
   --help: display help
 
+Share state Operations:
+
+  --unshare: unshare this path
+  --share-with a b: make the path a point to the path b
+
+Share state Options:
+
+  --unshare-branch-state: 
+  --unshare-restore-old-state: 
+ 
+Revert state Operations:
+
+  --revert-to-revision=x: revert to revision x
+
+Revert state Options:
+
+  --revert-to-revision-recursively: revert recursively

src/nix-state/nix-state.cc

@@ -32,6 +32,8 @@ bool r_scanforReferences = false;
 bool r_commit = true;
 bool r_run = true;
 bool revert_recursively = false;
+bool unshare_branch = false;
+bool unshare_restore_old = false;
 
 
 /************************* Build time Functions ******************************/
@@ -243,6 +245,36 @@ static void queryAvailableStateRevisions(Strings opFlags, Strings opArgs)
 }
 
 
+static void opShowSharedPaths(Strings opFlags, Strings opArgs)
+{
+	Path statePath = *(opArgs.begin());
+	if(!store->isValidStatePath(statePath))
+		throw UsageError(format("Path '%1%' is not a valid state path.") % statePath);
+		
+	Path statePath1 = statePath;
+	Path statePath2;
+	bool isShared = false;
+	while(store->getSharedWith(statePath1, statePath2))
+	{
+		isShared = true;
+		printMsg(lvlError, format("Path '%1%' ---is shared with---> '%2%'") % statePath1 % statePath2);
+		statePath1 = statePath2;
+	}
+	
+	if(!isShared)
+		printMsg(lvlError, format("Path '%1%' is not shared with another path") % statePath1);
+}
+
+static void opUnshare(Strings opFlags, Strings opArgs)
+{
+	
+}
+
+static void opShareWith(Strings opFlags, Strings opArgs)
+{
+	
+}
+
 
 static void opRunComponent(Strings opFlags, Strings opArgs)
 {
@@ -272,8 +304,15 @@ static void opRunComponent(Strings opFlags, Strings opArgs)
     	
     	string root_args = "";
     	for (Strings::iterator i = root_program_args.begin(); i != root_program_args.end(); ++i){
-    		if(*i == "--help" || *i == "--version")
+    		if(*i == "--help" || *i == "--version"){
+    			printMsg(lvlError, format("Usage: try --statehelp for extended state help options"));
+    			printMsg(lvlError, format("%1%") % padd("", '-', 54));
+    		}
+    		else if(*i == "--statehelp"){
     			printMsg(lvlError, format("%1%") % padd("", '-', 100));
+    			printHelp();
+    		}
+    		
     		//printMsg(lvlError, format("ARG %1%") % *i);
     		root_args += " \"" + *i + "\"";
     		
@@ -522,7 +561,6 @@ void run(Strings args)
         Operation oldOp = op;
 		
 		//Run options
-		
         if (arg == "--run" || arg == "-r")		//run and commit
             op = opRunComponent;
         else if (arg == "--commit-only"){
@@ -551,7 +589,6 @@ void run(Strings args)
     	
     	
     	//Info options
-    	
 		else if (arg == "--showstatepath")
 			op = opShowStatePath;
 		else if (arg == "--showderivations")
@@ -560,17 +597,28 @@ void run(Strings args)
 			op = queryAvailableStateRevisions;
 			
 		
-		//State options
+		//Revering State options
-		
 		else if (arg.substr(0,21) == "--revert-to-revision="){
 			op = revertToRevision;
 			bool succeed = string2UnsignedInt(arg.substr(21,arg.length()), revision_arg);
 			if(!succeed)
 				throw UsageError("The given revision is not a valid number");
 		}
-		else if (arg.substr(0,10) == "--revert-to-revision-recursively")
+		else if (arg == "--revert-to-revision-recursively")
         	revert_recursively = true;	
 		
+		//Shared state options
+		else if (arg == "--showsharedpaths")	
+			op = opShowSharedPaths;
+		else if (arg == "--unshare")
+			op = opUnshare;
+		else if (arg == "--unshare-branch-state")
+			unshare_branch = true;
+		else if (arg == "--unshare-restore-old-state")
+			unshare_restore_old = true;
+		else if (arg == "--share-with")
+			op = opShareWith;
+		
 	    /*
 		--share-from
 		

src/nix-store/nix-store.cc

@@ -431,7 +431,7 @@ static void opRegisterSubstitutes(Strings opFlags, Strings opArgs)
         Substitute sub;
         PathSet references;
         
-        //TODO TODO TODO !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!1
+        //TODO TODO TODO !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
         PathSet stateReferences;
         
         getline(cin, srcPath);

src/nix-worker/nix-worker.cc

@@ -571,6 +571,17 @@ static void performOp(Source & from, Sink & to, unsigned int op)
     	break;
     }
     
+    case wopGetSharedWith: {
+		Path statePath1 = readString(from);
+		Path statePath2;
+		startWork();
+        bool result = store->getSharedWith(statePath1, statePath2);
+        stopWork();
+        writeString(statePath2, to);
+        writeInt(result, to);
+    	break;
+	}
+    
 	case wopToNonSharedPathSet: {
     	PathSet statePaths = readStringSet(from);
     	startWork();