Implemented runtime --share= and --unshare options. Fixed some things.

install_full.sh

@@ -48,7 +48,7 @@ fi
             --prefix=$nixstatepath \
             --with-store-dir=/nix/store \
 	    	--with-store-state-dir=/nix/state \
-            --with-ext3cow-header=/nix/store/8nirllv1w6qv6c5srjgah2m82bfi1d6k-linux-2.6.21.5/lib/modules/2.6.21.5-default/build/include/linux/ext3cow_fs.h \
+            --with-ext3cow-header=/nix/store/v95qf520d6972pshykrah1dz3z53rkmj-linux-2.6.21.7/lib/modules/2.6.21.7-default/build/include/linux/ext3cow_fs.h \
             --localstatedir=/nix/var
 
 

src/libstore/local-store.cc

@@ -1726,7 +1726,7 @@ bool querySolidStateReferencesTxn(const Transaction & txn, const Path & statePat
 	return notempty;
 }
 
-void unShareStateTxn(const Transaction & txn, const Path & path, const bool copyFromOld)
+void unShareStateTxn(const Transaction & txn, const Path & path, const bool branch, const bool restoreOld)		//TODO ADD BOOL YES/NO TO RESTORE OLD STATE (LAST REV.)
 {
 	//Check if is statePath
 	if(!isValidStatePathTxn(txn, path))
@@ -1740,23 +1740,31 @@ void unShareStateTxn(const Transaction & txn, const Path & path, const bool copy
 	//Remove Symlink
 	removeSymlink(path);
 
+	//Remove earlier entries (unshare)		(we must do this before revertToRevisionTxn)
+	nixDB.delPair(txn, dbSharedState, path);
+	
 	//Touch dir with correct rights
 	Derivation drv = derivationFromPathTxn(txn, queryStatePathDrvTxn(txn, path));
 	ensureStateDir(path, drv.stateOutputs.find("state")->second.username, "nixbld", "700");
 	
-	//Copy if necessary	(TODO first snapshot?)
+	if(branch && restoreOld)
-	if(copyFromOld){
+		throw Error(format("You cannot branch and restore the old state at the same time for path: '%1%' ") % path);
+
+	//Copy if necessary
+	if(branch){
 		copyContents(sharedWithOldPath, path);
 	}
 	
-	//Remove earlier entries (unshare)
+	//Restore the latest snapshot (non-recursive) made on this statepath
-	nixDB.delPair(txn, dbSharedState, path);
+	if(restoreOld){
+		revertToRevisionTxn(txn, path, 0, false);
+	}
 }
 
-void LocalStore::unShareState(const Path & path, const bool copyFromOld)
+void LocalStore::unShareState(const Path & path, const bool branch, const bool restoreOld)
 {
 	Transaction txn(nixDB);
-	unShareStateTxn(txn, path, copyFromOld);
+	unShareStateTxn(txn, path, branch, restoreOld);
 	txn.commit();
 }
 
@@ -1799,7 +1807,7 @@ void shareStateTxn(const Transaction & txn, const Path & from, const Path & to,
 	//If from was shared: unshare
 	Path empty;
 	if(querySharedStateTxn(txn, from, empty))
-		unShareStateTxn(txn, from, false);
+		unShareStateTxn(txn, from, false, false);
 
 	//Remove state path and link
 	deletePathWrapped(from);

src/libstore/local-store.hh

@@ -118,7 +118,7 @@ public:
 	
 	void shareState(const Path & from, const Path & to, const bool snapshot);
 	
-	void unShareState(const Path & path, const bool copyFromOld);
+	void unShareState(const Path & path, const bool branch, const bool restoreOld);
 };
 
 
@@ -246,7 +246,7 @@ void setSolidStateReferencesTxn(const Transaction & txn, const Path & statePath,
 bool querySolidStateReferencesTxn(const Transaction & txn, const Path & statePath, PathSet & paths);
 
 void shareStateTxn(const Transaction & txn, const Path & from, const Path & to, const bool snapshot);
-void unShareStateTxn(const Transaction & txn, const Path & path, const bool copyFromOld);
+void unShareStateTxn(const Transaction & txn, const Path & path, const bool branch, const bool restoreOld);
 
 PathSet toNonSharedPathSetTxn(const Transaction & txn, const PathSet & statePaths);
 Path toNonSharedPathTxn(const Transaction & txn, const Path & statePath);

src/libstore/remote-store.cc

@@ -540,11 +540,12 @@ void RemoteStore::shareState(const Path & from_arg, const Path & to_arg, const b
 	readInt(from);
 }
 
-void RemoteStore::unShareState(const Path & path, const bool copyFromOld)
+void RemoteStore::unShareState(const Path & path, const bool branch, const bool restoreOld)
 {
 	writeInt(wopUnShareState, to);
 	writeString(path, to);
-	writeInt(copyFromOld ? 1 : 0, to);
+	writeInt(branch ? 1 : 0, to);
+	writeInt(restoreOld ? 1 : 0, to);
 	processStderr();
 	readInt(from);
 }

src/libstore/remote-store.hh

@@ -104,7 +104,7 @@ public:
 	
 	void shareState(const Path & from, const Path & to, const bool snapshot);
 	
-	void unShareState(const Path & path, const bool copyFromOld);
+	void unShareState(const Path & path, const bool branch, const bool restoreOld);
 	
 private:
     AutoCloseFD fdSocket;

src/libstore/store-api.hh

@@ -250,7 +250,7 @@ public:
 	virtual void shareState(const Path & from, const Path & to, const bool snapshot) = 0;
 	
 	/* TODO */
-	virtual void unShareState(const Path & path, const bool copyFromOld) = 0;
+	virtual void unShareState(const Path & path, const bool branch, const bool restoreOld) = 0;
 };
 
 

src/libstore/store-state.cc

@@ -108,6 +108,12 @@ void revertToRevisionTxn(const Transaction & txn, const Path & statePath, const
     RevisionClosureTS getTimestamps;
 	queryStateRevisionsTxn(txn, statePath_ns, getRivisions, getTimestamps, revision_arg);
 
+	//TODO !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+	//include recursive
+	//lookup 0 (latest) to the real revision
+
+	
+
 	//Revert each statePath in the list
 	for (RevisionClosure::iterator i = getRivisions.begin(); i != getRivisions.end(); ++i){
 		Path statePath = (*i).first;
@@ -180,7 +186,7 @@ void revertToRevisionTxn(const Transaction & txn, const Path & statePath, const
 		}
 		
 		
-		//*** Now also revert state references to the specific revision (the revision is already converted to a timestamp here)
+		//*** Now also revert _state references_ to the specific revision (the revision is already converted to a timestamp here)
 		
 		//Query the references of the old revision (already converted to a timestamp)		
     	PathSet state_references;

src/libstore/store-state.hh

@@ -25,6 +25,7 @@ namespace nix {
 									
 	void scanAndUpdateAllReferencesRecusivelyTxn(const Transaction & txn, const Path & statePath);
 	
+	/* revision 0 == latest ????? */
 	void revertToRevisionTxn(const Transaction & txn, const Path & statePath, const int revision_arg, const bool recursive);
 
 	
@@ -54,7 +55,7 @@ namespace nix {
     bool queryStateReferences(Database & nixDB, const Transaction & txn, TableId references_table, TableId revisions_table,
     	const Path & statePath, Strings & references, const unsigned int revision = 0, const unsigned int timestamp = 0);		
 
-    /* Set the revision number of the statePath and the revision numbers of all state paths in the references closure */
+    /* Get the revision number of the statePath and the revision numbers of all state paths in the references closure */
     void setStateRevisions(Database & nixDB, const Transaction & txn, TableId revisions_table, TableId revisions_comments,
     	TableId snapshots_table, const RevisionClosure & revisions, const Path & rootStatePath, const string & comment);
     

src/libutil/util.cc

@@ -1295,15 +1295,15 @@ void symlinkPath(const Path & existingDir, const Path & newLinkName)	//TODO bool
 	*/
 	runProgram_AndPrintOutput("/bin/sh", true, p_args, "sh-ln");
 	
-	executeShellCommand("whoami");
+	//executeShellCommand("whoami");
-	executeShellCommand("pwd");
+	//executeShellCommand("pwd");
 	printMsg(lvlError, format("ln -sf %1% %2%") % existingDir % newLinkName);
 }
 
 void removeSymlink(const string & path)
 {
-	if(path[path.length() - 1] != '/')
+	if(path[path.length() - 1] == '/')
-		throw Error(format("We dont want to remove the enitre directory, only the symlink, but a / is given for `%1%'") % path);
+		throw Error(format("We dont want to remove the symlink, not the enitre directory, but a / is given for `%1%'") % path);
 	deletePath(path);
 }
 
@@ -1316,8 +1316,6 @@ void ensureStateDir(const Path & statePath, const string & user, const string &
 
 void copyContents(const Path & from, const Path & to)	//TODO bool shellexpansion, bool failure for nix-env
 {
-	//executeShellCommand("whoami");
-	
 	//TODO Could be a symlink (to a non-existing dir)
 	/*
 	if(!DirectoryExist(from))
@@ -1326,33 +1324,21 @@ void copyContents(const Path & from, const Path & to)	//TODO bool shellexpansion
 		throw Error(format("Path `%1%' doenst exist ...") % to);
 	*/
 	
-	//executeShellCommand("ls -l "+from);
+	//TODO do a Rsync instead of a cp.
-	//executeShellCommand("ls -l "+from+"/");
+	//rsync -avHx --delete from to
-	//executeShellCommand("ls -l "+to);
-	//executeShellCommand("ls -l "+to+"/");
 		
 	//Copy all files + dirs recursively
 	Strings p_args;
 	p_args.push_back("-c");				//we call the shell (/bin/sh -c) so it expands the * to all files
 	p_args.push_back("cp -R "+from + "/* "+to);
-	/*
-	p_args.push_back("cp");
-	p_args.push_back("-R");
-	p_args.push_back(from + "/*");
-	p_args.push_back(to);
-	*/
 	runProgram_AndPrintOutput("/bin/sh", true, p_args, "sh-cp");
 	
 	//Also copy the hidden files (but not the ../ dir)
 	p_args.empty();
 	p_args.push_back("-c");
 	p_args.push_back("cp " + from + "/.[a-zA-Z0-9]* " +to);
-	/*
-	p_args.push_back(cp");
-	p_args.push_back(from + "/.[a-zA-Z0-9]*");
-	p_args.push_back(to);
-	*/
 	runProgram_AndPrintOutput("/bin/sh", true, p_args, "sh-cp");
+	
 }
 
 }

src/nix-env/nix-env.cc

@@ -639,7 +639,7 @@ static void installDerivations(Globals & globals,
     			PathSet comparePaths;
     			comparePaths.insert(statePath);
     			comparePaths.insert(read_statePath);
-    			if(store->toNonSharedPathSet(comparePaths).size() != 1)			//TODO !!!!!!!!!!!!! only copy when not already a symlink to a statePath !!!!!!!!!
+    			if(store->toNonSharedPathSet(comparePaths).size() != 1)			//TODO !!!!!!!!!!!!!??
     				copyContents(externalState, statePath);
     		}
     		else

src/nix-state/help.txt

@@ -1,4 +1,4 @@
-Usage: nix-state [OPTIONS...] [ARGUMENTS...]
+Usage: nix-state [OPTIONS...] [ARGUMENTS...] [NIX Store/State-Path]
 
 `nix-state' is a tool to manipulate the Nix state-store and to run programs.
 
@@ -26,12 +26,13 @@ Information:
 Share state Operations:
 
   --unshare: unshare this path
-  --share-with a b: make the path a point to the path b
+  --share-with=a b: make the statepath b point to a
+  --copy-from=a b: make the contents of statepath b equal to the contents of a
 
 Share state Options:
 
-  --unshare-branch-state: 
+  --unshare-and-branch-state: 
-  --unshare-restore-old-state: 
+  --unshare-and-restore-old-state: (default)
  
 Revert state Operations:
 

src/nix-state/nix-state.cc

@@ -33,7 +33,9 @@ bool r_commit = true;
 bool r_run = true;
 bool revert_recursively = false;
 bool unshare_branch = false;
-bool unshare_restore_old = false;
+bool unshare_restoreOld = true;
+string share_with;
+string copy_from;
 
 
 /************************* Build time Functions ******************************/
@@ -267,12 +269,27 @@ static void opShowSharedPaths(Strings opFlags, Strings opArgs)
 
 static void opUnshare(Strings opFlags, Strings opArgs)
 {
+	Path statePath = *(opArgs.begin());
+	if(!store->isValidStatePath(statePath))
+		throw UsageError(format("Path '%1%' is not a valid state path.") % statePath);
 	
+	store->unShareState(statePath, unshare_branch, unshare_restoreOld);
 }
 
 static void opShareWith(Strings opFlags, Strings opArgs)
 {
+	Path statePath = *(opArgs.begin());
+	if(!store->isValidStatePath(statePath))
+		throw UsageError(format("Path '%1%' is not a valid state path.") % statePath);
 	
+	store->shareState(statePath, share_with, false);
+}
+
+static void opCopyFrom(Strings opFlags, Strings opArgs)
+{
+	//TODO !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+	//copy_from
+	throw UsageError(format("TODO !!!!!!!!!!!!"));
 }
 
 
@@ -307,10 +324,14 @@ static void opRunComponent(Strings opFlags, Strings opArgs)
     		if(*i == "--help" || *i == "--version"){
     			printMsg(lvlError, format("Usage: try --statehelp for extended state help options"));
     			printMsg(lvlError, format("%1%") % padd("", '-', 54));
+    			r_scanforReferences = false;
+    			r_commit = false;
     		}
     		else if(*i == "--statehelp"){
     			printMsg(lvlError, format("%1%") % padd("", '-', 100));
     			printHelp();
+    			r_scanforReferences = false;
+    			r_commit = false;
     		}
     		
     		//printMsg(lvlError, format("ARG %1%") % *i);
@@ -555,6 +576,11 @@ void run(Strings args)
 
 	/* test */
 	
+	if(args.size() == 1 && ( *(args.begin()) == "--help" || *(args.begin()) == "--statehelp")){
+		printHelp();
+		return;	
+	}
+	
     for (Strings::iterator i = args.begin(); i != args.end(); ) {
         string arg = *i++;
 
@@ -612,17 +638,23 @@ void run(Strings args)
 			op = opShowSharedPaths;
 		else if (arg == "--unshare")
 			op = opUnshare;
-		else if (arg == "--unshare-branch-state")
+		else if (arg == "--unshare-and-branch-state")
 			unshare_branch = true;
-		else if (arg == "--unshare-restore-old-state")
+		else if (arg == "--unshare-and-restore-old-state")		//default true
-			unshare_restore_old = true;
+			unshare_restoreOld = true;
-		else if (arg == "--share-with")
+		else if (arg.substr(0,13) == "--share-with="){
 			op = opShareWith;
+			share_with = arg.substr(13,arg.length());
+		}
+		else if (arg.substr(0,12) == "--copy-from="){
+			op = opCopyFrom;
+			copy_from = arg.substr(12,arg.length());
+		}
 		
 	    /*
-		--share-from
 		
-		--unshare
+		--copy-from
+		
 		*/
 	
 	

src/nix-worker/nix-worker.cc

@@ -615,9 +615,10 @@ static void performOp(Source & from, Sink & to, unsigned int op)
 	
 	case wopUnShareState: {
 		Path path = readString(from);
-		bool copyFromOld = readInt(from) == 1;
+		bool branch = readInt(from) == 1;
+		bool restoreOld = readInt(from) == 1;
 		startWork();
-    	store->unShareState(path, copyFromOld);
+    	store->unShareState(path, branch, restoreOld);
     	stopWork();
     	writeInt(1, to);
 		break;