Use OS.File.move() for data-dir migration on Windows, and make automatic

Previously on Windows, where we don't have /bin/mv, we were recursing
into the data directory and copying files individually, which is very
slow, so automatic migration was disabled. Instead, try moving
directories with OS.File.move() with the `noCopy` flag. Moving
directories is technically unsupported by OS.File, but probably only
because of the possibility of a cross-volume copy (which is only
implemented for some platforms), and using `noCopy` hopefully prevents
that. If someone does have their data directory or storage directory on
a different volume, the migration might be quite slow, but leaving a
data directory behind in the Firefox profile directory (where it can be
easily misplaced with a seemingly unrelated Firefox reset) is worse.

chrome/content/zotero/xpcom/dataDirectory.js

@@ -484,14 +484,7 @@ Zotero.DataDirectory = {
 		}
 		let automatic = false;
 		if (!exists) {
-			// Migrate automatically on macOS and Linux -- this should match the check in
-			// Zotero.File.moveDirectory()
-			if (!Zotero.isWin && (yield OS.File.exists("/bin/mv"))) {
-				automatic = true;
-			}
-			else {
-				return false;
-			}
+			automatic = true;
 			
 			// Skip automatic migration if there's a non-empty directory at the new location
 			if ((yield OS.File.exists(newDir)) && !(yield Zotero.File.directoryIsEmpty(newDir))) {

chrome/content/zotero/xpcom/file.js

@@ -497,11 +497,18 @@ Zotero.File = new function(){
 	 *
 	 * Currently this means using /bin/mv, which only works on macOS and Linux
 	 */
-	this.canMoveDirectoryAtomic = Zotero.lazy(function () {
+	this.canMoveDirectoryWithCommand = Zotero.lazy(function () {
 		var cmd = "/bin/mv";
 		return !Zotero.isWin && this.pathToFile(cmd).exists();
 	});
 	
+	/**
+	 * For tests
+	 */
+	this.canMoveDirectoryWithFunction = Zotero.lazy(function () {
+		return true;
+	});
+	
 	/**
 	 * Move directory (using mv on macOS/Linux, recursively on Windows)
 	 *
@@ -513,7 +520,8 @@ Zotero.File = new function(){
 	this.moveDirectory = Zotero.Promise.coroutine(function* (oldDir, newDir, options = {}) {
 		var maxDepth = options.maxDepth || 10;
 		var cmd = "/bin/mv";
-		var useCmd = this.canMoveDirectoryAtomic();
+		var useCmd = this.canMoveDirectoryWithCommand();
+		var useFunction = this.canMoveDirectoryWithFunction();
 		
 		if (!options.allowExistingTarget && (yield OS.File.exists(newDir))) {
 			throw new Error(newDir + " exists");
@@ -591,6 +599,7 @@ Zotero.File = new function(){
 						let moved = false;
 						
 						if (useCmd && !(yield OS.File.exists(dest))) {
+							Zotero.debug(`Moving ${entry.path} with ${cmd}`);
 							let args = [entry.path, dest];
 							try {
 								yield Zotero.Utilities.Internal.exec(cmd, args);
@@ -598,7 +607,29 @@ Zotero.File = new function(){
 							}
 							catch (e) {
 								checkError(e);
-								addError(e);
+								Zotero.debug(e, 1);
+							}
+						}
+						
+						
+						// If can't use command, try moving with OS.File.move(). Technically this is
+						// unsupported for directories, but it works on all platforms as long as noCopy
+						// is set (and on some platforms regardless)
+						if (!moved && useFunction) {
+							Zotero.debug(`Moving ${entry.path} with OS.File`);
+							try {
+								yield OS.File.move(
+									entry.path,
+									dest,
+									{
+										noCopy: true
+									}
+								);
+								moved = true;
+							}
+							catch (e) {
+								checkError(e);
+								Zotero.debug(e, 1);
 							}
 						}
 						

test/tests/dataDirectoryTest.js

@@ -59,19 +59,33 @@ describe("Zotero.DataDirectory", function () {
 		stubs.pipeExists.restore();
 	});
 	
+	// Force non-mv mode
 	var disableCommandMode = function () {
-		// Force non-mv mode
-		var origFunc = OS.File.exists;
-		if (!stubs.canMoveDirectoryAtomic) {
-			stubs.canMoveDirectoryAtomic = sinon.stub(Zotero.File, "canMoveDirectoryAtomic")
+		if (!stubs.canMoveDirectoryWithCommand) {
+			stubs.canMoveDirectoryWithCommand = sinon.stub(Zotero.File, "canMoveDirectoryWithCommand")
+				.returns(false);
+		}
+	};
+	
+	// Force non-OS.File.move() mode
+	var disableFunctionMode = function () {
+		if (!stubs.canMoveDirectoryWithFunction) {
+			stubs.canMoveDirectoryWithFunction = sinon.stub(Zotero.File, "canMoveDirectoryWithFunction")
 				.returns(false);
 		}
 	};
 	
 	var resetCommandMode = function () {
-		if (stubs.canMoveDirectoryAtomic) {
-			stubs.canMoveDirectoryAtomic.restore();
-			stubs.canMoveDirectoryAtomic = undefined;
+		if (stubs.canMoveDirectoryWithCommand) {
+			stubs.canMoveDirectoryWithCommand.restore();
+			stubs.canMoveDirectoryWithCommand = undefined;
+		}
+	};
+	
+	var resetFunctionMode = function () {
+		if (stubs.canMoveDirectoryWithFunction) {
+			stubs.canMoveDirectoryWithFunction.restore();
+			stubs.canMoveDirectoryWithFunction = undefined;
 		}
 	};
 	
@@ -144,10 +158,12 @@ describe("Zotero.DataDirectory", function () {
 		
 		beforeEach(function () {
 			disableCommandMode();
+			disableFunctionMode();
 		});
 		
 		after(function () {
 			resetCommandMode();
+			resetFunctionMode();
 		});
 		
 		var tests = [];
@@ -157,11 +173,7 @@ describe("Zotero.DataDirectory", function () {
 		
 		it("should skip automatic migration if target directory exists and is non-empty", function* () {
 			resetCommandMode();
-			
-			// No automatic migration without atomic directory move
-			if (!Zotero.File.canMoveDirectoryAtomic()) {
-				this.skip();
-			}
+			resetFunctionMode();
 			
 			yield populateDataDirectory(oldDir);
 			yield OS.File.remove(oldMigrationMarker);
@@ -347,10 +359,12 @@ describe("Zotero.DataDirectory", function () {
 			
 			before(function () {
 				disableCommandMode();
+				disableFunctionMode();
 			});
 			
 			after(function () {
 				resetCommandMode();
+				resetFunctionMode();
 			});
 			
 			it("should handle partial failure", function* () {