added a default logging location, if logPath property is not set.

main/ui/src/main/java/org/cryptomator/ui/logging/HomeDirectoryAwareFileAppender.java

@@ -18,32 +18,45 @@ import org.apache.logging.log4j.core.config.plugins.PluginAttribute;
 import org.apache.logging.log4j.core.config.plugins.PluginElement;
 import org.apache.logging.log4j.core.config.plugins.PluginFactory;
 import org.apache.logging.log4j.core.layout.PatternLayout;
+import org.apache.logging.log4j.util.Strings;
 
-@Plugin(name = "HomeDirectoryAwareFile", category = "Core", elementType = "appender", printObject = true)
-public class HomeDirectoryAwareFileAppender extends AbstractOutputStreamAppender<FileManager> {
+/**
+ * A preconfigured FileAppender only relying on a configurable system property, e.g. <code>-DlogPath=/var/log/cryptomator.log</code>.<br/>
+ * Other than the normal {@link org.apache.logging.log4j.core.appender.FileAppender} paths can be resolved relative to the users home directory.
+ */
+@Plugin(name = "ConfigurableFile", category = "Core", elementType = "appender", printObject = true)
+public class ConfigurableFileAppender extends AbstractOutputStreamAppender<FileManager> {
 
 	private static final long serialVersionUID = -6548221568069606389L;
 	private static final int DEFAULT_BUFFER_SIZE = 8192;
+	private static final String DEFAULT_FILE_NAME = "cryptomator.log";
 
-	protected HomeDirectoryAwareFileAppender(String name, Layout<? extends Serializable> layout, Filter filter, FileManager manager) {
+	protected ConfigurableFileAppender(String name, Layout<? extends Serializable> layout, Filter filter, FileManager manager) {
 		super(name, layout, filter, true, true, manager);
-		LOGGER.warn("Logging to " + manager.getFileName());
+		LOGGER.info("Logging to " + manager.getFileName());
 	}
 
 	@PluginFactory
-	public static HomeDirectoryAwareFileAppender createAppender(@PluginAttribute("name") final String name, @PluginAttribute("fileName") final String fileName,
+	public static ConfigurableFileAppender createAppender(@PluginAttribute("name") final String name, @PluginAttribute("pathPropertyName") final String pathPropertyName,
 			@PluginElement("Layout") Layout<? extends Serializable> layout) {
 
 		if (name == null) {
-			LOGGER.error("No name provided for FileAppender");
+			LOGGER.error("No name provided for HomeDirectoryAwareFileAppender");
 			return null;
 		}
 
-		final Path filePath;
-		if (fileName == null) {
-			LOGGER.error("No filename provided for FileAppender with name " + name);
+		if (pathPropertyName == null) {
+			LOGGER.error("No pathPropertyName provided for HomeDirectoryAwareFileAppender with name " + name);
 			return null;
-		} else if (fileName.startsWith("~/")) {
+		}
+
+		String fileName = System.getProperty(pathPropertyName);
+		if (Strings.isEmpty(fileName)) {
+			fileName = DEFAULT_FILE_NAME;
+		}
+
+		final Path filePath;
+		if (fileName.startsWith("~/")) {
 			// home-dir-relative Path:
 			final Path userHome = FileSystems.getDefault().getPath(SystemUtils.USER_HOME);
 			filePath = userHome.resolve(fileName.substring(2));
@@ -53,7 +66,7 @@ public class HomeDirectoryAwareFileAppender extends AbstractOutputStreamAppender
 		} else {
 			// relative Path:
 			try {
-				final URI jarFileLocation = HomeDirectoryAwareFileAppender.class.getProtectionDomain().getCodeSource().getLocation().toURI();
+				final URI jarFileLocation = ConfigurableFileAppender.class.getProtectionDomain().getCodeSource().getLocation().toURI();
 				final Path workingDir = FileSystems.getDefault().getPath(jarFileLocation.getPath()).getParent();
 				filePath = workingDir.resolve(fileName);
 			} catch (URISyntaxException e) {
@@ -76,7 +89,7 @@ public class HomeDirectoryAwareFileAppender extends AbstractOutputStreamAppender
 		}
 
 		final FileManager manager = FileManager.getFileManager(filePath.toString(), false, false, true, null, layout, DEFAULT_BUFFER_SIZE);
-		return new HomeDirectoryAwareFileAppender(name, layout, null, manager);
+		return new ConfigurableFileAppender(name, layout, null, manager);
 	}
 
 }

main/ui/src/main/resources/log4j2.xml

@@ -18,9 +18,10 @@
 			<PatternLayout pattern="%16d %-5p [%c{1}:%L] %m%n" />
 			<ThresholdFilter level="WARN" onMatch="ACCEPT" onMismatch="DENY" />
 		</Console>
-		<HomeDirectoryAwareFile name="File" fileName="${sys:logPath}">
+		<!-- <File fileName="${sys:logPath}" ...> not feasible for paths like ~/foo/bar -->
+		<ConfigurableFile name="File" pathPropertyName="logPath">
 			<PatternLayout pattern="%16d %-5p [%c{1}:%L] %m%n" />
-		</HomeDirectoryAwareFile>
+		</ConfigurableFile>
 	</Appenders>
 
 	<Loggers>