* i2prouter:

- Don't cd to script location, no longer required
    * RouterLaunch:
      - If no wrapper, put wrapper.log in system temp dir
        unless specified with -Dwrapper.logfile=/path/to/wrapper.log
        or it already exists in CWD (for backward compatibility)
      - Append rather than replace wrapper.log
      - Pass wrapper log location to router as a property, so that logs.jsp can find it
    * logs.jsp:
      - Get wrapper log location from a property too
    * runplain.sh:
      - Add path substitution to runplain.sh on install
      - Pass I2P base dir to the router as a property
    * wrapper.config:
      - Put wrapper.log in system temp dir for new installs
      - Pass I2P base dir to the router as a property
    * WorkingDir:
      - Don't migrate an existing install by default
      - Never migrate the data (too hard)

router/java/src/net/i2p/router/RouterLaunch.java

@@ -1,13 +1,39 @@
 package net.i2p.router;
 
+import java.io.File;
 import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.PrintStream;
 
+/**
+ *  This is the class called by the runplain.sh script on linux
+ *  and the i2p.exe launcher on Windows.
+ *  (i.e. no wrapper)
+ *
+ *  If there is no -Dwrapper.log=/path/to/wrapper.log on the java command line
+ *  to specify a log file, check for existence of wrapper.log in CWD,
+ *  for backward compatibility in old installations (don't move it).
+ *  Otherwise, use (system temp dir)/wrapper.log.
+ *  Create if it doesn't exist, and append to it if it does.
+ *  Put the location in the environment as an absolute path, so logs.jsp can find it.
+ */
 public class RouterLaunch {
+    private static final String PROP_WRAPPER_LOG = "wrapper.logfile";
+    private static final String DEFAULT_WRAPPER_LOG = "wrapper.log";
+
     public static void main(String args[]) {
+        String path = System.getProperty(PROP_WRAPPER_LOG);
+        File logfile;
+        if (path != null) {
+            logfile = new File(path);
+        } else {
+            logfile = new File(DEFAULT_WRAPPER_LOG);
+            if (!logfile.exists())
+                logfile = new File(System.getProperty("java.io.tmpdir"), DEFAULT_WRAPPER_LOG);
+        }
+        System.setProperty(PROP_WRAPPER_LOG, logfile.getAbsolutePath());
         try {
-            System.setOut(new PrintStream(new FileOutputStream("wrapper.log")));
+            System.setOut(new PrintStream(new FileOutputStream(logfile, true)));
         } catch (IOException ioe) {
             ioe.printStackTrace();
 	}