I think that might be a working UpdatePostProcessor, now to figure out how to register it

Makefile

@@ -37,6 +37,7 @@ src/I2P/config:
 
 build/I2P/config: build/I2P
 	cp -rv src/I2P/config build/I2P/config ; true
+	cp -rv src/I2P/config build/I2P/.i2p ; true
 
 #
 # Warning: a displayed license file of more than 28752 bytes
@@ -61,7 +62,7 @@ profile: build/profile/user.js build/profile/prefs.js build/profile/bookmarks.ht
 profile.tgz: profile
 	$(eval PROFILE_VERSION := $(shell cat src/profile/version.txt))
 	@echo "building profile tarball $(PROFILE_VERSION)"
-	bash -c 'ls I2P && cp -rv I2P build/profile/I2P'; true
+	bash -c 'ls I2P && cp -rv build/I2P build/profile/I2P'; true
 	install -m755 src/unix/i2pbrowser.sh build/profile/i2pbrowser.sh
 	cd build && tar -czf profile-$(PROFILE_VERSION).tgz profile && cp profile-$(PROFILE_VERSION).tgz ../
 
@@ -87,7 +88,7 @@ app-profile: build/app-profile/user.js build/app-profile/prefs.js build/app-prof
 app-profile.tgz: app-profile
 	$(eval PROFILE_VERSION := $(shell cat src/app-profile/version.txt))
 	@echo "building app-profile tarball $(PROFILE_VERSION)"
-	bash -c 'ls I2P && cp -rv I2P build/app-profile/I2P'; true
+	bash -c 'ls I2P && cp -rv build/I2P build/app-profile/I2P'; true
 	install -m755 src/unix/i2pconfig.sh build/app-profile/i2pconfig.sh
 	cd build && tar -czf app-profile-$(PROFILE_VERSION).tgz app-profile && cp app-profile-$(PROFILE_VERSION).tgz ../
 

build.sh

@@ -22,7 +22,7 @@ echo "cleaning"
 HERE="$PWD"
 cd "$HERE/../i2p.i2p/"
 git checkout "$VERSION"
-#ant distclean pkg || true
+ant distclean pkg || true
 
 cd "$HERE"
 RES_DIR="$HERE/../i2p.i2p/installer/resources"

i2pversion

@@ -1,13 +1,15 @@
 #! /usr/bin/env sh
 
+
+#Comment this out to build from an alternate branch or
+# the tip of the master branch.
 #I2P_VERSION=0.9.50
 #export I2P_VERSION=0.9.50
-
 #VERSION=i2p-$I2P_VERSION
 #export VERSION="$VERSION"
 
+#Uncomment this to build from the tip of the master.
 I2P_VERSION=master
 export I2P_VERSION=master
-
 VERSION=$I2P_VERSION
 export VERSION="$VERSION"

java/net/i2p/router/WindowsUpdatePostProcessor.java

@@ -13,7 +13,6 @@ import java.lang.InterruptedException;
 
 public class WindowsUpdatePostProcessor {
     protected static Router i2pRouter = null;
-    Process updateProcess = null;
     public void updateDownloadedandVerified(UpdateType type, int fileType, String version, File file) throws IOException {
         if (fileType == 6) {
             if (runUpdate(file)) {
@@ -23,32 +22,35 @@ public class WindowsUpdatePostProcessor {
             }
         }
     }
+
     private boolean runUpdate(File file){
-            ProcessBuilder pb = new ProcessBuilder("cmd", "/c", file.getAbsolutePath());
+        Process updateProcess = null;
-            try {
+        ProcessBuilder pb = new ProcessBuilder("cmd", "/c", file.getAbsolutePath());
-                updateProcess = pb.start();
+        try {
-            } catch (IOException ex) {
+            updateProcess = pb.start();
-                // At this point a failure is harmless, but it's also not at all important to
+        } catch (IOException ex) {
-                // restart the router. Return false.
+           // At this point a failure is harmless, but it's also not at all important to
-                return false;
+           // restart the router. Return false.
-            }
+            return false;
-            try {
+        }
-                updateProcess.waitFor();
+        try {
-            } catch (InterruptedException ex) {
+            updateProcess.waitFor();
-                // if the NSIS installer process got interrupted here, it's possible that the
+        } catch (InterruptedException ex) {
-                // install was left in a broken state. I think we should direct the uses to
+            // if the NSIS installer process got interrupted here, it's possible that the
-                // re-run the installer if this happens. TODO: java dialog boxes. That should be
+            // install was left in a broken state. I think we should direct the uses to
-                // easy.
+            // re-run the installer if this happens. TODO: java dialog boxes. That should be
-                return false;
+            // easy.
-            }
+            return false;
-            return true;
+        }
+        return true;
     }
+
     private boolean shutdownGracefullyAndRerun() {
         i2pRouter.shutdownGracefully();
         ProcessBuilder pb = new ProcessBuilder("cmd", "/c", selectProgramFile().getAbsolutePath());
         while (i2pRouter.gracefulShutdownInProgress()){
         }
-        if (i2pRouter.isFinalShutdownInProgress()){
+        if (i2pRouter.isFinalShutdownInProgress()) {
             try {
                 Process restartProcess = pb.start();
             } catch (IOException ex) {
@@ -72,4 +74,15 @@ public class WindowsUpdatePostProcessor {
         }
     }
 
+    protected static File selectProgramFileExe() {
+	File pfpath = selectProgramFile();
+        if (SystemVersion.isWindows()) {
+            File app = new File(pfpath, "I2P.exe");
+            return app.getAbsoluteFile();
+        } else {
+            File app = new File(pfpath, "bin/I2P");
+            return app.getAbsoluteFile();
+        }
+    }
+
 }