Sync disks to prevent file corruption when users power-cycle their Pi…

… Zeros soon after upload

Saw a few corrupted autostart files in the last weeks, which should be fixed by this.

resources/build.properties

@@ -134,12 +134,12 @@ source.repository=https://github.com/gohai/processing-uploadtopi.git
 # This is used to compare different versions of the same Tool, and check if an 
 # update is available.
 
-tool.version=3
+tool.version=4
 
 
 # The version as the user will see it. 
 
-tool.prettyVersion=1.0.2
+tool.prettyVersion=1.0.3
 
 
 # The min and max revision of Processing compatible with your Tool.

src/gohai/uploadtopi/UploadToPiTool.java

@@ -180,7 +180,17 @@ public void run() {
           return;
         }
 
-        // XXX: sync since users might be inclined to power-cyle the Pi the hard way?
+        try {
+          editor.statusNotice("Syncing disks ...");
+          syncDisks();
+        } catch (Exception e) {
+          editor.statusError("Cannot sync disks");
+          // DEBUG
+          e.printStackTrace();
+          System.err.println(e);
+          disconnect();
+          return;
+        }
 
         editor.statusNotice("Running " + sketchName + " on the Raspberry Pi");
         try {
@@ -407,6 +417,18 @@ public void stopSketches() throws IOException {
   }
 
 
+  public void syncDisks() throws IOException {
+    Session session = ssh.startSession();
+    Command cmd = session.exec("sync");
+    cmd.join(3, TimeUnit.SECONDS);
+    if (cmd.getExitStatus() != 0) {
+      // not critical
+      System.err.println("Error syncing disks. Make sure you power off the Pi safely to prevent file corruption.");
+    }
+    session.close();
+  }
+
+
   public void uploadSketch(String localDir, String dest, String sketchName) throws IOException {
     SFTPClient sftp = ssh.newSFTPClient();
     // XXX: only upload changed files?