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• SVN: Working with branches using the same working copy

  - by uXuf

  We've just moved to SVN from CVS. We have a small team and everyone checks in code on the trunk and we have never ever used branches for development. We each have directories on a remote dev server with the codebase checked out. Each developer works on their own sandbox with an associated URL to pull up the app in a browser (something like the setup here: Trade-offs of local vs remote development workflows for a web development team). I've decided that for my current project, I'll use a branch because it would span multiple releases. I've already cut a branch out, but I am using the same directory as the one originally checked out (i.e. for the trunk). Since it's the same directory (or working copy) for both the branch and the trunk, if for e.g. a bug pops up in the app I switch to the trunk and commit the change there, and then switch back to my branch for my project development. My questions are: Is this a sane way to work with branches? Are there any pitfalls that I need to be aware of? What would be the optimal way to work with branches if separate working copies are out of the question? I haven't had issues yet as I have just started doing this way but all the tutorials/books/blog posts I have seen about branching with SVN imply working with different working copies (or perhaps I haven't come across an explanation of mixed working copies in plain English). I just don't want to be sorry three months down the road when its time to integrate the branch back to the trunk.

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• Video Recording Not Working in ICS

  - by Nirav Ranpara

  I have implement code Record video in Android Phone . This code is working in 2.2 , 2.3 . not in ICS But when I checked in ICS code is not working ? here I posted code and xml file. videorecord.java import java.io.File; import java.io.IOException; import android.app.Activity; import android.app.AlertDialog; import android.content.Context; import android.content.DialogInterface; import android.content.Intent; import android.content.SharedPreferences; import android.hardware.Camera; import android.media.CamcorderProfile; import android.media.MediaRecorder; import android.os.Bundle; import android.os.CountDownTimer; import android.os.Environment; import android.util.Log; import android.view.Display; import android.view.KeyEvent; import android.view.SurfaceHolder; import android.view.SurfaceView; import android.view.View; import android.widget.EditText; import android.widget.FrameLayout; import android.widget.ImageView; import android.widget.LinearLayout; import android.widget.TextView; import android.widget.Toast; public class videorecord extends Activity{ SharedPreferences.Editor pre; String filename; CountDownTimer t; private Camera myCamera; private MyCameraSurfaceView myCameraSurfaceView; private MediaRecorder mediaRecorder; Integer cnt=0; LinearLayout myButton; TextView myButton1; SurfaceHolder surfaceHolder; boolean recording; private TextView txtcount; private ImageView btnplay; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); recording = false; setContentView(R.layout.videorecord); init(); myCamera = getCameraInstance(); if(myCamera == null){ } myCameraSurfaceView = new MyCameraSurfaceView(this, myCamera); FrameLayout myCameraPreview = (FrameLayout)findViewById(R.id.videoview); Display display = getWindowManager().getDefaultDisplay(); int width = display.getWidth(); int height = display.getHeight(); myCameraSurfaceView.setLayoutParams(new LinearLayout.LayoutParams(width, height-60)); myCameraPreview.addView(myCameraSurfaceView); myButton = (LinearLayout)findViewById(R.id.mybutton); btnplay.setOnClickListener(myButtonOnClickListener); } private void init() { txtcount = (TextView) findViewById(R.id.txtcounter); //myButton1 = (TextView) findViewById(R.id.mybutton1); btnplay = (ImageView)findViewById(R.id.btnplay); t = new CountDownTimer( Long.MAX_VALUE , 1000) { @Override public void onTick(long millisUntilFinished) { cnt++; String time = new Integer(cnt).toString(); long millis = cnt; int seconds = (int) (millis / 60); int minutes = seconds / 60; seconds = seconds % 60; txtcount.setText(String.format("%d:%02d:%02d", minutes, seconds,millis)); } @Override public void onFinish() { } }; } @Override public boolean onKeyDown(int keyCode, KeyEvent event) { if ((keyCode == KeyEvent.KEYCODE_BACK)) { if(recording) { new AlertDialog.Builder(videorecord.this).setTitle("Do you want to save Video ?") .setPositiveButton("OK", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int which) { filename(); //finish(); } }).setNegativeButton("Cancle", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int which) { // TODO Auto-generated method stub } }).show(); } else { if ((keyCode == KeyEvent.KEYCODE_BACK)) { //Intent homeIntent= new Intent(Intent.ACTION_MAIN); //homeIntent.addCategory(Intent.CATEGORY_HOME); //homeIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); //startActivity(homeIntent); //this.finishActivity(1); finish(); } //moveTaskToBack(true); // finish(); return super.onKeyDown(keyCode, event); } } else { // Toast.makeText(getApplicationContext(), "asd", Toast.LENGTH_LONG).show(); android.os.Process.killProcess(android.os.Process.myPid()) ; } return super.onKeyDown(keyCode, event); } ImageView.OnClickListener myButtonOnClickListener = new ImageView.OnClickListener(){ public void onClick(View v) { if(recording){ Log.e("Record error", "error in recording ."); mediaRecorder.stop(); t.cancel(); filename(); releaseMediaRecorder(); }else{ releaseCamera(); Log.e("Record Stop error", "error in recording ."); // if(!prepareMediaRecorder()){ prepareMediaRecorder(); finish(); } mediaRecorder.start(); recording = true; // myButton1.setText("STOP Recording"); // btnplay.setImageResource(android.R.drawable.ic_media_pause); btnplay.setImageResource(R.drawable.stoprec); t.start(); } }}; private Camera getCameraInstance(){ Camera c = null; try { c = Camera.open(); } catch (Exception e){ } return c; } private void filename() { AlertDialog.Builder alert = new AlertDialog.Builder(this); alert.setTitle("Save Video"); alert.setMessage("Enter File Name"); final EditText input = new EditText(this); alert.setView(input); alert.setPositiveButton("Ok", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int whichButton) { if(input.getText().length()>=1) { filename = input.getText().toString(); File sdcard = new File(Environment.getExternalStorageDirectory() + "/VideoRecord"); File from = new File(sdcard,"null.mp4"); File to = new File(sdcard,filename+".mp4"); from.renameTo(to); SharedPreferences sp = videorecord.this.getSharedPreferences("data", MODE_WORLD_WRITEABLE); pre = sp.edit(); pre.clear(); pre.commit(); pre.putString("lastvideo", filename+".mp4"); pre.commit(); //btnplay.setImageResource(android.R.drawable.ic_media_play); btnplay.setImageResource(R.drawable.startrec); // Intent intent = new Intent(videorecord.this,StopVidoWatch_Activity.class); // startActivity(intent); Intent myIntent = new Intent(getApplicationContext(), StopVidoWatch_Activity.class).setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); startActivity(myIntent); } else { filename(); } } }); alert.setNegativeButton("Cancel", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int whichButton) { // Intent intent = new Intent(videorecord.this,StopVidoWatch_Activity.class); // startActivity(intent); File file = new File(Environment.getExternalStorageDirectory() + "/VideoRecord/null.mp4"); //boolean deleted = file.delete(); file.delete(); finish(); } }); alert.show(); } private boolean prepareMediaRecorder(){ myCamera = getCameraInstance(); mediaRecorder = new MediaRecorder(); myCamera.unlock(); mediaRecorder.setCamera(myCamera); mediaRecorder.setAudioSource(MediaRecorder.AudioSource.CAMCORDER); mediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA); mediaRecorder.setProfile(CamcorderProfile.get(CamcorderProfile.QUALITY_HIGH)); File folder = new File(Environment.getExternalStorageDirectory() + "/VideoRecord"); boolean success = false; if (!folder.exists()) { success = folder.mkdir(); } if (!success) { } else { } mediaRecorder.setOutputFile("/sdcard/VideoRecord/"+filename+".mp4"); mediaRecorder.setMaxDuration(60000); mediaRecorder.setMaxFileSize(5000000); Display display = getWindowManager().getDefaultDisplay(); int width = display.getHeight(); int height = display.getWidth(); String s = new String(); s= s.valueOf(width); String s1 = new String(); s1= s1.valueOf(height); // Toast.makeText(videorecord.this, "Width : " + s , Toast.LENGTH_LONG).show(); // Toast.makeText(videorecord.this, "Height : " + s1 , Toast.LENGTH_LONG).show(); mediaRecorder.setVideoSize(height, width); mediaRecorder.setPreviewDisplay(myCameraSurfaceView.getHolder().getSurface()); try { mediaRecorder.prepare(); } catch (IllegalStateException e) { releaseMediaRecorder(); return false; } catch (IOException e) { releaseMediaRecorder(); return false; } return true; } @Override protected void onPause() { super.onPause(); releaseMediaRecorder(); releaseCamera(); } private void releaseMediaRecorder() { if (mediaRecorder != null) { mediaRecorder.reset(); mediaRecorder.release(); mediaRecorder = null; myCamera.lock(); } } private void releaseCamera(){ if (myCamera != null){ myCamera.release(); myCamera = null; } } public class MyCameraSurfaceView extends SurfaceView implements SurfaceHolder.Callback{ private SurfaceHolder mHolder; private Camera mCamera; public MyCameraSurfaceView(Context context, Camera camera) { super(context); mCamera = camera; mHolder = getHolder(); mHolder.addCallback(this); mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); } public void surfaceChanged(SurfaceHolder holder, int format, int weight, int height) { if (mHolder.getSurface() == null){ return; } try { mCamera.stopPreview(); } catch (Exception e){ } try { mCamera.setPreviewDisplay(mHolder); mCamera.startPreview(); } catch (Exception e){ } } public void surfaceCreated(SurfaceHolder holder) { try { mCamera.setPreviewDisplay(holder); mCamera.startPreview(); } catch (IOException e) { } } public void surfaceDestroyed(SurfaceHolder holder) { } } } videorecord.xml <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" > <FrameLayout android:layout_width="fill_parent" android:layout_height="fill_parent" > <FrameLayout android:id="@+id/videoview" android:layout_width="fill_parent" android:layout_height="fill_parent"></FrameLayout> <LinearLayout android:id="@+id/mybutton" android:layout_width="fill_parent" android:layout_marginBottom="0dip" android:layout_height="wrap_content" android:orientation="horizontal" android:layout_weight="0" > <!-- <TextView android:text="START Recording" android:id="@+id/mybutton1" android:layout_height="wrap_content" android:layout_width="wrap_content" style="@style/savestyle" android:layout_weight="1" android:gravity="left" > </TextView> --> <ImageView android:layout_height="wrap_content" android:id="@+id/btnplay" android:padding="5dip" android:background="#A0000000" android:textColor="#ffffffff" android:layout_width="wrap_content" android:src="@drawable/startrec" /> </LinearLayout> <TextView android:text="00:00:00" android:id="@+id/txtcounter" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="right|bottom" android:padding="5dip" android:background="#A0000000" android:textColor="#ffffffff" /> </FrameLayout> <RelativeLayout android:layout_width="fill_parent" android:layout_height="fill_parent" android:background="@color/bgcolor" > <LinearLayout android:layout_above="@+id/mybutton" android:orientation="horizontal" android:layout_width="fill_parent" android:layout_height="fill_parent" > </LinearLayout> </RelativeLayout> </LinearLayout>

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• SQL SERVER – Difference Between ROLLBACK IMMEDIATE and WITH NO_WAIT during ALTER DATABASE

  - by pinaldave

  Today, we are going to discuss about something very simple, but quite commonly confused two options of ALTER DATABASE. The first one is ALTER DATABASE …ROLLBACK IMMEDIATE and the second one is WITH NO_WAIT. Many people think they are the same or are not sure of the difference between these two options. Before we continue our explaination, let us go through the explanation given by Book On Line. ROLLBACK AFTER integer [SECONDS] | ROLLBACK IMMEDIATE Specifies whether to roll back after a specified number of seconds or immediately. NO_WAIT Specifies that if the requested database state or option change cannot complete immediately without waiting for transactions to commit or roll back on their own, then the request will fail. If you have understood the difference by now, there is no need to proceed further. If you are still confused, continue with the rest of the post. There is one big difference between ROLLBACK and NO_WAIT. In case incomplete Transaction ALTER DATABASE … ROLLBACK rollbacks those incomplete transaction immediately, where as ALTER DATABASE … NO_WAIT will terminate and rollback the transaction of ALTER DATABASE … NO_WAIT itself. I think it can be clearly explained with the help of the following images. Option 1: ALTER DATABASE … ROLLBACK Connection 1 – Simulating some operation using WAITFOR DELAY WAITFOR DELAY '1:00:00' Connection 2 ALTER DATABASE TestDb SET SINGLE_USER WITH ROLLBACK IMMEDIATE; Option 2: ALTER DATABASE … NO_WAIT Connection 1 – Simulating some operation using WAITFOR DELAY WAITFOR DELAY '1:00:00' Connection 2 ALTER DATABASE TestDb SET SINGLE_USER WITH NO_WAIT; Let me know if this example was simple enough. Reference : Pinal Dave (http://blog.SQLAuthority.com) Filed under: Pinal Dave, SQL, SQL Authority, SQL Documentation, SQL Query, SQL Scripts, SQL Server, SQL Tips and Tricks, T SQL, Technology

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• SQL SERVER – Concurrency Basics – Guest Post by Vinod Kumar

  - by pinaldave

  This guest post is by Vinod Kumar. Vinod Kumar has worked with SQL Server extensively since joining the industry over a decade ago. Working on various versions from SQL Server 7.0, Oracle 7.3 and other database technologies – he now works with the Microsoft Technology Center (MTC) as a Technology Architect. Let us read the blog post in Vinod’s own voice. Learning is always fun when it comes to SQL Server and learning the basics again can be more fun. I did write about Transaction Logs and recovery over my blogs and the concept of simplifying the basics is a challenge. In the real world we always see checks and queues for a process – say railway reservation, banks, customer supports etc there is a process of line and queue to facilitate everyone. Shorter the queue higher is the efficiency of system (a.k.a higher is the concurrency). Every database does implement this using checks like locking, blocking mechanisms and they implement the standards in a way to facilitate higher concurrency. In this post, let us talk about the topic of Concurrency and what are the various aspects that one needs to know about concurrency inside SQL Server. Let us learn the concepts as one-liners: Concurrency can be defined as the ability of multiple processes to access or change shared data at the same time. The greater the number of concurrent user processes that can be active without interfering with each other, the greater the concurrency of the database system. Concurrency is reduced when a process that is changing data prevents other processes from reading that data or when a process that is reading data prevents other processes from changing that data. Concurrency is also affected when multiple processes are attempting to change the same data simultaneously. Two approaches to managing concurrent data access: Optimistic Concurrency Model Pessimistic Concurrency Model Concurrency Models Pessimistic Concurrency Default behavior: acquire locks to block access to data that another process is using. Assumes that enough data modification operations are in the system that any given read operation is likely affected by a data modification made by another user (assumes conflicts will occur). Avoids conflicts by acquiring a lock on data being read so no other processes can modify that data. Also acquires locks on data being modified so no other processes can access the data for either reading or modifying. Readers block writer, writers block readers and writers. Optimistic Concurrency Assumes that there are sufficiently few conflicting data modification operations in the system that any single transaction is unlikely to modify data that another transaction is modifying. Default behavior of optimistic concurrency is to use row versioning to allow data readers to see the state of the data before the modification occurs. Older versions of the data are saved so a process reading data can see the data as it was when the process started reading and not affected by any changes being made to that data. Processes modifying the data is unaffected by processes reading the data because the reader is accessing a saved version of the data rows. Readers do not block writers and writers do not block readers, but, writers can and will block writers. Transaction Processing A transaction is the basic unit of work in SQL Server. Transaction consists of SQL commands that read and update the database but the update is not considered final until a COMMIT command is issued (at least for an explicit transaction: marked with a BEGIN TRAN and the end is marked by a COMMIT TRAN or ROLLBACK TRAN). Transactions must exhibit all the ACID properties of a transaction. ACID Properties Transaction processing must guarantee the consistency and recoverability of SQL Server databases. Ensures all transactions are performed as a single unit of work regardless of hardware or system failure. A – Atomicity C – Consistency I – Isolation D- Durability Atomicity: Each transaction is treated as all or nothing – it either commits or aborts. Consistency: ensures that a transaction won’t allow the system to arrive at an incorrect logical state – the data must always be logically correct.  Consistency is honored even in the event of a system failure. Isolation: separates concurrent transactions from the updates of other incomplete transactions. SQL Server accomplishes isolation among transactions by locking data or creating row versions. Durability: After a transaction commits, the durability property ensures that the effects of the transaction persist even if a system failure occurs. If a system failure occurs while a transaction is in progress, the transaction is completely undone, leaving no partial effects on data. Transaction Dependencies In addition to supporting all four ACID properties, a transaction might exhibit few other behaviors (known as dependency problems or consistency problems). Lost Updates: Occur when two processes read the same data and both manipulate the data, changing its value and then both try to update the original data to the new value. The second process might overwrite the first update completely. Dirty Reads: Occurs when a process reads uncommitted data. If one process has changed data but not yet committed the change, another process reading the data will read it in an inconsistent state. Non-repeatable Reads: A read is non-repeatable if a process might get different values when reading the same data in two reads within the same transaction. This can happen when another process changes the data in between the reads that the first process is doing. Phantoms: Occurs when membership in a set changes. It occurs if two SELECT operations using the same predicate in the same transaction return a different number of rows. Isolation Levels SQL Server supports 5 isolation levels that control the behavior of read operations. Read Uncommitted All behaviors except for lost updates are possible. Implemented by allowing the read operations to not take any locks, and because of this, it won’t be blocked by conflicting locks acquired by other processes. The process can read data that another process has modified but not yet committed. When using the read uncommitted isolation level and scanning an entire table, SQL Server can decide to do an allocation order scan (in page-number order) instead of a logical order scan (following page pointers). If another process doing concurrent operations changes data and move rows to a new location in the table, the allocation order scan can end up reading the same row twice. Also can happen if you have read a row before it is updated and then an update moves the row to a higher page number than your scan encounters later. Performing an allocation order scan under Read Uncommitted can cause you to miss a row completely – can happen when a row on a high page number that hasn’t been read yet is updated and moved to a lower page number that has already been read. Read Committed Two varieties of read committed isolation: optimistic and pessimistic (default). Ensures that a read never reads data that another application hasn’t committed. If another transaction is updating data and has exclusive locks on data, your transaction will have to wait for the locks to be released. Your transaction must put share locks on data that are visited, which means that data might be unavailable for others to use. A share lock doesn’t prevent others from reading but prevents them from updating. Read committed (snapshot) ensures that an operation never reads uncommitted data, but not by forcing other processes to wait. SQL Server generates a version of the changed row with its previous committed values. Data being changed is still locked but other processes can see the previous versions of the data as it was before the update operation began. Repeatable Read This is a Pessimistic isolation level. Ensures that if a transaction revisits data or a query is reissued the data doesn’t change. That is, issuing the same query twice within a transaction cannot pickup any changes to data values made by another user’s transaction because no changes can be made by other transactions. However, this does allow phantom rows to appear. Preventing non-repeatable read is a desirable safeguard but cost is that all shared locks in a transaction must be held until the completion of the transaction. Snapshot Snapshot Isolation (SI) is an optimistic isolation level. Allows for processes to read older versions of committed data if the current version is locked. Difference between snapshot and read committed has to do with how old the older versions have to be. It’s possible to have two transactions executing simultaneously that give us a result that is not possible in any serial execution. Serializable This is the strongest of the pessimistic isolation level. Adds to repeatable read isolation level by ensuring that if a query is reissued rows were not added in the interim, i.e, phantoms do not appear. Preventing phantoms is another desirable safeguard, but cost of this extra safeguard is similar to that of repeatable read – all shared locks in a transaction must be held until the transaction completes. In addition serializable isolation level requires that you lock data that has been read but also data that doesn’t exist. Ex: if a SELECT returned no rows, you want it to return no. rows when the query is reissued. This is implemented in SQL Server by a special kind of lock called the key-range lock. Key-range locks require that there be an index on the column that defines the range of values. If there is no index on the column, serializable isolation requires a table lock. Gets its name from the fact that running multiple serializable transactions at the same time is equivalent of running them one at a time. Now that we understand the basics of what concurrency is, the subsequent blog posts will try to bring out the basics around locking, blocking, deadlocks because they are the fundamental blocks that make concurrency possible. Now if you are with me – let us continue learning for SQL Server Locking Basics. Reference: Pinal Dave (http://blog.sqlauthority.com) Filed under: PostADay, SQL, SQL Authority, SQL Performance, SQL Query, SQL Server, SQL Tips and Tricks, T SQL, Technology Tagged: Concurrency

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• How do I set up pairing email addresses?

  - by James A. Rosen

  Our team uses the Ruby gem hitch to manage pairing. You set it up with a group email address (e.g. [email protected]) and then tell it who is pairing: $ hitch james tiffany Hitch then sets your Git author configuration so that our commits look like commit 629dbd4739eaa91a720dd432c7a8e6e1a511cb2d Author: James and Tiffany <[email protected]> Date: Thu Oct 31 13:59:05 2013 -0700 Unfortunately, we've only been able to come up with two options: [email protected] doesn't exist. The downside is that if Travis CI tries to notify us that we broke the build, we don't see it. [email protected] does exist and forwards to all the developers. Now the downside is that everyone gets spammed with every broken build by every pair. We have too many possible pair to do any of the following: set up actual [email protected] email addresses or groups (n^2 email addresses) set up forwarding rules for [email protected] (n^2 forwarding rules) set up forwarding rules for [email protected] (n forwarding rules for each of n developers) Does anyone have a system that works for them?

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• Using transactions with LINQ-to-SQL

  - by Jalpesh P. Vadgama

  Today one of my colleague asked that how we can use transactions with the LINQ-to-SQL Classes when we use more then one entities updated at same time. It was a good question. Here is my answer for that.For ASP.NET 2.0  or higher version have a new class called TransactionScope which can be used to manage transaction with the LINQ. Let’s take a simple scenario we are having a shopping cart application in which we are storing details or particular order placed into the database using LINQ-to-SQL. There are two tables Order and OrderDetails which will have all the information related to order. Order will store particular information about orders while OrderDetails table will have product and quantity of product for particular order.We need to insert data in both tables as same time and if any errors comes then it should rollback the transaction. To use TransactionScope in above scenario first we have add a reference to System.Transactions like below. After adding the transaction we need to drag and drop the Order and Order Details tables into Linq-To-SQL Classes it will create entities for that. Below is the code for transaction scope to use mange transaction with Linq Context. MyContextDataContext objContext = new MyContextDataContext(); using (System.Transactions.TransactionScope tScope = new System.Transactions.TransactionScope(TransactionScopeOption.Required)) { objContext.Order.InsertOnSubmit(Order); objContext.OrderDetails.InsertOnSumbit(OrderDetails); objContext.SubmitChanges(); tScope.Complete(); } Here it will commit transaction only if using blocks will run successfully. Hope this will help you. Technorati Tags: Linq,Transaction,System.Transactions,ASP.NET

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• Picking a code review tool

  - by marcog

  We are a startup looking to migrate from Fogbugz/Kiln to a new issue tracker/code review system. We are very happy with Jira, especially the configurability, but we are undecided on a code review tool. We have been trialing Bitbucket, but it doesn't fit our workflow well. Here are the problems we have identified with BB: Comments can be hard to find: when commenting on code not visible in the diff when code that is commented on is later changed viewing the full file doesn't include comments (also doesn't show changes) Viewing comments on individual commits can be a pain We have the implementer merge the diff and close the issue, whereas pull requests are more suited to the open source model where someone with commit rights merges We would like to automate creation of the code review (either from Jira or a command line tool) No syntax highlighting Once the pull request exceeds a certain size, BB won't show the whole thing and you have to view individual commits Linking BB pull requests to Jira issues is a bit janky: we have a pull request URL field on Jira, but this doesn't work when there are changes in multiple repositories Does anyone have any good suggestion given the above? We are tight on budget, and Jira integration is a big plus. We also have multiple commits per issue, and would like to have the option of viewing individual commits in the review. It might also be worth noting that we have a separate reviewer and tester for each issue.

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• How to login as other in ubuntu 12.04

  - by murali

  i have upgraded my ubuntu 11.10 to 12.04. i could not see other login option in the login screen. it shows only Guest login and User login. The User Login ask only password and i had never entered in as User login so that i do not know about password of User login. my problem is how to login as root from the login screen? how can i get Other login option to login as root or some other user? before ask this question i have tried the following: try to add the greeter-show-manual-login=true line at the bottom of /etc/lightdm/lightdm.conf file as Guest login but i get access denied error. i do not know the password of User login (ask only password while login) to purpose of adding above line. from the safe mode login, i could login as root but i could not add the above line the lightdm.conf file . i got read only error so that i tried to change the permission to 777 like the following > chmod 777 lightdm.conf (i am within the /etc/lightdm/). but i got the error the file marked as/is read only in the file system. In 11.10 version i have created 4 users. i can see that the users exist in 12.10 . so i am sure my self users are not removed while upgrate. In short, i need Other login option on my login screen? how to get it? please help me. * Edited Question:* i have add the following line the /etc/lightdm/lighdm.conf file on recovery mode greeter-show-manual-login=true and i saved the file using wq command. now my /etc/lightdm/lighdm.conf file looking as the following: [SeatDefaults] greeter-session=unity-greeter user-session=ubuntu greeter-show-manual-login=true if i commit any mistake please correct me. by this problem i have wasted the two working day and all the works are in pending... please help me.

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• Entity Framework &amp; Transactions

  - by Sudheer Kumar

  There are many instances we might have to use transactions to maintain data consistency. With Entity Framework, it is a little different conceptually. Case 1 – Transaction b/w multiple SaveChanges(): here if you just use a transaction scope, then Entity Framework (EF) will use distributed transactions instead of local transactions. The reason is that, EF closes and opens the connection when ever required only, which means, it used 2 different connections for different SaveChanges() calls. To resolve this, use the following method. Here we are opening a connection explicitly so as not to span across multipel connections.   using (TransactionScope ts = new TransactionScope()) {     context.Connection.Open();     //Operation1 : context.SaveChanges();     //Operation2 :  context.SaveChanges()     //At the end close the connection     ts.Complete(); } catch (Exception ex) {       //Handle Exception } finally {       if (context.Connection.State == ConnectionState.Open)       {            context.Connection.Close();       } }   Case 2 – Transaction between DB & Non-DB operations: For example, assume that you have a table that keeps track of Emails to be sent. Here you want to update certain details like DataSent once if the mail was successfully sent by the e-mail client. Email eml = GetEmailToSend(); eml.DateSent = DateTime.Now; using (TransactionScope ts = new TransactionScope()) {    //Update DB    context.saveChanges();   //if update is successful, send the email using smtp client   smtpClient.Send();   //if send was successful, then commit   ts.Complete(); }   Here since you are dealing with a single context.SaveChanges(), you just need to use the TransactionScope, just before saving the context only.   Hope this was helpful!

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• SQL SERVER – Table Variables and Transactions – SQL in Sixty Seconds #007 – Video

  - by pinaldave

  Today’s SQL in Sixty Seconds video is inspired from my presentation at TechEd India 2012 on Misconception and Resolution. Quite often I have seen people getting confused with certain behavior of the T-SQL. They expect SQL to behave certain way and SQL Server behave differently. This kind of issue often creates confusion and frustration. Sometime I have seen them also confusing it with bug and submitting the bug, where reality is totally different. Similar concept which are going to see today. I have seen quite commonly developer assuming that table various will be rolled back when transaction is rolled back. This sixty seconds video describes that table various are not rolled back when transactions are rolled back. More on Errors: Difference Temp Table and Table Variable – Effect of Transaction Effect of TRANSACTION on Local Variable – After ROLLBACK and After COMMIT Debate – Table Variables vs Temporary Tables – Quiz – Puzzle – 13 of 31 I encourage you to submit your ideas for SQL in Sixty Seconds. We will try to accommodate as many as we can. Reference: Pinal Dave (http://blog.sqlauthority.com) Filed under: Database, Pinal Dave, PostADay, SQL, SQL Authority, SQL in Sixty Seconds, SQL Query, SQL Scripts, SQL Server, SQL Tips and Tricks, SQLServer, T SQL, Video

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• PHP Browser Game Question - Pretty General Language Suitability and Approach Question

  - by JimBadger

  I'm developing a browser game, using PHP, but I'm unsure if the way I'm going about doing it is to be encouraged anymore. It's basically one of those MMOs where you level up various buildings and what have you, but, you then commit some abstract fighting entity that the game gives you, to an automated battle with another player (producing a textual, but hopefully amusing and varied combat report). Basically, as soon as two players agree to fight, PHP functions on the "fight.php" page run queries against a huge MySQL database, looking up all sorts of complicated fight moves and outcomes. There are about three hundred thousand combinations of combat stance, attack, move and defensive stances, so obviously this is quite a resource hungry process, and, on the super cheapo hosted server I'm using for development, it rapidly runs out of memory. The PHP script for the fight logic currently has about a thousand lines of code in it, and I'd say it's about half-finished as I try to add a bit of AI into the fight script. Is there a better way to do something this massive than simply having some functions in a PHP file calling the MySQL Database? I taught myself a modicum of PHP a while ago, and most of the stuff I read online (ages ago) about similar games was all PHP-based. but a) am I right to be using PHP at all, and b) am I missing some clever way of doing things that will somehow reduce server resource requirements? I'd consider non PHP alternatives but, if PHP is suitable, I'd rather stick to that, so there's no overhead of learning something new. I think I'd bite that bullet if it's the best option for a better game, though.

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• How to communicate within a company what is being Continually Deployed

  - by Francis Spor

  I work for a small development company, 20 people total in the entire company, 3 in actual development, and we've adopted CD for our commits to trunk, and it works great, from a code management and up-time side. However - we're getting flak from our support staff and marketing department that they don't feel that they're getting enough lead time on new features and notifications on bug fixes that could change behavior. Part of why we love the CD system is for us in development, it's fast, we fix the bug, add the quick feature, close the Bugz and move on with our day to the next item. All members of our company are now on HipChat at all times, and when a deployment occurs, a message is sent to a room that all company members are in, letting them know what was just deployed (it just shows the commit messages from tip back to the last recorded deployment). We in development are also attempting to make sure that when we're making a change that modifies the UI or a public facing behavior, we post a screenshot to the All Company room and explain what the behavior change is, seeking pushback or concerns. Often, the response is silence. Sometimes, it's a few minor questions, but nothing that need stop the deployment from happening. What I'm wondering is how do other users of the CD method deal with notifications of new features and changes to areas of the company that are not development - and eventually on to customers in the world? Thanks, Francis

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• SATA errors reported during boot: exception Emask 0x40 SAct 0x0 SErr 0x80800 action 0x0

  - by digby280

  I have noticed some error during the Linux boot. They seem to continue to occur after the boot adding lines to the log every few seconds. Once booted this normally does not appear to be causing any problems. However, around 1 in 10 boots results in a kernel panic and the computer has on two or three occasions suddenly rebooted after being powered on for a number of hours. I presume the cause of the reboot is a kernel panic as well. I am running Ubuntu 11.10 and I have had Ubuntu installed on the computer for around a year. I have googled around and not found anything useful. I have provided the kernel log lines and the output of smartctl. Can anyone explain exactly what these errors mean, or better still how to resolve them? Apr 2 16:51:27 dell580 kernel: [ 19.831140] EXT4-fs (sdb2): re-mounted. Opts: errors=remount-ro,user_xattr,commit=0 Apr 2 16:51:27 dell580 kernel: [ 19.934194] tg3 0000:03:00.0: eth0: Link is down Apr 2 16:51:28 dell580 kernel: [ 20.929468] tg3 0000:03:00.0: eth0: Link is up at 100 Mbps, full duplex Apr 2 16:51:28 dell580 kernel: [ 20.929471] tg3 0000:03:00.0: eth0: Flow control is on for TX and on for RX Apr 2 16:51:28 dell580 kernel: [ 20.929727] ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready Apr 2 16:51:29 dell580 kernel: [ 21.609381] EXT4-fs (sdb2): re-mounted. Opts: errors=remount-ro,user_xattr,commit=0 Apr 2 16:51:29 dell580 kernel: [ 21.616515] ata2.01: exception Emask 0x40 SAct 0x0 SErr 0x80800 action 0x0 Apr 2 16:51:29 dell580 kernel: [ 21.616519] ata2.01: SError: { HostInt 10B8B } Apr 2 16:51:29 dell580 kernel: [ 21.616525] ata2.00: hard resetting link Apr 2 16:51:29 dell580 kernel: [ 21.934036] ata2.01: hard resetting link Apr 2 16:51:29 dell580 kernel: [ 22.408890] ata2.00: SATA link up 1.5 Gbps (SStatus 113 SControl 300) Apr 2 16:51:29 dell580 kernel: [ 22.408907] ata2.01: SATA link up 3.0 Gbps (SStatus 123 SControl 300) Apr 2 16:51:29 dell580 kernel: [ 22.440934] ata2.00: configured for UDMA/100 Apr 2 16:51:29 dell580 kernel: [ 22.449040] ata2.01: configured for UDMA/133 Apr 2 16:51:29 dell580 kernel: [ 22.449818] ata2: EH complete Apr 2 16:51:33 dell580 kernel: [ 26.122664] ata2.01: exception Emask 0x40 SAct 0x0 SErr 0x80800 action 0x0 Apr 2 16:51:33 dell580 kernel: [ 26.122670] ata2.01: SError: { HostInt 10B8B } Apr 2 16:51:33 dell580 kernel: [ 26.122677] ata2.00: hard resetting link Apr 2 16:51:33 dell580 kernel: [ 26.442684] ata2.01: hard resetting link Apr 2 16:51:34 dell580 kernel: [ 26.925545] ata2.00: SATA link up 1.5 Gbps (SStatus 113 SControl 300) Apr 2 16:51:34 dell580 kernel: [ 26.925561] ata2.01: SATA link up 3.0 Gbps (SStatus 123 SControl 300) Apr 2 16:51:34 dell580 kernel: [ 26.961542] ata2.00: configured for UDMA/100 Apr 2 16:51:34 dell580 kernel: [ 26.969616] ata2.01: configured for UDMA/133 Apr 2 16:51:34 dell580 kernel: [ 26.970400] ata2: EH complete Apr 2 16:51:35 dell580 kernel: [ 28.111180] ata2.01: exception Emask 0x40 SAct 0x0 SErr 0x80800 action 0x0 Apr 2 16:51:35 dell580 kernel: [ 28.111184] ata2.01: SError: { HostInt 10B8B } Apr 2 16:51:35 dell580 kernel: [ 28.111191] ata2.00: hard resetting link Apr 2 16:51:35 dell580 kernel: [ 28.429674] ata2.01: hard resetting link Apr 2 16:51:36 dell580 kernel: [ 28.904557] ata2.00: SATA link up 1.5 Gbps (SStatus 113 SControl 300) Apr 2 16:51:36 dell580 kernel: [ 28.904572] ata2.01: SATA link up 3.0 Gbps (SStatus 123 SControl 300) Apr 2 16:51:36 dell580 kernel: [ 28.936609] ata2.00: configured for UDMA/100 Apr 2 16:51:36 dell580 kernel: [ 28.944692] ata2.01: configured for UDMA/133 Apr 2 16:51:36 dell580 kernel: [ 28.945464] ata2: EH complete Apr 2 16:51:38 dell580 kernel: [ 31.581756] eth0: no IPv6 routers present Apr 2 16:51:38 dell580 kernel: [ 32.103066] ata2.01: exception Emask 0x40 SAct 0x0 SErr 0x80800 action 0x0 Apr 2 16:51:38 dell580 kernel: [ 32.103074] ata2.01: SError: { HostInt 10B8B } Apr 2 16:51:38 dell580 kernel: [ 32.103085] ata2.00: hard resetting link Apr 2 16:51:38 dell580 kernel: [ 32.419669] ata2.01: hard resetting link Apr 2 16:51:39 dell580 kernel: [ 32.894518] ata2.00: SATA link up 1.5 Gbps (SStatus 113 SControl 300) Apr 2 16:51:39 dell580 kernel: [ 32.894533] ata2.01: SATA link up 3.0 Gbps (SStatus 123 SControl 300) Apr 2 16:51:39 dell580 kernel: [ 32.926536] ata2.00: configured for UDMA/100 Apr 2 16:51:39 dell580 kernel: [ 32.934715] ata2.01: configured for UDMA/133 Apr 2 16:51:39 dell580 kernel: [ 32.935578] ata2: EH complete Here's the output of smartctl for the drive. smartctl 5.41 2011-06-09 r3365 [x86_64-linux-3.0.0-17-generic] (local build) Copyright (C) 2002-11 by Bruce Allen, http://smartmontools.sourceforge.net === START OF INFORMATION SECTION === Model Family: SAMSUNG SpinPoint F1 DT Device Model: SAMSUNG HD103UJ Serial Number: S13PJ90QC19706 LU WWN Device Id: 5 0000f0 00b1c7960 Firmware Version: 1AA01113 User Capacity: 1,000,204,886,016 bytes [1.00 TB] Sector Size: 512 bytes logical/physical Device is: In smartctl database [for details use: -P show] ATA Version is: 8 ATA Standard is: ATA-8-ACS revision 3b Local Time is: Mon Apr 2 17:13:48 2012 BST SMART support is: Available - device has SMART capability. SMART support is: Enabled === START OF READ SMART DATA SECTION === SMART overall-health self-assessment test result: PASSED General SMART Values: Offline data collection status: (0x00) Offline data collection activity was never started. Auto Offline Data Collection: Disabled. Self-test execution status: ( 41) The self-test routine was interrupted by the host with a hard or soft reset. Total time to complete Offline data collection: (11772) seconds. Offline data collection capabilities: (0x7b) SMART execute Offline immediate. Auto Offline data collection on/off support. Suspend Offline collection upon new command. Offline surface scan supported. Self-test supported. Conveyance Self-test supported. Selective Self-test supported. SMART capabilities: (0x0003) Saves SMART data before entering power-saving mode. Supports SMART auto save timer. Error logging capability: (0x01) Error logging supported. General Purpose Logging supported. Short self-test routine recommended polling time: ( 2) minutes. Extended self-test routine recommended polling time: ( 197) minutes. Conveyance self-test routine recommended polling time: ( 21) minutes. SCT capabilities: (0x003f) SCT Status supported. SCT Error Recovery Control supported. SCT Feature Control supported. SCT Data Table supported. SMART Attributes Data Structure revision number: 16 Vendor Specific SMART Attributes with Thresholds: ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE 1 Raw_Read_Error_Rate 0x000f 100 100 051 Pre-fail Always - 0 3 Spin_Up_Time 0x0007 076 076 011 Pre-fail Always - 7940 4 Start_Stop_Count 0x0032 099 099 000 Old_age Always - 521 5 Reallocated_Sector_Ct 0x0033 100 100 010 Pre-fail Always - 0 7 Seek_Error_Rate 0x000f 253 253 051 Pre-fail Always - 0 8 Seek_Time_Performance 0x0025 100 100 015 Pre-fail Offline - 0 9 Power_On_Hours 0x0032 100 100 000 Old_age Always - 642 10 Spin_Retry_Count 0x0033 100 100 051 Pre-fail Always - 0 11 Calibration_Retry_Count 0x0012 100 100 000 Old_age Always - 0 12 Power_Cycle_Count 0x0032 100 100 000 Old_age Always - 482 13 Read_Soft_Error_Rate 0x000e 100 100 000 Old_age Always - 0 183 Runtime_Bad_Block 0x0032 100 100 000 Old_age Always - 759 184 End-to-End_Error 0x0033 100 100 000 Pre-fail Always - 0 187 Reported_Uncorrect 0x0032 100 100 000 Old_age Always - 0 188 Command_Timeout 0x0032 100 100 000 Old_age Always - 0 190 Airflow_Temperature_Cel 0x0022 073 069 000 Old_age Always - 27 (Min/Max 16/27) 194 Temperature_Celsius 0x0022 073 067 000 Old_age Always - 27 (Min/Max 16/28) 195 Hardware_ECC_Recovered 0x001a 100 100 000 Old_age Always - 320028 196 Reallocated_Event_Count 0x0032 100 100 000 Old_age Always - 0 197 Current_Pending_Sector 0x0012 100 100 000 Old_age Always - 0 198 Offline_Uncorrectable 0x0030 100 100 000 Old_age Offline - 0 199 UDMA_CRC_Error_Count 0x003e 099 099 000 Old_age Always - 1494 200 Multi_Zone_Error_Rate 0x000a 100 100 000 Old_age Always - 0 201 Soft_Read_Error_Rate 0x000a 253 253 000 Old_age Always - 0 SMART Error Log Version: 1 ATA Error Count: 211 (device log contains only the most recent five errors) CR = Command Register [HEX] FR = Features Register [HEX] SC = Sector Count Register [HEX] SN = Sector Number Register [HEX] CL = Cylinder Low Register [HEX] CH = Cylinder High Register [HEX] DH = Device/Head Register [HEX] DC = Device Command Register [HEX] ER = Error register [HEX] ST = Status register [HEX] Powered_Up_Time is measured from power on, and printed as DDd+hh:mm:SS.sss where DD=days, hh=hours, mm=minutes, SS=sec, and sss=millisec. It "wraps" after 49.710 days. Error 211 occurred at disk power-on lifetime: 0 hours (0 days + 0 hours) When the command that caused the error occurred, the device was active or idle. After command completion occurred, registers were: ER ST SC SN CL CH DH -- -- -- -- -- -- -- 84 51 0f 31 63 8f e1 Error: ICRC, ABRT 15 sectors at LBA = 0x018f6331 = 26174257 Commands leading to the command that caused the error were: CR FR SC SN CL CH DH DC Powered_Up_Time Command/Feature_Name -- -- -- -- -- -- -- -- ---------------- -------------------- c8 00 00 40 62 8f e1 08 00:01:00.460 READ DMA c8 00 20 00 7c 30 e0 08 00:01:00.450 READ DMA c8 00 00 10 49 8f e1 08 00:01:00.440 READ DMA c8 00 e0 20 d0 30 e0 08 00:01:00.420 READ DMA c8 00 00 c0 59 90 e1 08 00:01:00.400 READ DMA Error 210 occurred at disk power-on lifetime: 0 hours (0 days + 0 hours) When the command that caused the error occurred, the device was active or idle. After command completion occurred, registers were: ER ST SC SN CL CH DH -- -- -- -- -- -- -- 84 51 cf e9 cf 66 e0 Error: ICRC, ABRT 207 sectors at LBA = 0x0066cfe9 = 6737897 Commands leading to the command that caused the error were: CR FR SC SN CL CH DH DC Powered_Up_Time Command/Feature_Name -- -- -- -- -- -- -- -- ---------------- -------------------- c8 00 00 b8 cf 66 e0 08 00:08:29.780 READ DMA c8 00 60 60 c9 18 e0 08 00:08:29.770 READ DMA c8 00 40 20 c9 18 e0 08 00:08:29.770 READ DMA c8 00 20 00 c9 18 e0 08 00:08:29.760 READ DMA c8 00 20 98 cf 66 e0 08 00:08:29.750 READ DMA Error 209 occurred at disk power-on lifetime: 0 hours (0 days + 0 hours) When the command that caused the error occurred, the device was active or idle. After command completion occurred, registers were: ER ST SC SN CL CH DH -- -- -- -- -- -- -- 84 51 2f d1 74 e0 e0 Error: ICRC, ABRT 47 sectors at LBA = 0x00e074d1 = 14709969 Commands leading to the command that caused the error were: CR FR SC SN CL CH DH DC Powered_Up_Time Command/Feature_Name -- -- -- -- -- -- -- -- ---------------- -------------------- c8 00 00 00 74 e0 e0 08 00:00:30.940 READ DMA c8 00 20 18 36 de e0 08 00:00:30.930 READ DMA c8 00 08 48 f1 dd e0 08 00:00:30.930 READ DMA c8 00 08 a8 f0 dd e0 08 00:00:30.930 READ DMA c8 00 08 90 f0 dd e0 08 00:00:30.930 READ DMA Error 208 occurred at disk power-on lifetime: 0 hours (0 days + 0 hours) When the command that caused the error occurred, the device was active or idle. After command completion occurred, registers were: ER ST SC SN CL CH DH -- -- -- -- -- -- -- 84 51 7f 21 88 9d e0 Error: ICRC, ABRT 127 sectors at LBA = 0x009d8821 = 10324001 Commands leading to the command that caused the error were: CR FR SC SN CL CH DH DC Powered_Up_Time Command/Feature_Name -- -- -- -- -- -- -- -- ---------------- -------------------- c8 00 a0 00 88 9d e0 08 00:00:27.610 READ DMA c8 00 58 a8 e7 9c e0 08 00:00:27.610 READ DMA c8 00 00 28 e6 9c e0 08 00:00:27.610 READ DMA c8 00 00 e0 e4 9c e0 08 00:00:27.610 READ DMA c8 00 00 90 e0 9c e0 08 00:00:27.600 READ DMA Error 207 occurred at disk power-on lifetime: 0 hours (0 days + 0 hours) When the command that caused the error occurred, the device was active or idle. After command completion occurred, registers were: ER ST SC SN CL CH DH -- -- -- -- -- -- -- 04 51 26 6a 6a c3 e0 Error: ABRT at LBA = 0x00c36a6a = 12806762 Commands leading to the command that caused the error were: CR FR SC SN CL CH DH DC Powered_Up_Time Command/Feature_Name -- -- -- -- -- -- -- -- ---------------- -------------------- ca 00 00 90 69 c3 e0 08 00:29:39.350 WRITE DMA ca 00 40 90 68 c3 e0 08 00:29:39.350 WRITE DMA ca 00 40 50 65 c3 e0 08 00:29:39.350 WRITE DMA ca 00 40 d0 64 c3 e0 08 00:29:39.350 WRITE DMA ca 00 40 90 63 c3 e0 08 00:29:39.350 WRITE DMA SMART Self-test log structure revision number 1 Num Test_Description Status Remaining LifeTime(hours) LBA_of_first_error # 1 Short offline Interrupted (host reset) 90% 638 - # 2 Short offline Interrupted (host reset) 90% 638 - # 3 Extended offline Interrupted (host reset) 90% 638 - # 4 Short offline Interrupted (host reset) 90% 638 - # 5 Extended offline Interrupted (host reset) 90% 638 - SMART Selective self-test log data structure revision number 1 SPAN MIN_LBA MAX_LBA CURRENT_TEST_STATUS 1 0 0 Not_testing 2 0 0 Not_testing 3 0 0 Not_testing 4 0 0 Not_testing 5 0 0 Not_testing Selective self-test flags (0x0): After scanning selected spans, do NOT read-scan remainder of disk. If Selective self-test is pending on power-up, resume after 0 minute delay.

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• SO-overflow induced passivity - how to cope?

  - by Ruben

  After not really working on my pet project for a while, I discovered Stackoverflow and upon perusing it more intensely I was quite amazed. I'm a bit of a perfectionist, so when I found eye-openers here highlighting many of the mistakes I made, I first wanted to fix everything. However, it's a pet project for a reason: I'm self-taught and I'm studying psychology, so programming skills can never become priority one (though it often helps, even in this field). Issues that stuck out were numerous security issues (e.g. CSRF-prevention and bcrypt eluded me) not object-oriented (at least the PHP part, the JS-part mostly is) no PHP framework used, so many of my DIY takes on commonly-tackled components (auth, ...) are either bad or inefficient really poor MySQL usage (no prepared statements, mysql extension, heard about setting proper indices two days ago) using mootools even though JQuery seems to be fashionable, so there's more probably always going to be better integration with services I'd like to use (like google visualization) So, my SO-induced frenzy turned into passivity. I can't do it all (soon) in the rather small amount of spare time I can spend on working on my project. I can leave some of the issues be in good conscience (speed stuff: an unfinished & unpublished project will never become popular, right?). No clear conscience without good security though and if I don't use a framework for auth and other complex stuff I'll regret having to do it myself. One obvious answer would probably be going open-source, but I think the project would need to become more impressive before others would commit to it. I can't afford to employ someone either. I do think the project deserves being worked on, though. How should I tackle it anyway? What's the best practice for little-practice people?

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• Best way to convert existing project to be open source in GitHub

  - by Tom

  I've been working on a personal closed source project for some time and would like to make it open source. I've never created my own open source project before so it will be a good learning experience. I have been using GitHub as source control, so once I've written some decent docs on how to use and develop for it etc, it should be as simple as switching the repo to be public right? I guess my main question is around licencing. I was thinking of going with Apache 2.0 licence just because it seems to be widely used. It requires the licence header to be attached to all the source files, but if I do that now then all the other commits in the past will have it missing. Does that mean some one could pull an earlier version and it wouldn't have a licence? Is it best to start a new repo with the initial commit containing all the code with licence headers? Or maybe is there some advanced Git functionality that allows me to apply the licence header to all existing commits some how? Cheers.

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• Bridged VM guest does not get IPv6 prefix

  - by Arne

  I have a similar problem and setup as described in IPv6 does not work over bridge. My host get a IPv6 prefix but the guest VM only gets a local fe80-prefix. Using tcpdump I can see that solicit messages are going out from the guest but the host (ubuntu-server) doesn't seem to respond: arne@ubuntu-server:/var/log$ sudo tcpdump -i br0 host fe80::5054:00ff:fe4d:9ae0 tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on br0, link-type EN10MB (Ethernet), capture size 65535 bytes 14:31:15.314419 IP6 fe80::5054:ff:fe4d:9ae0 > ff02::16: HBH ICMP6, multicast listener report v2, 4 group record(s), length 88 14:31:15.322337 IP6 fe80::5054:ff:fe4d:9ae0 > ff02::16: HBH ICMP6, multicast listener report v2, 1 group record(s), length 28 14:31:15.502374 IP6 fe80::5054:ff:fe4d:9ae0 > ff02::16: HBH ICMP6, multicast listener report v2, 1 group record(s), length 28 14:31:15.743894 IP6 fe80::5054:ff:fe4d:9ae0.dhcpv6-client > ff02::1:2.dhcpv6-server: dhcp6 solicit 14:31:15.802389 IP6 fe80::5054:ff:fe4d:9ae0 > ff02::16: HBH ICMP6, multicast listener report v2, 4 group record(s), length 88 14:31:17.906580 IP6 fe80::5054:ff:fe4d:9ae0.dhcpv6-client > ff02::1:2.dhcpv6-server: dhcp6 solicit I had a firewall issue which I fixed by adding the following (copied from similar IPv4 before.rules settings) to /etc/ufw/before6.rules at the end before the commit statement: # allow bridging (for KVM) -I FORWARD -m physdev --physdev-is-bridged -j ACCEPT I am running the host on a Ubuntu 14.04 server so I guess I could have used dnsmasq but I didn't find any howto for it so I used radvd (which had to be installed) with the following configuration in /etc/radvd.conf: interface br0 { AdvSendAdvert on; AdvLinkMTU 1480; prefix 2a01:79d:xxx::/64 { AdvOnLink on; AdvAutonomous on; }; }; This didn't help though so I guess I must have configured it wrong? Any help appreciated. Br, Arne PS: I wish the Ubuntu documentation included how to configure virtualization to work with IPv6

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• Performance Overhead of Encrypted /home

  - by SabreWolfy

  I have a netbook with Windows on the second partition and Xubuntu (/ and /home) on the third partition. I selected to encrypt my home folder during installation. The performance of the netbook is adequate for the small machine that it is, but I'm looking to improve performance. I could not find much information about the overhead (CPU or drive) associated with home partition encryption. I ran the following, writing to my home partition as well as the the mounted Windows partition: dd if=/dev/zero of=~/dummy bs=512 count=10240 dd if=/dev/zero of=/media/Windows/dummy bs=512 count=10240 The first returned 2.4MB/s and the second returned 2.5MB/s. Can I therefore deduce that there is very little overhead to home folder encryption? I'm not sure if the different filesystems will make any difference (/ and /home are ext3). Update 1 I don't know why I didn't use /tmp instead of the mounted Windows folder. Only /home is encrypted, so /tmp is unencrypted ext3. The results of the dd as above are astounding: ~: 2.4 MB/s /tmp: 42.6 MB/s Comments please? The reason I am asking this is that disk access on the netbook is noticeably slow. Update 2 I timed each of the dd operations with time: ~: real 0m2.217s user 0m0.028s sys 0m2.176s /tmp: real 0m0.152s user 0m0.012s sys 0m0.136s See also: discussion on UbuntuForums.org and bug report Edit: Output of mount: /dev/sda3 on / type ext3 (rw,noatime,errors=remount-ro,user_xattr,commit=600) proc on /proc type proc (rw,noexec,nosuid,nodev) none on /sys type sysfs (rw,noexec,nosuid,nodev) fusectl on /sys/fs/fuse/connections type fusectl (rw) none on /sys/kernel/debug type debugfs (rw) none on /sys/kernel/security type securityfs (rw) none on /dev type devtmpfs (rw,mode=0755) none on /dev/pts type devpts (rw,noexec,nosuid,gid=5,mode=0620) none on /dev/shm type tmpfs (rw,nosuid,nodev) none on /var/run type tmpfs (rw,nosuid,mode=0755) none on /var/lock type tmpfs (rw,noexec,nosuid,nodev) binfmt_misc on /proc/sys/fs/binfmt_misc type binfmt_misc (rw,noexec,nosuid,nodev) gvfs-fuse-daemon on /home/USER/.gvfs type fuse.gvfs-fuse-daemon (rw,nosuid,nodev,user=USER) `

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• ubuntu 12.04 not responding after software update

  - by Loukas

  Yesterday, I did a software update and since then the system became unusable. To be more precise, I login and then I see only the background image without any bars, images etc.. This happened after updating the system. Please find here the relevant part /var/log/apt/history.log. I'm running 64 bit 12.04 distribution on nVidia. The 2-3 first restarts after the upgrade it was complaining about compiz/unity crashes and then the situation is as described above. I would be the most grateful of you could help me on this. Best regards, Loukas Start-Date: 2012-06-05 10:31:42 Commandline: aptdaemon role='role-commit-packages' sender=':1.77' Upgrade: libpolkit-backend-1-0:amd64 (0.104-1, 0.104-1ubuntu1), libgnome-control-center1:amd64 (3.4.1-0ubuntu2, 3.4.2-0ubuntu0.2), libgl1-mesa-dri:amd64 (8.0.2-0ubuntu3, 8.0.2-0ubuntu3.1), libgl1-mesa-dri:i386 (8.0.2-0ubuntu3, 8.0.2-0ubuntu3.1), libgl1-mesa-glx:amd64 (8.0.2-0ubuntu3, 8.0.2-0ubuntu3.1), libgl1-mesa-glx:i386 (8.0.2-0ubuntu3, 8.0.2-0ubuntu3.1), libpolkit-gobject-1-0:amd64 (0.104-1, 0.104-1ubuntu1), gnome-control-center-data:amd64 (3.4.1-0ubuntu2, 3.4.2-0ubuntu0.2), libglapi-mesa:amd64 (8.0.2-0ubuntu3, 8.0.2-0ubuntu3.1), libglapi-mesa:i386 (8.0.2-0ubuntu3, 8.0.2-0ubuntu3.1), policykit-1:amd64 (0.104-1, 0.104-1ubuntu1), software-center:amd64 (5.2.2.1, 5.2.2.2), update-manager:amd64 (0.156.14.4, 0.156.14.5), update-manager-core:amd64 (0.156.14.4, 0.156.14.5), libxatracker1:amd64 (8.0.2-0ubuntu3, 8.0.2-0ubuntu3.1), libpolkit-agent-1-0:amd64 (0.104-1, 0.104-1ubuntu1), gnome-control-center:amd64 (3.4.1-0ubuntu2, 3.4.2-0ubuntu0.2), libglu1-mesa:amd64 (8.0.2-0ubuntu3, 8.0.2-0ubuntu3.1), libglu1-mesa:i386 (8.0.2-0ubuntu3, 8.0.2-0ubuntu3.1) End-Date: 2012-06-05 10:32:51

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• Repairing The Visual Studio 2012 UI

  - by Ken Cox [MVP]

  I have sympathy for ‘Softies who don’t like the controversial ‘Metro’ UI changes but are afraid to say so. After all, who wants to commit a CLM (Career-Limiting Move) by declaring that the Emperor has no clothes (or gradients) and that ALL CAPS IN MENUS ARE DUMB? Talk about power! Here’s a higher-up (anyone got a name?) who has enforced a flat, monochrome, uninteresting user interface in Visual Studio 2012  that has been damned with faint praise by consumers. The pushback must have been enormous. Some ‘Softies disengage from the raging debate with, “It’s not my decision” while others feebly point out that the addition of some colour pixels in the icons is a real improvement over the beta version. True, I guess. With the UI pretty much locked, its down to repairing the damage. Fortunately, some Empire dissident has leaked the news to a blogger that  those SHOUTING CAPs aren’t hardcoded afterall: How To Prevent Visual Studio 2012 ALL CAPS Menus And so it goes. By RTM, I’m sure there will be many more add-ons to help us ‘de-Metro’ VS 2012 and recreate our favourite Visual Studio 2010 themes for it.

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• Facilitating XNA game deployments for non programmers

  - by Sal

  I'm currently working on an RPG, using the RPG starter kit from XNA as a base. (http://xbox.create.msdn.com/en-US/education/catalog/sample/roleplaying_game) I'm working with a small team (two designers and one music/sound artist), but I'm the only programmer. Currently, we're working with the following (unsustainable) system: the team creates new pics/sounds to add to the game, or they modify existing sounds/pics, then they commit their work to a repository, where we keep a current build of everything. (Code, images, sound, etc.) Every day or so, I create a new installer, reflecting the new images, code changes, and sound, and everyone installs it. My issue is this: I want to create a system where the rest of the team can replace the combat sounds, for instance, and they can immediately see the changes, without having to wait for me to build. The way XNA's setup, if I publish, it encodes all of the image and sound files, so the team can't "hot swap." I can set up Microsoft VS on everyone's machine and show them how to quickly publish, but I wanted to know if there was a simpler way of doing this. Has anyone come up against this when working with teams using XNA?

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• Git Project Dependencies on GitHub

  - by VirtuosiMedia

  I've written a PHP framework and a CMS on top of the framework. The CMS is dependent on the framework, but the framework exists as a self-contained folder within the CMS files. I'd like to maintain them as separate projects on GitHub, but I don't want to have the mess of updating the CMS project every time I update the framework. Ideally, I'd like to have the CMS somehow pull the framework files for inclusion into a predefined sub-directory rather than physically committing those files. Is this possible with Git/GitHub? If so, what do I need to know to make it work? Keep in mind that I'm at a very, very basic level of experience with Git - I can make repositories and commit using the Git plugin for Eclipse, connect to GitHub, and that's about it. I'm currently working solo on the projects, so I haven't had to learn much more about Git so far, but I'd like to open it up to others in the future and I want to make sure I have it right. Also, what should my ideal workflow be for projects with dependencies? Any tips on that subject would also greatly appreciated. If you need more info on my setup, just ask in the comments.

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• C IDE for Mac needed

  - by StasM

  I'm looking for heavy-duty C/C++ IDE for Mac that would satisfy the following criteria: Work with big projects (~5000 files, some of them 100K big) efficiently. Have good navigation both file-based and symbol-based - i.e. "go to file", "go to function" etc. with autocompletion support. Support for "go to declaration/definition" for symbols - functions, structures, etc. Auto-adding new files in folders already in the project. Support for code completion for values, function names, etc. At least rudimentary CPP macro understanding - i.e. #define foo bar then foo() should take me either to #define or to actual bar. I understand full CPP parsing may be hard, but I hope for at least the obvious cases. Support for displaying parameter names/types by function name, preferably - integrated with the previous item, for functions defined in the project. Support for libc would be nice too :) (optional) Cross-project search support (I can manage with grep -r if everything else works) (optional) SVN support, at least to some extent (update, commit, mark updated) Is there such editor around? Free would be nice, but I'm ready to part with some money if it's good enough. I'm using TextMate now but I'm not satisfied with it. Tried Xcode but it seems to not be able to handle a large project - it just crashed...

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• How to use the unit of work and repository patterns in a service oriented enviroment

  - by A. Karimi

  I've created an application framework using the unit of work and repository patterns for it's data layer. Data consumer layers such as presentation depend on the data layer design. For example a CRUD abstract form has a dependency to a repository (IRepository). This architecture works like a charm in client/server environments (Ex. a WPF application and a SQL Server). But I'm looking for a good pattern to change or reuse this architecture for a service oriented environment. Of course I have some ideas: Idea 1: The "Adapter" design pattern Keep the current architecture and create a new unit of work and repository implementation which can work with a service instead of the ORM. Data layer consumers are loosely coupled to the data layer so it's possible but the problem is about the unit of work; I have to create a context which tracks the objects state at the client side and sends the changes to the server side on calling the "Commit" (Something that I think the RIA has done for Silverlight). Here the diagram: ----------- CLIENT----------- | ------------------ SERVER ---------------------- [ UI ] -> [ UoW/Repository ] ---> [ Web Services ] -> [ UoW/Repository ] -> [DB] Idea 2: Add another layer Add another layer (let say "local services" or "data provider"), then put it between the data layer (unit of work and repository) and the data consumer layers (like UI). Then I have to rewrite the consumer classes (CRUD and other classes which are dependent to IRepository) to depend on another interface. And the diagram: ----------------- CLIENT ------------------ | ------------------- SERVER --------------------- [ UI ] -> [ Local Services/Data Provider ] ---> [ Web Services ] -> [ UoW/Repository ] -> [DB] Please note that I have the local services layer on the current architecture but it doesn't expose the data layer functionality. In another word the UI layer can communicate with both of the data and local services layers whereas the local services layer also uses the data layer. | | | | | | | | ---> | Local Services | ---> | | | UI | | | | Data | | | | | | | ----------------------------> | |

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• Debugging/Logging Techniques for End Users

  - by James Burgess

  I searched a bit, but didn't find anything particularly pertinent to my problem - so please do excuse me if I missed something! A few months back I inherited the source to a fairly-popular indie game project and have been working, along with another developer, on the code-base. We recently made our first release since taking over the development but we're a little stuck. A few users are experiencing slowdowns/lagging in the current version, as compared to the previous version, and we are not able to reproduce these issues in any of our various development environments (debug, release, different OSes, different machines, etc.). What I'd like to know is how can we go about implementing some form of logging/debugging mechanism into the game, that users can enable and send the reports to us for examination? We're not able to distribute debug binaries using the MSVS 2010 runtimes, due to the licensing - and wouldn't want to, for a variety of reasons. We'd really like to get to the bottom of this issue, even if just to find out it's nothing to do with our code base but everything to do with their system configuration. At the moment, we just have no leads - and the community isn't a very technically-savvy one, so we're unable to rely on 'expert' bug reports or investigations. I've seen the debug logging mechanism used in other applications and games for everything from logging simple errors to crash dumps. We're really at a loss at this stage as to how to address these issues, having been over every commit to the repository from the previous to the current version and not finding any real issues.

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• How atomic is a SELECT INTO?

  - by leo.pasta

  Last week I got an interesting situation that prompted me to challenge a long standing assumption. I always thought that a SELECT INTO was an atomic statement, i.e. it would either complete successfully or the table would not be created. So I got very surprised when, after a “select into” query was chosen as a deadlock victim, the next execution (as the app would handle the deadlock and retry) would fail with: Msg 2714, Level 16, State 6, Line 1 There is already an object named '#test' in the database. The only hypothesis we could come up was that the “create table” part of the statement was committed independently from the actual “insert”. We can confirm that by capturing the “Transaction Log” event on Profiler (filtering by SPID0). The result is that when we run: SELECT * INTO #results FROM master.sys.objects we get the following output on Profiler: It is easy to see the two independent transactions. Although this behaviour was a surprise to me, it is very easy to workaround it if you feel the need (as we did in this case). You can either change it into independent “CREATE TABLE / INSERT SELECT” or you can enclose the SELECT INTO in an explicit transaction: SET XACT_ABORT ON BEGIN TRANSACTION SELECT * INTO #results FROM master.sys.objects COMMIT

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