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Sabtu, 15 Oktober 2011

Personal source code control system

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Personal source code control system

   The two most important software tools under developers disposal are an Integrated Development Environment (IDE) and a source code control system (SCCS). There is a myriad of SCCSs. Some of the better known ones are Team Foundation Server, CVS, Subversion, and others. Each one of them has its own advantages appropriate for the environment in which they are used. The simplicity and low maintenance are key SCCS features that an individual developer is interested in a SCCS.

   After months of Windows Phone app development I reached the point where the absence of a SCCS was hampering my app development. Having used several different SCCS throughout my career, I found Subversion with TortoiseSVN client to be the best option for personal use. TortoiseSVN provides a GUI interface for Subversion. It is a free open-source client that seamlessly integrates into the Windows Explorer shell and Visual Studio. The installer consists of a single installer that installs Subversion and the TortoiseSVN client. Understanding the capabilities and limitations of Subversion and TortoiseSVN makes the software development a pleasant experiences. I highly recommend reading TortoiseSVN help which is by itself sufficient reading to able to fully utilize its potential. The goal of this post is not to rewrite what is already present in the help guide, but to describe the most commonly used operations in a concise manner and serve as a reference for the following operations: creating a repository, tagging, and branching.


Repository
Repository is a central store of data. There are two approaches to creating repository.

  • A single repository shared between multiple projects
  • One repository per project. 
If you are new to TortoiseSVN I recommend creating one repository per project. Here are the steps to accomplish that.
Creating a repository
1. Create a folder for repository (i.e. MyRepository)


2. Create a folder inside MyRepository for your project (MyProject)


3. Right click on MyProject and choose Create repository here.


4. We need to create a repository folder structure. The folder structure recommended by Subversion consists of:
Trunk - Main line.
Branches - Temporary working code stream. A branch is created when starting a new feature development. It is deleted upon feature completion and merged into to the trunk. The branch may be deleted  only once it has been reintegrated into the trunk.
Tags - Permanent markers such as MyProject release version.  Once the branch has been merged into to the trunk, we may want to create a tag so that we know at what point the trunk was modified. Tags are particularly useful for tagging release versions.
5. Since our repository will contain trunk, branches, and tags, we need to create a corresponding folder structure. Create another folder (in any location) with following subfolders: trunk, branches, tags. This folder will be used only temporarily in order to import the folder structure into the repository.


6. Right click on the folder and choose Import making sure the URL repository is pointing to your project trunk. This will copy the 3 subfolders into the repository. You may delete the entire temporary folder now. It is not needed anymore.




7. Create a working project folder (anywhere outside of repository folder) where you will be doing the development (MyWorkFolder). We will point it to the trunk initially.


8. Now we need to get the files into the repository. If you already have project files, copy your entire project to the MyWorkFolder folder created in the previous step.


9. Right click on the folder (MyWorkFolder) and choose SVN Checkout. The repository URL will point to the project folder (MyProject) in the repository that contains the 3 imported folders. You need to edit the URL by appending trunk to the end of URL since we want the files to be stored in the trunk folder. Also, make sure the checkout directory is pointing to the location of your folder. There should be no name of the project at the end. The warning message the folder is not empty will be displayed. That is fine, you may click OK.



Since the file://Drive:/MyRepository/MyProject/trunk folder was empty no file was brought down.
10. Right click on the folder MyWorkFolder and select SVN Add. Add all the files.


11. Right click on the MyWorkFolder folder again and choose SVN Commit. This will copy the all the files that were added in the previous step to the file://Drive:/MyRepository/MyProject/trunk. Make sure at every step that the repository link is pointing to the trunk.


12. You are done. The repository is created and the working copy is set to MyWorkFolder folder. The repository contains the initial revision of our project.

Tags
Tags are static snapshots of the project. They are not used for development (that is what branches are for). Working on a tag revision is not a good idea, but because your local files are not write protected there is nothing to stop you doing this by mistake. However, if you try to commit to a path in the repository which contains /tags/, TortoiseSVN will warn you.  It may be that you need to make further changes to a release which you have already tagged. The correct way to handle this is to create a new branch from the tag first and commit the branch. Make your changes on this branch and then create a new tag from this new branch, e.g. Version_1.0.1.
If you modify a working copy created from a branch and commit, then all changes go to the new branch and not the trunk. Only the modifications are stored. The rest remains a cheap copy.

Creating a tag
1. Creating a tag is the same as creating a branch. Right click on MyWorkFolder folder and choose Branch/tag option.


2. The To URL will point to file://Drive/MyRepository/MyProject/trunk. You need to edit this to file://Drive/MyRepository/MyProject/tags/TagName where tag name would typically be the release name such as Release_v1.0.


The revision graph shows the tag created.


Branches
If you wish to start a new development, the best approach it to create a new branch. Once the development has been completed the branch will have to be merged with the trunk. Let's create a new branch now.

Creating a branch
1. Right click MyWorkFolder and choose Branch/Tag.
2. The To URL will point to file:///Drive:/MyRepository/MyProject/trunk. You want to edit this to file:///D:/MyRepository/MyProject/branches/BranchName where BranchName would the name of the branch which is in our case NewFeatureBranch.


3. Unlike tag, creating a branch requires switching the working copy to the new URL. There is a checkbox at the bottom left corner of dialog that needs to be checked. If you have already created a branch without selecting the checkbox, you can switch the current working copy to the new one by executing Switch operation.
4. The branch has been created and the new working copy is pointing to MyWorkFolder.



Creating a new folder and pointing it to the working copy will make the merge process smoother.
5. Create a new folder, NewFeatureFolder, which will be the branch working folder. It will contain the working copy. Since the folder does not contain any files we need to get the files from the repository into the folder.
6. Right click on NewFeatureFolder folder and choose Checkout option. Make sure the URL repository is pointing to the branch you created in the previous steps. 
7. Right click on NewFeatureFolder folder and choose SwitchWe need to switch the working copy to point to our newly created folder.


8. We have a new branch pointing to the branch working copy. Any changes made to the working copy and committed will modify the branch in repository. They will not affect the trunk.

Merging
1. Make sure all the files in the branch have been added and committed.
2. Right click the working copy folder of the trunk, MyWorkFolder, and choose Merge. Make sure you click on the trunk working copy!


3. Select Reintegrate a branch. There are 3 types of merges. Each one is explained thoroughly in the TortoiseSVN help.


4. Click Next. Dialog with the source location of the merge is displayed. Select the URL of the branch you wish to merge.


5. Click Next. Dialog with merge options is displayed. You may leave all the default selections.
6. Click Test merge. It is crucial to test the merge first. It will display the changes that will be performed on the trunk during merge.


7. If the test succeeds we can execute the actual merge by clicking Merge button. In case the test merge operation fails, we may need to execute SVN Update operation on the working copy.
8. At this point, we have merged the branch code into the trunk working copy. We have to commit the changes to the repository. Right click MyWorkFolder and choose Commit.
9. The merge is complete and we can safely delete the branch in the repo-browser.

Conclusion
Having a quality source code control system and being able to utilize its full potential makes the software development more enjoyable. The time invested in setting SCCS up and getting familiar with it pays off quickly when you start reaping the benefits of code comparison, branching, tagging, roll back, and many others.



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