GIT and SW Versioning
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GIT = is a distributed revision control system for software.
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there are a number of free resources to use GIT and host remotely your code - GitHub and Bitbucket are popular
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you can also buy commercial versions
you have code on your local development machine (local git repository) that you can create versions of and commit to a remote Git repository.
repository = a location storing and mantaining versioned code
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another view
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very useful --what if something is wrong in the code --you can revert (ROLLBACK) to a previous version
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The HEAD (master) |
last commit snapshot, pointer to the current branch |
The Index |
proposed next commit snapshot |
The Working Directory |
sandbox (local machine) |
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<< some operations in GIT
operations for submitting or getting code to/from repository
commit = the code is read to submit to repository
push = pushes it to remote repository
pull = gets current code from remote repository
merge = if you are trying to push code that has been pushed more recently than you pulled it by another person -- the Git system will ask you to merge the files and clean up any descrepencies. ALSO - can be used to merge branch into master.
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scenario - you and Jill pull down the current code and you are both working on a file called doit.java. Jill pushes her changed code first. Then you try to push your code??? you could have changed the code in the same place --what is the system to do. You need to go through the process of merging the code and figuring out what conflicts might exist
operations for undoing/reverting to previous code
checkout = if you want to revert to a previous version BEFORE you have commited any changes
revert = if you want to undo a certain commit
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Sometimes you'll want to undo a certain commit. E.g. when you notice that your changes were wrong, when you introduced a bug, or simply when the customer has decided he doesn't want this anymore
reset = if you want to go to a previous version but, not remove the commits ---basically it resets the HEAD(master) to an older branch
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https://bitbucket.org/ for details (try setting up the tutorial example and download SourceTree as part of it). SourceTree can be found directly at http://sourcetreeapp.com/
Example on How to use SourceTree with a project
Just clone your project with sourcetree on your Desktop (e.g) then add your project to Eclipse
Right click on the Package Explorer -> Import -> Project Type*** -> "Existing *** Code Into Workspace" -> Select your folder project then click Finish.
STEP 1) create a repository on Bitbucket (a git repository service at bitbucket.com)
STEP 2) (one time only)setup Eclipse with eGit (software that lets you utilize GIT)
STEP 1.1: get a bitbucket account (bitbucket.org), then create a repository (Repository->Create Repository)
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follow the instructions to setup a repository on bitbucket and go through initializing it as suggested
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STEP 1.2: Log in -- under your overview tab you will see all repositories you are part of.
NOTE: if you hold your mouse over a repository it will tell you the URL of it (e.g. http://bitbucket.org/grewe/Tutorial)
STEP 2: Launch Eclipse, then do Help->Install New Software
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click the add button , the type in the url shown below
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select Eclipse Git Team Provider and JGit
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NOTE: when it goes to install EGit it may require you need to install other sw, just let the system do what it recomends.
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