1. Revision Control Daniel Daugherty
11/21/2018

2. Introduction
This presentation will give an overview of Revision control
What is can be used for
Common Terms
Who and what can benefit from revision control software
How to implement revision control software.
11/21/2018

3. Agenda List the topics to be covered List the times allotted to each
11/21/2018

4. What is Revision Control
Revision Control software is software that keeps track of multiple version of one or more files.
Allows for retrieval of previous versions of a file(s)
Most provide the ability to provide a description of changes made in the version being checked in.
11/21/2018

5. Vocabulary
Repository: Place where a group of revision control files live.
Revision: A version of file or group of files.
Check-in: Sends a copy of the current file(s) to the repository. Which are then assigned a new revision.
Check-out: Retrieves and possibly locks the current file(s)
Merge: Action of taking 2 version of a file and combining the changes.
Branch: A separate copy of file to allow parallel development with in source control.
11/21/2018

6. Why use Revision Control
Prevent the Last to Save WINS situation
Provides a consistent and reliable method to keep copies of pervious versions of a file.
Keeps a log of who made changes and description of what changes were made.
Can allow development on multiple version of an application at the same time
Example Bug Fix for current production site/application
Development of new version
Last to save wins problem (multiple people working on the same file)
locking files
merging changes (in concurrent edit setups)
Maintaining Multiple version of an application
Example Mozilla
Support large application changes while still allowing mantiance of
existing application untill changes are complete.
Centeraly located storage of application
Can allow easy access to remote developers (if supported by
revesion control application)
11/21/2018

7. How to set up Revision Control
Chose what revision control software you are going to use.
Setup repository(s)
Setup Securtiy (if supported)
Install Client
Import files into repository
Update working directory
Checkout file(s) if using file locking
Edit
Commit Changes
11/21/2018

8. What can Revision Control be used for
Source Code
Configuration files
Requirement and Design documents
Marketing Material
Images *
Any type of file. *
* Binary file have some limitation with most revision control software.
11/21/2018

9. Locking files VS Concurrent Edit
great for hard to merge items (binary files).
Can cause conflict when multiple people need the same file.
requires connection to the repository to obtain a lock to allow editing
Concurrent editing
no conflict for control of a file for editing.
no connection to the repository needed to begin editing a file
If two edit occur on the same file a merge is required.
11/21/2018

10. Branching and Merging
Branching – Allows for two or more concurrent copies of code to exist in source control for a single application. For example -
The current Production version of a web site.
And the new 2005 version with new look and feel and increased feature set.
Merging: Merging as covered earlier allow different versions of files to be compared and the changes consolidated into a single new version. This functionality can also be used to bring changes from one branch to different branch.
Show Mozilla example branch file.
11/21/2018

11. Summary Revision control give you control over your documents
Can be used for any type of document
Many different types with different features and costs.
11/21/2018

12. Where to Get More Information
Comparison of different revision control software
Sub Version links
Subversion -
O’Reilly Sub version book -
Tortosise Client -
CVS resources
CVS -
Tortosise Client -
Essential CVS by O’Reilly
Component Software RCS –
11/21/2018