Version Control Using Subversion. 12 May 2013 OSU CSE 1

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Alexandra Dawson
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1 Version Control Using Subversion 12 May 2013 OSU CSE 1

2 Version Control In team projects, software engineers: Share and extend a common code base (and comply with standards, coding conventions, comment templates, ) Work concurrently with each other Best practice is for a team to use a version control system We will use one called Subversion, but others are essentially similar 12 May 2013 OSU CSE 2

3 Version Control This is not limited to code! A version control system can handle non-code files as well, which In team projects, software engineers: Share and extend a common code base (and comply with standards, makes coding it handy conventions, for other sorts of team projects, too. comment templates, ) Work concurrently with each other Best practice is for a team to use a version control system We will use one called Subversion, but others are essentially similar 12 May 2013 OSU CSE 3

4 Key Idea: The Repository A central keeps all files (in our case, Java code) and a history of all modifications to them A new team member can check out their own private copy from the Each member can their own copy to reflect the latest changes in the Each member can changes from their own private copy to the 12 May 2013 OSU CSE 4

5 Workflow Model: An Example 12 May 2013 OSU CSE 5

6 How Work Gets Done Repository holds master copy of all files Never edited directly Stores complete history, too! Each team member has a local copy (or working copy) in their own workspace All file creation, editing, deletion occurs here Update and commands are used to synchronize local and master copies 12 May 2013 OSU CSE 6

7 The Optimistic Model Any team member can modify their local copy of any file at any time No locking or other synchronization among team members takes place on local copies On an, the latest version from the often can be merged automatically into the local copy This is especially so when team members edit different files, so conflicts are rare 12 May 2013 OSU CSE 7

8 12 May 2013 OSU CSE 8

9 does an to get the latest version to work on. 12 May 2013 OSU CSE 9

10 does an to get the latest version to work on. 12 May 2013 OSU CSE 10

11 does a to put his latest edits into the. 12 May 2013 OSU CSE 11

12 does an to get the latest version before she s. 12 May 2013 OSU CSE 12

13 The latest revision in the is merged into s copy. Merge 12 May 2013 OSU CSE 13

14 Suppose this merge is successful; then s. Merge 12 May 2013 OSU CSE 14

15 tries to more changes, but has not d recently. Merge 12 May 2013 OSU CSE 15

16 has ted recently, and may not do so now. Merge Error: working version out-of-date 12 May 2013 OSU CSE 16

17 needs to first. Merge Error: working version out-of-date 12 May 2013 OSU CSE 17

18 Suppose this merge has conflicts; then must resolve them. Merge Error: working version out-of-date Conflict: requires attention 12 May 2013 OSU CSE 18

19 After resolves conflicts, he can continue and his changes. Merge Error: working version out-of-date Conflict: requires attention 12 May 2013 OSU CSE 19

20 Meanwhile, s and continues with the latest version. Merge Error: working version out-of-date Conflict: requires attention 12 May 2013 OSU CSE 20

CPSC 491. Today: Source code control. Source Code (Version) Control. Exercise: g., no git, subversion, cvs, etc.)

CPSC 491. Today: Source code control. Source Code (Version) Control. Exercise: g., no git, subversion, cvs, etc.) Today: Source code control CPSC 491 Source Code (Version) Control Exercise: 1. Pretend like you don t have a version control system (e. g., no git, subversion, cvs, etc.) 2. How would you manage your source