Prof. Dr. Marko Boger. Prof. Dr. Christian Johner. Version Management

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1 Prof. Dr. Marko Boger Prof. Dr. Christian Johner Version Management

2 Learning objectives Know problems a version control system can solve Master terms such as Check-out, commit, merge, pull, fetch, Master, Branch, Tag, push, Repository, Index, Staging Area Explain differences between central and decentral version control systems Perform basic workflows with git

3 PART 1: PROBLEM

4 Problem 1: Manage Changes

5 File History Version 1, Version 2 Version 1, Version 2, Version 3 Version 1 Version 1, Version 2, Version 3, Version 4 IOD Patient Series Study t 0 Version 1 t 1 > t 0 Version 1 Version 1 Version 1 t 2 > t 1 Version 1 Version 2 Version 1 Version 1 t 3 > t 2 Version 1 Version 2 Version 1 Version 2 t 4 > t 3 Version 2 Version 2 Version 1 Version 3 t 5 > t 4 Version 2 Version 3 Version 1 Version 4

6 A Naive Approach Copy entire project IOD Patient Series Study t 0 Version 1 t 1 > t 0 Version 1 Version 1 Version 1 t 2 > t 1 Version 1 Version 2 Version 1 Version 1 t 3 > t 2 Version 1 Version 2 Version 1 Version 2 t 4 > t 3 Version 2 Version 2 Version 1 Version 3 t 5 > t 4 Version 2 Version 3 Version 1 Version 4 V1.0 V1.1 Simple, but disk space consumption V1.0 V1.1

7 Problem 2: Working in many releases in parallel Windows 6 Vista Windows 7 Windows 8 Windows 10 Windows 11

8 Problem 2: Working in many releases in parallel The calculation of age is wrong, please correct!

9 Problem 3: Working in Teams Johann Svenja Robert What is THE version?

10 Problem 3: Working in Teams Johann Svenja Robert

11

12 The version that is saved first will be overwritten Pessimistic Lock How to realize an UNDO?

13

14 PART 2: TERMINOLOGY AND SOLUTION APPROACHES

15 Ansatz 1: No local copies Johann Svenja Robert No Offlinework possible

16 Simple Approach 1: Wikipedia

17 Simple Approach 1: Wikipedia You can see who changed what and when

18 Simple Approach 1: Wikipedia

19 Approach 2: Central repository and local workspace Working Copy: Files of a project locally on a developer s machine Repository: Database that stores all versions of all files

20 Terms: Check-out, commit Check-out commit Check-out: Copy files initially to local workspace Commit: Save changes in workspace to repository

21 Terms: Check-out, commit Check-out Check-out Commit Commit

22 Merging: Bringing together different versions of a file Term: Merge

23 Term: Merge GUI Editor

24 Term: Merge Merge Conflict

25 Term: Update Check-out Check-out Update Update Update: Updating files with in local workspace with files from repository

26 Term: Revision Commit Commit Revision: Unique number that is incremented with every single commit

27 Terms: Revision und Tag Revision IOD Patient Series Study t 0 0 Version 1 t 1 > t 0 1 Version 1 Version 1 Version 1 t 2 > t 1 2 Version 1 Version 2 Version 1 Version 1 t 3 > t 2 3 Version 1 Version 2 Version 1 Version 2 t 4 > t 3 4 Version 2 Version 2 Version 1 Version 3 t 5 > t 4 5 Version 2 Version 3 Version 1 Version 4 Tag: Label of a revision. A tag can include a name and other meta data.

28 Terms:: Branches, Trunk, Master A VCS should be smarter than just copying files V 1.0 V 1.1 Branch V 2.0 V 2.1 Branch Trunk oder Master: The first and automatically created branch Trunk, Master

29 Ter,s: Branches, Revisions, Tags, Merge V 1.0 V 1.1 Branch V 2.0 V 2.1 Branch Merge Merge Trunk, Master

30 Terms: Branches, Revisions, Tags, Merge A working copy belongs to one branch V 1.0 V 1.1 Branch V 2.0 V 2.1 Branch Trunk, Master

31 PART 3: CENTRAL AND DECENTRAL SYSTEMS

32 Central Repository commit Workspace Remote Repository*) check-out *) including version history

33 Decentral Repositories commit push Workspace Local Repository*) Remote Repository*) pull check-out fetch *) including version history

34 Decentral Repositories (git) commit -a add commit push Workspace Index (staging area) Local Repository*) Remote Repository*) pull check-out HEAD fetch check-out *) including version history

35 PART 4: WORKING WITH GIT

36 See digital white board

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