Distributed Version Control Systems

Feb 24, 2010Download as KEY, PDF3 likes1,071 views

On 19 February I held a presentation for my colleagues about distributed version control systems (DVCS). My main goal was to inform them on what I think is the next logical step in source control. Also see http://vlent.nl/weblog/2010/02/25/distributed-version-control-systems-presentation

Distributed Version
Control Systems
A short introduction
19 February, 2010

Outline
• Goals
• What is DVCS anyway?
• What are the disadvantages?
• What are the advantages?
• How do I interface with Subversion?

Goals

• Inform about DVCS

• Not trying to force a
change!

DVCS in 5 minutes
Flexible workﬂow

dev prod

DVCS in 5 minutes

• Complete local copy of the repository
• Most common actions don’t need network
• Private branches

DVCS in 5 minutes

• Most popular:
• Bazaar
• Git
• Mercurial

Disadvantages

• More complex to learn/use
• New or redeﬁned terminology
• No partial clones so one repo per project
• Easier to crawl into a cave

Advantages

• Local commits (easier to experiment)
• FAST!
• Cleaner working copy (no .svn dirs)
• Working copy svn same size as full history
• Code review local commits before push

Advantages

• Cooperation without commits to central
repo
• Better merging, thus low barrier for
branching
• Commit before merge instead of merge
before commit

Branching
release

“trunk”

branch

branch

bugﬁx

Branching

“trunk”

branch

branch

feature X

Merge before commit
remote local

update

run tests; no errors

Merge before commit
remote local

update

run tests; no errors

write code

run tests; no errors

Merge before commit
remote local

update

run tests; no errors

write code

run tests; no errors

update + solve conﬂicts

Merge before commit
remote local

update

run tests; no errors

write code

error in run tests; no errors
commit?
error in
update + solve conﬂicts
merge?

run tests; errors

Commit before merge
remote local

update

run tests; no errors

Commit before merge
remote local

update

run tests; no errors

write code

run tests; no errors

make local commit

Commit before merge
remote local

update

run tests; no errors

write code

run tests; no errors

make local commit

update + solve conﬂicts

Commit before merge
remote local

update

run tests; no errors

write code

error in run tests; no errors
commit?
make local commit

error in
update + solve conﬂicts merge?

run tests; errors

Commit before merge
remote local

update

run tests; no errors

write code
Revert to
run tests; no errors
working commit
make local commit and try again

How I use git-svn
svn buildout
src
theme
policy

How I use git-svn
svn buildout
src
theme
policy

$ git svn clone -s <buildout-url>

git buildout
src
theme
policy

How I use git-svn
svn buildout
src
theme svn:external
policy svn:external

How I use git-svn
svn buildout
src
theme svn:external
policy svn:external

$ git svn clone -s <buildout-url>
$ git-ext-svn-clone

git buildout
src
theme git
policy git

How I use git-svn
svn

master

branch

feature X

How I use git-svn
other commits
svn

master

branch

feature X

How I use git-svn
svn

fetch + rebase

master

feature X

How I use git-svn
svn

master

rebase

feature X

How I use git-svn
svn

master

merge

feature X

How I use git-svn
svn

dcommit (push)

master

How I use git-svn

• Unsolved problem: how to use git-svn
when buildout uses:
• infrae.subversion ?
• mr.developer ?

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Distributed Version Control Systems

1. Distributed Version Control Systems A short introduction 19 February, 2010

2. Outline • Goals • What is DVCS anyway? • What are the disadvantages? • What are the advantages? • How do I interface with Subversion?

3. Goals • Inform about DVCS • Not trying to force a change!

4. DVCS in 5 minutes Flexible workﬂow

5. DVCS in 5 minutes Flexible workﬂow

6. DVCS in 5 minutes Flexible workﬂow

7. DVCS in 5 minutes Flexible workﬂow

8. DVCS in 5 minutes Flexible workﬂow dev prod

9. DVCS in 5 minutes • Complete local copy of the repository • Most common actions don’t need network • Private branches

10. DVCS in 5 minutes • Most popular: • Bazaar • Git • Mercurial

11. Disadvantages • More complex to learn/use • New or redeﬁned terminology • No partial clones so one repo per project • Easier to crawl into a cave

12. Advantages • Local commits (easier to experiment) • FAST! • Cleaner working copy (no .svn dirs) • Working copy svn same size as full history • Code review local commits before push

13. Advantages • Cooperation without commits to central repo • Better merging, thus low barrier for branching • Commit before merge instead of merge before commit

14. Cooperation

15. Cooperation

16. Cooperation

17. Branching “trunk”

18. Branching “trunk” branch feature X

19. Branching “trunk” branch feature X

20. Branching “trunk” branch feature X

21. Branching “trunk” branch branch

22. Branching “trunk” branch branch

23. Branching “trunk” branch feature X

24. Branching release “trunk” branch branch bugﬁx

25. Branching “trunk” branch branch feature X

26. Merge before commit remote local update run tests; no errors

27. Merge before commit remote local update run tests; no errors write code run tests; no errors

28. Merge before commit remote local update run tests; no errors write code run tests; no errors update + solve conﬂicts

29. Merge before commit remote local update run tests; no errors write code error in run tests; no errors commit? error in update + solve conﬂicts merge? run tests; errors

30. Merge before commit remote local update run tests; no errors write code error in run tests; no errors commit? error in update + solve conﬂicts merge? run tests; errors No commit to revert to!

31. Commit before merge remote local update run tests; no errors

32. Commit before merge remote local update run tests; no errors write code run tests; no errors make local commit

33. Commit before merge remote local update run tests; no errors write code run tests; no errors make local commit update + solve conﬂicts

34. Commit before merge remote local update run tests; no errors write code error in run tests; no errors commit? make local commit error in update + solve conﬂicts merge? run tests; errors

35. Commit before merge remote local update run tests; no errors write code Revert to run tests; no errors working commit make local commit and try again

36. How I use git-svn svn buildout src theme policy

37. How I use git-svn svn buildout src theme policy $ git svn clone -s <buildout-url> git buildout src theme policy

38. How I use git-svn svn buildout src theme svn:external policy svn:external

39. How I use git-svn svn buildout src theme svn:external policy svn:external $ git svn clone -s <buildout-url> $ git-ext-svn-clone git buildout src theme git policy git

40. How I use git-svn svn

41. How I use git-svn svn clone master

42. How I use git-svn svn master branch feature X

43. How I use git-svn other commits svn master branch feature X

44. How I use git-svn svn fetch + rebase master feature X

45. How I use git-svn svn master rebase feature X

46. How I use git-svn svn master merge feature X

47. How I use git-svn svn dcommit (push) master

48. How I use git-svn • Unsolved problem: how to use git-svn when buildout uses: • infrae.subversion ? • mr.developer ?

49. Questions? Tips?

Distributed Version Control Systems

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