Migrating from Subversion to Git and GitHub

1. VERSION CONTROL REINVIGORATED from Subversion to Git and GitHub

2. VERSION CONTROL REINVIGORATED from Subversion to Git and GitHubfrom Subversion to Git and GitHub

3. @matthewmccull [email protected] github.com/training

4. Who is Matthew? Open source contributor Build tool and continuous delivery author 5 year Git evangelist VP of Training at GitHub

5. The Change

6. SVN ☞ GIT

10. — Every manager, ever If it isn't broke, don't fix it.

11. The Radar

14. July 2011 Technology Radar Prepared by the ThoughtWorks Technology Advisory Board http://www.thoughtworks.com/radar

15. July 2011 Technology Radar Prepared by the ThoughtWorks Technology Advisory Board http://www.thoughtworks.com/radar Tools 30. Subversion 31. Git 32. Infrastructure as code 33. Github 34. Caching reverse proxies 35. Splunk 36. Mercurial 37. Message buses without smarts 38. NoSQL 39. Next gen test tools 40. New Relic beyond Rails 41. TLB 42. Powershell 43. Selenium 2 testing of mobile websites 44. Deltacloud 45. Vagrant 46. API management services 47. jQuery Mobile 48. Backbone.js 49. Sonar 50. Open source bI tools 51. Gradle 52. Cross platform mobile toolkits 53. ESB 54. VCS with “implicit workflow” 55. Code in configuration 26 16 13 22 12 5 3 32 36 46 53 45 44 37 39 35 38 304 6 56 7669 58 57 7 15 14 25 29 28 27 21 23 17 19 24 18 20 11 9 2 10 31 33 42 41 40 50 47 48 49 51 54 43 55 52 34 1 8 New or Moved No change Techniques 1. Progressive enhancement 2. Automate database deployment 3. Platform roadmaps 4. Evolutionary database 5. Emergent design 6. Visualization and metrics 7. Coding architects 8. Evolutionary architecture 9. DevOps 10. Simple performance trending 11. Continuous delivery 12. Concurrency abstractions and patterns 13. Acceptance test of journeys 14. Categorization & prioritization of technical debt 15. Continuous deployment 16. Capability modeling 17. Thoughtful caching 18. Iterative data warehousing 19. Build your own radar 20. Event API’s 21. Event driven business intelligence 22. Smart systems 23. Event sourcing 24. Decision driven BI 25. Scrum certification 26. Database based integration 27. Procedure oriented integration 28. Feature branching 29. Manual infrastructure management

16. Tools 30. Subversion 31. Git 32. Infrastructure as code 33. Github 34. Caching reverse proxies 35. Splunk 36. Mercurial 37. Message buses without smarts 38. NoSQL 39. Next gen test tools 40. New Relic beyond Rails 41. TLB 42. Powershell 43. Selenium 2 testing of mobile websites 44. Deltacloud 45. Vagrant 46. API management services 47. jQuery Mobile 48. Backbone.js 49. Sonar 50. Open source bI tools 51. Gradle 52. Cross platform mobile toolkits 53. ESB 54. VCS with “implicit workflow” 55. Code in configuration 26 16 13 22 12 5 3 32 36 46 53 45 44 37 39 35 38 304 6 7 15 14 25 29 28 27 21 23 17 19 24 18 20 11 9 2 10 31 33 42 41 40 50 47 48 49 51 54 43 55 52 34 1 8 New or Moved No change Techniques 1. Progressive enhancement 2. Automate database deployment 3. Platform roadmaps 4. Evolutionary database 5. Emergent design 6. Visualization and metrics 7. Coding architects 8. Evolutionary architecture 9. DevOps 10. Simple performance trending 11. Continuous delivery 12. Concurrency abstractions and patterns 13. Acceptance test of journeys 14. Categorization & prioritization of technical debt 15. Continuous deployment 16. Capability modeling 17. Thoughtful caching 18. Iterative data warehousing 19. Build your own radar 20. Event API’s 21. Event driven business intelligence 22. Smart systems 23. Event sourcing 24. Decision driven BI 25. Scrum certification 26. Database based integration 27. Procedure oriented integration 28. Feature branching 29. Manual infrastructure management

17. Tools 30. Subversion 31. Git 32. Infrastructure as code 33. Github 34. Caching reverse proxies 35. Splunk 36. Mercurial 37. Message buses without smarts 38. NoSQL 39. Next gen test tools 40. New Relic beyond Rails 41. TLB 42. Powershell 43. Selenium 2 testing of mobile websites 44. Deltacloud 45. Vagrant 46. API management services 47. jQuery Mobile 48. Backbone.js 49. Sonar 50. Open source bI tools 51. Gradle 52. Cross platform mobile toolkits 53. ESB 54. VCS with “implicit workflow” 55. Code in configuration 26 16 13 22 12 5 3 32 36 46 53 45 44 37 39 35 38 304 6 7 15 14 25 29 28 27 21 23 17 19 24 18 20 11 9 2 10 31 33 42 41 40 50 47 48 49 51 54 43 55 52 34 1 8 New or Moved No change Techniques 1. Progressive enhancement 2. Automate database deployment 3. Platform roadmaps 4. Evolutionary database 5. Emergent design 6. Visualization and metrics 7. Coding architects 8. Evolutionary architecture 9. DevOps 10. Simple performance trending 11. Continuous delivery 12. Concurrency abstractions and patterns 13. Acceptance test of journeys 14. Categorization & prioritization of technical debt 15. Continuous deployment 16. Capability modeling 17. Thoughtful caching 18. Iterative data warehousing 19. Build your own radar 20. Event API’s 21. Event driven business intelligence 22. Smart systems 23. Event sourcing 24. Decision driven BI 25. Scrum certification 26. Database based integration 27. Procedure oriented integration 28. Feature branching 29. Manual infrastructure management

18. 26 16 13 22 12 5 3 32 36 46 53 45 44 37 39 35 38 304 6 56 74 7669 58 57 7 15 14 25 29 28 27 21 23 17 19 24 18 20 11 9 2 10 80 7560 31 33 42 41 40 50 47 48 49 51 54 43 55 52 34 1 8 Ne No ation & prioritization cal debt us deployment y modeling ul caching data warehousing

19. Migration Tools

20. git-svn

21. git-svn Core Git feature

22. $ git svn clone -s http://yourhost.com/reporoot/

23. git-svn Consumes an authors email mapping ﬁle

24. (no author) = Codehaus infra <[email protected]> sdevijver = Steven Devijver <[email protected]> markcc = Mark CC <[email protected]> joe = Joe <[email protected]> ajtarter = Aaron J Tarter <[email protected]> liddon = Lidia Donajczyk-Lipinska <[email protected]> jshickey = Scott Hickey <[email protected]> HamletDRC = Hamlet D'Arcy <[email protected]> aalmiray = Andres Almiray <[email protected]> blackdrag = Jochen Theodorou <[email protected]> bob = Boc McWhirter <[email protected]> brownj = Jeff Brown <[email protected]> cstein = Christian Stein <[email protected]>

25. git-svn Migrates Subversion tags to Git branches

26. svn2git

28. $ svn2git http://matthew.com/svnrepos/project1

29. importing to git

31. # Publish one branch $ svn2git http://matthew.com/svnrepos/project1 $ git remote add origin https://github.com/you/project1 $ git push origin master

32. # Publish all branches and tags $ svn2git http://matthew.com/svnrepos/svnproject1 $ git clone file://yourpath/svnproject1 gitproject1 $ cd gitproject1 $ git remote add origin https://github.com/you/project1 $ git push --mirror origin

33. Serving SVN from Git

35. $ svn co https://github.com/you/project1/trunk p1svn

36. Data Structures

37. — No engineer, ever Wow!Version control!

38. DAG

39. v1 v2 v3 v4 File A File B File C File A File B File B File C v5 File A File BFile B

40. v1 v2 v3 v4 File A File B File C File A File B File B File C v5 File A File BFile B Δ Δ Δ Δ ΔΔΔ

42. Checkin Checkin Checkin Checkin Checkin Checkin Checkin Checkin Checkin Checkin Checkin Delta storage gets slower as the history of a ﬁle gets longer

44. Copy of the entire tree per commit

45. Why?

46. v1 v2 v3 v4 File A File B File C File A File B File B File C v5 File A File BFile B File A File A File C File C File C

48. hard link to existing identical blobs

50. v1 v2 v3 v4 File A File B File C File A File B File B File C v5 File A File BFile B File A File A File C File C File Cß

51. zlib deﬂates each blob at commit

54. zlib deﬂates the entire repo

57. Act I 2100MBbecame 205MB

58. refs

59. centralized VCSs use sequential revision numbers

60. Git uses a SHA-1 hash

62. 40 hex characters (20 bytes)

63. 9AB223D28B1AA46EF1780B22F304982E39872C34

64. 9AB223D28B1AA46EF1780B22F304982E39872C34 <html> <body> <p>This is a test</p> <img src="http://ai.com/icon.gif"> </body> </html>

65. <html> <body> <p>This is a test</p> <img src="http://ai.com/icon.gif"> </body> </html> 9AB223D28B1AA46EF1780B22F304982E39872C34

66. ‣Blob ‣Tree ‣Commit ‣Tag

67. tree tree: 7e8b1 web blob: 9ab16 index.html a10b3 tree blob: 8d162 logo.jpg blob: 51d22 draw.js 7e8b1commit tree: a10b3 parent: nil author: Fird committer: Matthew message: Major refactoring of the web content. c67db blob<html> <body></body> </html> 9ab16 blob //Some more javascript var renderSize 51d22 blob 7D 8D B3 7F BD 12 9F E9 7B 78 9D 3F 5C A6 72 CB 8d162

76. v1 v2 v3 commit tree: 9a87b parent: nil author: Fird committer: Matthew message: Major refactoring of the Javascript rendering engine. c67db commit tree: b22c1 parent: c67db author: Tim committer: Fird message: Minor update to HTML 9bd21 commit tree: b22c1 parent: 9bd21 author: Johnny committer: Joe message: New language transations 1c2d7

84. RELEASE_1.0 HEAD bug979branch commit c67db commit 9bd21 commit 1c2d7 commit 8c2d1 commit 1bdcd commit 2daa1

90. Git Highlights

91. Local commits

92. Content Tracking

93. simpler Merges

94. Start now

95. git-svn conversion to Git git-svn bridge to SVN GitHub SVN URLs Conversion Options

97. Thanks!

98. @matthewmccull [email protected] github.com/training

Migrating from Subversion to Git and GitHub

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