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Git and GitHub at the San Francisco JUG

Matthew McCullough
June 09, 2012
Programming
3
210

Git and GitHub at the San Francisco JUG

Matthew McCullough of GitHub presented on why Java developers have so many reasons to explore Git and Git, including productivity gains, easy OSS contributions, the eGit Eclipse plugin, and JGit, the underlying Java cleanroom implementation that powers https://android.googlesource.com.

Matthew McCullough

June 09, 2012
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Transcript

  1. Why Java Devs Should Care About Git & GitHub at

    the San Francisco JUG by Matthew McCullough

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

  3. Matthew McCullough @matthewmccull

  4. None
  5. None
  6. None

  7. Git

  8. None

  9. “Cool kids” version control system

  10. Open Source

  11. bash scripts  C code

  12. ≉

  13. I'm an egotistical bastard, and I name all my projects

    after myself. First Linux, now git. -Linus Torvalds “ ”

  14. Git and Java

  15. Git and the JVM

  16. None
  17. None

  18. JGit

  19. Git in pure Java

  20. None
  21. None
  22. None

  23. Central Repo

  24. Blessed Repo

  25. Certified Repo Development Repo Continuous Integration Server

  26. ➡How to commit, branch and tag ➡How Git implements a

    new commit-referencing syntax ➡How to pull and push changes between repositories ➡How to set up a Git repository

  27. ➡How to set up a Git repository

  28. No daemon

  29. No special repo area

  30. > cd myproj > git init Initialized empty Git repository

    in /stuff/myproj/.git/
  31. None

  32. ➡How to commit, branch and tag ➡How Git implements a

    new commit-referencing syntax ➡How to pull and push changes between repositories ➡How to set up a Git repository

  33. ➡How to commit, branch and tag

  34. The three basics

  35. ➡How to commit

  36. > git add <FILENAME>

  37. > git status # On branch master # Initial commit

    # Changes to be committed: # (use "git rm --cached <file>..." to unstage) # new file: myfile.txt

  38. > git commit -m”<MESSAGE>” [master (root-commit) 498cc44] My first commit

    1 files changed, 5 insertions(+), 0 deletions(-) create mode 100644 myfile.txt

  39. Local Branches Remote Branches Upstream Branches Working Copy commit

  40. ➡How to branch

  41. > git branch <BRANCHNAME>

  42. Local Branches Remote Branches Upstream Branches Working Copy

  43. Local Branches Remote Branches Upstream Branches Working Copy

  44. > git checkout <BRANCHNAME> Switched to branch 'mybranch'

  45. Local Branches Remote Branches Upstream Branches Working Copy

  46. Local Branches Remote Branches Upstream Branches Working Copy

  47. ➡How to tag

  48. > git tag -a <TAGNAME> -m”<MESSAGE>”

  49. None

  50. ➡How to commit, branch and tag ➡How Git implements a

    new commit-referencing syntax ➡How to pull and push changes between repositories ➡How to set up a Git repository

  51. ➡How Git implements a new commit-referencing syntax

  52. None

  53. 9AB223D28B1AA46EF1780B22F304982E39872C34 <html> <body> <p>This is a test</p> <img src="http://ai.com/icon.gif"> </body>

    </html>

  54. 9AB223D28B1AA46EF1780B22F304982E39872C34 <html> <body> <p>This is a test</p> <img src="http://ai.com/icon.gif"> </body>

    </html>

  55. tree tree: 7e8b1 web blob: 9ab16 index.html a10b3 tree blob:

    8d162 logo.jpg blob: 51d22 draw.js 7e8b1 commit 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

  56. tree tree: 7e8b1 web blob: 9ab16 index.html a10b3 tree blob:

    8d162 logo.jpg blob: 51d22 draw.js 7e8b1 commit 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

  57. tree tree: 7e8b1 web blob: 9ab16 index.html a10b3 tree blob:

    8d162 logo.jpg blob: 51d22 draw.js 7e8b1 commit 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

  58. tree tree: 7e8b1 web blob: 9ab16 index.html a10b3 tree blob:

    8d162 logo.jpg blob: 51d22 draw.js 7e8b1 commit 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

  59. tree tree: 7e8b1 web blob: 9ab16 index.html a10b3 tree blob:

    8d162 logo.jpg blob: 51d22 draw.js 7e8b1 commit 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

  60. tree tree: 7e8b1 web blob: 9ab16 index.html a10b3 tree blob:

    8d162 logo.jpg blob: 51d22 draw.js 7e8b1 commit 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

  61. tree tree: 7e8b1 web blob: 9ab16 index.html a10b3 tree blob:

    8d162 logo.jpg blob: 51d22 draw.js 7e8b1 commit 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

  62. tree tree: 7e8b1 web blob: 9ab16 index.html a10b3 tree blob:

    8d162 logo.jpg blob: 51d22 draw.js 7e8b1 commit 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

  63. tree tree: 7e8b1 web blob: 9ab16 index.html a10b3 tree blob:

    8d162 logo.jpg blob: 51d22 draw.js 7e8b1 commit 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

  64. 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

  65. 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

  66. 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

  67. 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

  68. 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

  69. 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

  70. 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

  71. 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

  72. RELEASE_1.0 HEAD bug979branch commit c67db commit 9bd21 commit 1c2d7 commit

    8c2d1 commit 1bdcd commit 2daa1

  73. RELEASE_1.0 HEAD bug979branch commit c67db commit 9bd21 commit 1c2d7 commit

    8c2d1 commit 1bdcd commit 2daa1

  74. RELEASE_1.0 HEAD bug979branch commit c67db commit 9bd21 commit 1c2d7 commit

    8c2d1 commit 1bdcd commit 2daa1

  75. RELEASE_1.0 HEAD bug979branch commit c67db commit 9bd21 commit 1c2d7 commit

    8c2d1 commit 1bdcd commit 2daa1

  76. RELEASE_1.0 HEAD bug979branch commit c67db commit 9bd21 commit 1c2d7 commit

    8c2d1 commit 1bdcd commit 2daa1

  77. RELEASE_1.0 HEAD bug979branch commit c67db commit 9bd21 commit 1c2d7 commit

    8c2d1 commit 1bdcd commit 2daa1

  78. > git log commit 0fc27c73dea82a0576c6cf262fb517d24e75a223 Author: Matthew McCullough <[email protected]> Date:

    Mon Oct 24 10:42:20 2013 +0300 Performance enhancement of calc engine commit 7d946e814233814b1780ed1035da271cbb37206d Author: Matthew McCullough <[email protected]> Date: Mon Oct 24 12:59:41 2013 +0300 Translation to Esperanto
  79. None

  80. ➡How to commit, branch and tag ➡How Git implements a

    new commit-referencing syntax ➡How to pull and push changes between repositories ➡How to set up a Git repository

  81. ➡How to pull and push changes between repositories

  82. > git clone http://this.com/myproj.git Cloning into myproj... remote: Counting objects:

    3871, done. remote: Compressing objects: 100% (73/73), done. remote: Total 3871 (delta 51), reused 3853 (delta 36) Receiving objects: 100% (3871/3871), 297.88 KiB | 35 KiB/s, done. Resolving deltas: 100% (51/51), done. > cd myproj

  83. Local Branches Remote Branches Upstream Branches Working Copy clone clone

    clone

  84. > git push Counting objects: 16, done. Delta compression using

    up to 2 threads. Compressing objects: 100% (10/10), done. Writing objects: 100% (15/15), 1.37 KiB, done. Total 15 (delta 5), reused 0 (delta 0) To http://this.com/myproj.git 6128b94..7607971 master -> master

  85. Local Branches Remote Branches Upstream Branches Working Copy push push

    commit

  86. > git pull Updating 474f43d..7607971 Fast-forward sample5.htm | 1 +

    1 files changed, 1 insertions(+), 0 deletions(-) create mode 100644 sample5.htm

  87. Local Branches Remote Branches Upstream Branches Working Copy pull pull

    pull
  88. None

  89. Why Java Devs Should Care About Git & GitHub at

    the San Francisco JUG by Matthew McCullough

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