Git Without Puns
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This document summarizes an ALT.NET meetup presentation about Git and its core concepts: 1) Git is a distributed version control system originally created by Linus Torvalds to manage the Linux kernel source code as a replacement for BitKeeper. 2) Git uses a content-addressable filesystem to store objects like blobs (file contents), trees, commits, and tags in a compressed database for versioning code and files efficiently with deltas. 3) The basic Git workflow involves making local changes, staging files to the index, and committing snapshots of the changes to the repository along a branch lineage with parent commits.
![By date Caret parent
git ls-tree "master@{3 days ago}" git ls-tree my-branch^
git ls-tree master@{yesterday} git ls-tree my-branch^2
git ls-tree master@{2009-04-22} git ls-tree my-branch^^^^
By sequence Tilde parent
git ls-tree master@{3} git ls-tree my-branch~3 [^^^]
git ls-tree master~3^2~4
23](https://image.slidesharecdn.com/git-without-puns-090701205840-phpapp01/85/Git-Without-Puns-23-320.jpg)
Git Without Puns
- 1. --- +++ Chicago ALT.NET June 10th 2009 Sergio Pereira sergio@sergiopereira.com http://sergiopereira.com/blog @sergiopereira 1
- 2. Linux kernel development Linus Torvalds, mid-2005 Replaces BitKeeper Perl C 2
- 3. msysGit: wizard-style installer installer or macports packaged (apt, yum, rpm) 3
- 4. compile from source! 4
- 5. Git on Windows 5
- 6. 6
- 7. 1st class citizens Local or remote Low ceremony No politics, no conventions Branch, branch, branch 7
- 8. Download deltas Local merge (fast) No magic for conflicts Tracks change authors and committer 8
- 9. • HTTP, HTTPS • GIT • File system • SSH • rsync • patch files ;) 9
- 10. .git Git Object directory commands database Repository Compression High level (porcelain) Encryption Configuration Blobs References Trees Low level Commits (plumbing) Hooks Tags 10
- 11. • Secure Hash Algorithm • Global identity • Authenticity da9973c6f9600d90e64aac647f3ed22dfd692f70 11
- 12. BLOB using System.IO; public class Whatever { // … } 5,811 bytes d56210fee9133… 12
- 13. TREE blob web.config 4df3bb723… blob global.asax aee87dc6a… tree bin d1c4a7220… tree images 6f32f4409… … 301 bytes 61bcb4a4f922e… 13
- 14. COMMIT tree 4df3bb723… parent aee87dc6a… author Joe Dev <joe@acme.com> 2009-04-03 13:45 -0600 committer Zack Fu <zack@acme.com> 2009-04-07 09:03 -0800 Added ability to pay with international credit cards… 1,082 bytes cbc72a29fd… 14
- 15. TAG type commit object cbc72a29fd… name v1.9.23 tagger Zack Fu <zack@acme.com> 2009-04-06 17:56 -0800 This release contains the improvements made to… 221 bytes 836dd4aa… 15
- 16. Git Object Model 16
- 17. commit: cbc72a29… tree: 61bcb4a4… tree: 8e6ac483… d56210fe… ca579aa3… ef49a6c6… 17
- 18. commit: cbc72a29… commit: b3a90c64… parent tree: 61bcb4a4… tree: 4d5fee12… tree: 8e6ac483… d56210fe… tree: 385de46a… ca579aa3… ef49a6c6… 37bf5ee1… 18
- 19. working directory index master git add git commit git push origin/master 19
- 20. *D F E E E E D D D C C C C B B B B A A A A MERGE REBASE 20
- 21. Gitting Getting to work 21
- 22. SHA fragment Remote name git cat-file commit a6ed git log origin/master git log refs/remotes/origin/master Branch name Tag name git log some-branch git log v2.2.5 git log refs/heads/some-branch git log refs/tags/v2.2.5 22
- 23. By date Caret parent git ls-tree "master@{3 days ago}" git ls-tree my-branch^ git ls-tree master@{yesterday} git ls-tree my-branch^2 git ls-tree master@{2009-04-22} git ls-tree my-branch^^^^ By sequence Tilde parent git ls-tree master@{3} git ls-tree my-branch~3 [^^^] git ls-tree master~3^2~4 23
- 24. Natural dev2 dev1 dev4 dev3 24
- 25. Central Repo dev2 dev1 shared dev4 dev3 25
- 26. Benevolent blessed Dictator dev1 boss dev2 lead1 dev3 lead2 dev4 26
- 27. Integration dev1 dev1' Manager boss' boss dev2 dev2' dev3 dev3' 27
- 28. GitHub: Social Forking 28
- 29. 29
- 30. (see you next month to learn more about Fluent NHibernate) 30