Low Level Git

Transcript

1. Low-level Git
2. Why Low-level Git • GitͷίΞͷ΄͏ͷ࿩ • ͳΜͱͳ͘Ͱ࢖͍ͬͯͨίϚϯυ͕
 Θ͔͖ͬͯͨ • ௐ΂ͯͨΒ͍Ζ͍Ζ͓΋͠Ζ͔ͬͨ
3. Start!!
4. Git Objects
5. > git init
6. > ls .git
7. > find .git/objects
8. create first commit
9. > ls .git/objects
10. 3 Objects...? • Commit (f7a253e) • .git/objects/f7/a253ed90a5bb56d6cd8b3580485a7ae23acc88 • ??? (05934ea) • .git/objects/05/934ea69782016b0fbaa7bf46d574cefb039958 • ??? (802992c) • .git/objects/80/2992c4220de19a90767f3000a79a31b98d0df7
11. > git cat-file -t {sha1}
12. Commit/Tree/Blob • Commit (f7a253e) • .git/objects/f7/a253ed90a5bb56d6cd8b3580485a7ae23acc88 • Tree (05934ea) • .git/objects/05/934ea69782016b0fbaa7bf46d574cefb039958 • Blob (802992c) • .git/objects/80/2992c4220de19a90767f3000a79a31b98d0df7
13. Commit? Tree? Blob?
14. > git cat-file commit
15. Commit has... • Reference to ‘a’ Tree Object • Author & Committer • Commit Message ! • (Reference(s) to parent)
16. > git ls-tree
17. Tree has... • Reference to Blob Objects • & File name • & File Permission ! • (Reference to Tree Objects)
18. > git cat-file blob
19. Blob is... • commited file • don’t have a file name
21. merge commit
22. commit has a parent
23. merge commit has parents
25. Question?
26. Reference
27. • alias to commits • ex) • HEAD • master • some_branch • origin/master Reference?
28. Where is Branchs?
29. Where is the HEAD?
30. HEAD -> ref -> commit
32. Question?
33. Reference • ࣮ફ Git - ௿Ϩϕϧʹ஌Δ Git • http://www.slideshare.net/youhei/ git-12695573 • ʲ຋༁ʳGitΛϘτϜΞοϓ͔Βཧղ͢ Δ • http://keijinsonyaban.blogspot.jp/2011/05/
34. appendix
35. example: rename
36. blob is not change