なぜGitでバイナリファイルをおいてはいけないかGitの内部構造から考える

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1. ͳͥGitͰόΠφϦϑΝΠ ϧΛ͓͍ͯ͸͍͚ͳ͍͔ Gitͷ಺෦ߏ଄͔Βߟ͑Δ 2017/08/31 kondo takeshi
2. Git͓͡͞Μ
3. ΅͘ʮ͜Εยํ͍Βͳ͘ͳ͍ʁ ফͦ͏Αʯ ͱ͋ΔHJUϦϙδτϦ
   @QBUDI
   @QBUDI
   
   
4. ޙഐ͘Μʮ͑ʔʁফ͢ΜͰ͢ ͔ʔʁԿ͔ා͍ͬ͢oldͰ͍͍ Ͱ͔͢ʔʁʯ
5. ΅͘ʮGit͕֮͑ͯͯ͘ΕΔ͔ Βʂʂʂʂʂʂoldͱ͔΍Ί Ζʂʂʂʂʂʂʂʂʂʂʯ
6. ͳΜͱ͔खॱॻ_draft.docx
7. ΅͘ʮdraft͸ϒϥϯν੾ͬͯ ΍ΕΑʂʂʂʂʂͬ͞͞ͱ rename͠Ζʂʂʂʂʂʯ
8. νʔϜ಺ͷGitྗ޲্͕՝୊ • Git͸ϑΝΠϧαʔό͡Όͳ͍ʂʂʂ • master௚push΍ΊΖʂʂʂ • खॱॻϨϏϡʔϓϩηεΛMRͰ΍Γ͍ͨɻɻ • ->ͭ·Γdiff͕͏·͘ग़ͳ͍WordΛ͜Ζ͢
9. $ git init > Initialized empty Git repository in /Users/take/ gitlab/.git/
10. $ ls .git > HEAD config description hooks info objects refs
11. .gitɺ͋Γ·͢Ͷʁ
12. .gitɺ͋Γ·͢Α
13. .git • Git͸͢΂ͯͷ؅ཧ৘ใΛ.gitҎԼʹू໿ • .gitͷதΛݟ͍ͯ͘͜ͱͰɺͲ͏΍ͬͯόʔ δϣϯ؅ཧΛ࣮ݱ͍͔ͯ͘͠ݟ͍ͯ͘
14. gitͷΦϒδΣΫτ CMPC ϑΝΠϧͷσʔλ USFF CMPC΁ͷࢀরͱɺ
    ֊૚෼ͷσΟϨΫτϦ৘ใ DPNNJU มߋ࣌ͷϝλσʔλͱɺ
    USFF΁ͷࢀর UBH DPNNJU΁ͷࢀর
15. gitͷΦϒδΣΫτ GitӳจϚχϡΞϧΛಡΉͨΊͷ༧උ஌ࣝ
 http://tokkonopapa.github.io/blog/2012/01/17/prior-knowledge-for-git-manual/
16. ςΩετϑΝΠϧͷ৔߹ $ echo "hello git" > hello_git.txt $ git add hello_git.txt $ git commit -m "hello git” [master (root-commit) aaa6ce7] hello git 1 file changed, 1 insertion(+) create mode 100644 git_test/hello_git.txt > Ҏ߱͸σϞͰʂ
17. όΠφϦϑΝΠϧͷ৔߹ ը૾ϑΝΠϧͷมߋ > Ҏ߱͸σϞͰʂ https://pixlr.com/editor/
18. εφοϓγϣοτ΍Μʂ ࠩ෼؅ཧ͡Όͳ͍΍Μʂ
19. git gc
20. git-gcͱpackfile • git-gcʹΑΓطଘͷΦϒδΣΫτ͸࡟আ͞Εɺ pack-*.idxͱpack-*.packϑΝΠϧ͕ੜ੒ • ͨͿΜ͜͜Ͱdeltaѹॖͯ͠Δ
21. େ༰ྔϑΝΠϧΛߋ৽ͯ͠ΈΔ $ sec 1 10000000 > sec.txt $ git gc Counting objects: 18, done. Delta compression using up to 4 threads. Compressing objects: 100% (14/14), done. Writing objects: 100% (18/18), done. Total 18 (delta 3), reused 11 (delta 0) > Ҏ߱͸σϞͰʂ
22. όΠφϦϑΝΠϧͷԿ͕μϝʁ • ୯ʹdiff͕ݟΕͳ͍ • merge࣌ʹconflict͢Δͱࢮ͵ • ࠩ෼͕ଟ͘ग़ΔՄೳੑ͕͋ΔͷͰɺpackʹΑ Δѹॖޮ཰͕ѱ͍
23. ·ͱΊ • ຊ౰ʹͯ͠͸͍͚ͳ͍ͷ͸ʮڊେόΠφϧϑΝΠϧʯ ͷadd • -> Git LFS΁Ͳ͏ͧ • commit͸εφοϓγϣοτ(blog)Λੜ੒͠ɺpackͰ ࠩ෼อଘʹΑΔѹॖ • ͦΕҎ֎͸શͯࢀরͷϦϨʔ
24. ͓·͚ɿWord͸όΠφϦͱ͍ ͏Θ͚Ͱ͸ͳ͍ • Wordͷத਎͸zip͞Εͨxml • ͔ͩΒgitͰdiffͱΔͱԿ͔͠Βݟ͑Δ • ࢀߟɿWord͞Μ͸ࠓ೔΋͓͔ͭΕͰ͢ • http://qiita.com/kaityo256/items/ c15889dbb7acb2632c6e
25. Reference • ΤϯδχΞͷͨΊͷGitͷڭՊॻʦ্ڃฤʧ Git಺෦ͷ࢓૊ΈΛཧղ͢Δ • https://www.amazon.co.jp/exec/obidos/ASIN/B01AAIN85K/ takeshe11-22/ • ʮΤϯδχΞͷͨΊͷgitڭՊॻʯ͔Βgitͷ಺෦ߏ଄ΛֶͿɹ࣮ફฤͦͷ1 • http://take-she12.hatenablog.com/entry/2017/08/10/120000 • ʮΤϯδχΞͷͨΊͷgitڭՊॻʯ͔Βgitͷ಺෦ߏ଄ΛֶͿɹ࣮ફฤͦͷ2 • http://take-she12.hatenablog.com/entry/2017/08/12/120000