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Git の内部データ構造

Avatar for Shuhei Kagawa Shuhei Kagawa
August 20, 2015
Programming
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Git の内部データ構造

Git がどのようにデータを保持しているかについて解説します。

Avatar for Shuhei Kagawa

Shuhei Kagawa

August 20, 2015
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Transcript

  1. (JUͷ಺෦σʔλߏ଄ 4IVIFJ,BHBXB .5FDI5BML

  2. MTHJU '&5$)@)&"% )&"% DPOpH EFTDSJQUJPO IPPLT JOEFY JOGP MPHT PCKFDUT

    QBDLFESFGT SFGT

  3. USFFHJUPCKFDUT HJUPCKFDUT ᵓᴷᴷ ᴹᵋᴷᴷDGBFCCFG⒎DGFCGC ᵓᴷᴷ ᴹᵋᴷᴷCECBFDBFFFD⒎FG ᴹᵋᴷᴷEECCFBFECFDEB ᵓᴷᴷF ᴹᵋᴷᴷFFBFBEGGFCDFGD ᵓᴷᴷFC

    ᴹᵋᴷᴷGGGFGEGECBBCBBGCFBCF ᵓᴷᴷJOGP ᵋᴷᴷQBDL

  4. HJUPCKFDUT w ϑΝΠϧγεςϜΛར༻ͨ͠,FZ7BMVF4UPSFɻ w Ωʔ͸஋ͷ4)"ϋογϡɻ্ܻʢCZUFʣ͕ σΟϨΫτϦ໊ɺ࢒Γ͕ϑΝΠϧ໊ɻ  DGBFCCFG⒎DGFCGC σΟϨΫτϦ໊ CZUF

    ϑΝΠϧ໊ CZUF

  5. PCKFDUͷछྨ CMPC USFF DPNNJU ϑΝΠϧͷத਎ σΟϨΫτϦ ͷΑ͏ͳ΋ͷ ͍ΘΏΔίϛοτ

  6. PCKFDUͷߏ଄ CMPC  a QVUT)FMMP 8PSMEaO PCKFDUͷ छྨ ۭന αΠζ

    ψϧ จࣈ σʔλ 4)"ϋογϡ ϑΝΠϧ໊ ϑΝΠϧͷத਎ [MJCѹॖ ϔομ

  7. HJUDBUpMFQTIBIBTI

  8. CMPC QVUT)FMMP 8PSMEaO w ϑΝΠϧͷத਎ʮ͚ͩʯ͍࣋ͬͯΔɻ w ϑΝΠϧͷ໊લ͸͍࣋ͬͯͳ͍ɻ

  9. USFF IFMMPKTa4)"ϋογϡʢόΠφϦʣ IFMMPSCa4)"ϋογϡʢόΠφϦʣ w USFFͱCMPCͷҰཡɻ w ֤ߦ͸໊લ΍ϞʔυʢύʔϛογϣϯʣΛ͍࣋ͬͯΔɻ w ຊ౰͸վߦͳ͠ɻ

  10. DPNNJU USFFFBGD⒎FBBDFDDGEF BVUIPS4IVIFJ,BHBXBTIVIFJLBHBXB!HNBJMDPN  DPNNJUUFS4IVIFJ,BHBXBTIVIFJLBHBXB!HNBJMDPN  )FMMP 8PSME w USFF΁ͷࢀরΛҰ͍ͭ࣋ͬͯΔɻ

    w ͋ͱ͸ॻ͍ͨਓͱίϛοτͨ͠ਓɺίϛοτϝοηʔδɻ

  11. ֤PCKFDUͷؔ܎ CMPC USFF DPNNJU  CMPC IFMMPSC (FNpMF *OJUJBMDPNNJU

  12. ֤PCKFDUͷؔ܎ CMPC USFF DPNNJU  DPNNJU  USFF CMPC IFMMPSC

    (FNpMF USFF MJC IFMMPSC (FNpMF *OJUJBMDPNNJU IFMMPSCΛMJC ʹೖΕͨ

  13. ֤PCKFDUͷؔ܎ CMPC USFF DPNNJU  DPNNJU  DPNNJU  USFF

    USFF CMPC IFMMPSC (FNpMF USFF CMPC MJC MJC IFMMPSC (FNpMF (FNpMF *OJUJBMDPNNJU IFMMPSCΛMJC ʹೖΕͨ ར༻ϥΠϒϥϦ Λߋ৽

  14. Θ͔Δ͜ͱ w DPNNJU͚ͩͰ͸ͳ͘CMPC USFF΋4)"ϋογϡ Λ͍࣋ͬͯΔɻ w มΘΒͳ͍CMPC USFF͸USFF DPNNJUؒͰڞ༗͞Ε Δɻ

    w ϑΝΠϧɾσΟϨΫτϦ໊͸CMPC USFFࣗ਎Ͱ͸ͳ ͘਌ͷUSFF͕͍࣋ͬͯΔɻ

  15. HJUSFGT w HJUSFGTIFBETNBTUFSͱ͔HJUSFGTUBHTWͱ͔ɻ w DPNNJUͷ4)"ϋογϡ͕ॻ͍ͯ͋Δ͚ͩɻ

  16. HJUJOEFY w ࣍ͷDPNNJUʢͷUSFFʣΛ࡞ΔͨΊͷ৘ใ͕Ωϟογϡ͞Ε͍ͯΔɻ w มߋ͞ΕͨϑΝΠϧ͚ͩͰ͸ͳ͘શϑΝΠϧ͕ೖ͍ͬͯΔɻ w HJUMTpMFTͰ͸ݟ͑ͳ͍͕ɺ࠷ऴߋ৽೔࣌ͳͲ΋ೖ͍ͬͯΔɻ HJUMTpMFTTUBHF DDGEFECGCDBFDBECDCIFMMPKT D⒎BBFGDEEBGCE

    IFMMPSC

  17. ͦ͏͍͑͹ɾɾɾ w େ͖ͳϑΝΠϧʹҰߦ଍ͨ͠ΒɺผͷCMPC͕Ͱ͖ Δɻ w ͋Εɺ(JUͬͯϑΝΠϧΛࠩ෼Ͱ࣋ͬͯͳ͍ͷʁ

  18. HJUHD

  19. CFGPSF HJUPCKFDUT ᵓᴷᴷ ᴹᵋᴷᴷDGBFCCFG⒎DGFCGC ᵓᴷᴷ ᴹᵋᴷᴷDEBGEBFGDE ᵓᴷᴷ ᴹᵋᴷᴷCECBFDBFFFD⒎FG ᵓᴷᴷC ᴹᵋᴷᴷGFGFCECBFFGBFC

    ᵓᴷᴷDD ᴹᵋᴷᴷGEFECGCDBFDBECDC ᵓᴷᴷE ᴹᵋᴷᴷGCDDEDEGDGFG ᵓᴷᴷEC ᴹᵋᴷᴷEECCFBFECFDEB ᵓᴷᴷF ᴹᵋᴷᴷFFBFBEGGFCDFGD ᵓᴷᴷFB ᴹᵋᴷᴷGD⒎FBBDFDDGEF ᵓᴷᴷFC ᴹᵋᴷᴷGGGFGEGECBBCBBGCFBCF ᵓᴷᴷJOGP ᵋᴷᴷQBDL HJUPCKFDUT ᵓᴷᴷJOGP ᴹᵋᴷᴷQBDLT ᵋᴷᴷQBDL ᵓᴷᴷQBDLFDGDGBFBBGBCFECFGGJEY ᵋᴷᴷQBDLFDGDGBFBBGBCFECFGGQBDL BGUFS

  20. 1BDLpMF w JEYͱQBDLͷϖΞɻQBDL͕ຊମͰJEY͕ΠϯσοΫ εɻ w ෳ਺ͷPCKFDU͕٧Ίࠐ·Ε͍ͯΔɻ w ඞཁʹԠͯ͡CMPCΛࠩ෼Ͱอ࣋ɻ w HJUWFSJGZQBDLWHJUPCKFDUTQBDLQBDLYYYJEYͰϦε

    τ͕ݟΕΔɻ

  21. QMVNCJOHDPNNBOET w HJUDBUpMF w HJUMTUSFF HJUNLUSFF HJUDPNNJUUSFF w HJUSFBEJOEFY HJUXSJUFJOEFY

    HJUDPNNJUJOEFY

  22. ࢀߟ w 1SP(JU(JU*OUFSOBMT
 IUUQTHJUTDNDPNCPPLFOW w (JU$PNNVOJUZ#PPL*OUFSOBMTBOE1MVNCJOH
 IUUQTTDIBDPOHJUIVCJPHJUCPPLJOEFYIUNM w HJU%PDVNFOUBUJPOUFDIOJDBM
 IUUQTHJUIVCDPNHJUHJUUSFFNBTUFS%PDVNFOUBUJPOUFDIOJDBM