Git の内部データ構造

Ca0ab6e450f894e06652ee257df9d647?s=47 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。

Ca0ab6e450f894e06652ee257df9d647?s=128

Shuhei Kagawa

August 20, 2015
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Transcript

  1. 1.

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

  2. 2.

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

    QBDLFESFGT SFGT
  3. 3.

    USFFHJUPCKFDUT HJUPCKFDUT ᵓᴷᴷ ᴹᵋᴷᴷDGBFCCFG⒎DGFCGC ᵓᴷᴷ ᴹᵋᴷᴷCECBFDBFFFD⒎FG ᴹᵋᴷᴷEECCFBFECFDEB ᵓᴷᴷF ᴹᵋᴷᴷFFBFBEGGFCDFGD ᵓᴷᴷFC

    ᴹᵋᴷᴷGGGFGEGECBBCBBGCFBCF ᵓᴷᴷJOGP ᵋᴷᴷQBDL
  4. 4.

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

    ϑΝΠϧ໊ CZUF
  5. 5.

    PCKFDUͷछྨ CMPC USFF DPNNJU ϑΝΠϧͷத਎ σΟϨΫτϦ ͷΑ͏ͳ΋ͷ ͍ΘΏΔίϛοτ

  6. 6.

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

    ψϧ จࣈ σʔλ 4)"ϋογϡ ϑΝΠϧ໊ ϑΝΠϧͷத਎ [MJCѹॖ ϔομ
  7. 7.

    HJUDBUpMFQTIBIBTI

  8. 8.

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

  9. 9.

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

  10. 10.

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

    w ͋ͱ͸ॻ͍ͨਓͱίϛοτͨ͠ਓɺίϛοτϝοηʔδɻ
  11. 11.

    ֤PCKFDUͷؔ܎ CMPC USFF DPNNJU  CMPC IFMMPSC (FNpMF *OJUJBMDPNNJU

  12. 12.

    ֤PCKFDUͷؔ܎ CMPC USFF DPNNJU  DPNNJU  USFF CMPC IFMMPSC

    (FNpMF USFF MJC IFMMPSC (FNpMF *OJUJBMDPNNJU IFMMPSCΛMJC ʹೖΕͨ
  13. 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. 14.

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

    w ϑΝΠϧɾσΟϨΫτϦ໊͸CMPC USFFࣗ਎Ͱ͸ͳ ͘਌ͷUSFF͕͍࣋ͬͯΔɻ
  15. 15.

    HJUSFGT w HJUSFGTIFBETNBTUFSͱ͔HJUSFGTUBHTWͱ͔ɻ w DPNNJUͷ4)"ϋογϡ͕ॻ͍ͯ͋Δ͚ͩɻ

  16. 16.

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

    IFMMPSC
  17. 17.

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

  18. 18.

    HJUHD

  19. 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. 20.

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

    τ͕ݟΕΔɻ
  21. 21.

    QMVNCJOHDPNNBOET w HJUDBUpMF w HJUMTUSFF HJUNLUSFF HJUDPNNJUUSFF w HJUSFBEJOEFY HJUXSJUFJOEFY

    HJUDPNNJUJOEFY
  22. 22.

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