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。

Transcript

1. 
   (JU
   ͷ಺෦σʔλߏ଄ 4IVIFJ
   
   ,BHBXB
   .
   5FDI
   5BML
   
2. MT
   HJU '&5$)@)&"%
   )&"%
   DPOpH
   EFTDSJQUJPO
   IPPLT
   JOEFY
   JOGP
   MPHT
   PCKFDUT
   QBDLFESFGT
   SFGT
3. USFF
   HJUPCKFDUT HJUPCKFDUT
   ᵓᴷᴷ
   
   ᴹ
   
   
   ᵋᴷᴷ
   DGBFCCFG⒎DGFCGC
   ᵓᴷᴷ
   
   ᴹ
   
   
   ᵋᴷᴷ
   CECBFDBFFFD⒎FG
   ᴹ
   
   
   ᵋᴷᴷ
   EECCFBFECFDEB
   ᵓᴷᴷ
   F
   ᴹ
   
   
   ᵋᴷᴷ
   FFBFBEGGFCDFGD
   ᵓᴷᴷ
   FC
   ᴹ
   
   
   ᵋᴷᴷ
   GGGFGEGECBBCBBGCFBCF
   ᵓᴷᴷ
   JOGP
   ᵋᴷᴷ
   QBDL
   
4. HJUPCKFDUT w ϑΝΠϧγεςϜΛར༻ͨ͠
   ,FZ
   7BMVF
   4UPSFɻ
   w Ωʔ͸஋ͷ
   4)"
   ϋογϡɻ্
   
   ܻʢ
   CZUFʣ͕ σΟϨΫτϦ໊ɺ࢒Γ͕ϑΝΠϧ໊ɻ  DGBFCCFG⒎DGFCGC σΟϨΫτϦ໊
   
   CZUF ϑΝΠϧ໊
   
   CZUF
5. PCKFDU
   ͷछྨ CMPC USFF DPNNJU ϑΝΠϧͷத਎ σΟϨΫτϦ
   ͷΑ͏ͳ΋ͷ ͍ΘΏΔίϛοτ
6. PCKFDU
   ͷߏ଄ CMPC  a QVUT
   )FMMP
   8PSMEaO PCKFDU
   ͷ
   छྨ ۭന αΠζ ψϧ
   จࣈ σʔλ 4)"
   ϋογϡ ϑΝΠϧ໊ ϑΝΠϧͷத਎ [MJC
   ѹॖ
   ϔομ
7. HJU
   DBUpMF
   Q
   TIB
   IBTI
8. CMPC QVUT
   )FMMP
   8PSMEaO w ϑΝΠϧͷத਎ʮ͚ͩʯ͍࣋ͬͯΔɻ
   w ϑΝΠϧͷ໊લ͸͍࣋ͬͯͳ͍ɻ
9. USFF 
   IFMMPKTa4)"
   ϋογϡʢόΠφϦʣ
   
   IFMMPSCa4)"
   ϋογϡʢόΠφϦʣ w USFF
   ͱ
   CMPC
   ͷҰཡɻ
   w ֤ߦ͸໊લ΍ϞʔυʢύʔϛογϣϯʣΛ͍࣋ͬͯΔɻ
   w ຊ౰͸վߦͳ͠ɻ
10. DPNNJU USFF
    FBGD⒎FBBDFDDGEF
    BVUIPS
    4IVIFJ
    ,BHBXB
    TIVIFJLBHBXB!HNBJMDPN
    
    
    DPNNJUUFS
    4IVIFJ
    ,BHBXB
    TIVIFJLBHBXB!HNBJMDPN
    
    
    )FMMP
    8PSME w USFF
    ΁ͷࢀরΛҰ͍ͭ࣋ͬͯΔɻ
    w ͋ͱ͸ॻ͍ͨਓͱίϛοτͨ͠ਓɺίϛοτϝοηʔδɻ
11. ֤
    PCKFDU
    ͷؔ܎ CMPC USFF DPNNJU
     CMPC IFMMPSC (FNpMF *OJUJBM
    DPNNJU
12. ֤
    PCKFDU
    ͷؔ܎ CMPC USFF DPNNJU
     DPNNJU
     USFF CMPC IFMMPSC (FNpMF USFF MJC IFMMPSC (FNpMF *OJUJBM
    DPNNJU IFMMPSC
    Λ
    MJC
    ʹೖΕͨ
13. ֤
    PCKFDU
    ͷؔ܎ CMPC USFF DPNNJU
     DPNNJU
     DPNNJU
     USFF USFF CMPC IFMMPSC (FNpMF USFF CMPC MJC MJC IFMMPSC (FNpMF (FNpMF *OJUJBM
    DPNNJU IFMMPSC
    Λ
    MJC
    ʹೖΕͨ ར༻ϥΠϒϥϦ Λߋ৽
14. Θ͔Δ͜ͱ w DPNNJU
    ͚ͩͰ͸ͳ͘
    CMPC
    USFF
    ΋
    4)"
    ϋογϡ Λ͍࣋ͬͯΔɻ
    w มΘΒͳ͍
    CMPC
    USFF
    ͸
    USFF
    DPNNJU
    ؒͰڞ༗͞Ε Δɻ
    w ϑΝΠϧɾσΟϨΫτϦ໊͸
    CMPC
    USFF
    ࣗ਎Ͱ͸ͳ ͘਌ͷ
    USFF
    ͕͍࣋ͬͯΔɻ
15. HJUSFGT w HJUSFGTIFBETNBTUFS
    ͱ͔
    HJUSFGTUBHTW
    ͱ͔ɻ
    w DPNNJU
    ͷ
    4)"
    ϋογϡ͕ॻ͍ͯ͋Δ͚ͩɻ
16. HJUJOEFY w ࣍ͷ
    DPNNJUʢͷ
    USFFʣΛ࡞ΔͨΊͷ৘ใ͕Ωϟογϡ͞Ε͍ͯΔɻ
    w มߋ͞ΕͨϑΝΠϧ͚ͩͰ͸ͳ͘શϑΝΠϧ͕ೖ͍ͬͯΔɻ
    w HJUMTpMFT
    Ͱ͸ݟ͑ͳ͍͕ɺ࠷ऴߋ৽೔࣌ͳͲ΋ೖ͍ͬͯΔɻ
    
    HJU
    MTpMFT
    TUBHF
    
    DDGEFECGCDBFDBECDC
    
    IFMMPKT
    
    D⒎BBFGDEEBGCE
    
    IFMMPSC
17. ͦ͏͍͑͹ɾɾɾ w େ͖ͳϑΝΠϧʹҰߦ଍ͨ͠Βɺผͷ
    CMPC
    ͕Ͱ͖ Δɻ
    w ͋Εɺ(JU
    ͬͯϑΝΠϧΛࠩ෼Ͱ࣋ͬͯͳ͍ͷʁ
18. HJU
    HD
19. CFGPSF HJUPCKFDUT
    ᵓᴷᴷ
    
    ᴹ
    
    
    ᵋᴷᴷ
    DGBFCCFG⒎DGFCGC
    ᵓᴷᴷ
    
    ᴹ
    
    
    ᵋᴷᴷ
    DEBGEBFGDE
    ᵓᴷᴷ
    
    ᴹ
    
    
    ᵋᴷᴷ
    CECBFDBFFFD⒎FG
    ᵓᴷᴷ
    C
    ᴹ
    
    
    ᵋᴷᴷ
    GFGFCECBFFGBFC
    ᵓᴷᴷ
    DD
    ᴹ
    
    
    ᵋᴷᴷ
    GEFECGCDBFDBECDC
    ᵓᴷᴷ
    E
    ᴹ
    
    
    ᵋᴷᴷ
    GCDDEDEGDGFG
    ᵓᴷᴷ
    EC
    ᴹ
    
    
    ᵋᴷᴷ
    EECCFBFECFDEB
    ᵓᴷᴷ
    F
    ᴹ
    
    
    ᵋᴷᴷ
    FFBFBEGGFCDFGD
    ᵓᴷᴷ
    FB
    ᴹ
    
    
    ᵋᴷᴷ
    GD⒎FBBDFDDGEF
    ᵓᴷᴷ
    FC
    ᴹ
    
    
    ᵋᴷᴷ
    GGGFGEGECBBCBBGCFBCF
    ᵓᴷᴷ
    JOGP
    ᵋᴷᴷ
    QBDL
    HJUPCKFDUT
    ᵓᴷᴷ
    JOGP
    ᴹ
    
    
    ᵋᴷᴷ
    QBDLT
    ᵋᴷᴷ
    QBDL
    
    
    
    
    ᵓᴷᴷ
    QBDLFDGDGBFBBGBCFECFGGJEY
    
    
    
    
    ᵋᴷᴷ
    QBDLFDGDGBFBBGBCFECFGGQBDL
    BGUFS
20. 1BDLpMF w JEY
    ͱQBDL
    ͷϖΞɻQBDL
    ͕ຊମͰ
    JEY
    ͕ΠϯσοΫ εɻ
    w ෳ਺ͷ
    PCKFDU
    ͕٧Ίࠐ·Ε͍ͯΔɻ
    w ඞཁʹԠͯ͡
    CMPC
    Λࠩ෼Ͱอ࣋ɻ
    w HJU
    WFSJGZQBDL
    W
    HJUPCKFDUTQBDLQBDLYYYJEY
    ͰϦε τ͕ݟΕΔɻ
21. QMVNCJOH
    DPNNBOET w HJU
    DBUpMF
    w HJU
    MTUSFF
    HJU
    NLUSFF
    HJU
    DPNNJUUSFF
    w HJU
    SFBEJOEFY
    HJU
    XSJUFJOEFY
    HJU
    DPNNJUJOEFY
22. ࢀߟ w 1SP
    (JU
    
    
    (JU
    *OUFSOBMT
 IUUQTHJUTDNDPNCPPLFOW
    w (JU
    $PNNVOJUZ
    #PPL
    
    
    *OUFSOBMT
    BOE
    1MVNCJOH
 IUUQTTDIBDPOHJUIVCJPHJUCPPLJOEFYIUNM
    w HJU%PDVNFOUBUJPOUFDIOJDBM
 IUUQTHJUIVCDPNHJUHJUUSFFNBTUFS%PDVNFOUBUJPOUFDIOJDBM