nanafshiを使って簡単に作るFUSEの動的ファイル

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1. ాଜཾଠ࿠
   
   (.0
   1FQBCP
   *OD
   
   'VLVPLBHP
   
   
   0LBZBNBHP OBOBGTIJΛ࢖ͬͯ؆୯ʹ࡞Δ '64&ͷಈతϑΝΠϧ
2. ΤϯδχΞ ాଜཾଠ࿠
   
   !@UPLJCJ ϗεςΟϯάࣄۀ෦ϗεςΟϯάάϧʔϓϚωʔδυΫϥ΢υνʔϜ
3. .PUJWBUJPO
4. ಈతʹத਎͕มΘΔ
   ϑΝΠϧΛ࡞Γ͍ͨ
5. Πϝʔδ
6. ༻్ wϛυϧ΢ΣΞͷઃఆϑΝΠϧΛੜ੒
   wൿີ伴ͷΑ͏ͳϑΝΠϧͰ͋Δ͜ͱΛཁٻ͞ΕΔೝূ৘ใΛऔಘ
   wϩάσʔλΛσΟεΫͰ͸ͳ͘֎෦ͷετΞʹอଘ
7. ྫ
   CBTI@IJTUPSZ wCBTI@IJTUPSZΛ֎෦ͷετΞʹอଘ͢Δ
8. ίϚϯυ ৼΔ෣͍ Λ
   ϑΝΠϧʹٖଶͤ͞Δͱ৭ʑͰ͖ͦ͏
9. "QQSPBDI
10. '64&
    'JMFTZTUFN
    JO
    6TFSTQBDF wϢʔβ্ۭؒͰϑΝΠϧγεςϜ Λ࡞੒͢Δ࢓૊Έ
    wEFWGVTFΛհͯ͠Χʔωϧۭ ؒͱϢʔβۭؒͷؒͰϑΝΠϧ΁ ͷΞΫηεཁٻΛ΍ΓऔΓ͢Δ
    w'64&σʔϞϯ͸ड͚औͬͨϦΫ ΤετΛॲཧͯ͠Χʔωϧۭؒʹ ฦ͢ Ҿ༻ݩ
    IUUQTKBXJLJQFEJBPSHXJLJ'JMFTZTUFN@JO@6TFSTQBDF
11. ϥΠϒϥϦ΋͋Δ͠
    ؆୯ʹͰ͖ΔͷͰ͸
12. ࣮૷ wHJUIVCDPNIBOXFOHPGVTF
    Λ࢖༻
    wTBNQMF͕๛෋Ͱཧղ͠΍͍͢
    wJOPEFϕʔεͰॲཧΛఆٛ͢ΔOPEFGTͱɺϑΝΠϧύεϕʔεͰॲཧ Λఆٛ͢ΔQBUIGTͷछྨͷ࣮૷ํ๏͕͋Δ
    wࠓճ͸JOPEFΛ஍ಓʹ࡞੒͍ͯ͘͠OPEFGTΛબ୒
13. ࣮૷Πϝʔδ
14. ͑
15. શવ؆୯ ͡Όͳ͍
16. 1SPCMFN
17. ෳࡶ͞ͷݪҼ wσΟϨΫτϦ΍ϑΝΠϧ΁ͷΞΫηε࣌ʹԿͷγεςϜίʔϧ͕ൃߦ ͞ΕͯɺͲͷΑ͏ͳ৘ใΛඞཁͱ͢Δͷ͔೺Ѳ͍ͯ͠ͳ͍ͱ͍͚ͳ͍
    ϨΠϠ௿Ί
    wγεςϜίʔϧͷର৅͕JOPEFͳͷ͔ɺJOPEFΛPQFOͨ࣌͠ʹੜ੒ ͞ΕΔ'JMFߏ଄ମͳͷ͔ͰৼΔ෣͍Λม͑Δඞཁ͕͋Δ
    wEFOUSZ΍ϖʔδΩϟογϡͷڍಈΛ஌Βͳ͍ͱɺࢥͬͨΑ͏ʹಈ͔ ͳ͍͕࣌͋Δ ಈ͔ͳ͔ͬͨ
18. ΍Γ͍ͨ͜ͱ͸
19. ϑΝΠϧʹΞΫηεͨ͠Β
    ͍͍ײ͡ͰίϚϯυΛ࣮ߦͯ͠΄͍͠
20. 1SPQPTBM
21. HJUIVCDPNUPLJCJOBOBGTIJ
22. OBOBGTIJ w໨త
    w'64&͸৭ʑͰָ͖ͯͦ͠͏͚ͩͲ࣮૷͸େม
    w΋ͬͱΧδϡΞϧʹ'64&ͰಈతͳϑΝΠϧΛ࡞Γ͍ͨ
    wඞཁͱ͢Δલఏ஌ࣝ γεςϜίʔϧͳͲ ΛͰ͖Δ͚ͩগͳ͍ͨ͘͠
    w΍Γ͍ͨ͜ͱ͕มΘΔ౓ʹɺίʔυΛॻ͍ͯϏϧυͯ͠όΠφϦΛ ࠶഑෍͢ΔखؒΛແ͍ͨ͘͠
23. OBOBGTIJ wZBNMͰσΟϨΫτϦͷߏ଄ͱϑΝΠϧΞΫηε࣌ͷৼΔ෣͍Λఆٛ
    wࢦఆͨ͠γΣϧͰఆٛ͞ΕͨίϚϯυΛ࣮ߦ͢Δ
    wεΫϦϓτͰ΋όΠφϦͰ΋ԿͰ΋
    wϑΝΠϧΞΫηε࣌ʹϓϩηε͔Β౉͖ͬͯͨ৘ใΛίϚϯυ࣮ߦ࣌ ʹ؀ڥม਺ͱͯ͠ઃఆ͢Δ
24. ઃఆྫ shell: /bin/bash services: - name: dir files: - name: now read: command: date - name: writable write: async: true command: echo $FUSE_STDIN >> /tmp/file
25. ಈ࡞ྫ $ nanafshi -c config.yml /mnt/nanafshi $ tree /mnt/nanafshi /mnt/nanafshi └── dir ├── now └── writable $ cat /mnt/nanafshi/dir/now Tue Feb 12 14:53:56 JST 2019
26. Ґஔ෇͚
27. ࣮૷ྫ func (n CommandFile) Open(flags uint32, ctx *fuse.Context) (nodefs.File, fuse.Status) { if flags&fuse.O_ANYWRITE != 0 { return nodefs.NewDevNullFile(), fuse.OK } p, err := n.ReadFile(ctx) if err != nil { return nil, fuse.EIO } return &nodefs.WithFlags{ File: nodefs.NewDataFile(p), FuseFlags: fuse.FOPEN_DIRECT_IO, }, fuse.OK } wJOPEF΁ͷૢ࡞ΛJOUFSGBDFͱͯ͠ఆٛͯ͘͠ΕͯΔͷͰͦΕΛຬͨ͢
28. ࣮૷ྫ func (n CommandFile) ReadFile(ctx *fuse.Context) ([]byte, error) { cmd, err := n.ReadCommand.Command.Build(conf.Shell, n.makeEnv(ctx)) if err != nil { return nil, err } out, err := cmd.Output() if err != nil { return nil, err } return out, nil } w'JMFTZTUFNͷίΞ࣮૷
29. ۤ࿑ͨ͠ͱ͜Ζ wEFOUSZͱ͔ϖʔδΩϟογϡͷษڧ
    w7'4ʹର͢ΔΠϯλʔϑΣʔεͷ࣮૷ JOPEF
    PQFSBUJPOT ͱɺϑΝΠ ϧγεςϜͱͯ͠ԿΛ͍ͨ͠ͷ͔Λ࣮૷͢Δ෦෼Λ෼཭ͤ͞ͳ͍ͱɺ ࠞಱͱͯ͘͠Δ
    wࣗ෼͕JOPEFΛ࡞͍ͬͯΔͷ͔'JMFߏ଄ମΛ࡞͍ͬͯΔͷ͔Θ͔Βͳ ͘ͳͬͯ͘Δ
    
30. ࣮૷ͷϙΠϯτ
31. ·ͱΊ w'64&͸৭ʑͰ͖ͦ͏Ͱເ͕޿͕Δ
    w࣮૷͕େมͰ΍Δؾ͕Ͱͳ͔ͬͨํ͸OBOBGTIJͰ࣮ݧͯ͠ΈͯԼ͍͞
    wOBOBGTIJ͕ཪͰίϚϯυΛ࣮ߦ ผϓϩηε͕ىಈ ͢ΔͷͰएׯͷ Φʔόʔϔου͕͋Γ·͢
    w໘ന͍࢖͍ํ͕͋ͬͨΒڭ͑ͯԼ͍͞