nanafshiを使って簡単に作るFUSEの動的ファイル

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ాଜཾଠ࿠(.01FQBCP *OD 'VLVPLBHP0LBZBNBHP OBOBGTIJΛ࢖ͬͯ؆୯ʹ࡞Δ '64&ͷಈతϑΝΠϧ

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ΤϯδχΞ ాଜཾଠ࿠!@UPLJCJ ϗεςΟϯάࣄۀ෦ϗεςΟϯάάϧʔϓϚωʔδυΫϥ΢υνʔϜ

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.PUJWBUJPO

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ಈతʹத਎͕มΘΔ ϑΝΠϧΛ࡞Γ͍ͨ

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Πϝʔδ

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༻్ wϛυϧ΢ΣΞͷઃఆϑΝΠϧΛੜ੒ wൿີ伴ͷΑ͏ͳϑΝΠϧͰ͋Δ͜ͱΛཁٻ͞ΕΔೝূ৘ใΛऔಘ wϩάσʔλΛσΟεΫͰ͸ͳ͘֎෦ͷετΞʹอଘ

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ྫCBTI@IJTUPSZ wCBTI@IJTUPSZΛ֎෦ͷετΞʹอଘ͢Δ

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ίϚϯυ ৼΔ෣͍ Λ ϑΝΠϧʹٖଶͤ͞Δͱ৭ʑͰ͖ͦ͏

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"QQSPBDI

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'64& 'JMFTZTUFNJO6TFSTQBDF wϢʔβ্ۭؒͰϑΝΠϧγεςϜ Λ࡞੒͢Δ࢓૊Έ wEFWGVTFΛհͯ͠Χʔωϧۭ ؒͱϢʔβۭؒͷؒͰϑΝΠϧ΁ ͷΞΫηεཁٻΛ΍ΓऔΓ͢Δ w'64&σʔϞϯ͸ड͚औͬͨϦΫ ΤετΛॲཧͯ͠Χʔωϧۭؒʹ ฦ͢ Ҿ༻ݩIUUQTKBXJLJQFEJBPSHXJLJ'JMFTZTUFN@JO@6TFSTQBDF

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ϥΠϒϥϦ΋͋Δ͠ ؆୯ʹͰ͖ΔͷͰ͸

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࣮૷ wHJUIVCDPNIBOXFOHPGVTFΛ࢖༻ wTBNQMF͕๛෋Ͱཧղ͠΍͍͢ wJOPEFϕʔεͰॲཧΛఆٛ͢ΔOPEFGTͱɺϑΝΠϧύεϕʔεͰॲཧ Λఆٛ͢ΔQBUIGTͷछྨͷ࣮૷ํ๏͕͋Δ wࠓճ͸JOPEFΛ஍ಓʹ࡞੒͍ͯ͘͠OPEFGTΛબ୒

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࣮૷Πϝʔδ

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શવ؆୯ ͡Όͳ͍

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1SPCMFN

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ෳࡶ͞ͷݪҼ wσΟϨΫτϦ΍ϑΝΠϧ΁ͷΞΫηε࣌ʹԿͷγεςϜίʔϧ͕ൃߦ ͞ΕͯɺͲͷΑ͏ͳ৘ใΛඞཁͱ͢Δͷ͔೺Ѳ͍ͯ͠ͳ͍ͱ͍͚ͳ͍ ϨΠϠ௿Ί wγεςϜίʔϧͷର৅͕JOPEFͳͷ͔ɺJOPEFΛPQFOͨ࣌͠ʹੜ੒ ͞ΕΔ'JMFߏ଄ମͳͷ͔ͰৼΔ෣͍Λม͑Δඞཁ͕͋Δ wEFOUSZ΍ϖʔδΩϟογϡͷڍಈΛ஌Βͳ͍ͱɺࢥͬͨΑ͏ʹಈ͔ ͳ͍͕࣌͋Δ ಈ͔ͳ͔ͬͨ

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΍Γ͍ͨ͜ͱ͸

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ϑΝΠϧʹΞΫηεͨ͠Β ͍͍ײ͡ͰίϚϯυΛ࣮ߦͯ͠΄͍͠

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1SPQPTBM

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HJUIVCDPNUPLJCJOBOBGTIJ

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OBOBGTIJ w໨త w'64&͸৭ʑͰָ͖ͯͦ͠͏͚ͩͲ࣮૷͸େม w΋ͬͱΧδϡΞϧʹ'64&ͰಈతͳϑΝΠϧΛ࡞Γ͍ͨ wඞཁͱ͢Δલఏ஌ࣝ γεςϜίʔϧͳͲ ΛͰ͖Δ͚ͩগͳ͍ͨ͘͠ w΍Γ͍ͨ͜ͱ͕มΘΔ౓ʹɺίʔυΛॻ͍ͯϏϧυͯ͠όΠφϦΛ ࠶഑෍͢ΔखؒΛແ͍ͨ͘͠

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OBOBGTIJ wZBNMͰσΟϨΫτϦͷߏ଄ͱϑΝΠϧΞΫηε࣌ͷৼΔ෣͍Λఆٛ wࢦఆͨ͠γΣϧͰఆٛ͞ΕͨίϚϯυΛ࣮ߦ͢Δ wεΫϦϓτͰ΋όΠφϦͰ΋ԿͰ΋ wϑΝΠϧΞΫηε࣌ʹϓϩηε͔Β౉͖ͬͯͨ৘ใΛίϚϯυ࣮ߦ࣌ ʹ؀ڥม਺ͱͯ͠ઃఆ͢Δ

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ઃఆྫ shell: /bin/bash services: - name: dir files: - name: now read: command: date - name: writable write: async: true command: echo $FUSE_STDIN >> /tmp/file

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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

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Ґஔ෇͚

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࣮૷ྫ 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

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࣮૷ྫ 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૷

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ۤ࿑ͨ͠ͱ͜Ζ wEFOUSZͱ͔ϖʔδΩϟογϡͷษڧ w7'4ʹର͢ΔΠϯλʔϑΣʔεͷ࣮૷ JOPEFPQFSBUJPOT ͱɺϑΝΠ ϧγεςϜͱͯ͠ԿΛ͍ͨ͠ͷ͔Λ࣮૷͢Δ෦෼Λ෼཭ͤ͞ͳ͍ͱɺ ࠞಱͱͯ͘͠Δ wࣗ෼͕JOPEFΛ࡞͍ͬͯΔͷ͔'JMFߏ଄ମΛ࡞͍ͬͯΔͷ͔Θ͔Βͳ ͘ͳͬͯ͘Δ

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࣮૷ͷϙΠϯτ

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·ͱΊ w'64&͸৭ʑͰ͖ͦ͏Ͱເ͕޿͕Δ w࣮૷͕େมͰ΍Δؾ͕Ͱͳ͔ͬͨํ͸OBOBGTIJͰ࣮ݧͯ͠ΈͯԼ͍͞ wOBOBGTIJ͕ཪͰίϚϯυΛ࣮ߦ ผϓϩηε͕ىಈ ͢ΔͷͰएׯͷ Φʔόʔϔου͕͋Γ·͢ w໘ന͍࢖͍ํ͕͋ͬͨΒڭ͑ͯԼ͍͞