cobra は便利になっている

2022年3-shake SRE Tech Talk #4
https://3-shake.connpass.com/event/253028/

Transcript

1. TIBLF43&5FDI5BML!OXJJ[P
   DPCSB͸ศརʹͳ͍ͬͯΔ
   TQGDPCSB࠷৽ػೳٴͼӡ༻࣌ʹޮ͘ػೳ
   

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2. ૣ଎Ͱ͕͢
   օ͞ΜɺࣗಈԽ
   

   ͯ͠·͔͢ʁ
   ୀ۶ͳ͜ͱ͸1ZUIPOʹ΍ΒͤΑ͏ୈ൛ʕϊϯϓϩάϥϚʔʹ΋Ͱ͖ΔࣗಈԽॲཧϓϩάϥϛϯά
   

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3. ๻΋ࣗಈԽ͕޷͖Ͱ͢
   

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4. ͔͠͠ɺෳࡶʹൃୡͨ͠
   

   ࣗಈԽ͸ࣗવͷౖΓͱ
   

   ۠ผ͕͔ͭͳ͍
   

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5. ࣗಈԽʹඞཁͳͷ͸டং
   

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6. ίϚϯυϥΠϯπʔϧʹ͍ͭͯޠΔͱ͖ʹ๻ͷޠΔ͜ͱ #yapcasia

   https://speakerdeck.com/tcnksm/komandorainturunituiteyu-rutokinipu-falseyu-rukoto-number-yapcasia
   $-*5PPMΛॻ͘ͱ͖ϨϏϡʔͰ໎ͬͨ࣌ʹ͸
   

   ΄΅ɺඞͣͪ͜ΒͷυΩϡϝϯτΛݟ͍ͯ·͢ɻ
   

   πʔϧͷػೳΑΓͪ͜ΒʹཔΕʂʂʂ
   

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7. ίϚϯυϥΠϯπʔϧʹ͍ͭͯޠΔͱ͖ʹ๻ͷޠΔ͜ͱΑΓҾ༻
   w ίϚϯυϥΠϯπʔϧʹ͓͍ͯॏཁͳϙΠϯτ
   

   ͭͷ͜ͱʹूத͍ͯ͠
   

   ௚ײతʹ࢖͑Δ
   

   ଞͷπʔϧͱ࿈ܞͰ͖Δ
   

   ར༻Λॿ͚ͯ͘ΕΔ
   

   ద੾ͳσϑΥϧτ஋Λ࣋ͪઃఆ΋Ͱ͖Δ
   

   ۤ௧ͳ͘ΠϯετʔϧͰ͖Δ
   

   ͙͢ʹվमͰ͖Δ
   
   ίϚϯυϥΠϯπʔϧʹ͍ͭͯޠΔͱ͖ʹ๻ͷޠΔ͜ͱ #yapcasia

   https://speakerdeck.com/tcnksm/komandorainturunituiteyu-rutokinipu-falseyu-rukoto-number-yapcasia
   w ͍͔ʹzྑ͍z$-*πʔϧΛ࡞Γ࢝ΊΔ͔ʁʹ͍ͭͯͷͭͷखॱ
   

   ͲΜͳπʔϧΛ࡞Δ͔ߟ͑Δ
   

   ݴޠΛબͿ
   

   3&"%/&NEΛॻ͘
   

   ߴ଎ʹϓϩτλΠϓΛ࡞Δ
   

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8. ࢲͷࠢͷ੤໿📄
   w 4IFMM4DSJQU͸ߦ͙Β͍·Ͱ
   w ͦΕҎ֎͸(PMBOHͰ։ൃ
   

   🔔ϥΠϒϥϦ΍πʔϧ͕ͳ͍ͳͲͰͦͷબ୒ࢶҎ֎ͩͱ
   

   ɹࣗಈԽʹͱͯ΋޻਺͕͔͔Δ৔߹ʹ͸ଞͷݴޠΛ࢖͏
   

   🔔(PݴޠͰͷϝϦοτ͸͍͔ͭ͋͘Γ·͕͢zۤ௧ͳ͘ΠϯετʔϧͰ͖ͯར༻͠ଓ͚қ͍z
   

   ɹίϚϯυϥΠϯπʔϧΛॻ͘͜ͱʹ޲͍͍ͯΔͱࢥ͍·͕͢ຊൃදͰ͸औΓѻΘͳ͍
   

   🔔Α͍(PͷίʔυΛॻ͘ʹ͸ʮ(Pʹೖͬͯ͸(Pʹै͑ʯͳͲͷΑ͍ࢿྉ͕͋ΔͷͰ
   

   ɹຊൃදͰ͸औΓѻΘͳ͍ͷͰͥͻɺಡΜͰΈͯ΄͍͠Ͱ͢ɻ
   

   ɹ
   

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9. ͷ
   ࿩ʹ΍ͬͱಥೖ͢Δ
   -5ͳͷʹ
   લஔ͖Ͱ͋Δ
   

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10. TQGDPCSBͱ͸ʁ
    w (PʹΑΔ੩తαΠτδΣωϨʔλʔͰ͋ΔIVHPͷ
    ։ൃऀͱͯ͠஌ΒΕΔɻTQGࢯʹΑΔ$-*Λ࡞੒
    ͢ΔҝͷπʔϧͰ͢ɻ
    
    IUUQTHJUIVCDPNTQGDPCSB
    $ go mod init SRETT04
    $ cobra-cli init
    ਽ܗͷ࡞੒
    .
    ᵓ── LICENSE
    ᵓ── README.md
    ᵓ── cmd
    │ └── root.go
    ᵓ── go.mod
    ᵓ── go.sum
    └── main.go
    1 directory, 6
    fi
    les
    IUUQTTZVNIBUFOBCMPHDPNFOUSZ
    (PMBOHͰ$-*5PPMΛ࡞Δ࣌ʹ͸$PCSBΛ࢖͍͕ͪ
    DPCSB͔ΒDPCSBDMJʹมߋ͠·ͨ͠
    IUUQTHJUIVCDPNTQGDPCSBSFMFBTFTUBHW
    

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11. TQGDPCSBͱ͸ʁ
    w ༷ʑͳػೳ͕͋Γ$PCSBΛར༻͢Δͱ
    

    αϒίϚϯυͷݟ௨͠ͳͲ΋ྑ͘ͳΓ
    

    ·ͨɺIFMQ΁ͷ௥Ճ΋ࣗಈͰߦͬͯ͘ΕΔ
    
    IUUQTHJUIVCDPNTQGDPCSB
    $ cobra-cli add get
    $ cobra-cli add create
    αϒίϚϯυͷ௥Ճ
    .
    ᵓ── LICENSE
    ᵓ── README.md
    ᵓ── cmd
    │ ᵓ── create.go
    │ ᵓ── get.go
    │ └── root.go
    ᵓ── go.mod
    ᵓ── go.sum
    └── main.go
    ϑϥάͷ௥ՃͳͲ͸ࣗલͰ࣮૷͕ඞཁ
    

    JOJU
    ಺ͰϑϥάΛఆٛ
    ࣮ࡍͷॲཧͰϑϥάΛࢀর
    HFUHP΍DSFBUFHPʹ
    

    ֤ػೳΛ࣮૷Λ͢Ε͹ྑ͍
    🔔-POH)FMQʹ
    

    ɹ(JUIVC3FQPTJUPSZ͸
    

    ɹॻ͍͓͍ͯͯ΄͍͠
    

    ɹະདྷͷӡ༻Λ͢Δ୭͔ͷͨΊʹ
    IUUQTHJUIVCDPNTQGDPCSBCMPCNBJOVTFS@HVJEFNE
    

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12. ͷศརػೳͷ
    ࿩ʹ΍ͬͱಥೖ͢Δ
    -5ͳͷʹ
    ຊ୊Ͱ͋Δ
    

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13. ᶃࣗಈิ׬
    
    IUUQTTZVNIBUFOBCMPHDPNFOUSZ
    (Pݴޠͷ$-*࡞੒πʔϧͰ͋ΔDPCSBͷγΣϧิ׬ͷੜ੒͕͋·Γʹ΋؆୯
    $ [command] completion
    fi
    sh
    fi
    TIิ׬ϑΝΠϧ
    $ [command] completion [bash|zsh|
    fi
    sh|powershell]
    CBTIc[TIc
    fi
    TIc
    QPXFSTIFMM
    

    ิ׬ϑΝΠϧ
    ࣗಈิ׬ϑΝΠϧ͕؆୯ʹੜ੒Ͱ͖ΔΑ͏ʹͳΓ·ͨ͠
    

    ରԠ͍ͯ͠Δͷ͸CBTIc[TIcGJTIcQPXFSTIFMMʹରԠ͍ͯ͠Δ
    

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14. ᶄ(SPVQGMBHTػೳʹ͍ͭͯ
    w 'MBHΛ૬ޓʹඞཁͳΦϓγϣϯΛද͢৔߹
    
    rootCmd.Flags().StringVarP(&u, "username", "u", "", "Username (required if password is set)")
    rootCmd.Flags().StringVarP(&pw, "password", "p", "", "Password (required if username is set)")
    rootCmd.MarkFlagsRequiredTogether("username", "password")
    IUUQTHJUIVCDPNTQGDPCSBCMPCNBJOVTFS@HVJEFNE
    fl
    BHHSPVQT
    Flag Groups
    rootCmd.Flags().BoolVar(&u, "json", false, "Output in JSON")
    rootCmd.Flags().BoolVar(&pw, "yaml", false, "Output in YAML")
    rootCmd.MarkFlagsMutuallyExclusive("json", "yaml")
    w 'MBHΛ૬ޓʹഉଞతͳΦϓγϣϯΛද͢৔߹
    'MBHʹάϧʔϓػೳ௥Ճ͢Δͷ΋؆୯ʹ࣮ݱͰ͖Δ
    ⭐ӡ༻࣌ʹґཔ͢Δ࣌ʹָ
    

    ɹԿ͕଍Γͳ͍͔ࣔ͢ͷେมʜ
    

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15. ᶅΞΫςΟϒϔϧϓ
    w #BTIͱ[TIͷΈʹରԠ͍ͯ͠ΔɻUBCΛԡ͍ͯ͠ΔλΠϛϯάͰ
    

    ର࿩తʹϔϧϓΛग़͢ػೳ
    
    IUUQTHJUIVCDPNTQGDPCSBCMPCNBJOBDUJWF@IFMQNE
    ValidArgsFunction: func(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {
    var comps []string
    if len(args) == 0 {
    comps = cobra.AppendActiveHelp(comps, "You must choose a name for the repo you are adding")
    } else if len(args) == 1 {
    comps = cobra.AppendActiveHelp(comps, "You must specify the URL for the repo you are adding")
    } else {
    comps = cobra.AppendActiveHelp(comps, "This command does not take any more arguments")
    }
    return comps, cobra.ShellCompDirectiveNoFileComp
    },
    bash-5.1$ helm repo add [tab]
    You must choose a name for the repo you are adding
    bash-5.1$ helm repo add grafana [tab]
    You must specify the URL for the repo you are adding
    bash-5.1$ helm repo add grafana https://grafana.github.io/helm-charts [tab]
    This command does not take any more arguments
    ⭐ର࿩࣌ʹָʹͳΔͷͰخ͍͠ɹ
    fi
    TIར༻ऀ͸Ըܙʹ༬͔Εࢮ
    

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16. ׬
    

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