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  1. Cloudron Forum
  2. App Packaging & Development
  3. Localstorage & /app/data

Localstorage & /app/data

Scheduled Pinned Locked Moved App Packaging & Development
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  • BrutalBirdieB Offline
    BrutalBirdieB Offline
    BrutalBirdie
    Partner
    wrote on last edited by BrutalBirdie
    #2

    /app/data is being created by the localstorage addon on runtime.

    That's why many times in the Dockerfile we move folders/files to file_default and in the Dockerfile create a symlink to /app/data and then in the start script we copy the default to /app/data

    Like my work? Consider donating a drink. Cheers!

    1 Reply Last reply
    2
    • timconsidineT timconsidine

      I’m struggling with packaging an app (Flame).
      It seems that what I prepare in the Dockerfile in /app/data gets wiped when the app starts.

      Is this because the local storage addon resets /app/data ? Or is there another reason ?

      Met this with content placed in /app/data and also seems to be preventing creation of symlinks.

      Any guidance ?

      girishG Offline
      girishG Offline
      girish
      Staff
      wrote on last edited by
      #3

      @timconsidine said in Localstorage & /app/data:

      It seems that what I prepare in the Dockerfile in /app/data gets wiped when the app starts.

      Right, as @BrutalBirdie said, you should not prepare /app/data in the Dockerfile. Instead, prepare it at runtime, in your start.sh. In the Dockerfile, copy the files you need into /app/code or /app/pkg or something. Then, in start.sh copy over files from /app/pkg into /app/data.

      1 Reply Last reply
      2
      • timconsidineT Offline
        timconsidineT Offline
        timconsidine
        App Dev
        wrote on last edited by
        #4

        Thank you @BrutalBirdie and @girish

        And symlinks ? Better to create in the Dockerfile ?

        girishG 1 Reply Last reply
        0
        • timconsidineT timconsidine

          Thank you @BrutalBirdie and @girish

          And symlinks ? Better to create in the Dockerfile ?

          girishG Offline
          girishG Offline
          girish
          Staff
          wrote on last edited by
          #5

          @timconsidine I assume you mean symlinks from code to some writable data path? If so, yes, Dockerfile is the correct place.

          timconsidineT 1 Reply Last reply
          0
          • girishG girish

            @timconsidine I assume you mean symlinks from code to some writable data path? If so, yes, Dockerfile is the correct place.

            timconsidineT Offline
            timconsidineT Offline
            timconsidine
            App Dev
            wrote on last edited by
            #6

            @girish Thank you.
            I seem to be stuck in a loop (although I am not 100% sure what's going on).
            I create a symlink in the Dockerfile from a code directory to a writable data location.
            In the start.sh I copy contents of code directory to the /app/data path.
            But I'm using localstorage addon and I think it destroys the symlink when it creates /app/data.
            But I can't create or recreate the symlink in start.sh (as /app/code is readonly).

            in dockerfile :

            RUN mv /app/code/data /app/code/datasrc \
                && mkdir -p /app/code/datasrc/uploads \
                && ln -s /app/data/data /app/code/data \
                && ln -s /app/data/public /app/code/public
            

            in start.sh :

            mkdir -p /app/data/public /app/data/data
            cp -r /app/code/client/* /app/data/public/
            cp -r /app/code/datasrc/* /app/data/data
            

            App fails to launch because it tries to read (or write) to :
            Error: EROFS: read-only file system, open '/app/code/public/flame.css'

            But flame.css should be symlinked to /app/data/public/flame.css.

            I'm too close to this to see the problem.
            Any thoughts ?

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            • robiR Offline
              robiR Offline
              robi
              wrote on last edited by
              #7

              As was mentioned, you cannot do any /app/data operations in the Dockerfile.

              Conscious tech

              timconsidineT 1 Reply Last reply
              0
              • robiR robi

                As was mentioned, you cannot do any /app/data operations in the Dockerfile.

                timconsidineT Offline
                timconsidineT Offline
                timconsidine
                App Dev
                wrote on last edited by
                #8

                @robi I don't think I am (now).

                robiR 1 Reply Last reply
                0
                • timconsidineT Offline
                  timconsidineT Offline
                  timconsidine
                  App Dev
                  wrote on last edited by
                  #9

                  is /tmp writeable ?
                  e.g. can I prepare the app for runtime in /tmp, copy contents in start.sh and empty /tmp (for tidiness) ?

                  1 Reply Last reply
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                  • nebulonN Offline
                    nebulonN Offline
                    nebulon
                    Staff
                    wrote on last edited by
                    #10

                    /tmp is writeable and also created in runtime, however as the name suggests, the app should not rely on content to persist there. Traditionally it may be used as temporary storage for file uploads, of other caching files.

                    1 Reply Last reply
                    1
                    • timconsidineT timconsidine

                      @robi I don't think I am (now).

                      robiR Offline
                      robiR Offline
                      robi
                      wrote on last edited by robi
                      #11

                      @timconsidine said in Localstorage & /app/data:

                      @robi I don't think I am (now).

                      so what is this in Dockerfile?

                      && ln -s /app/data/data /app/code/data \

                      && ln -s /app/data/public /app/code/public

                      Conscious tech

                      timconsidineT 1 Reply Last reply
                      0
                      • robiR robi

                        @timconsidine said in Localstorage & /app/data:

                        @robi I don't think I am (now).

                        so what is this in Dockerfile?

                        && ln -s /app/data/data /app/code/data \

                        && ln -s /app/data/public /app/code/public

                        timconsidineT Offline
                        timconsidineT Offline
                        timconsidine
                        App Dev
                        wrote on last edited by
                        #12

                        @robi that's from the start.sh file which runs after Dockerfile has been built to an image.

                        robiR 1 Reply Last reply
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                        • timconsidineT timconsidine

                          @robi that's from the start.sh file which runs after Dockerfile has been built to an image.

                          robiR Offline
                          robiR Offline
                          robi
                          wrote on last edited by
                          #13

                          @timconsidine I updated my post, since it's about the ln commands not the cp commands

                          Conscious tech

                          1 Reply Last reply
                          0
                          • girishG Offline
                            girishG Offline
                            girish
                            Staff
                            wrote on last edited by
                            #14

                            I would double check if the app was built and updated properly to use your latest Dockerfile. You can do cloudron debug and then you can cloudron exec to inspect if all the symlinks are proper. You can then launch your start.sh manually in that shell also.

                            1 Reply Last reply
                            1
                            • timconsidineT Offline
                              timconsidineT Offline
                              timconsidine
                              App Dev
                              wrote on last edited by
                              #15

                              Thank you
                              So app builds and launches, symlinks created in Dockerfile work
                              But there is weirdness in running start.sh
                              Some commands executed, some not.
                              Eg the first mkdir works but not #2 or #3
                              The first cp from tmp works but not #2 or #3
                              The chown doesn't work but the script is running to the end and working because the app launches.
                              Any ideas ?
                              Here's the start.sh :

                              #!/bin/bash
                              # set -eu
                              mkdir -p /app/data/config || true
                              mkdir -p /app/data/public || true
                              mkdir -p /app/data/images || true
                              cp -r /tmp/skeleton/* /app/data/config
                              cp -r /tmp/public/* /app/data/public 
                              cp -r /tmp/images/* /app/data/images 
                              chown -R cloudron:cloudron /app/data
                              export npm_config_cache=/app/data/.npm-cache
                              exec /usr/local/bin/gosu cloudron:cloudron npm start
                              

                              Cloudronmanifest.json has localstorage addon and proxyAuth addon.

                              nebulonN 1 Reply Last reply
                              0
                              • timconsidineT timconsidine

                                Thank you
                                So app builds and launches, symlinks created in Dockerfile work
                                But there is weirdness in running start.sh
                                Some commands executed, some not.
                                Eg the first mkdir works but not #2 or #3
                                The first cp from tmp works but not #2 or #3
                                The chown doesn't work but the script is running to the end and working because the app launches.
                                Any ideas ?
                                Here's the start.sh :

                                #!/bin/bash
                                # set -eu
                                mkdir -p /app/data/config || true
                                mkdir -p /app/data/public || true
                                mkdir -p /app/data/images || true
                                cp -r /tmp/skeleton/* /app/data/config
                                cp -r /tmp/public/* /app/data/public 
                                cp -r /tmp/images/* /app/data/images 
                                chown -R cloudron:cloudron /app/data
                                export npm_config_cache=/app/data/.npm-cache
                                exec /usr/local/bin/gosu cloudron:cloudron npm start
                                

                                Cloudronmanifest.json has localstorage addon and proxyAuth addon.

                                nebulonN Offline
                                nebulonN Offline
                                nebulon
                                Staff
                                wrote on last edited by
                                #16

                                @timconsidine not sure if this the main problem, but mkdir -p ... does "no error if existing, make parent directories as needed" so should run it without the || true also if essential commands don't work in start.sh the app should not just continue anways in some unknown state.

                                timconsidineT 1 Reply Last reply
                                0
                                • nebulonN nebulon

                                  @timconsidine not sure if this the main problem, but mkdir -p ... does "no error if existing, make parent directories as needed" so should run it without the || true also if essential commands don't work in start.sh the app should not just continue anways in some unknown state.

                                  timconsidineT Offline
                                  timconsidineT Offline
                                  timconsidine
                                  App Dev
                                  wrote on last edited by
                                  #17

                                  @nebulon thank you
                                  I stuck in the || true because chatGPT told me to do so when I asked it why the script wasn't working ! šŸ˜„

                                  Yep, it's weird behaviour, some lines working but some not.
                                  I can execute the failed lines manually in Terminal, but not the right way to do it !

                                  BrutalBirdieB 1 Reply Last reply
                                  0
                                  • timconsidineT timconsidine

                                    @nebulon thank you
                                    I stuck in the || true because chatGPT told me to do so when I asked it why the script wasn't working ! šŸ˜„

                                    Yep, it's weird behaviour, some lines working but some not.
                                    I can execute the failed lines manually in Terminal, but not the right way to do it !

                                    BrutalBirdieB Offline
                                    BrutalBirdieB Offline
                                    BrutalBirdie
                                    Partner
                                    wrote on last edited by
                                    #18

                                    @timconsidine said in Localstorage & /app/data:

                                    I stuck in the || true because chatGPT told me to do so when I asked it why the script wasn't working ! šŸ˜„

                                    lol - That will just always make an exec return true / successful even when it fails.

                                    AI will replace developers šŸ˜ right.

                                    Like my work? Consider donating a drink. Cheers!

                                    timconsidineT 1 Reply Last reply
                                    0
                                    • BrutalBirdieB BrutalBirdie

                                      @timconsidine said in Localstorage & /app/data:

                                      I stuck in the || true because chatGPT told me to do so when I asked it why the script wasn't working ! šŸ˜„

                                      lol - That will just always make an exec return true / successful even when it fails.

                                      AI will replace developers šŸ˜ right.

                                      timconsidineT Offline
                                      timconsidineT Offline
                                      timconsidine
                                      App Dev
                                      wrote on last edited by timconsidine
                                      #19

                                      @BrutalBirdie said in Localstorage & /app/data:

                                      AI will replace developers right.

                                      Absolutely ... not !
                                      I have seen some absolute shockers (hallucinations, wrong responses) but nevertheless I do find it useful.
                                      Comes back to that old age truth : you can have the best sword/drill/hammer in the world, but it's only useful if you know how to use it.
                                      AI is helpful ... except when it's not and you recognise it is not !

                                      1 Reply Last reply
                                      0
                                      • robiR Offline
                                        robiR Offline
                                        robi
                                        wrote on last edited by
                                        #20

                                        If you stop calling it AI, it will begin to make sense as a tool.

                                        Conscious tech

                                        1 Reply Last reply
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