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Deploying Application on Linux

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  • mrjjM Offline
    mrjjM Offline
    mrjj
    Lifetime Qt Champion
    wrote on last edited by
    #2

    Hi
    Seems you did well.
    Sounds correct.
    And yes. step 4 add your app folder to the paths where the OS will try load So files.

    did you try ldd on libQt5XcbQpa and see if it needs something also ?

    1 Reply Last reply
    1
    • U Offline
      U Offline
      unzu
      wrote on last edited by unzu
      #3

      @mrjj said in Deploying Application on Linux:

      And yes. step 4 add your app folder to the paths where the OS will try load So files.
      Could you explain that please? I thought I can put my application folder anywhere I want?

      I tried some things:

      • I am still on the computer where I build the app.
      • When I delete all library-files, the application works with the script.
      • I started adding 1 library after the other to my application folder and tried running the script. So far I added:
      1. libQt5Gui.so.5.15.2, libQt5Gui.so.5 (I added both, first is the library itself, second is the link to it.)
      2. libQt5Widgets.so.5.15.2, libQt5Widgets.so.5 (again library and link)

      Up to this point, the script still works. I think it takes the libraries that I've provided in my folder and gets the missing ones from the Qt-directory itself.

      1. libtQt5Bluetooth.so.5.15.2, libQt5Bluetooth.so.5 <- Here it starts to become strange. The script wont work anymore and I get the error-message:
      error while loading shared libraries: libQt5Concurrent.so.5: cannot open shared object file: No such file or directory
      

      What is happening here? If it was able to find all libraries before, including the QBluetooth and QConcurrent-libraries, how can it not find the QConcurrent-library anymore? I mean, its still in the Qt-directory..???

      1. Despite the strange behavior in step 3, I added libQt5Concurrent.so.5.15.2, libQt5Concurrent.so.5 and tried executing the script again. Error message:
      Cannot mix incompatible Qt library (5.12.8) with this library (5.15.2)
      

      I am really stuck and I don't know what else I could try, help is much appreciated.

      Unzu

      mrjjM 1 Reply Last reply
      0
      • U unzu

        @mrjj said in Deploying Application on Linux:

        And yes. step 4 add your app folder to the paths where the OS will try load So files.
        Could you explain that please? I thought I can put my application folder anywhere I want?

        I tried some things:

        • I am still on the computer where I build the app.
        • When I delete all library-files, the application works with the script.
        • I started adding 1 library after the other to my application folder and tried running the script. So far I added:
        1. libQt5Gui.so.5.15.2, libQt5Gui.so.5 (I added both, first is the library itself, second is the link to it.)
        2. libQt5Widgets.so.5.15.2, libQt5Widgets.so.5 (again library and link)

        Up to this point, the script still works. I think it takes the libraries that I've provided in my folder and gets the missing ones from the Qt-directory itself.

        1. libtQt5Bluetooth.so.5.15.2, libQt5Bluetooth.so.5 <- Here it starts to become strange. The script wont work anymore and I get the error-message:
        error while loading shared libraries: libQt5Concurrent.so.5: cannot open shared object file: No such file or directory
        

        What is happening here? If it was able to find all libraries before, including the QBluetooth and QConcurrent-libraries, how can it not find the QConcurrent-library anymore? I mean, its still in the Qt-directory..???

        1. Despite the strange behavior in step 3, I added libQt5Concurrent.so.5.15.2, libQt5Concurrent.so.5 and tried executing the script again. Error message:
        Cannot mix incompatible Qt library (5.12.8) with this library (5.15.2)
        

        I am really stuck and I don't know what else I could try, help is much appreciated.

        Unzu

        mrjjM Offline
        mrjjM Offline
        mrjj
        Lifetime Qt Champion
        wrote on last edited by
        #4

        @unzu
        But is the error correct ?
        Did you have 5.12.8 installed at some point?

        It seems to find another version ?

        Could it be that libQt5Concurrent.so.5 is a link to other version ?

        1 Reply Last reply
        0
        • U Offline
          U Offline
          unzu
          wrote on last edited by unzu
          #5

          @mrjj said in Deploying Application on Linux:

          Did you have 5.12.8 installed at some point?

          I dont think so.
          I've setup the system a few days ago and I dont think that I have installed multiple Qt Versions.
          However, I managed to 'fix' it, it is working now:

          I was that desparate, that I copied all the Qt libraries: ALL OF 'EM! and put them in my directory.
          And you know what? ...the script works!

          I don't know why and how, but I can take my folder, put it on a different computer that never saw Qt and can run my application.
          One thing that I noticed is, that there were some libraries both in the linux-/lib/-folder and in the Qt-folder.
          For example, I took libicuuc, libicuio and so on from the linux-lib-folder, because when i ran ldd on my application, it showed the libraries there. Maybe I was supposed to take those libraries from the Qt folder?

          Currently I am very happy that it's running after spending multiple days on that issue :)
          The application doesn't detect the libqmysql-plugin right now, not sure what the cause for that is, but I am positive that there is some way to get it to work.. :)

          Thanks so far for your time and help!
          Unzu

          mrjjM 1 Reply Last reply
          1
          • U unzu

            @mrjj said in Deploying Application on Linux:

            Did you have 5.12.8 installed at some point?

            I dont think so.
            I've setup the system a few days ago and I dont think that I have installed multiple Qt Versions.
            However, I managed to 'fix' it, it is working now:

            I was that desparate, that I copied all the Qt libraries: ALL OF 'EM! and put them in my directory.
            And you know what? ...the script works!

            I don't know why and how, but I can take my folder, put it on a different computer that never saw Qt and can run my application.
            One thing that I noticed is, that there were some libraries both in the linux-/lib/-folder and in the Qt-folder.
            For example, I took libicuuc, libicuio and so on from the linux-lib-folder, because when i ran ldd on my application, it showed the libraries there. Maybe I was supposed to take those libraries from the Qt folder?

            Currently I am very happy that it's running after spending multiple days on that issue :)
            The application doesn't detect the libqmysql-plugin right now, not sure what the cause for that is, but I am positive that there is some way to get it to work.. :)

            Thanks so far for your time and help!
            Unzu

            mrjjM Offline
            mrjjM Offline
            mrjj
            Lifetime Qt Champion
            wrote on last edited by
            #6

            @unzu
            Good work.
            Well normally one don't need to take system
            So files as they are already installed by the os.

            regarding libqmysql-plugin
            did you install the mysql client libs ? the plugin will try to load them.

            Nothing very bad about copying all of them.
            You could then on the clean linux, simply rename those you think you surely are not using
            and see if it still starts.

            Btw there is also
            https://github.com/probonopd/linuxdeployqt
            Only tested it a bit but not so much as when you first made a deplyment folder you can reuse it untill you switch Qt version.

            1 Reply Last reply
            0
            • M Offline
              M Offline
              mnesarco
              wrote on last edited by
              #7

              You can use linuxdeploy. It is easy peasy (note that linuxdeploy is not linuxdeployqt)

              https://github.com/linuxdeploy/linuxdeploy

              JonBJ 1 Reply Last reply
              0
              • M mnesarco

                You can use linuxdeploy. It is easy peasy (note that linuxdeploy is not linuxdeployqt)

                https://github.com/linuxdeploy/linuxdeploy

                JonBJ Offline
                JonBJ Offline
                JonB
                wrote on last edited by JonB
                #8

                @mnesarco
                Hi. I had heard about linuxdeployqt, but not linuxdeploy. You're not the author, are you? :) Would you care to summarize why linuxdeploy is better/preferred by you?

                1 Reply Last reply
                0
                • U Offline
                  U Offline
                  unzu
                  wrote on last edited by
                  #9

                  Thanks for all the responses.

                  I've already looked into linuxdeployqt, however it is mandatory to use the oldest LTS Ubuntu version, which was no option for me.
                  Following the deployment guide I manged to get the app to work.
                  I really like mrjj's idea to just copy the entire library-folder and to delete unneeded apps via testing on a clean linux system.

                  I also managed to get the mysql-plugin to work.
                  The error I made was to assume that I have to put the library into the plugins folder as mentioned in the Qt for Linux/X11 - Deployment Guide.
                  If I had read the guide more carefully, I would have seen that the plugins need to be put into specific folders, eg. sqldrivers for the mysql-plugin.

                  unzu

                  jsulmJ 1 Reply Last reply
                  0
                  • U unzu

                    Thanks for all the responses.

                    I've already looked into linuxdeployqt, however it is mandatory to use the oldest LTS Ubuntu version, which was no option for me.
                    Following the deployment guide I manged to get the app to work.
                    I really like mrjj's idea to just copy the entire library-folder and to delete unneeded apps via testing on a clean linux system.

                    I also managed to get the mysql-plugin to work.
                    The error I made was to assume that I have to put the library into the plugins folder as mentioned in the Qt for Linux/X11 - Deployment Guide.
                    If I had read the guide more carefully, I would have seen that the plugins need to be put into specific folders, eg. sqldrivers for the mysql-plugin.

                    unzu

                    jsulmJ Offline
                    jsulmJ Offline
                    jsulm
                    Lifetime Qt Champion
                    wrote on last edited by
                    #10

                    @unzu said in Deploying Application on Linux:

                    however it is mandatory to use the oldest LTS Ubuntu version

                    It's not.This is simply an advice to have a package which can be run on as many Linux distributions as possible. You do not have to follow this advice.

                    https://forum.qt.io/topic/113070/qt-code-of-conduct

                    mrjjM 1 Reply Last reply
                    0
                    • jsulmJ jsulm

                      @unzu said in Deploying Application on Linux:

                      however it is mandatory to use the oldest LTS Ubuntu version

                      It's not.This is simply an advice to have a package which can be run on as many Linux distributions as possible. You do not have to follow this advice.

                      mrjjM Offline
                      mrjjM Offline
                      mrjj
                      Lifetime Qt Champion
                      wrote on last edited by mrjj
                      #11

                      @jsulm
                      Hi
                      So linuxdeploy +Qt plugin allows to run on newer distros (to make the appDir) ? as when tried
                      linuxdeployqt it refused to do anything due to the distro being too new.

                      Also there was talk about -unsupported-allow-new-glibc options but it did not
                      know that option.

                      so linuxdeploy is more "relaxed" ?

                      That does indeed sound promising.

                      jsulmJ 1 Reply Last reply
                      0
                      • mrjjM mrjj

                        @jsulm
                        Hi
                        So linuxdeploy +Qt plugin allows to run on newer distros (to make the appDir) ? as when tried
                        linuxdeployqt it refused to do anything due to the distro being too new.

                        Also there was talk about -unsupported-allow-new-glibc options but it did not
                        know that option.

                        so linuxdeploy is more "relaxed" ?

                        That does indeed sound promising.

                        jsulmJ Offline
                        jsulmJ Offline
                        jsulm
                        Lifetime Qt Champion
                        wrote on last edited by
                        #12

                        @mrjj said in Deploying Application on Linux:

                        Also there was talk about -unsupported-allow-new-glibc options but it did not
                        know that option

                        See https://github.com/probonopd/linuxdeployqt/blob/master/tools/linuxdeployqt/main.cpp
                        It's -unsupported-bundle-everything or -unsupported-allow-new-glibc

                        https://forum.qt.io/topic/113070/qt-code-of-conduct

                        1 Reply Last reply
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