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How do I run docker using QProcess?

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  • Pablo J. RoginaP Pablo J. Rogina

    @KKyul could this old post still apply to your issue?

    JonBJ Offline
    JonBJ Offline
    JonB
    wrote on last edited by
    #5

    @Pablo-J.-Rogina
    I don't really get when those authors expect that to work. They clone the calling process' stdin to pass on to the child (instead of usual redirection). But assuming your Qt app is GUI, and say launched from a desktop shortcut, it won't start with any (open) stdin to clone, will it?

    K 1 Reply Last reply
    0
    • JonBJ JonB

      @Pablo-J.-Rogina
      I don't really get when those authors expect that to work. They clone the calling process' stdin to pass on to the child (instead of usual redirection). But assuming your Qt app is GUI, and say launched from a desktop shortcut, it won't start with any (open) stdin to clone, will it?

      K Offline
      K Offline
      KKyul
      wrote on last edited by
      #6

      @JonB

      Arguments <<"/k" <<"docker exec -ti freesurfer ls -la /opt/freesurfer";

      0_1527082353776_632581e4-6803-485d-be8d-b8d54caa5fd6-image.png

      I conformed, above arguments doing well. that means, above arguments run a docker.

      "docker exec -ti freesurfer ls -la /opt/freesurfer"; -> this arguments is composed of 3 windows? command line
      (docker exec -ti freesurfer) + (opt/freesurfer) + (ls).

      1 Reply Last reply
      1
      • Pablo J. RoginaP Pablo J. Rogina

        @KKyul could this old post still apply to your issue?

        K Offline
        K Offline
        KKyul
        wrote on last edited by
        #7

        @Pablo-J.-Rogina
        Pablo-J.-Rogina

        I learned Qt 3 days....

        Arguments <<"/k" <<"docker exec -ti freesurfer" <<"export " <<"source " <<"export " <<"convert";
        CommandPrompt.startDetached("cmd", Arguments);

        Do you think is it possible syntax?? to send multiple arguments.

        JonBJ 1 Reply Last reply
        0
        • mrjjM Offline
          mrjjM Offline
          mrjj
          Lifetime Qt Champion
          wrote on last edited by
          #8

          Hi
          I used the following code to run python interactively.
          (code from https://stackoverflow.com/questions/48518442/qt-start-process-in-interactive-shell )

          #include <QProcess>
          #include <QString>
          #include <QStringList>
          #include "Windows.h"
          
          class QDetachableProcess 
                  : public QProcess {
          public:
              QDetachableProcess(QObject *parent = 0) 
                  : QProcess(parent) {
              }
              void detach() {
                 waitForStarted();
                 setProcessState(QProcess::NotRunning);
              }
          };
          
          int main(int argc, char *argv[]) {
              QDetachableProcess process;
              QString program = "cmd.exe";
              QStringList arguments = QStringList() << "/K" << "python.exe";
              process.setCreateProcessArgumentsModifier(
                          [](QProcess::CreateProcessArguments *args) {
                  args->flags |= CREATE_NEW_CONSOLE;
                  args->startupInfo->dwFlags &=~ STARTF_USESTDHANDLES;
              });
              process.start(program, arguments);
              process.detach();
              return 0;
          }
          

          However, im not sure how docker works as it seems it starts a linux bash inside ?
          So im wondering which of the shells/command promts you want to be interactive.
          The windows one, or the linux one. ( if it works thats way)

          K 1 Reply Last reply
          0
          • K KKyul

            @Pablo-J.-Rogina
            Pablo-J.-Rogina

            I learned Qt 3 days....

            Arguments <<"/k" <<"docker exec -ti freesurfer" <<"export " <<"source " <<"export " <<"convert";
            CommandPrompt.startDetached("cmd", Arguments);

            Do you think is it possible syntax?? to send multiple arguments.

            JonBJ Offline
            JonBJ Offline
            JonB
            wrote on last edited by
            #9

            @KKyul
            Please just tell us exactly what you would type in a terminal to run the command. For example, is it perhaps:

            docker exec -ti freesurfer ls -la /opt/freesurfer
            

            or does it have quotes or what?

            You keep writing:
            Arguments <<"/k" ...
            what is that /k about, and what program is this Arguments for?

            I want to execute multiple window cmd command using a QProcess? or other function

            What is "multiple window" all about? It means nothing to me.

            K 1 Reply Last reply
            1
            • mrjjM mrjj

              Hi
              I used the following code to run python interactively.
              (code from https://stackoverflow.com/questions/48518442/qt-start-process-in-interactive-shell )

              #include <QProcess>
              #include <QString>
              #include <QStringList>
              #include "Windows.h"
              
              class QDetachableProcess 
                      : public QProcess {
              public:
                  QDetachableProcess(QObject *parent = 0) 
                      : QProcess(parent) {
                  }
                  void detach() {
                     waitForStarted();
                     setProcessState(QProcess::NotRunning);
                  }
              };
              
              int main(int argc, char *argv[]) {
                  QDetachableProcess process;
                  QString program = "cmd.exe";
                  QStringList arguments = QStringList() << "/K" << "python.exe";
                  process.setCreateProcessArgumentsModifier(
                              [](QProcess::CreateProcessArguments *args) {
                      args->flags |= CREATE_NEW_CONSOLE;
                      args->startupInfo->dwFlags &=~ STARTF_USESTDHANDLES;
                  });
                  process.start(program, arguments);
                  process.detach();
                  return 0;
              }
              

              However, im not sure how docker works as it seems it starts a linux bash inside ?
              So im wondering which of the shells/command promts you want to be interactive.
              The windows one, or the linux one. ( if it works thats way)

              K Offline
              K Offline
              KKyul
              wrote on last edited by
              #10

              @mrjj said in How do I run docker using QProcess?:

              The windows one, or the linux one. ( if it works thats way)

              exactly... I want to interactive with linux shells command.

              following code

              Arguments <<"/k" <<"docker exec -ti freesurfer" <<"export FREESURFER_HOME=/opt/freesurfer" <<"source $FREESURFER_HOME/SetUpFreeSurfer.sh" <<"export SUBJECTS_DIR=/opt/freesurfer" <<"mri_convert sample-001.mgz sample-001.nii.gz";

              I want above codes are processed at once.

              1 Reply Last reply
              0
              • JonBJ JonB

                @KKyul
                Please just tell us exactly what you would type in a terminal to run the command. For example, is it perhaps:

                docker exec -ti freesurfer ls -la /opt/freesurfer
                

                or does it have quotes or what?

                You keep writing:
                Arguments <<"/k" ...
                what is that /k about, and what program is this Arguments for?

                I want to execute multiple window cmd command using a QProcess? or other function

                What is "multiple window" all about? It means nothing to me.

                K Offline
                K Offline
                KKyul
                wrote on last edited by
                #11

                @JonB said in How do I run docker using QProcess?:

                I want to execute multiple window cmd command using a QProcess? or other function

                I honestly do not know about / k It's code from the Internet....

                I want to interactive with linux shell command.

                1. "docker exec -ti freesurfer"
                  2)"export FREESURFER_HOME=/opt/freesurfer"
                  3)"source $FREESURFER_HOME/SetUpFreeSurfer.sh"
                  4)"export SUBJECTS_DIR=/opt/freesurfer"
                  5)"mri_convert sample-001.mgz sample-001.nii.gz";
                  I want to execute above those command at once!
                mrjjM JonBJ 2 Replies Last reply
                0
                • K KKyul

                  @JonB said in How do I run docker using QProcess?:

                  I want to execute multiple window cmd command using a QProcess? or other function

                  I honestly do not know about / k It's code from the Internet....

                  I want to interactive with linux shell command.

                  1. "docker exec -ti freesurfer"
                    2)"export FREESURFER_HOME=/opt/freesurfer"
                    3)"source $FREESURFER_HOME/SetUpFreeSurfer.sh"
                    4)"export SUBJECTS_DIR=/opt/freesurfer"
                    5)"mri_convert sample-001.mgz sample-001.nii.gz";
                    I want to execute above those command at once!
                  mrjjM Offline
                  mrjjM Offline
                  mrjj
                  Lifetime Qt Champion
                  wrote on last edited by
                  #12

                  Hmm but the
                  export statements are really not parameters. its bash stuff.
                  Would it be an option to put in all in convert.sh file and
                  simply run that ?

                  K 1 Reply Last reply
                  0
                  • mrjjM mrjj

                    Hmm but the
                    export statements are really not parameters. its bash stuff.
                    Would it be an option to put in all in convert.sh file and
                    simply run that ?

                    K Offline
                    K Offline
                    KKyul
                    wrote on last edited by
                    #13

                    @mrjj
                    okay! I will do make a .sh file!! thanks alot !!

                    mrjjM 1 Reply Last reply
                    0
                    • K KKyul

                      @mrjj
                      okay! I will do make a .sh file!! thanks alot !!

                      mrjjM Offline
                      mrjjM Offline
                      mrjj
                      Lifetime Qt Champion
                      wrote on last edited by
                      #14

                      @KKyul
                      I think it will work faster as im not sure if the
                      bash inside docker will see the export correctly with QProcess.
                      However, inside .sh file, it will just work as it should be in context of the bash if i read the docs right.
                      I really ought to try Docker on windows. Pretty cool tech.

                      1 Reply Last reply
                      0
                      • K KKyul

                        @JonB said in How do I run docker using QProcess?:

                        I want to execute multiple window cmd command using a QProcess? or other function

                        I honestly do not know about / k It's code from the Internet....

                        I want to interactive with linux shell command.

                        1. "docker exec -ti freesurfer"
                          2)"export FREESURFER_HOME=/opt/freesurfer"
                          3)"source $FREESURFER_HOME/SetUpFreeSurfer.sh"
                          4)"export SUBJECTS_DIR=/opt/freesurfer"
                          5)"mri_convert sample-001.mgz sample-001.nii.gz";
                          I want to execute above those command at once!
                        JonBJ Offline
                        JonBJ Offline
                        JonB
                        wrote on last edited by JonB
                        #15

                        @KKyul

                        I honestly do not know about / k It's code from the Internet....

                        OK. I'm going to guess what I think you're looking at and want.

                        You are under Windows (your Qt app, where you want to run Docker out of). The Windows shell, cmd.exe. That accepts a /k argument to remain around (as a console) after executing a command line. The command line treats the rest of the line as the command to execute first. @mrjj's code you show explicitly creates a new console in a window for the sub-process.

                        So your code would be:

                        QStringList arguments = QStringList() << "/K" << "docker exec -ti freesurfer";
                        

                        You are putting the export etc. statements in a convert.sh file (they cannot be put on the command-line). This needs executing by the docker. You have to tell it to execute that. So does docker accept a command-line e.g.

                        docker exec -ti freesurfer convert.sh
                        

                        or rather, quite probably:

                        docker exec -ti freesurfer "/bin/bash convert.sh"
                        
                        1 Reply Last reply
                        2
                        • SGaistS Offline
                          SGaistS Offline
                          SGaist
                          Lifetime Qt Champion
                          wrote on last edited by
                          #16

                          Hi,

                          As an additional test, since you have an interactive session, why not use QProcess::write with the lines you would like to execute ?

                          Interested in AI ? www.idiap.ch
                          Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

                          1 Reply Last reply
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