Being both nonprivileged and root inside Docker container












0














I want to use pandoc inside docker. The image looks like this:



FROM debian:buster-slim
RUN apt-get update && apt-get install -y pandoc texlive
WORKDIR /home


This is build.sh inside the project:



cp *.ttf /usr/local/share/fonts/ && fc-cache;
pandoc -o output.pdf input.md


that I want to run like this:



docker run --rm -t -v $(pwd):/home pandoc_container build.sh


This results in output.pdf being owned by root on my host. When doing:



docker run --user $(id -u) --rm -t -v $(pwd):/home pandoc_container build.sh


instead, the file will be owned by me, but the font files can not be copied to that dir, due to missing write permissions. Adding



RUN chmod a+w /usr/local/share/fonts/


to the Dockerfile solves this, but then the command fc-cache fails with a lot of failed to write cache errors also due to missing write permissions in lots of directories.



Copying the font files to ~/.fonts will not work either, because the user created by --user $(id -u) does not actually exist in the container:



I have no name!@0d9c6a272ae1:/home$


and thus does not have a home directory, which could be parsed by fc-cache.



What's an elegant way to solve this problem?










share|improve this question



























    0














    I want to use pandoc inside docker. The image looks like this:



    FROM debian:buster-slim
    RUN apt-get update && apt-get install -y pandoc texlive
    WORKDIR /home


    This is build.sh inside the project:



    cp *.ttf /usr/local/share/fonts/ && fc-cache;
    pandoc -o output.pdf input.md


    that I want to run like this:



    docker run --rm -t -v $(pwd):/home pandoc_container build.sh


    This results in output.pdf being owned by root on my host. When doing:



    docker run --user $(id -u) --rm -t -v $(pwd):/home pandoc_container build.sh


    instead, the file will be owned by me, but the font files can not be copied to that dir, due to missing write permissions. Adding



    RUN chmod a+w /usr/local/share/fonts/


    to the Dockerfile solves this, but then the command fc-cache fails with a lot of failed to write cache errors also due to missing write permissions in lots of directories.



    Copying the font files to ~/.fonts will not work either, because the user created by --user $(id -u) does not actually exist in the container:



    I have no name!@0d9c6a272ae1:/home$


    and thus does not have a home directory, which could be parsed by fc-cache.



    What's an elegant way to solve this problem?










    share|improve this question

























      0












      0








      0







      I want to use pandoc inside docker. The image looks like this:



      FROM debian:buster-slim
      RUN apt-get update && apt-get install -y pandoc texlive
      WORKDIR /home


      This is build.sh inside the project:



      cp *.ttf /usr/local/share/fonts/ && fc-cache;
      pandoc -o output.pdf input.md


      that I want to run like this:



      docker run --rm -t -v $(pwd):/home pandoc_container build.sh


      This results in output.pdf being owned by root on my host. When doing:



      docker run --user $(id -u) --rm -t -v $(pwd):/home pandoc_container build.sh


      instead, the file will be owned by me, but the font files can not be copied to that dir, due to missing write permissions. Adding



      RUN chmod a+w /usr/local/share/fonts/


      to the Dockerfile solves this, but then the command fc-cache fails with a lot of failed to write cache errors also due to missing write permissions in lots of directories.



      Copying the font files to ~/.fonts will not work either, because the user created by --user $(id -u) does not actually exist in the container:



      I have no name!@0d9c6a272ae1:/home$


      and thus does not have a home directory, which could be parsed by fc-cache.



      What's an elegant way to solve this problem?










      share|improve this question













      I want to use pandoc inside docker. The image looks like this:



      FROM debian:buster-slim
      RUN apt-get update && apt-get install -y pandoc texlive
      WORKDIR /home


      This is build.sh inside the project:



      cp *.ttf /usr/local/share/fonts/ && fc-cache;
      pandoc -o output.pdf input.md


      that I want to run like this:



      docker run --rm -t -v $(pwd):/home pandoc_container build.sh


      This results in output.pdf being owned by root on my host. When doing:



      docker run --user $(id -u) --rm -t -v $(pwd):/home pandoc_container build.sh


      instead, the file will be owned by me, but the font files can not be copied to that dir, due to missing write permissions. Adding



      RUN chmod a+w /usr/local/share/fonts/


      to the Dockerfile solves this, but then the command fc-cache fails with a lot of failed to write cache errors also due to missing write permissions in lots of directories.



      Copying the font files to ~/.fonts will not work either, because the user created by --user $(id -u) does not actually exist in the container:



      I have no name!@0d9c6a272ae1:/home$


      and thus does not have a home directory, which could be parsed by fc-cache.



      What's an elegant way to solve this problem?







      docker pandoc fontconfig






      share|improve this question













      share|improve this question











      share|improve this question




      share|improve this question










      asked Dec 12 '18 at 17:37









      mcnesium

      2842415




      2842415






















          1 Answer
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          0














          The answer is as easy as adding



          chown $UID output.pdf


          to build.sh and then passing docker an env-var instead of the user id:



          docker run -e UID=$(id -u) --rm -t -v $(pwd):/home pandoc_container build.sh





          share|improve this answer





















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            1 Answer
            1






            active

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            oldest

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            active

            oldest

            votes









            0














            The answer is as easy as adding



            chown $UID output.pdf


            to build.sh and then passing docker an env-var instead of the user id:



            docker run -e UID=$(id -u) --rm -t -v $(pwd):/home pandoc_container build.sh





            share|improve this answer


























              0














              The answer is as easy as adding



              chown $UID output.pdf


              to build.sh and then passing docker an env-var instead of the user id:



              docker run -e UID=$(id -u) --rm -t -v $(pwd):/home pandoc_container build.sh





              share|improve this answer
























                0












                0








                0






                The answer is as easy as adding



                chown $UID output.pdf


                to build.sh and then passing docker an env-var instead of the user id:



                docker run -e UID=$(id -u) --rm -t -v $(pwd):/home pandoc_container build.sh





                share|improve this answer












                The answer is as easy as adding



                chown $UID output.pdf


                to build.sh and then passing docker an env-var instead of the user id:



                docker run -e UID=$(id -u) --rm -t -v $(pwd):/home pandoc_container build.sh






                share|improve this answer












                share|improve this answer



                share|improve this answer










                answered Dec 13 '18 at 13:47









                mcnesium

                2842415




                2842415






























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