Ytdyklly

I have binary and all resolved Qt dependencies packaged in tar.gz. I am using next yaml file for snap:

name: sample_name_lol_1

base: core18

version: '1.0.0'

summary: sample_summary_lol_2

description: |

  sample_desc_lol_3



grade: devel

confinement: devmode



parts:

  sample_name_lol_1:

    plugin: dump

    source: MyApp.tar.gz

    stage-packages: [

      ffmpeg,

      x264,

      x265,

      libopencv-core-dev,

      libopencv-imgproc-dev,

      libopencv-calib3d-dev,

      libblas-dev,

      liblapack-dev,

      libfontconfig1-dev,

      fonts-freefont-ttf,

      ttf-ubuntu-font-family

    ]



apps:

    MyApp:

        command: MyApp

        environment:

          LD_LIBRARY_PATH: $LD_LIBRARY_PATH:$SNAP/usr/lib/x86_64-linux-gnu/blas:$SNAP/usr/lib/x86_64-linux-gnu/lapack

Normal application run (say from regular unpacking tar.gz) would give me information about all fonts available on the system. However snap run (sample_name_lol_1.MyApp) won't see system fonts, only few of them (only 3 to be precise - sans, sans-serif, monospace). I found path after installation, /snap/sample_name_lol_1/x1/usr/share/fonts and /snap/sample_name_lol_1/x1/etc/fonts. Those places are read-only and I can't figure out, what exactly should be done, so Qt application will able to see at lease standard Ubuntu font.

I had to work with user configuration folder that snap creates.

1. Create wrapper and use as main app. Wrapper will call actual application.


2. Before starting application, wrapper will copy file from $SNAP/etc/fonts/fonts.conf to $SNAP_USER_DATA/.config/fontconfig/fonts.conf.


3. Also application will modify newly copied file using "sed -i" command, where directories were changed to $SNAP location. Example: <dir>/usr/fonts... will become <dir>/snap/your_app/version/...

It doesn't seem like a clean solution, however it's acceptable solution for me by now.

name: sample_name

base: core18

version: '1.0.0'

summary: Sample Summary

description: |

  Sample Desc



grade: devel

confinement: devmode



parts:

  sample_name:

    plugin: dump

    source: sample_name.tar.gz

    stage-packages: [

      ffmpeg,

      x264,

      x265,

      libopencv-core-dev,

      libopencv-imgproc-dev,

      libopencv-calib3d-dev,

      libblas-dev,

      liblapack-dev,

      ttf-ubuntu-font-family

    ]

  fix-fontconfig:

    plugin: nil

    override-build: |

      mkdir $SNAPCRAFT_PART_INSTALL/bin

      echo "mkdir $SNAP_USER_DATA/.config" >> $SNAPCRAFT_PART_INSTALL/bin/sample-wrapper.sh

      echo "mkdir $SNAP_USER_DATA/.config/fontconfig" >> $SNAPCRAFT_PART_INSTALL/bin/sample-wrapper.sh

      echo "cp $SNAP/etc/fonts/fonts.conf $SNAP_USER_DATA/.config/fontconfig/fonts.conf" >> $SNAPCRAFT_PART_INSTALL/bin/sample-wrapper.sh

      echo "sed -i "s#<dir>/usr#<dir>$SNAP/usr#g" $SNAP_USER_DATA/.config/fontconfig/fonts.conf" >> $SNAPCRAFT_PART_INSTALL/bin/sample-wrapper.sh

      echo "$SNAP/sample_name" >> $SNAPCRAFT_PART_INSTALL/bin/sample-wrapper.sh

    after: [sample_name]



apps:

    sample_name:

        command: sh $SNAP/bin/sample-wrapper.sh

        environment:

          LD_LIBRARY_PATH: $LD_LIBRARY_PATH:$SNAP/usr/lib/x86_64-linux-gnu/blas:$SNAP/usr/lib/x86_64-linux-gnu/lapack