PYTHONHOME

[daiyam]

Since building VSCodium with the official version of pkg2appimage, when opening a terminal panel, we were/are getting the following error (VSCodium/vscodium#760):

Fatal Python error: init_fs_encoding: failed to get the Python codec of the filesystem encoding

That error is mostly due to the env variables: PYTHONHOME and PYTHONPATH.

To fix that issue, I had to remove those variables (VSCodium/vscodium#773) but overwriting AppRun with:

cat > AppRun <<\EOF
#!/bin/sh
HERE="$(dirname "$(readlink -f "${0}")")"
export PATH="${HERE}"/usr/bin/:"${HERE}"/usr/sbin/:"${HERE}"/usr/games/:"${HERE}"/bin/:"${HERE}"/sbin/:"${PATH}"
export LD_LIBRARY_PATH="${HERE}"/usr/lib/:"${HERE}"/usr/lib/i386-linux-gnu/:"${HERE}"/usr/lib/x86_64-linux-gnu/:"${HERE}"/usr/lib32/:"${HERE}"/usr/lib64/:"${HERE}"/lib/:"${HERE}"/lib/i386-linux-gnu/:"${HERE}"/lib/x86_64-linux-gnu/:"${HERE}"/lib32/:"${HERE}"/lib64/:"${LD_LIBRARY_PATH}"
export XDG_DATA_DIRS="${HERE}"/usr/share/:"${XDG_DATA_DIRS}"
export PERLLIB="${HERE}"/usr/share/perl5/:"${HERE}"/usr/lib/perl5/:"${PERLLIB}"
export GSETTINGS_SCHEMA_DIR="${HERE}"/usr/share/glib-2.0/schemas/:"${GSETTINGS_SCHEMA_DIR}"
export QT_PLUGIN_PATH="${HERE}"/usr/lib/qt4/plugins/:"${HERE}"/usr/lib/i386-linux-gnu/qt4/plugins/:"${HERE}"/usr/lib/x86_64-linux-gnu/qt4/plugins/:"${HERE}"/usr/lib32/qt4/plugins/:"${HERE}"/usr/lib64/qt4/plugins/:"${HERE}"/usr/lib/qt5/plugins/:"${HERE}"/usr/lib/i386-linux-gnu/qt5/plugins/:"${HERE}"/usr/lib/x86_64-linux-gnu/qt5/plugins/:"${HERE}"/usr/lib32/qt5/plugins/:"${HERE}"/usr/lib64/qt5/plugins/:"${QT_PLUGIN_PATH}"
EXEC=$(grep -e '^Exec=.*' "${HERE}"/*.desktop | head -n 1 | cut -d "=" -f 2- | sed -e 's|%.||g')
exec ${EXEC} "$@"
EOF

It's almost the same bash script as when union: true. I've removed the variables PYTHONHOME and PYTHONPATH.
I've also removed libunionpreload.so since, when present, VSCodium wasn't loading.

Is there another way to avoid to set those variables?