openrocket/snap/local/launcher

#!/bin/bash

JAVA_BIN="$JAVA_HOME/bin/java"

export DESKTOP_SESSION=gnome
export XDG_SESSION_DESKTOP=gnome
export XDG_CURRENT_DESKTOP=GNOME

JAVA_OPTS="-Dsun.java2d.xrender=true -Dprism.useFontConfig=false -Dawt.useSystemAAFontSettings=on -Dswing.aatext=true -Dswing.defaultlaf=com.sun.java.swing.plaf.gtk.GTKLookAndFeel -Dswing.crossplatformlaf=com.sun.java.swing.plaf.gtk.GTKLookAndFeel -Djava.io.tmpdir=$SNAP_USER_COMMON"

#
# Determine if we need to migrate user preferences from a previous
# installation or not. This will be determined if the dot-java-user-prefs
# interface is connected (should be autoconnected via the installation)
# and the user's $HOME/.java/.userPrefs/OpenRocket directory exists.
# Note, $HOME is remapped within a snap so it is necessary to use
# SNAP_REAL_HOME instead.
#
if snapctl is-connected dot-java-user-prefs-openrocket; then
    SRC_PREFS=$SNAP_REAL_HOME/.java/.userPrefs/OpenRocket
    TGT_PREFS=$SNAP_USER_COMMON/.java/.userPrefs/
    if [[ -d $SRC_PREFS && ! -d "$TGT_PREFS" ]]; then
        echo "Migrating user preferences from $SRC_PREFS to $TGT_PREFS"
        mkdir -p $TGT_PREFS
        cp -r "$SRC_PREFS" "$TGT_PREFS"
    fi
fi

# Configure the preferences to use $SNAP_USER_COMMON
# rather than the standard $HOME/.java/.userPrefs directory
# For security reasons, the Snap store team will not grant
# write access generically to the java user preferences storage
# as it would allow the app to read any data stored in the java
# user prefs dir. So we'll force it to use the snap.
JAVA_OPTS="$JAVA_OPTS -Djava.util.prefs.userRoot=$SNAP_USER_COMMON/"

if ! snapctl is-connected dot-openrocket; then
    JAVA_OPTS="$JAVA_OPTS -Duser.home=$SNAP_USER_COMMON/"
fi

export _JAVA_OPTIONS=$JAVA_OPTS
# Fix font / theme
export JAVA_FONTS=$SNAP/usr/share/fonts/truetype
exec $JAVA_BIN -jar $SNAP/OpenRocket.jar "$@"