KASM-2379 RealVNC vncviewer image

dockerfile-kasm-realvnc-vncviewer

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+ARG BASE_TAG="develop"
+FROM kasmweb/core-ubuntu-bionic:$BASE_TAG
+USER root
+
+ENV HOME /home/kasm-default-profile
+ENV STARTUPDIR /dockerstartup
+ENV INST_SCRIPTS $STARTUPDIR/install
+WORKDIR $HOME
+
+######### Customize Container Here ###########
+
+
+COPY ./src/ubuntu/install/realvnc_vncviewer $INST_SCRIPTS/realvnc_vncviewer/
+RUN bash $INST_SCRIPTS/realvnc_vncviewer/install_realvnc_vncviewer.sh  && rm -rf $INST_SCRIPTS/realvnc_vncviewer/
+
+COPY ./src/ubuntu/install/realvnc_vncviewer/custom_startup.sh $STARTUPDIR/custom_startup.sh
+RUN chmod +x $STARTUPDIR/custom_startup.sh
+RUN chmod 755 $STARTUPDIR/custom_startup.sh
+
+
+# Update the desktop environment to be optimized for a single application
+RUN cp $HOME/.config/xfce4/xfconf/single-application-xfce-perchannel-xml/* $HOME/.config/xfce4/xfconf/xfce-perchannel-xml/
+RUN cp /usr/share/extra/backgrounds/bg_kasm.png /usr/share/extra/backgrounds/bg_default.png
+RUN apt-get remove -y xfce4-panel
+
+######### End Customizations ###########
+
+RUN chown 1000:0 $HOME
+
+ENV HOME /home/kasm-user
+WORKDIR $HOME
+RUN mkdir -p $HOME && chown -R 1000:0 $HOME
+
+USER 1000

docs/realvnc-vncviewer/README.md

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+# About This Image
+
+This Image contains a browser-accessible version of [RealVNC vncviewer](https://www.realvnc.com/).
+
+![Screenshot][Image_Screenshot]
+
+[Image_Screenshot]: https://f.hubspotusercontent30.net/hubfs/5856039/dockerhub/image-screenshots/realvnc-vncviewer.png "Image Screenshot"
+
+# Environment Variables
+
+* `APP_ARGS` - Additional arguments to pass to the application when launched.

docs/realvnc-vncviewer/description.txt

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+RealVNC vncviewer for Kasm Workspaces

src/ubuntu/install/realvnc_vncviewer/custom_startup.sh

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+#!/usr/bin/env bash
+set -ex
+START_COMMAND="/usr/bin/vncviewer"
+PGREP="vncviewer"
+MAXIMUS="false"
+DEFAULT_ARGS=""
+ARGS=${APP_ARGS:-$DEFAULT_ARGS}
+
+options=$(getopt -o gau: -l go,assign,url: -n "$0" -- "$@") || exit
+eval set -- "$options"
+
+while [[ $1 != -- ]]; do
+    case $1 in
+        -g|--go) GO='true'; shift 1;;
+        -a|--assign) ASSIGN='true'; shift 1;;
+        -u|--url) OPT_URL=$2; shift 2;;
+        *) echo "bad option: $1" >&2; exit 1;;
+    esac
+done
+shift
+
+# Process non-option arguments.
+for arg; do
+    echo "arg! $arg"
+done
+
+FORCE=$2
+
+kasm_exec() {
+    if [ -n "$OPT_URL" ] ; then
+        URL=$OPT_URL
+    elif [ -n "$1" ] ; then
+        URL=$1
+    fi 
+    
+    # Since we are execing into a container that already has the browser running from startup, 
+    #  when we don't have a URL to open we want to do nothing. Otherwise a second browser instance would open. 
+    if [ -n "$URL" ] ; then
+        /usr/bin/filter_ready
+        /usr/bin/desktop_ready
+        $START_COMMAND $ARGS $OPT_URL
+    else
+        echo "No URL specified for exec command. Doing nothing."
+    fi
+}
+
+kasm_startup() {
+    if [ -n "$KASM_URL" ] ; then
+        URL=$KASM_URL
+    elif [ -z "$URL" ] ; then
+        URL=$LAUNCH_URL
+    fi
+
+    if [ -z "$DISABLE_CUSTOM_STARTUP" ] ||  [ -n "$FORCE" ] ; then
+
+        if [[ $MAXIMUS == 'true' ]] ; then
+            maximus &
+        fi
+
+        while true
+        do
+            if ! pgrep -x $PGREP > /dev/null
+            then
+                /usr/bin/filter_ready
+                /usr/bin/desktop_ready
+                set +e
+                $START_COMMAND $ARGS $URL
+                set -e
+            fi
+            sleep 1
+        done
+    
+    fi
+
+} 
+
+if [ -n "$GO" ] || [ -n "$ASSIGN" ] ; then
+    kasm_exec
+else
+    kasm_startup
+fi

src/ubuntu/install/realvnc_vncviewer/install_realvnc_vncviewer.sh

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+#!/usr/bin/env bash
+set -ex
+VNC_URL=$(curl -q https://www.realvnc.com/en/connect/download/viewer/linux/ | grep "DEB x64" | cut -d '"' -f6 | head -1)
+
+wget -q $VNC_URL -O vnc.deb
+apt-get update
+apt-get install -y ./vnc.deb
+rm vnc.deb
+
+cp /usr/share/applications/realvnc-vncviewer.desktop $HOME/Desktop/
+chmod +x $HOME/Desktop/realvnc-vncviewer.desktop
+chown 1000:1000 /usr/share/applications/realvnc-vncviewer.desktop
+