/etc/cron.daily/update-flashplugin-nonfree

cron.daily.update-flashplugin-nonfree

#!/bin/bash
# cron.daily.update-flashplugin-nonfree
# Version 2.2
#
# SHORT DESCRIPTION:
#   Daily cronjob executing Debian's `update-flashplugin-nonfree' command
#
# COPYRIGHT AND LICENSING:
#   Copyright (C) 2014-2016 Daniel Rudolf <http://www.daniel-rudolf.de/>
#
#   This program is free software: you can redistribute it and/or modify
#   it under the terms of the GNU General Public License as published by
#   the Free Software Foundation, version 3 of the License only.
#
#   This program is distributed in the hope that it will be useful,
#   but WITHOUT ANY WARRANTY; without even the implied warranty of
#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
#   GNU General Public License for more details.
#
#   You should have received a copy of the GNU General Public License
#   along with this program. If not, see <http://www.gnu.org/licenses/>.

# don't output anything (except errors)
QUIET="no"

# command to execute to check whether system is on AC power or not
# prevents flashplugin updates on non-AC power; clear to disable
ON_AC_POWER_CMD="$(which on_ac_power)"

# use this URL to check whether system is online or not; clear to disable
CONNECTION_TEST_URL="http://debian.org/"

# command to execute to update the flashplugin
UPDATE_FLASH_CMD="$(which update-flashplugin-nonfree)"

if [ "$QUIET" == "yes" ]; then
    exec 1> /dev/null
fi

if [ -n "$ON_AC_POWER_CMD" ]; then
    if [ ! -x "$ON_AC_POWER_CMD" ]; then
        echo "Warning: \`on_ac_power\` not executable; assuming system is on main power..." >&2
    else
        "$ON_AC_POWER_CMD"
        POWER=$?

        # system NOT on main power - exit
        if [ $POWER -eq 1 ]; then
            exit 0
        fi
    fi
fi

function checkFlashUpdates() {
    "$UPDATE_FLASH_CMD" --status 2> /dev/null | head -n 2 | grep -oE "([0-9]+\.)*[0-9]+$" | {
        read "FLASH_INSTALLED"
        read "FLASH_AVAILABLE"

        [ -z "$FLASH_AVAILABLE" ] && exit 2
        [ "$FLASH_INSTALLED" != "$FLASH_AVAILABLE" ] && exit 1
        exit 0
    }
    return $?
}

if [ -z "$UPDATE_FLASH_CMD" ]; then
    echo "Unable to update flash plugin: \`update-flashplugin-nonfree\` not found" >&2
    exit 1
elif [ ! -x "$UPDATE_FLASH_CMD" ]; then
    echo "Unable to update flash plugin: \`update-flashplugin-nonfree\` not executable" >&2
    exit 1
else
    # check for updates
    checkFlashUpdates
    CHECK_FLASH_UPDATE_STATUS=$?

    if [ $CHECK_FLASH_UPDATE_STATUS -eq 0 ]; then
        exit 0
    elif [ $CHECK_FLASH_UPDATE_STATUS -eq 2 ]; then
        if [ -n "$CONNECTION_TEST_URL" ]; then
            wget -q --tries=10 --timeout=20 --spider "$CONNECTION_TEST_URL"
            CONNECTION_STATUS=$?
            
            if [ $CONNECTION_STATUS -eq 0 ]; then
                echo "Unable to update flash plugin: unable to determine available version" >&2
                exit 1
            elif [ $CONNECTION_STATUS -ne 4 ]; then
                echo "Unable to update flash plugin: unable to determine available version" >&2
                echo "Testing the systems internet connection using \`wget \"$CONNECTION_TEST_URL\"\` failed (exited $CONNECTION_STATUS)" >&2
                exit 1
            fi
        fi
        
        if [ "$QUIET" != "yes" ]; then
            echo "Unable to update flash plugin: unable to determine available version; system is probably not connected to the internet"
        fi
        exit 0
    fi

    # try to update flashplugin
    "$UPDATE_FLASH_CMD" --install --verbose 2>&1
    UPDATE_FLASH_STATUS=$?

    if [ $UPDATE_FLASH_STATUS -ne 0 ]; then
        echo "Unable to update flash plugin: \`update-flashplugin-nonfree --install\` failed (exited $UPDATE_FLASH_STATUS)" >&2
        exit 1
    elif [ "$QUIET" != "yes" ]; then
        # don't trust the installer...
        checkFlashUpdates
        CHECK_FLASH_UPDATE_STATUS=$?

        if [ $CHECK_FLASH_UPDATE_STATUS -eq 2 ]; then
            echo "Unable to update flash plugin: unable to determine available version after installation; internet connection suddenly lost?" >&2
            exit 1
        elif [ $CHECK_FLASH_UPDATE_STATUS -ne 0 ]; then
            echo "Unable to update flash plugin: installed and available version differ after \`update-flashplugin-nonfree --install\`" >&2
            exit 1
        fi

        exit 0
    fi
fi