update-java.sh

#!/bin/bash
#update-java
PROG_VERSION='java-update_v0.5beta';  #spaces not allowed
HELP='Easy way to maintain default Java version in $PATH';

#Copyright 2010, Bruce Ingalls GPL 3 Affero see http://www.gnu.org/ for details
#Downloads & discussion at http://www.webupd8.org/
#Contact bingalls at users dot sf dot net for licensing & additional help
#Currently supports Ubuntu, only. Likely less useful for RPM based Linux distros.
#Currently supports only full java jdk, not jre.
#Note that update-alternatives by default misses many java tools, such as 'jar'
#Known bugs:
#  Evaled zenity msgs cannot handle spaces
#  Cancelling gksudo takes half a minute.
#  Sun does not install JRE in a standard location (but JDK is always /usr/local/)
#  Does not check for Japanese environment & man pages

#BEGIN User Customizations

SUN_ROOT='/usr/local';
UBUNTU_ROOT='/usr/lib/jvm';

#i18n. Change for non-english
CHOOSE_MSG='Choose';                                   #button column
COMPRESS_MSG='Enter_sudo_password_to_compress_Java_man_pages'; #spaces not allowed
DELETE_CONFIRM_MSG='OK_to_delete_these_Java_directories?';     #spaces not allowed
DELETE_JAVA_MSG='Choose_any_Java_versions_to_DELETE!'; #Title, spaces not allowed
JAVA_VERSION_MSG='Version';                            #JAVA listing column
SELECT_JAVA_MSG='Choose_Java_version_to_update_to';    #Title, spaces not allowed

#END User Customizations

#Assume that any arg means combined help & version
if [ $1 ]; then
    echo $PROG_VERSION;
    echo $HELP;
    exit;
fi    

#If locate is active for this system, then we must add the new install.
#Running in background to avoid waiting, but might not progress adequately, before its use, below
if [ ! -z /var/lib/mlocate/mlocate.db ]; then
    gksudo updatedb&
fi

#Install zenity, if necessary (Assumes debian)
which zenity > /dev/null;
if [ $? -gt 0 ]; then
    gksudo -- apt-get install zenity;
fi

#load current java link
jdefault=`ls -dog /etc/alternatives/java 2>/dev/null | awk '{print $8}' | sed 's|/bin/java||'`

#Prepare a zenity check button dialog box
#Zenity v2.30 will support --no-cancel https://bugzilla.gnome.org/show_bug.cgi?id=593926
CHECK="zenity --list --checklist --text $DELETE_JAVA_MSG --column $CHOOSE_MSG --title $PROG_VERSION --column $JAVA_VERSION_MSG"

#Prepare a Zenity radio button dialog box
RADIO="zenity --list --radiolist --text $SELECT_JAVA_MSG --column $CHOOSE_MSG --title $PROG_VERSION --column $JAVA_VERSION_MSG"

#Populate the dialog box with all known means to locate jre directories
#Should we skip apt-get java installations ($UBUNTU_ROOT)?
#    ls -1d $UBUNTU_ROOT/java-* 2>/dev/null;
#declare -a DEL_JAVADIRS  deprecate this line
DEL_JAVADIRS=$(
    ls -1d $SUN_ROOT/jdk* 2>/dev/null;
    locate bin/java_vm | grep jre1. | sed 's|/bin/java_vm||'  ||
    beagle-query bin/java_vm | grep jre1. | sed 's|/bin/java_vm||' | sed 's|file://||' 2>/dev/null
    )

for j in ${DEL_JAVADIRS[*]}; do
    CHECK=$CHECK" FALSE "$j;
done

#Grab all the Java directories to be uninstalled
if [ ${#DEL_JAVADIRS} -gt 0 ]; then
    DELDIR=`$CHECK`;
fi
if [ ${#DELDIR} -gt 0 ]; then
    zenity --question --text $DELETE_CONFIRM_MSG --title $PROG_VERSION;
    if [ $? -eq 0 ]; then
        DELETE=`echo ${DELDIR[*]}|tr '|' ' '`;
        `gksudo -- rm -fr $DELETE`;
        for j in ${deldir[*]}; do
            for f in "$j/man/man1/*"; do
                name=`basename $f .1.gz`;
                if [ ! -f "$j/man/man1/$name.1.gz" ]; then
                    name=`basename $f .1`;          #handle any legacy uncompressed pages
                fi
                gksudo -- update-alternatives --remove $name $j/bin/$name
            done
            #File links without man pages
            gksudo -- update-alternatives --remove java_vm $j/bin/java_vm
            gksudo -- update-alternatives --remove jcontrol $j/bin/jcontrol
            
            #File links that apt-get misses
            gksudo -- update-alternatives --remove libnpjp2.so $j/jre/lib/i386/libnpjp2.so
       done
    fi
fi

#Populate the dialog box with located jre directories
#declare -a JAVADIRS
JAVADIRS=$(
    ls -1d $UBUNTU_ROOT/java-* 2>/dev/null;
    ls -1d $UBUNTU_ROOT/jdk-* 2>/dev/null;
    ls -1d $UBUNTU_ROOT/jdk* 2>/dev/null;
    ls -1d $SUN_ROOT/jdk* 2>/dev/null;
    locate bin/java_vm | grep jre1. | sed 's|/bin/java_vm||'  ||
    beagle-query bin/java_vm | grep jre1. | sed 's|/bin/java_vm||' | sed 's|file://||' 2>/dev/null
    )

for j in ${JAVADIRS[*]}; do
    if [ $j == $jdefault ];then
        RADIO=$RADIO" TRUE "$j;
    else
        RADIO=$RADIO" FALSE "$j;
    fi
done

#Grab the new Java link from the radio dialog box 
NEWDIR=`$RADIO`;
gksudo -D $COMPRESS_MSG -- gzip -9 $NEWDIR/man/man1/*.1 >/dev/null 2>&1 &

if [ $? -gt 0 ]; then exit 2; fi                #cancel clicked
if [[ $NEWDIR == '' ]]; then exit 3; fi   #OK clicked, but no selection

#Increment highest version by 1. DEPENDS on update-alternative msg formatting (in English)!
#Also assumes all Java helper programs (javaws, jcontrol, etc) at same version as java
LATEST=$((`update-alternatives --query java|grep Priority:|awk '{print $2}'|sort -n|tail -1`+1));

#This will issue ignorable warnings for alternatives that are not part of a group
if [ -d "$NEWDIR/man/man1" ];then
    for f in $NEWDIR/man/man1/*; do
        name=`basename $f .1.gz`;
        #some files, like jvisualvm might not be links. Further assume this for corresponding man page
        if [ ! -f "/usr/bin/$name" -o -L "/usr/bin/$name" ]; then  
            if [ ! -f "$NEWDIR/man/man1/$name.1.gz" ]; then
                name=`basename $f .1`;          #handle any legacy uncompressed pages
            fi
            gksudo -- update-alternatives --install /usr/bin/$name $name $NEWDIR/bin/$name $LATEST --slave /usr/share/man/man1/$name.1.gz $name.1.gz $NEWDIR/man/man1/$name.1.gz
        fi
    done
    #File links without man pages
    [ -f $NEWDIR/bin/java_vm ]     && gksudo -- update-alternatives --install /usr/bin/java_vm     java_vm     $NEWDIR/jre/bin/java_vm $LATEST
    [ -f $NEWDIR/bin/jcontrol ]    && gksudo -- update-alternatives --install /usr/bin/jcontrol    jcontrol    $NEWDIR/bin/jcontrol    $LATEST
else  #no man pages available
    for f in $NEWDIR/bin/*; do
        name=`basename $f`;
        if [ ! -f "/usr/bin/$name" -o -L "/usr/bin/$name" ]; then  #some files, like jvisualvm might not be links
            gksudo -- update-alternatives --install /usr/bin/$name $name $NEWDIR/bin/$name $LATEST
        fi
    done
fi


#File links that apt-get misses
[ -f $NEWDIR/bin/libnpjp2.so ] && gksudo -- update-alternatives --install /usr/lib/mozilla/plugins/libnpjp2.so libnpjp2.so $NEWDIR/jre/lib/i386/libnpjp2.so $LATEST