/usr/sbin/update-java-alternatives is in java-common 0.47.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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shopt -s dotglob
prog=$(basename $0)
usage()
{
rv=$1
cat >&2 <<-EOF
usage: $prog [--jre-headless] [--jre] [--plugin] [ -t|--test|-v|--verbose]
-l|--list [<jname>]
-s|--set <jname>
-a|--auto
-h|-?|--help
EOF
exit $rv
}
action=
uaopts='--quiet'
while [ "$#" -gt 0 ]; do
case "$1" in
-a|--auto)
[ -z "$action" ] || usage 1
action=auto;;
-hl|--jre-headless)
hlonly=yes;;
-j|--jre)
jreonly=yes;;
--plugin)
pluginonly=yes;;
-l|--list)
[ -z "$action" ] || usage 1
action=list
if [ "$#" -gt 0 ]; then
shift
jname=$1
fi
;;
-s|--set)
[ -z "$action" ] || usage 1
action=set
shift
[ "$#" -gt 0 ] || usage 1
jname=$1
;;
-t|--test)
dryrun=yes
uaopts="$uaopts --test";;
-v|--verbose)
verbose=yes
uaopts="${uaopts/--quiet/}";;
-h|-?|--help)
usage 0;;
-*)
echo "X: $1"
usage 1;;
*)
break;;
esac
shift
done
[ "$#" -eq 0 ] || usage 1
[ -n "$action" ] || usage 1
which='^(hl|jre|jdk|plugin|DUMMY) '
if [ -n "$hlonly$jreonly$pluginonly" ]; then
which='^('
[ -n "$hlonly" ] && which="${which}hl|"
[ -n "$jreonly" ] && [ -n "$hlonly" ] && which="${which}jre|"
[ -n "$jreonly" ] && [ -z "$hlonly" ] && which="${which}hl|jre|"
[ -n "$pluginonly" ] && which="${which}plugin|"
which="${which}DUMMY) "
fi
top=/usr/lib/jvm
if [ -n "$jname" ]; then
arch=$(dpkg --print-architecture)
if [ ! -x $top/$jname/bin/java ] && [ -x $top/$jname-$arch/bin/java ]; then
echo >&2 "$prog: obsolete <jname>, please use $jname-$arch instead"
jname=$jname-$arch
fi
case "$jname" in
/*) jdir=$jname; jname=$(basename $jdir);;
*) jdir=$top/$jname
esac
if [ ! -d $jdir ]; then
echo >&2 "$prog: directory does not exist: $jdir"
exit 1
fi
if [ -f $top/.$jname.jinfo ]; then
jinfo=$top/.$jname.jinfo
elif [ -f $top/$jname.jinfo ]; then
jinfo=$top/$jname.jinfo
else
echo >&2 "$prog: file does not exist: $top/.$jname.jinfo"
exit 1
fi
fi
vecho()
{
[ -z "$verbose" ] || echo >&2 "$@"
}
jinfo_files=
do_auto()
{
vecho "resetting java alternatives"
awk "/$which/ {print \$2}" $top/*.jinfo | sort -u \
| \
while read name; do
update-alternatives $uaopts --auto $name
done
}
do_list()
{
vecho "listing java alternatives:"
for i in ${jinfo:-$top/*.jinfo}; do
alias=$(basename ${i%.jinfo})
alias=${alias#.}
prio=$(awk -F= '/priority=/ {print $2}' $i)
echo $alias $prio $top/$alias
[ -n "$verbose" ] && egrep "$which" $i
done
}
do_set()
{
do_auto
awk "/$which/ {print}" $jinfo | sort -u \
| \
while read type name location; do
if [ $type = jdk -a -z "$hlonly$jreonly$pluginonly" -a ! -f $location ]; then
echo >&2 "$prog: jdk alternative does not exist: $location"
continue
fi
if [ $type = plugin -a -z "$hlonly$jreonly" -a ! -f $location ]; then
echo >&2 "$prog: plugin alternative does not exist: $location"
continue
fi
update-alternatives $uaopts --set $name $location
done
}
if [ "$action" != list ] && [ "$(id -u)" -ne 0 ]; then
echo >&2 "$prog: no root privileges"
exit 1
fi
do_$action
|