Reports on the Java class versions in an Eclipse RCP app.

summarize-java-versions.sh

#!/bin/sh

# This is a simple script to check every class file that somehow got into a
# Eclipse RCP application for its required java version.
#
# Run it in a RCP or p2 repo directory and it checks every .class file in the
# plugins for the required java version using file(1). The results will be
# written to two (redundant) reports.
#
# The script is able to handle standard bundled plugins as well as expanded
# plugins and nested jars.
#
# Requires file(1) and a bunch of other unix tools. Tries to output a
# human-readable java version number (like 1.6), but if file doesn't decode it,
# the internal class version is used, see
# http://en.wikipedia.org/wiki/Java_class_file#General_layout

plugindir=.
workdir=`mktemp -d --tmpdir javaver-XXXXX`
byPlugin=`readlink -f .`/Java-Versions-By-Plugin.txt
byVersion=`readlink -f .`/Plugins-By-Java-Version.txt

# workout real plugin directory. Either argument or cwd
if [ $# -ge 1 ]
then
    plugindir="$1"
fi

if [ -d "$plugindir/plugins" ]
then
    plugindir="$plugindir/plugins"
fi

log() {
    echo "$@" >&2
}

check_plugin() {
    plugin="$1"
    dir="$2"
    subjar="$3"
    log -n "$plugin $subjar: "
    if [ "$subjar" = "" ]
    then
	echo -n "$plugin: " >> "$byPlugin"
    else
	echo -n "$plugin/$subjar: " >> "$byPlugin"
    fi
    find "$dir" -name '*.class' -print0 \
	| xargs -0 --no-run-if-empty file \
	| sed -e 's/.*(Java \(.*\)).*/\1/' \
	      -e 's/.*, version \([0-9][0-9]\.[0-9]\).*/\1/' \
	| sort --unique \
	| while read version
	    do
		echo "$plugin" >> "$workdir/Java-$version.txt"
		log -n "$version "
		echo -n "$version " >> "$byPlugin"
	    done
    log
    echo >> "$byPlugin"
    # check subjars
    find "$dir" -name '*.jar' | while read jar
    do
	log -n "  - "
	sjar="`basename ${jar}`"
	jdir="$workdir/${plugin}___`basename ${jar} .jar`"
	mkdir "$jdir"
	fulljar="`readlink -f $jar`"
	( cd "$jdir" && jar xf "$fulljar" )
	check_plugin "$plugin" "$jdir" "$sjar"
	rm -rf "$jdir"
    done
    
}

cd "$plugindir"
for plugin in *
do
    if [ -d "$plugin" ]
    then
	check_plugin "$plugin" "$plugin"
    else
	jar="$plugin"
	plugin="`basename $jar .jar`"
	if [ "$plugin" != "$jar" ]
	then
	    dir="$workdir/$plugin"
	    mkdir "$dir"
	    fulljar="`readlink -f $jar`"
	    ( cd "$dir" && jar xf "$fulljar" )
	    check_plugin "$plugin" "$dir"
	    rm -rf "$dir"
	else
	    log "(Skipping $jar)"
	fi
    fi
done

for ver in "$workdir"/Java-*.txt
do
    echo
    echo
    echo "## `basename $ver .txt`"
    echo
    cat "$ver"
done > "$byVersion"

rm -rf "$workdir"