v7clean utility script

v7clean -- script to verify that a .deb and .udeb files are clean from armv7 code using the 'readelf' Linux utility. To use:

1. Copy the following shell script code into a file named 'v7clean'.
2. Use 'chmod 755 vclean' to make the file executable.
3. Run the utility passing one or more .deb or .udeb files on the command line.

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#!/bin/sh

working=/tmp/dpkg-v7clean_$$
v6tmp=$working/v6count
v7tmp=$working/v7count
othertmp=$working/othercount

mkdir $working

# Loop over each argument.
for package in "$@"
do
        cat /dev/null > $v6tmp
        cat /dev/null > $v7tmp
        cat /dev/null > $othertmp

        package_file=`basename $package`
        cwd=`pwd`
        cd `dirname $package`
        package_path=`pwd`/$package_file
        cd $cwd

        cd $working
        ar x $package_path
        cd $cwd

        test -d $working/data && rm -rf $working/data
        mkdir $working/data

        if [ -f $working/data.tar.gz ]; then
                tar xzf $working/data.tar.gz -C $working/data
        elif [ -f $working/data.tar.bz2 ]; then
                tar xjf $working/data.tar.bz2 -C $working/data
        elif [ -f $working/data.tar.xz ]; then
                tar xJf $working/data.tar.xz -C $working/data
        else
                echo "Uknown data format."
                exit 1
        fi

        find $working/data -type f -print0 | xargs -0 file /dev/null |
                grep '\(ELF\|ar archive\)' |
                sed 's/:.*//' |
                while read filename
        do
                readelf -A $filename |
                        grep 'Tag_CPU_arch:' |
                        sed 's|.*:\W\+\(\w\+\).*|\1|' |
                        while read arch
                do
                        case $arch in
                                v6 )    echo "ARMv6" >> $v6tmp
                                        ;;
                                v7 )    echo "ARMv7" >> $v7tmp
                                        # echo $filename
                                        ;;
                                * )     echo "other" >> $othertmp
                                        ;;
                        esac
                done
        done
        v6count=`cat $v6tmp | wc -l`
        v7count=`cat $v7tmp | wc -l`
        othercount=`cat $othertmp | wc -l`

        if [ $v7count -gt '0' ]; then
                echo v7_dirty $package_file
        else
                echo v7_clean $package_file
        fi
        # echo $package_file "ARMv6=${v6count} ARMv7=${v7count} other=${othercount}"

        rm -f $working/data.tar.*
        rm -f $working/control.tar.*
done

rm -rf $working