Chris@700: #!/bin/bash
Chris@700: 
Chris@728: targets="$@"
Chris@700: 
Chris@728: if [ t"$targets" = "" ]; then
Chris@700:     echo "Usage: $0 target-executable"
Chris@728:     exit 2
Chris@700: fi
Chris@700: 
Chris@728: for target in $targets ; do
Chris@728:     if [ ! -f "$target" ]; then
Chris@728:         echo "Error: target executable ./$target not found"
Chris@728:         exit 1
Chris@728:     fi
Chris@728: done
Chris@728: 
Chris@700: set -eu
Chris@700: 
Chris@700: pfile=/tmp/packages_$$
Chris@700: rfile=/tmp/redundant_$$
Chris@700: 
Chris@700: trap "rm -f $pfile $rfile" 0
Chris@700: echo 1>&2
Chris@700: 
Chris@728: ldd $targets | awk '{ print $3; }' | grep '^/' | while read lib; do
Chris@700:     if test -n "$lib" ; then
Chris@700: 	dpkg-query -S "$lib"
Chris@700:     fi
Chris@700:     done | grep ': ' | awk -F: '{ print $1 }' | sort | uniq > $pfile
Chris@700: 
Chris@700: echo "Packages providing required libraries:" 1>&2
Chris@700: cat $pfile 1>&2
Chris@700: echo 1>&2
Chris@700: 
Chris@700: for p in `cat $pfile`; do 
Chris@700:     echo Looking at $p 1>&2
Chris@700:     apt-cache showpkg "$p" | grep '^  ' | grep ',' | awk -F, '{ print $1; }' | \
Chris@700: 	while read d; do 
Chris@700: 	    if grep -q '^'$d'$' $pfile; then
Chris@700: 		echo $p
Chris@700: 	    fi
Chris@700:     done
Chris@700: done | sort | uniq > $rfile
Chris@700: 
Chris@700: echo "Packages that can be eliminated because other packages depend on them:" 1>&2
Chris@700: cat $rfile 1>&2
Chris@700: echo 1>&2
Chris@700: 
Chris@713: echo "Remaining packages:" 1>&2
Chris@713: cat $pfile $rfile | sort | uniq -u 1>&2
Chris@713: echo 1>&2
Chris@713: 
Chris@715: cat $pfile $rfile | sort | uniq -u | sed 's/$/,/' | fmt -1000 | sed 's/^/Depends: /' | sed 's/,$/, mercurial, python-pyqt5, python-crypto, libc6/'
Chris@700: 
Chris@700: