#!/bin/sh
# lddtree
# List direct library dependencies and their dependencies and so on.
# Something like ldd, but ldd does not separate direct dependencies.
# pk 2024-03-16 2024-05-04
# https://www.linuxquestions.org/questions/slackware-14/requests-for-current-next-15-0-15-1-a-4175706801/page294.html#post6499776
# Thanks to Petri Kaukasoina

function check {
  echo NEEDED by "$1":
  objdump -p "$1"|grep NEEDED|sed 's/ *NEEDED *//;s/$/ /;s/\./\\\./g' > $NEEDED
  ldd "$1"|grep -f $NEEDED|sed 's/ (.*//'
  echo
}

[ $# -ne 1 ] && echo 'Give a binary or a library.' && exit 1
objdump -p "$1" > /dev/null || exit 1
NEEDED=$(mktemp)
trap 'rm $NEEDED' EXIT
check "$1"
ldd "$1"|grep -v -e linux-vdso.so.1 -e linux-gate.so.1 -e statically -e 'not found' |\
sed 's/.*=> //;s/ (.*//' |\
while read line; do
  check $line
done