Chromebrew get actual runtime dependencies for a package

getdeps

#!/bin/env bash
# set -x
pkg="${1}"
CREW_LIB_PREFIX=$(crew const | grep CREW_LIB_PREFIX | awk -F = '{print $2}')

# Which packages have a needed library in CREW_LIB_PREFIX
# This is a subset of what crew whatprovides gives
whatprovidesfxn() {
  pkgdepslcl="${1}"
  filelcl=$(grep "$pkgdepslcl" /usr/local/etc/crew/meta/*.filelist | grep $CREW_LIB_PREFIX)
  packagelcl=$(echo "$filelcl" | \
  sed 's/.filelist.*//g' | sed 's:.*/::' | awk '!x[$0]++' | sed s/://g)
  echo $packagelcl
}

# What files does a package provide
crewfilesfxn() {
 pkgname="${1}"
 files=$(cat /usr/local/etc/crew/meta/${pkgname}.filelist)
 echo $files
}

pkgfiles=$(crewfilesfxn "${pkg}")
# Use readelf to determine library dependencies. (This doesn't almost 
# run a program like ldd would.
pkgdeps=$(unset lines ; for i in $pkgfiles ; \
do lines+=$(readelf -d "$i" 2>/dev/null | grep NEEDED | awk '{print $5}' \
| sed 's/\[//g' | sed 's/\]//g') ; done ; echo "$lines" | tr " " "\n" \
| awk '!x[$0]++')

pkgdeps=$(unset lines; for j in $pkgdeps ; \
do lines+=$(echo -e "\n" ; whatprovidesfxn $j); done ; \
echo "$lines" | tr " " "\n" | awk '!x[$0]++')

# Remove original package from list.
pkgdeps=$(echo $pkgdeps | tr " " "\n" | sed "/${1}/d")
pkgdepsnocore=$pkgdeps
for i in $(curl -Ls https://github.com/skycocker/chromebrew/raw/master/tools/core_packages.txt) freetype_sub
do
  file=$(basename $i)
  pkgdepsnocore=$(echo $pkgdepsnocore | tr " " "\n" | sed "/$file/d")
done
pkgdepsnocore=$(echo $pkgdepsnocore | tr " " "\n"  | sort -u )

# If no non-core packages are dependencies, then just mention the core 
# dependencies
if [ -z "${pkgdepsnocore}" ]; then
pkgdepsdisplay=$pkgdeps
else
pkgdepsdisplay=$pkgdepsnocore
fi

for i in $pkgdepsdisplay
do
echo "  depends_on '$i'"
done