gather_macos_local_dylib_dependencies.sh

#! /bin/bash

#
# Script to collect macOS dependent dynamic libraries outside system paths.
#
# Author(s): Philip Lamb
#

# Get our location.
OURDIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"

function usage {
    echo "Usage: $(basename $0) [-v|--verbose] [--debug] path_to_dylib [path_to_dylib2 ...]"
    echo "Where an @rpath is found, it will be substituted for the directory containing the first dylib specified."
    exit 1
}

# -e = exit on errors
set -e
# -x = debug
#set -x

# Parse parameters
while test $# -gt 0
do
    case "$1" in
        --debug) DEBUG=
            ;;
        --verbose) VERBOSE=1
            ;;
        --search-prefix) SEARCH_PREFIXES="$SEARCH_PREFIXES $2"
        	shift
            ;;
        -v) VERBOSE=1
            ;;
        --*) echo "bad option $1"
            usage
            ;;
        *) TARGETS="$TARGETS $1"
            ;;
    esac
    shift
done
if [ -z "$TARGETS" ]; then
    echo "No target dylib specified." >&2
    exit 1;
fi

rpath_root="$(dirname "$(realpath "$(echo -n $TARGETS | cut -d' ' -f1)")")"
[[ -z ${VERBOSE} ]] || echo "Using $rpath_root as @rpath root."

system_prefixes="/System/ /usr/lib/ /lib/"
for ((i = 1; i <= $(echo -n $TARGETS | wc -w) ; i++)); do
    target=$(echo -n $TARGETS | cut -d' ' -f$i)
    
    [[ -z ${VERBOSE} ]] || echo "Examining dependencies of $target"
    deps_raw=$(otool -L $target | tail -n +3)
    while IFS= read -r line; do
        dep=$(echo -n $line | cut -d' ' -f1)
        
        # Don't bother if it's a system lib.
        for system_prefix in $system_prefixes
        do
            if [[ $dep == $system_prefix* ]]; then
            	[[ -z ${VERBOSE} ]] || echo " -- $dep -- SYSTEM LIB"
                continue 2;
            fi
        done

        # We didn't match any of the system prefixes, so it's a user lib
        [[ -z ${VERBOSE} ]] || echo " -- $dep"
        
        # Replace any '@rpath' with the target's path.
        if [[ "$dep" =~ ^@rpath/.* ]]; then
        	if [[ -f "${dep/@rpath/$rpath_root}" ]]; then
        		dep="${dep/@rpath/$rpath_root}"
        	else
 				for search_prefix in $SEARCH_PREFIXES
 				do
 					if [[ -f "${dep/@rpath/$rpath_root/$search_prefix}" ]]; then
 						dep="${dep/@rpath/$rpath_root/$search_prefix}"
 						break
 					fi
 				done
 			fi
        fi
        
        # Is it already in the list of processed deps?
        if ! [[ " $TARGETS " =~ " $dep " ]]; then
            # Append to deps list if unique.
            TARGETS="$TARGETS $dep"
        fi
    done <<< "$deps_raw"
done

echo $TARGETS