unlib

#!/bin/bash

# Fail fast
set -e;

# Look for tools
pbzx='pbzx';
otaa='otaa';
jcache='jcache';
if ! hash "$pbzx"; then
    pbzx="$(dirname "$0")/pbzx";
    if ! [ -x "$pbzx" ]; then
        echo "Couldn't find pbzx executable in PATH or $(dirname "$0")";
        exit 1;
    fi;
fi;
if ! hash "$otaa"; then
    otaa="$(dirname "$0")/otaa";
    if ! [ -x "$otaa" ]; then
        echo "Couldn't find otaa executable in PATH or $(dirname "$0")";
        exit 1;
    fi;
fi;
if ! hash "$jcache"; then
    jcache="$(dirname "$0")/jcache";
    if ! [ -x "$jcache" ]; then
        echo "Couldn't find jcache executable in PATH or $(dirname "$0")";
        exit 1;
    fi;
fi;

# Check arguments
if [ "$1" == '' ] || [ "${1:${#1}-4}" != '.zip' ]; then
    echo "Usage:";
    echo "    $(basename "$0") ota.zip";
    exit 1;
fi;

# Extract zip
dir="$(basename "$1")";
dir="$PWD/${dir:0:${#dir}-4}";
if [ -e "$dir" ]; then
    echo "Directory $dir already exists";
    exit 1;
fi;
unzip -q -d "$dir" "$1";

for pb in "$dir/AssetData/payloadv2/payload" "$dir/AssetData/payloadv2/payload."*; do
    if [ -e "$pb" ]; then
        "$pbzx" < "$pb" | unxz > "$pb.ota";
        "$otaa" -l "$pb.ota" | egrep '^System/Library/Caches/com.apple.dyld/dyld_shared_cache_' | while read line; do
            "$otaa" -e "$line" "$pb.ota";
        done;
    fi;
done;
if ! [ -e 'System/Library/Caches/com.apple.dyld/' ]; then
    echo 'No shared cache found. Aborting.';
    exit 1;
fi;
mv 'System/Library/Caches/com.apple.dyld/dyld_shared_cache_'* ./;
rmdir -p 'System/Library/Caches/com.apple.dyld';
for lib in 'dyld_shared_cache_'*; do
    mkdir "${lib:18}";
    cd "${lib:18}";
    "$jcache" "../$lib";
    cd '..';
done;
rm 'dyld_shared_cache_'*;

# Clean up
rm -r "$dir";