flashize-ext

#!/bin/bash

#####################################################
# Flashize-Ext                                      #
# Copyright 2016, Lanchon                           #
#####################################################

#####################################################
# Flashize is free software licensed under GNU's    #
# General Public License (GPL) version 3 and any    #
# later version.                                    #
# ------------------------------------------------- #
# The Flashize Runtime is free software licensed    #
# under GNU's Lesser General Public License (LGPL)  #
# version 3 and any later version.                  #
#####################################################

set -e
set -o pipefail

script="$1"
inzip="$2"
zip="$3"
log="$4"
destdir="$5"

count=5

dir="$(dirname "$(readlink -f "$0")")"
version="$("$dir/flashize" "--version")"

if  [ "$1" == "-v" ] || [ "$1" == "--version" ] && [ $# -eq 1 ]; then
    echo "$version"
    exit
fi

error() {
    >&2 echo "$@"
}

fatal() {
    error "$@"
    exit 1
}

if [ "$inzip" == "-" ]; then inzip=""; fi
if [ "$zip" == "-" ]; then zip=""; fi
if [ "$log" == "-" ]; then log=""; fi
if [ "$destdir" == "-" ]; then destdir=""; fi

if  [ -z "$script" ] || ([ "$script" == "-" ] && [ -z "$zip" ]) || [ $# -gt $count ]; then
    error "Flashize-Ext ($version)"
    error
    error "Converts a shell script to a flashable Android recovery zip. The resulting flashable zip"
    error "automatically extracts the full content of the zipfile before invoking the script."
    error "This tool is compatible with Busybox and Toybox."
    error
    error "Usage: <input-script> [<input-zip> [<output-zip> [<runtime-logfile> [<dest-dir>]]]]"
    error
    error "Reads the script from standard input if <input-script> is a dash (-)."
    error
    error "Names the output zipfile based on <input-script> if <output-zip> is null or a dash."
    error
    error "Can create a logfile on the device at runtime, according to the value of <runtime-logfile>:"
    error "  -The absolute path of the logfile to be created."
    error "  -A relative path or filename to be interpreted against the path of the zipfile being run."
    error "  -A colon (:) to use the pathname of the zipfile being run with a '.log' extension."
    error "  -Null or a dash to disable logging."
    error
    error "This setting can be overridden by creating a '/tmp/flashize-log' file on the target device:"
    error "  -If the file is empty then enable logging to '/tmp/flashize.log'."
    error "  -Otherwise override the value of <runtime-logfile> with the contents of the file."
    error
    error "Extracts files to <dest-dir> or to '/tmp/flashize' if <dest-dir> is null or a dash."
    error
    error "Script debugging modes are enabled by creating dummy files on the target device:"
    error "  -Create '/tmp/flashize-ext-debug' to trace the user-supplied script."
    error "  -Create '/tmp/flashize-debug' to trace file extraction."
    fatal
fi

if [ "$script" != "-" ] && [ ! -f "$script" ]; then
    fatal "error: script not found"
fi

if [ -n "$inzip" ] && [ ! -f "$inzip" ]; then
    fatal "error: input zip not found"
fi

if [ -z "$destdir" ]; then
    destdir="/tmp/flashize"
fi

if [ "${destdir::1}" != "/" ]; then
    fatal "error: destination directory must be absolute"
fi

if [ -z "$zip" ]; then
    zip="$(dirname "$script")/$(basename "$script" .sh).zip"
fi

destdir="${destdir%/}/"

tmpzip="$zip.tmp"

rm -f "$tmpzip"
if [ -n "$inzip" ]; then
    cp -T "$inzip" "$tmpzip"
fi

rm -f "$zip"

# BUG: variables should be shell-quoted in the following code:

(
    cat <<EOF
#####################################################
# Flashize-Ext Runtime (${version})                 #
# Copyright 2016, Lanchon                           #
#####################################################

export FLASHIZE_EXT_VERSION='$version'
mkdir -p '$destdir' &&
cd '$destdir' &&
unzip -o "\$1" -d '$destdir' >/dev/null 2>&1
if [ \$? -ne 0 ]; then
    >&2 echo "flashize-ext: unable to extract package contents"
    exit 1
fi
[ ! -f /tmp/flashize-ext-debug ] && set +x || set -x

#####################################################

EOF
    cat "$script"
) | "$dir/flashize" - "$tmpzip" "$log"

mv "$tmpzip" "$zip"