From bb86f32181437d7fd3f5641c6875a7174ac4df17 Mon Sep 17 00:00:00 2001
From: Evgeny Zinoviev <me@ch1p.io>
Date: Thu, 13 Oct 2022 21:41:00 +0300
Subject: initial

---
 extract-blobs-from-zip.sh | 162 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 162 insertions(+)
 create mode 100755 extract-blobs-from-zip.sh

diff --git a/extract-blobs-from-zip.sh b/extract-blobs-from-zip.sh
new file mode 100755
index 0000000..5d0f872
--- /dev/null
+++ b/extract-blobs-from-zip.sh
@@ -0,0 +1,162 @@
+#!/bin/bash
+
+# related documentation:
+# https://wiki.lineageos.org/extracting_blobs_from_zips
+
+set -e
+#set -x
+
+BOLD=$(tput bold)
+RST=$(tput sgr0)
+RED=$(tput setaf 1)
+GREEN=$(tput setaf 2)
+YELLOW=$(tput setaf 3)
+CYAN=$(tput setaf 6)
+
+PROGNAME="$0"
+
+echoinfo() {
+	>&2 echo "${CYAN}$@${RST}"
+}
+
+echoerr() {
+	>&2 echo "${RED}${BOLD}error:${RST}${RED} $@${RST}"
+}
+
+echowarn() {
+	>&2 echo "${YELLOW}${BOLD}warning:${RST}${YELLOW} $@${RST}"
+}
+
+die() {
+    echoerr "$@"
+    exit 1
+}
+
+usage() {
+	cat <<-_EOF 
+	usage: $PROGNAME OPTIONS
+
+	Options:
+	    -i|--input FILE  Path to installable zip
+	    -o|--output DIR  Directory to extract to
+	    --skip-unzipping
+	    --los-device-directory DIR
+
+	_EOF
+	exit 1
+}
+
+installed() {
+	command -v "$1" > /dev/null
+	return $?
+}
+
+block_ota() {
+	[ -d system ] && die "system: directory already exists!"
+	[ -f super.transfer.list ] && die "super.transfer.list: not supported"
+
+	local f= file=
+	for f in system vendor; do
+		if [ ! -f "${f}.new.dat.br" ]; then continue; fi
+		echoinfo "extracting $f..."
+		brotli --decompress --output="${f}.new.dat" "${f}.new.dat.br"
+		sdat2img.py "${f}.transfer.list" "${f}.new.dat" "${f}.img"
+	done
+
+	mkdir system
+	[ -f vendor.img ] && mkdir system/vendor
+
+	echoinfo "mounting system..."
+	sudo mount system.img system/
+
+	if [ -f vendor.img ]; then
+		echoinfo "mounting vendor..."
+		sudo mount vendor.img system/vendor/
+	fi
+
+	local workdir="$(pwd)"
+	pushd "$LOS_DEVICE_DIR"
+	echoinfo "launching extract-files.sh..."
+	./extract-files.sh "$workdir"
+	popd
+
+	if [ -f vendor.img ]; then
+		echoinfo "unmounting vendor..."
+		sudo umount system/vendor/
+	fi
+
+	echoinfo "unmounting system..."
+	sudo umount system/
+}
+
+payload_ota() {
+	die "payload_ota: not implemented"
+}
+
+filebased_ota() {
+	die "filebased_ota: not implemented"
+}
+
+[[ $# -lt 1 ]] && usage
+for prog in brotli sdat2img.py; do
+	if ! installed $prog; then
+		die "$prog: command not found"
+	fi
+done
+
+INPUT=
+OUTPUT=
+SKIP_UNZIP=
+LOS_DEVICE_DIR=
+
+while [[ $# -gt 0 ]]; do
+	case $1 in
+		-i|--input)
+			INPUT="$2"
+			shift
+			;;
+
+		-o|--output)
+			OUTPUT="$2"
+			shift
+			;;
+
+		--los-device-directory)
+			LOS_DEVICE_DIR="$2"
+			shift
+			;;
+			
+		--skip-unzipping)
+			SKIP_UNZIP=1
+			;;
+
+		*)
+			die "unrecognized option $1"
+			exit 1
+			;;
+	esac
+	shift
+done
+
+[ -z "$INPUT" ] && die "no input file specified"
+[ -z "$OUTPUT" ] && die "no output directory specified"
+[ -z "$LOS_DEVICE_DIR" ] && die "no lineageos device directory specified"
+[ -d "$LOS_DEVICE_DIR" ] || die "$LOS_DEVICE_DIR: no such directory"
+[ -f "$INPUT" ] || die "$INPUT: no such file"
+[ -z "$SKIP_UNZIP" ] && [ -d "$OUTPUT" ] && die "$OUTPUT: directory already exists"
+
+if [ -z "$SKIP_UNZIP" ]; then
+	unzip -d "$OUTPUT" "$INPUT"
+elif [ ! -d "$OUTPUT" ]; then
+	die "$OUTPUT: no such directory"
+fi
+
+pushd "$OUTPUT"
+if [ -f payload.bin ]; then
+	payload_ota
+elif [ -f system.transfer.list ]; then
+	block_ota
+else
+	filebased_ota
+fi
+popd
-- 
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