erofs

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#!/bin/bash -
#===============================================================================
#
#          FILE: get_erofs.sh
#
#         USAGE: ./get_erofs.sh
#
#   DESCRIPTION:
#
#       OPTIONS: ---
#  REQUIREMENTS: ---
#          BUGS: ---
#         NOTES: ---
#        AUTHOR: YOUR NAME (),
#  ORGANIZATION:
#       CREATED: 03/01/2019 10:35:26 AM
#      REVISION:  ---
#===============================================================================

set -o nounset                                  # Treat unset variables as an error

RET_IS_UNKNOWN=0
RET_IS_DIR=1
RET_IS_SPARSE=2
RET_IS_EXT4=3
RET_IS_GZIP=4
VERSION=1.20190307.0

usage(){
	echo "check_file_type.sh version:${VERSION}"
	echo "usage"
	echo "	check_file_type.sh <image>"
	echo "notes:"
	echo "	1. xxd V1.10 27oct98 by Juergen Weigert is depend"
	echo "	   Current xxd is: "	
	echo -n "	   "
	xxd --version
	echo "	2.simg2img is depend"
	exit 1
}

checkcmd() {
    echo -n "check cmd : $1 "
    if hash $1 > /dev/null 2>&1; then
    	echo "found"
        return 0
    else
        pr_red "$1 not found"
        usage
        exit 1
    fi
}

check_file_type(){
    local src=$1

    echo  "check file: $1"
    if [ -d $src ];then
        echo  "$src is dir ret=${RET_IS_DIR}"
        # "dir"
        return ${RET_IS_DIR}
    fi

    file $src | grep sparse >/dev/null 2>&1
    if [ $? = 0 ];then
        echo  "check file: $src is sparse img ret=${RET_IS_SPARSE}"
        #return "sparse"
        return ${RET_IS_SPARSE}
    fi

    file $src | grep ext4 >/dev/null 2>&1
    if [ $? = 0 ];then
        echo  "check file: $src is ext4 img ret=${RET_IS_EXT4}"
        #return "raw ext4"
        return ${RET_IS_EXT4}
    fi

    file $src | grep gzip >/dev/null 2>&1
    if [ $? = 0 ];then
        echo  "check file: $src is gizp img ret=${RET_IS_GZIP}"
        #return "gzip"
        return ${RET_IS_GZIP}
    fi
    return ${RET_IS_UNKNOWN}
}

is_erofs_img(){
	filename=$1

	echo "check img: ${filename}"
	#xxd should be xxd V1.10 27oct98 by Juergen Weigert
	magic_erofs=$(xxd -s +1024 -l4 -ps ${filename})
	magic_ext4=$(xxd -s +1080 -l2 -ps ${filename})

	if test ${magic_erofs} == e2e1f5e0
	then
		echo "${filename} is EROFS"
		return 0
	elif test ${magic_ext4} == 53ef
	then
		echo "${filename} is EXT4"
		return 0
	else
		echo "magic_erofs: ${magic_erofs}"
		echo "magic_ext4 : ${magic_ext4}"
		echo "${filename} is unknow, NOT EROFS or EXT4 !!"
		return 1
	fi
}

main() {
	filename=$1
	filename_raw=${filename}_raw
	check_file_type ${filename}
	file_type=$?

	if [ ${file_type} -eq ${RET_IS_UNKNOWN} ];then
		is_erofs_img ${filename}
		if [ $? -eq 1 ];then
			exit 1
		fi

	elif [ ${file_type} -eq ${RET_IS_DIR} ];then
		echo "$1 is a dir, ERROR !!"
		exit 1
	elif [ ${file_type} -eq ${RET_IS_EXT4} ];then
		echo "$1 is a EXT4!!"
		exit 1
	elif [ ${file_type} -eq ${RET_IS_SPARSE} ];then
		simg2img ${filename} ${filename_raw}
		is_erofs_img ${filename_raw}
		#rm -f ${filename_raw}

	elif [ ${file_type} -eq ${RET_IS_GZIP} ];then
		tempdir=.erofs_temp
		filename_zip=${filename}.zip
		mkdir ${tempdir}
		cp ${filename} ${tempdir}/${filename_zip}
		cd ${tempdir}
		gunzip ${filename_zip}
		simg2img ${filename} ${filename_raw}
		is_erofs_img ${filename_raw}
		cd ..
		#rm -rf ${tempdir}
		exit 0
	else
		echo "$1 is unknown file type !!"
		exit 1
	fi
}

if [ $# != 1 ];then
	usage
fi

checkcmd simg2img

if [ ! -e $1 ];then
	echo "$1 is NOT exist !!!"
	usage
	exit 1
fi
main $1