非efi固件，u盘启动刷机以后，删除硬盘分区再从u盘启动，disk id冲突导致overlay失败，quickstart刷机也失败

[jjm2473]

disk id冲突本身就是有问题的，不打算修复固件，以免引发其他问题。
打算修改quickstart的刷机程序：
1.修复启动硬盘的判断逻辑，在发生冲突的情况下能正常刷机（解析/proc/self/mountinfo来获取实际启动的磁盘）
2.增加判断disk id冲突的情况提醒用户
3.刷机以后修改disk id（参考x86的platform.sh）

[jjm2473]

clone_istoreos.sh

#!/bin/sh
# Copyright (C) 2022-2023 jjm2473@gmail.com
# Copy current running iStoreOS to other disk

. /lib/upgrade/common.sh

export_rootdevice() {
    local DEVNO=`grep -Fw /dev/root /proc/self/mountinfo | cut -d' ' -f3`
    if [ -z "$DEVNO" ]; then
        echo "Parse /proc/self/mountinfo failed!" >&2
        return 1
    fi
    local uevent=/sys/dev/block/$DEVNO/uevent
    export ROOTPART_NUM=
    if [ -e "$uevent" ]; then
        DEVTYPE=
        PARTN=
        while read line; do
            export -n "$line"
        done < "$uevent"
        if [[ "$DEVTYPE" = partition ]]; then
            export ROOTPART_NUM="$PARTN"
        fi
    fi

    if [ -z "$ROOTPART_NUM" ]; then
        echo "Unknown root partition" >&2
        return 1
    fi

    DEVNO="`cat /sys/dev/block/$DEVNO/../dev`"
    if [ -z "$DEVNO" ]; then
        echo "Get disk of root partition failed!" >&2
        return 1
    fi
    export ROOTDEV_MAJOR="${DEVNO%:*}"
    export ROOTDEV_MINOR="${DEVNO#*:}"
}

export_rootpart() {
    local var="$1" offset="$2"

    devno_to_devname $var $ROOTDEV_MAJOR:$(($ROOTDEV_MINOR + $offset))
}

devno_to_devname() {
    local var="$1" devno="$2"
    local uevent line MAJOR MINOR DEVNAME DEVTYPE

    uevent=/sys/dev/block/$devno/uevent
    if [ -e "$uevent" ]; then
        while read line; do
            export -n "$line"
        done < "$uevent"
        if [ -b "/dev/$DEVNAME" ]; then
            export "$var=$DEVNAME"
            return 0
        fi
    fi

    return 1
}

devname_to_devno() {
    local var="$1" devname="$2"
    local path="/sys/class/block/$devname/dev"
    local DEVNO
    if [ -e "$path" ]; then
        DEVNO=`cat "$path"`
        export "$var=$DEVNO"
        return 0
    fi
    return 1
}

rescan_partitions() {
    local devname="$1"
    partprobe "/dev/${devname#/dev/}"
}

efi_crc32() {
    gzip -1 -c | tail -c8 | head -c4
}

get_mbr_diskid() {
    local var="$1" devname="$2"
    local ID
    devname="/dev/${devname#/dev/}"

    ID=`dd if="$devname" bs=1 skip=440 count=4 2>/dev/null | hexdump -v -n 4 -e '/4 "0x%08x"'`
    ID=`hex_le32_to_cpu $ID`

    export "$var=$ID"

    return 0
}

set_mbr_diskid() {
    local to="$1" id="$2"
    if [ -z "$to" ]; then
        echo "devnames are empty" >&2
        return 1
    fi
    to="/dev/${to#/dev/}"

    echo -ne "$id" | dd of="$to" bs=1 seek=440 count=4 conv=notrunc,fsync 2>/dev/null

    return 0
}

xor_mbr_diskid() {
    local from="$1" mask="$2"
    local id
    if [ -z "$from" ]; then
        echo "devnames are empty" >&2
        return 1
    fi
    from="/dev/${from#/dev/}"

    get_mbr_diskid id $from
    id=`hex_le32_to_cpu $id`

    id=$(( $id ^ $mask ))

    id=`printf "0x%08x" $id`

    id=`hex_le32_to_cpu $id`

    echo "\x${id:8:2}\x${id:6:2}\x${id:4:2}\x${id:2:2}"
}

upgrade_grub_x86() {
    local devname="$1"
    local bootpart
    local devno id parttable=msdos
    devname="${devname#/dev/}"
    if [ -z "$devname" ]; then
        echo "devname is empty" >&2
        return 127;
    fi
    devname="/dev/${devname}"
    rescan_partitions "$devname"
    if part_magic_efi "$devname"; then
        set -- $(dd if="$devname" bs=1 skip=1168 count=16 2>/dev/null | hexdump -v -e '8/1 "%02x "" "2/1 "%02x""-"6/1 "%02x"')
        id="$4$3$2$1-$6$5-$8$7-$9"
        parttable=gpt
    else
        id=`dd if="$devname" bs=1 skip=440 count=4 2>/dev/null | hexdump -v -n 4 -e '/4 "%08x"'`
        id="$id-02"
    fi
    devname_to_devno devno "${devname#/dev/}"
    if devno_to_devname bootpart "${devno%:*}:$(( ${devno#*:} + 1 ))"; then
        mkdir -p /tmp/boot
        mount -o rw,noatime "/dev/$bootpart" /tmp/boot
        sed -i "s/\(PARTUUID=\)[a-f0-9-]\+/\1$id/ig" /tmp/boot/boot/grub/grub.cfg

        echo "(hd0) $devname" > /tmp/device.map
		grub-bios-setup \
			-m "/tmp/device.map" \
			-d "/tmp/boot/boot/grub" \
			-r "hd0,${parttable}1" \
			"$devname" \
		&& touch /tmp/boot/boot/grub/upgraded

        umount /tmp/boot
        return 0
    fi
    return 1
}

install_istoreos() {
    local from to="$1" lastpart lastpart_start lastpart_end mounted overlay=0 diskid offset parted_script boot_parts
    to="${to#/dev/}"
    if [ -z "$to" ]; then
        echo "devname is empty" >&2
        return 1
    fi
    if export_rootdevice; then
        if export_rootpart from 0; then
            if [[ "$from" = "$to" ]]; then
                echo "target device is busy" >&2
                return 1
            fi
            echo "boot disk: $from" >&2
            boot_parts=$ROOTPART_NUM
            if ! export_rootpart lastpart $boot_parts; then
                echo "get root part failed, maybe this is a bug" >&2
                return 1
            fi
            if grep -Fqm1 ' - squashfs /dev/root ' /proc/self/mountinfo; then
                echo "rootfs is squashfs" >&2
                if [ -f /usr/sbin/mount_root ] && export_rootpart lastpart $(( $boot_parts + 1 )); then
                    boot_parts=$(( $boot_parts + 1 ))
                    overlay=1
                fi
            fi
            lastpart_start=`cat "/sys/class/block/$lastpart/start"`
            lastpart_end=`cat "/sys/class/block/$lastpart/size"`
            lastpart_end=$(($lastpart_end + $lastpart_start))

            echo "umount /dev/$to*" >&2
            umount "/dev/$to"* 2>/dev/null
            mounted="`mount | cut -d' ' -f1 | grep -Fm1 "/dev/$to"`"
            if [ -n "$mounted" ] ; then
                echo "can not umount $mounted" >&2
                return 1
            fi

            parted -ms "/dev/$to" unit GiB print 2>/dev/null | grep -qm1 "^/dev/$to:" || {
                echo "disk $to unavalible after umount" >&2
                return 1
            }

            echo "copy data $from => $to" >&2
            if [[ "$overlay" = "1" ]]; then
                dd if="/dev/$from" of="/dev/$to" bs=8192 count=$((($lastpart_start + 15) >> 4)) conv=notrunc
                echo "RESET000" | dd of="/dev/$to" bs=512 seek=$lastpart_start count=1 conv=sync,notrunc,fsync >/dev/null 2>&1
            else
                dd if="/dev/$from" of="/dev/$to" bs=8192 count=$((($lastpart_end + 31) >> 4)) conv=notrunc
            fi

            diskid="`xor_mbr_diskid $from 0xea5e9105`"
            echo "new disk id: $diskid" >&2
            if part_magic_efi "/dev/$from"; then
                echo "patch EFI firmware" >&2

                # rebuild target disk GPT
                parted -s "/dev/$to" mktable gpt
                # disk guid
                dd if="/dev/$from" of="/dev/$to" bs=8 skip=71 seek=71 count=2 conv=notrunc,fsync 2>/dev/null
                # partitions
                dd if="/dev/$from" of="/dev/$to" bs=128 skip=8 seek=8 count=$boot_parts conv=notrunc,fsync 2>/dev/null

                # copy bios_grub partition entry
                dd if="/dev/$from" of="/dev/$to" bs=128 skip=135 seek=135 count=1 conv=notrunc,fsync 2>/dev/null

                # update disk and part uuid
                set_mbr_diskid "$to" "$diskid" || return 1
                # normal partition
                for offset in `seq 1 $boot_parts` ; do
                    echo -ne "$diskid" | dd of="/dev/$to" bs=4 seek=$(( ($offset - 1) * 0x20 + 0x104 )) count=1 conv=notrunc,fsync 2>/dev/null
                done
                # disk guid and bios_grub partition
                for offset in 142 4324 ; do
                    echo -ne "$diskid" | dd of="/dev/$to" bs=4 seek=$offset count=1 conv=notrunc,fsync 2>/dev/null
                done

                # fix GPT CRC32 of partition entries (little endian)
                dd if="/dev/$to" bs=512 skip=2 count=32 2>/dev/null | efi_crc32 | dd of="/dev/$to" bs=4 seek=150 count=1 conv=notrunc,fsync 2>/dev/null

                # fix GPT CRC32 of header
                { dd if="/dev/$to" bs=4 skip=128 count=4 2>/dev/null; 
                    dd if=/dev/zero bs=4 count=1 2>/dev/null; 
                    dd if="/dev/$to" bs=4 skip=133 count=18 2>/dev/null;
                } | efi_crc32 | dd of="/dev/$to" bs=4 seek=132 count=1 conv=notrunc,fsync 2>/dev/null

                # fix alternative GPT
                echo Fix | parted "/dev/$to" print >/dev/null
                for offset in `seq 2 $boot_parts` ; do
                    parted -s "/dev/$to" set $offset msftdata on
                done
            else
                echo "patch Legacy firmware" >&2

                # delete user partitions
                for offset in `seq $boot_parts 3` ; do
                    dd if=/dev/zero of=/dev/sda bs=2 seek=$(( $offset * 8 + 223 )) count=8 conv=notrunc,fsync 2>/dev/null
                done

                set_mbr_diskid "$to" "$diskid" || return 1
            fi
            if [[ "`uname -m`" = "x86*" ]]; then
                # update grub and cmdline partuuid for x86 platform
                upgrade_grub_x86 "$to"
            else
                rescan_partitions "$to"
            fi
            sync
            sync
            echo 3 >/proc/sys/vm/drop_caches
            echo "Success"
            return 0
        fi
    fi

    echo "unknown running root disk!" >&2

    return 1
}

[ -n "$1" -a -b "/dev/$1" ] && install_istoreos $1

[jjm2473]

作为库使用

1. 显示当前的启动盘

. ./clone_istoreos.sh
export_rootdevice
devno_to_devname bootdisk $ROOTDEV_MAJOR:$ROOTDEV_MINOR
echo "boot disk: $bootdisk"