reinstall/trans.sh
2023-07-18 00:01:07 +08:00

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#!/bin/ash
# shellcheck shell=dash
# shellcheck disable=SC3047,SC3036,SC3010,SC3001
# alpine 默认使用 busybox ash
# 命令出错终止运行,将进入到登录界面,防止失联
set -eE
trap 'error line $LINENO return $?' ERR
catch() {
if [ "$1" != "0" ]; then
error "Error $1 occurred on $2"
fi
}
error() {
color='\e[31m'
plain='\e[0m'
echo -e "${color}Error: $*${plain}"
wall "Error: $*"
}
add_community_repo() {
if ! grep -x 'http.*/community' /etc/apk/repositories; then
alpine_ver=$(cut -d. -f1,2 </etc/alpine-release)
echo http://dl-cdn.alpinelinux.org/alpine/v$alpine_ver/community >>/etc/apk/repositories
fi
}
cp() {
# 防止 alias cp='cp -i'
command cp "$@"
}
download() {
url=$1
file=$2
echo $url
# 阿里云禁止 axel 下载
# axel https://mirrors.aliyun.com/alpine/latest-stable/releases/x86_64/alpine-netboot-3.17.0-x86_64.tar.gz
# Initializing download: https://mirrors.aliyun.com/alpine/latest-stable/releases/x86_64/alpine-netboot-3.17.0-x86_64.tar.gz
# HTTP/1.1 403 Forbidden
# axel 在 lightsail 上会占用大量cpu
# 构造 aria2 参数
# 没有指定文件名的情况
if [ -z $file ]; then
save=""
else
# 文件名是绝对路径
if [[ "$file" = "/*" ]]; then
save="-d / -o $file"
else
# 文件名是相对路径
save="-o $file"
fi
fi
# 先用 aria2 下载
if ! aria2c -x4 --allow-overwrite=true $url $save; then
# 出错再用 curl
[ -z $file ] && save="-O" || save="-o $file"
curl -L $url $save
fi
}
update_part() {
{
hdparm -z $1
partprobe $1
partx -u $1
udevadm settle
echo 1 >/sys/block/${1#/dev/}/device/rescan
} 2>/dev/null || true
}
is_efi() {
[ -d /sys/firmware/efi/ ]
}
setup_nginx() {
apk add nginx
cat <<EOF >/etc/nginx/http.d/default.conf
server {
listen 80 default_server;
listen [::]:80 default_server;
location = / {
root /;
try_files /reinstall.html /reinstall.html;
# types {
# text/plain log;
# }
}
}
EOF
# rc-service nginx start
if pgrep nginx >/dev/null; then
nginx -s reload
else
nginx
fi
}
setup_lighttpd() {
apk add lighttpd
ln -sf /reinstall.html /var/www/localhost/htdocs/index.html
rc-service lighttpd start
}
setup_tty_and_log() {
cat <<EOF >/reinstall.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta http-equiv="refresh" content="2">
</head>
<body>
<script>
window.onload = function() {
// history.scrollRestoration = "manual";
window.scrollTo(0, document.body.scrollHeight);
}
</script>
<pre>
EOF
# 显示输出到前台
# script -f /dev/tty0
for t in /dev/tty0 /dev/ttyS0 /dev/ttyAMA0; do
if [ -e $t ] && echo >$t 2>/dev/null; then
ttys="$ttys $t"
fi
done
exec > >(tee -a $ttys /reinstall.html) 2>&1
}
extract_env_from_cmdline() {
# 提取 finalos/extra 到变量
for prefix in finalos extra; do
while read -r line; do
if [ -n "$line" ]; then
key=$(echo $line | cut -d= -f1)
value=$(echo $line | cut -d= -f2-)
eval "$key='$value'"
fi
done <<EOF
$(xargs -n1 </proc/cmdline | grep "^$prefix" | sed "s/^$prefix\.//")
EOF
done
}
# 可能脚本不是首次运行,先清理之前的残留
clear_previous() {
{
# TODO: fuser and kill
qemu-nbd -d /dev/nbd0
umount /iso /wim /installer /os/installer /os
} 2>/dev/null || true
}
clear_previous
setup_tty_and_log
extract_env_from_cmdline
# 安装 nginx目标系统是 alpine 除外
# shellcheck disable=SC2154
if [ "$distro" != "alpine" ]; then
total_ram=$(free -m | awk '{print $2}' | sed -n '2p')
# 避免后面没内存安装程序谨慎起见512内存才安装
if [ $total_ram -gt 400 ]; then
# lighttpd 虽然运行占用内存少,但安装占用空间大
# setup_lighttpd
setup_nginx
fi
fi
# 找到主硬盘
# alpine 不自带lsblkliveos安装的软件也会被带到新系统所以不用lsblk
# xda=$(lsblk -dn -o NAME | grep -E 'nvme0n1|.da')
# shellcheck disable=SC2010
xda=$(ls /dev/ | grep -Ex 'sda|hda|xda|vda|xvda|nvme0n1')
# arm要手动从硬件同步时间避免访问https出错
hwclock -s
# 安装并打开 ssh
echo root:123@@@ | chpasswd
printf '\nyes' | setup-sshd
# shellcheck disable=SC2154
if [ "$sleep" = 1 ]; then
exit
fi
# shellcheck disable=SC2154
if [ "$distro" = "alpine" ]; then
# 还原改动,不然本脚本会被复制到新系统
rm -f /etc/local.d/trans.start
rm -f /etc/runlevels/default/local
# 网络
setup-interfaces -a # 生成 /etc/network/interfaces
rc-update add networking boot
# 设置
setup-keymap us us
setup-timezone -i Asia/Shanghai
setup-ntp chrony || true
# 在 arm netboot initramfs init 中
# 如果识别到rtc硬件就往系统添加hwclock服务否则添加swclock
# 这个设置也被复制到安装的系统中
# 但是从initramfs chroot到真正的系统后是能识别rtc硬件的
# 所以我们手动改用hwclock修复这个问题
rc-update del swclock boot || true
rc-update add hwclock boot || true
# 通过 setup-alpine 安装会多启用几个服务
# https://github.com/alpinelinux/alpine-conf/blob/c5131e9a038b09881d3d44fb35e86851e406c756/setup-alpine.in#L189
# acpid | default
# crond | default
# seedrng | boot
# 添加 virt-what 用到的社区仓库
add_community_repo
# 如果是 vm 就用 virt 内核
cp /etc/apk/world /tmp/world.old
apk add virt-what
if [ -n "$(virt-what)" ]; then
kernel_opt="-k virt"
fi
# 删除 virt-what 和依赖,不然会带到新系统
apk del "$(diff /tmp/world.old /etc/apk/world | grep '^+' | sed '1d' | sed 's/^+//')"
# 重置为官方仓库配置
true >/etc/apk/repositories
setup-apkrepos -1
# 安装到硬盘
# alpine默认使用 syslinux (efi 环境除外),这里强制使用 grub方便用脚本再次重装
export BOOTLOADER="grub"
printf 'y' | setup-disk -m sys $kernel_opt -s 0 /dev/$xda
exec reboot
elif [ "$distro" = "dd" ]; then
case "$img_type" in
gzip) prog=gzip ;;
xz) prog=xz ;;
esac
if [ -n "$prog" ]; then
# alpine busybox 自带 gzip xz但官方版也许性能更好
# wget -O- $img | $prog -dc >/dev/$xda
apk add curl $prog
# curl -L $img | $prog -dc | dd of=/dev/$xda bs=1M
curl -L $img | $prog -dc >/dev/$xda
sync
else
echo 'Not supported'
sleep 1m
fi
if [ "$sleep" = 2 ]; then
exit
fi
exec reboot
fi
# 目标系统非 alpine 和 dd
# 脚本开始
add_community_repo
if ! apk add util-linux aria2 grub udev hdparm e2fsprogs curl parted; then
echo 'Unable to install package!'
sleep 1m
exec reboot
fi
# 打开dev才能刷新分区名
rc-service udev start
# 反激活 lvm
# alpine live 不需要
false && vgchange -an
# 移除 lsblk 显示的分区
partx -d /dev/$xda
disk_size=$(blockdev --getsize64 /dev/$xda)
disk_2t=$((2 * 1024 * 1024 * 1024 * 1024))
# xda*1 星号用于 nvme0n1p1 的字母 p
if [ "$distro" = windows ]; then
apk add ntfs-3g-progs virt-what wimlib rsync dos2unix
# 虽然ntfs3不需要fuse但wimmount需要所以还是要保留
modprobe fuse ntfs3
if is_efi; then
# efi
apk add dosfstools
parted /dev/$xda -s -- \
mklabel gpt \
mkpart '" "' fat32 1MiB 1025MiB \
mkpart '" "' fat32 1025MiB 1041MiB \
mkpart '" "' ext4 1041MiB -6GiB \
mkpart '" "' ntfs -6GiB 100% \
set 1 boot on \
set 2 msftres on \
set 3 msftdata on
update_part /dev/$xda
mkfs.fat -F 32 -n efi /dev/$xda*1 #1 efi
echo #2 msr
mkfs.ext4 -F -L os /dev/$xda*3 #3 os
mkfs.ntfs -f -F -L installer /dev/$xda*4 #4 installer
else
# bios
parted /dev/$xda -s -- \
mklabel msdos \
mkpart primary ntfs 1MiB -6GiB \
mkpart primary ntfs -6GiB 100% \
set 1 boot on
update_part /dev/$xda
mkfs.ext4 -F -L os /dev/$xda*1 #1 os
mkfs.ntfs -f -F -L installer /dev/$xda*2 #2 installer
fi
else
# 对于红帽系是临时分区表,安装时除了 installer 分区,其他分区会重建为默认的大小
# 对于ubuntu是最终分区表因为 ubuntu 的安装器不能调整个别分区,只能重建整个分区表
if is_efi; then
# efi
apk add dosfstools
parted /dev/$xda -s -- \
mklabel gpt \
mkpart '" "' fat32 1MiB 1025MiB \
mkpart '" "' ext4 1025MiB -2GiB \
mkpart '" "' ext4 -2GiB 100% \
set 1 boot on
update_part /dev/$xda
mkfs.fat -F 32 -n efi /dev/$xda*1 #1 efi
mkfs.ext4 -F -L os /dev/$xda*2 #2 os
mkfs.ext4 -F -L installer /dev/$xda*3 #3 installer
elif [ "$disk_size" -ge "$disk_2t" ]; then
# bios 2t
parted /dev/$xda -s -- \
mklabel gpt \
mkpart '" "' ext4 1MiB 2MiB \
mkpart '" "' ext4 2MiB -2GiB \
mkpart '" "' ext4 -2GiB 100% \
set 1 bios_grub on
update_part /dev/$xda
echo #1 bios_boot
mkfs.ext4 -F -L os /dev/$xda*2 #2 os
mkfs.ext4 -F -L installer /dev/$xda*3 #3 installer
else
# bios
parted /dev/$xda -s -- \
mklabel msdos \
mkpart primary ext4 1MiB -2GiB \
mkpart primary ext4 -2GiB 100% \
set 1 boot on
update_part /dev/$xda
mkfs.ext4 -F -L os /dev/$xda*1 #1 os
mkfs.ext4 -F -L installer /dev/$xda*2 #2 installer
fi
fi
update_part /dev/$xda
# 挂载主分区
mkdir -p /os
mount /dev/disk/by-label/os /os
# 挂载其他分区
mkdir -p /os/boot/efi
if is_efi; then
mount /dev/disk/by-label/efi /os/boot/efi
fi
mkdir -p /os/installer
if [ "$distro" = windows ]; then
mount_args="-t ntfs3"
fi
mount $mount_args /dev/disk/by-label/installer /os/installer
# shellcheck disable=SC2154
if [ "$distro" = "windows" ]; then
download $iso /os/windows.iso
mkdir -p /iso
mount /os/windows.iso /iso
# 从iso复制文件
# efi: 复制boot开头的文件+efi目录到efi分区复制iso全部文件(除了boot.wim)到installer分区
# bios: 复制iso全部文件到installer分区
if is_efi; then
mkdir -p /os/boot/efi/sources/
cp -rv /iso/boot* /os/boot/efi/
cp -rv /iso/efi/ /os/boot/efi/
cp -rv /iso/sources/boot.wim /os/boot/efi/sources/
rsync -rv --exclude=/sources/boot.wim /iso/* /os/installer/
boot_wim=/os/boot/efi/sources/boot.wim
else
rsync -rv /iso/* /os/installer/
boot_wim=/os/installer/sources/boot.wim
fi
if [ -e /os/installer/sources/install.esd ]; then
install_wim=/os/installer/sources/install.esd
else
install_wim=/os/installer/sources/install.wim
fi
# 匹配映像版本
# 需要整行匹配,因为要区分 Windows 10 Pro 和 Windows 10 Pro for Workstations
# TODO: 如果无法匹配,等待用户输入?安装第一个?
image_count=$(wiminfo $install_wim | grep "Image Count:" | cut -d: -f2 | xargs)
if [ "$image_count" = 1 ]; then
# 只有一个版本就使用第一个版本
image_name=$(wiminfo $install_wim | grep -ix "Name:[[:blank:]]*.*" | cut -d: -f2 | xargs)
else
# 否则改成正确的大小写
image_name=$(wiminfo $install_wim | grep -ix "Name:[[:blank:]]*$image_name" | cut -d: -f2 | xargs)
fi
is_win7_or_win2008r2() {
echo $image_name | grep -iEw '^Windows (7|Server 2008 R2)'
}
# 变量名 使用场景
# arch_uname uname -m x86_64 aarch64
# arch_wim wiminfo x86 x86_64 ARM64
# arch virtio驱动/unattend.xml x86 amd64 arm64
# arch_xen xen驱动 x86 x64
# 将 wim 的 arch 转为驱动和应答文件的 arch
arch_wim=$(wiminfo $install_wim 1 | grep Architecture: | awk '{print $2}' | tr '[:upper:]' '[:lower:]')
case "$arch_wim" in
x86)
arch=x86
arch_xen=x86
;;
x86_64)
arch=amd64
arch_xen=x64
;;
arm64)
arch=arm64
arch_xen= # xen 没有 arm64 驱动
;;
esac
# virt-what 要用最新版
# vultr 1G High Frequency LAX 实际上是 kvm
# debian 11 virt-what 1.19 显示为 hyperv qemu
# debian 11 systemd-detect-virt 显示为 microsoft
# alpine virt-what 1.25 显示为 kvm
# 所以不要在原系统上判断具体虚拟化环境
# lscpu 也可查看虚拟化环境,但 alpine on lightsail 运行结果为 Microsoft
# 猜测 lscpu 只参考了 cpuid 没参考 dmi
# 下载 virtio 驱动
# virt-what 可能会输出多行结果,因此用 grep
drv=/os/drivers
mkdir -p $drv
if virt-what | grep aws &&
virt-what | grep kvm &&
[ "$arch_wim" = x86_64 ]; then
# aws nitro
# 只有 x64 位驱动
# https://docs.aws.amazon.com/zh_cn/AWSEC2/latest/WindowsGuide/migrating-latest-types.html
apk add unzip
if is_win7_or_win2008r2; then
download https://s3.amazonaws.com/ec2-windows-drivers-downloads/NVMe/1.3.2/AWSNVMe.zip $drv/AWSNVMe.zip
download https://s3.amazonaws.com/ec2-windows-drivers-downloads/ENA/x64/2.2.3/AwsEnaNetworkDriver.zip $drv/AwsEnaNetworkDriver.zip
else
download https://s3.amazonaws.com/ec2-windows-drivers-downloads/NVMe/Latest/AWSNVMe.zip $drv/AWSNVMe.zip
download https://s3.amazonaws.com/ec2-windows-drivers-downloads/ENA/Latest/AwsEnaNetworkDriver.zip $drv/AwsEnaNetworkDriver.zip
fi
unzip -o -d $drv/aws/ $drv/AWSNVMe.zip
unzip -o -d $drv/aws/ $drv/AwsEnaNetworkDriver.zip
elif virt-what | grep aws &&
virt-what | grep xen &&
[ "$arch_wim" = x86_64 ]; then
# aws xen
# 只有 64 位驱动
# 未测试
# https://docs.aws.amazon.com/zh_cn/AWSEC2/latest/WindowsGuide/Upgrading_PV_drivers.html
apk add unzip msitools
if is_win7_or_win2008r2; then
download https://s3.amazonaws.com/ec2-windows-drivers-downloads/AWSPV/8.3.5/AWSPVDriver.zip $drv/AWSPVDriver.zip
else
download https://s3.amazonaws.com/ec2-windows-drivers-downloads/AWSPV/Latest/AWSPVDriver.zip $drv/AWSPVDriver.zip
fi
unzip -o -d $drv $drv/AWSPVDriver.zip
msiextract $drv/AWSPVDriverSetup.msi -C $drv
mkdir -p $drv/aws/
cp -rf $drv/.Drivers/* $drv/aws/
elif virt-what | grep xen &&
[ "$arch_wim" != arm64 ]; then
# xen
# 有 x86 x64没arm64驱动
# https://xenbits.xenproject.org/pvdrivers/win/
ver='9.0.0'
# 在 aws t2 上测试,安装 xenbus 会蓝屏装了其他7个驱动后能进系统但没网络
# 但 aws 应该用aws官方xen驱动所以测试仅供参考
parts='xenbus xencons xenhid xeniface xennet xenvbd xenvif xenvkbd'
mkdir -p $drv/xen/
for part in $parts; do
download https://xenbits.xenproject.org/pvdrivers/win/$ver/$part.tar $drv/$part.tar
tar -xf $drv/$part.tar -C $drv/xen/
done
elif virt-what | grep kvm; then
# virtio
# x86 x64 arm64 都有
# https://fedorapeople.org/groups/virt/virtio-win/direct-downloads/stable-virtio/
case $(echo "$image_name" | tr '[:upper:]' '[:lower:]') in
'windows server 2022'*) sys=2k22 ;;
'windows server 2019'*) sys=2k19 ;;
'windows server 2016'*) sys=2k16 ;;
'windows server 2012 R2'*) sys=2k12R2 ;;
'windows server 2012'*) sys=2k12 ;;
'windows server 2008 R2'*) sys=2k8R2 ;;
'windows server 2008'*) sys=2k8 ;;
'windows 11'*) sys=w11 ;;
'windows 10'*) sys=w10 ;;
'windows 8.1'*) sys=w8.1 ;;
'windows 8'*) sys=w8 ;;
'windows 7'*) sys=w7 ;;
'windows vista'*) sys=2k8 ;; # virtio 没有 vista 专用驱动
esac
case "$sys" in
# https://github.com/virtio-win/virtio-win-pkg-scripts/issues/40
w7) dir=archive-virtio/virtio-win-0.1.173-9 ;;
# https://github.com/virtio-win/virtio-win-pkg-scripts/issues/61
2k12*) dir=archive-virtio/virtio-win-0.1.215-1 ;;
*) dir=stable-virtio ;;
esac
download https://fedorapeople.org/groups/virt/virtio-win/direct-downloads/$dir/virtio-win.iso $drv/virtio-win.iso
mkdir -p $drv/virtio
mount $drv/virtio-win.iso $drv/virtio
fi
# 修改应答文件
download $confhome/Autounattend.xml /tmp/Autounattend.xml
locale=$(wiminfo $install_wim | grep 'Default Language' | head -1 | awk '{print $NF}')
sed -i "s|%arch%|$arch|; s|%image_name%|$image_name|; s|%locale%|$locale|" /tmp/Autounattend.xml
# 修改应答文件,分区配置
line_num=$(grep -E -n '<ModifyPartitions>' /tmp/Autounattend.xml | cut -d: -f1)
if is_efi; then
sed -i "s|%installto_partitionid%|3|" /tmp/Autounattend.xml
cat <<EOF | sed -i "${line_num}r /dev/stdin" /tmp/Autounattend.xml
<ModifyPartition wcm:action="add">
<Order>1</Order>
<PartitionID>1</PartitionID>
<Format>FAT32</Format>
</ModifyPartition>
<ModifyPartition wcm:action="add">
<Order>2</Order>
<PartitionID>2</PartitionID>
</ModifyPartition>
<ModifyPartition wcm:action="add">
<Order>3</Order>
<PartitionID>3</PartitionID>
<Format>NTFS</Format>
</ModifyPartition>
EOF
else
sed -i "s|%installto_partitionid%|1|" /tmp/Autounattend.xml
cat <<EOF | sed -i "${line_num}r /dev/stdin" /tmp/Autounattend.xml
<ModifyPartition wcm:action="add">
<Order>1</Order>
<PartitionID>1</PartitionID>
<Format>NTFS</Format>
</ModifyPartition>
EOF
fi
unix2dos /tmp/Autounattend.xml
# # ei.cfg
# cat <<EOF >/os/installer/sources/ei.cfg
# [Channel]
# OEM
# EOF
# unix2dos /os/installer/sources/ei.cfg
# 挂载 boot.wim
mkdir -p /wim
wimmountrw $boot_wim 2 /wim/
cp_drivers() {
src=$1
dist=$2
path=$3
[ -n "$path" ] && filter="-ipath $path" || filter=""
find $src \
$filter \
-type f \
-not -iname "*.pdb" \
-not -iname "dpinst.exe" \
-exec /bin/cp -rfv {} $dist \;
}
# 添加驱动
mkdir -p /wim/drivers
[ -d $drv/virtio ] && cp_drivers $drv/virtio /wim/drivers "*/$sys/$arch/*"
[ -d $drv/aws ] && cp_drivers $drv/aws /wim/drivers
[ -d $drv/xen ] && cp_drivers $drv/xen /wim/drivers "*/$arch_xen/*"
# win7 要添加 bootx64.efi 到 efi 目录
[ $arch = amd64 ] && boot_efi=bootx64.efi || boot_efi=bootaa64.efi
if is_efi && [ ! -e /os/boot/efi/efi/boot/$boot_efi ]; then
mkdir -p /os/boot/efi/efi/boot/
cp /wim/Windows/Boot/EFI/bootmgfw.efi /os/boot/efi/efi/boot/$boot_efi
fi
# 复制应答文件
cp /tmp/Autounattend.xml /wim/
# 提交修改 boot.wim
wimunmount --commit /wim/
# windows 7 没有 invoke-webrequest
# installer分区盘符不一定是D盘
# 所以复制 resize.bat 到 install.wim
# TODO: 由于esd文件无法修改要将resize.bat放到boot.wim
if [[ "$install_wim" = "*.wim" ]]; then
wimmountrw $install_wim "$image_name" /wim/
download $confhome/resize.bat /wim/resize.bat
wimunmount --commit /wim/
fi
# 添加引导
if is_efi; then
apk add efibootmgr
efibootmgr -c -L "Windows Installer" -d /dev/$xda -p1 -l "\\EFI\\boot\\$boot_efi"
else
# 或者用 ms-sys
apk add grub-bios
grub-install --boot-directory=/os/boot /dev/$xda
cat <<EOF >/os/boot/grub/grub.cfg
set timeout=5
menuentry "reinstall" {
search --no-floppy --label --set=root installer
ntldr /bootmgr
}
EOF
fi
if [ "$sleep" = 2 ]; then
cd /
sleep infinity
fi
exec reboot
fi
# 安装 grub2
if is_efi; then
# 注意低版本的grub无法启动f38 arm的内核
# https://forums.fedoraforum.org/showthread.php?330104-aarch64-pxeboot-vmlinuz-file-format-changed-broke-PXE-installs
apk add grub-efi efibootmgr
grub-install --efi-directory=/os/boot/efi --boot-directory=/os/boot
# 添加 netboot 备用
arch_uname=$(uname -m)
cd /os/boot/efi
if [ "$arch_uname" = aarch64 ]; then
download https://boot.netboot.xyz/ipxe/netboot.xyz-arm64.efi
else
download https://boot.netboot.xyz/ipxe/netboot.xyz.efi
fi
else
apk add grub-bios
grub-install --boot-directory=/os/boot /dev/$xda
fi
# 重新整理 extra因为grub会处理掉引号要重新添加引号
for var in $(grep -o '\bextra\.[^ ]*' /proc/cmdline | xargs); do
extra_cmdline="$extra_cmdline $(echo $var | sed -E "s/(extra\.[^=]*)=(.*)/\1='\2'/")"
done
grub_cfg=/os/boot/grub/grub.cfg
# 新版grub不区分linux/linuxefi
# shellcheck disable=SC2154
if [ "$distro" = "ubuntu" ]; then
download $iso /os/installer/ubuntu.iso
# 正常写法应该是 ds="nocloud-net;s=https://xxx/" 但是甲骨文云的ds更优先自己的ds根本无访问记录
# $seed 是 https://xxx/
cat <<EOF >$grub_cfg
set timeout=5
menuentry "reinstall" {
# https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1851311
# rmmod tpm
search --no-floppy --label --set=root installer
loopback loop /ubuntu.iso
linux (loop)/casper/vmlinuz iso-scan/filename=/ubuntu.iso autoinstall noprompt noeject cloud-config-url=$ks $extra_cmdline ---
initrd (loop)/casper/initrd
}
EOF
else
download $vmlinuz /os/vmlinuz
download $initrd /os/initrd.img
download $squashfs /os/installer/install.img
cat <<EOF >$grub_cfg
set timeout=5
menuentry "reinstall" {
search --no-floppy --label --set=root os
linux /vmlinuz inst.stage2=hd:LABEL=installer:/install.img inst.ks=$ks $extra_cmdline
initrd /initrd.img
}
EOF
fi
reboot