将Arch GNU/Linux 安装到磁盘文件(loop) - 无忧启动论坛

dd if=/dev/zero of=/mnt/sda9/Arch/Arch-i686.img bs=1M count=3500

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mkfs.reiserfs /mnt/sda9/Arch/Arch-i686.img

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sudo mount /mnt/sda9/Arch/Arch-i686.img /tmp/install

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sudo tar cvpf - / --exclude=/mnt --exclude=/media --exclude=/sys \
--exclude=/proc --exclude=/var/abs --exclude=/var/cache/pacman/pkg \
--exclude=/var/lib/pacman/sync | sudo tar xvpf - -C /tmp/install

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sudo mkdir /tmp/install/sys

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/dev/loop0 / reiserfs defaults 0 1

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run_hook ()
{
if [ "x$loopfile" != "x" ]; then
mount_handler="loop_mount_handler"
fi
}
# $1 /new_root
loop_mount_handler ()
{
# 启动参数指定 real_root=loop=/dev/sda1 loopfile=Arch/archlive.disk
# 或者指定 real_root=loop=/dev/disk/by-label/C loopfile=Arch/archlive.disk (label有中文得时候会出错)
# 或者指定 real_root=loop=/dev/disk/by-uuid/047C-F52A loopfile=Arch/archlive.disk
# 上面的例子中"sda1" "C" "047C-F52A" 根据具体情况对应替代，或者用*花建议得grub2自动探测
#echo "run automount hook begin"
if [ "x$1" = "x" ]; then
UNION="/new_root"
else
UNION="$1"
fi
# 保险点，根据Arch目前风格，再检测、创建目录
if [ "x$HOST" = "x" ]; then HOST="/host"; fi
if [ ! -d $HOST ]; then mkdir -p $HOST; fi
if [ ! -d $UNION ]; then mkdir -p $UNION; fi
case ${real_root} in loop\=*)
loop=${real_root/loop=}
case $loop in *by-uuid*)
if [ ! -e $loop ]; then
loop_lowercase="$(dirname $loop)/$(echo $(basename $loop) | tr [:upper:] [:lower:])"
loop_uppercase="$(dirname $loop)/$(echo $(basename $loop) | tr [:lower:] [:upper:])"
if [ -e ${loop_lowercase} ]; then
loop="${loop_lowercase}"
elif [ -e ${loop_uppercase} ]; then
loop="${loop_uppercase}"
fi
fi
;;
esac
if [ -e $loop ]; then
fstype=$(blkid -u filesystem -o value -s TYPE -p "${loop}")
fsopt="-t $fstype"
MOUNT="mount"
if [ "${readwrite}" = "no" ]; then rwopt="ro"; else rwopt="rw"; fi
case $fstype in
ntfs) MOUNT="mount.ntfs-3g"
rwopt="rw"
fsopt=""
;;
vfat) rwopt="rw"
;;
squashfs|iso9660|udf) rwopt="ro"
;;
esac
if [ "x$mountopts" != "x" ]; then
mountopts="-o $mountopts,$rwopt"
else
mountopts="-o $rwopt"
fi
$MOUNT $fsopt $mountopts $loop $HOST
if [ -f $HOST/$loopfile ]; then
loopfile="$HOST/$loopfile"
fstype=$(blkid -u filesystem -o value -s TYPE -p "${loopfile}")
if [ "${fstype}" = "squashfs" ]; then rwopt="ro"; fi
#echo "mount -t $fstype -o loop,$rwopt $loopfile $UNION"
mount -t $fstype -o loop,$rwopt $loopfile $UNION
if [ $? -eq 0 ] ; then
echo "mkdir -p $UNION$HOST"
mkdir -p $UNION$HOST
# 将存放loop的分区挂载到目标系统的/host目录下，跟wubi的处理方式相同
#echo "mount -o bind $HOST $UNION$HOST"
mount -o bind $HOST $UNION$HOST
MOUNTED=1
else
echo " mount -t $fstype -o loop,$rwopt $loopfile $UNION error"
fi
else
echo "$HOST/$loopfile is not file"
fi
else
echo "${loop} not exist!"
fi
;;
esac
#echo "run automount hook end"
}

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install ()
{
MODULES=" $(checked_modules "/usb/host" | grep -ve "_cs" -e "sl811-hcd" -e "isp116x-hcd")"
MODULES=$(echo ${MODULES}) #trim whitespace
if [ -n "${MODULES}" ]; then
MODULES="${MODULES} usb_storage sd_mod sr_mod"
MODULES="${MODULES} $(checked_modules "drivers/usb/storage/ums-*")"
fi
MODULES="${MODULES} nls_utf8 cp936"
BINARIES="blkid mount.ntfs-3g tr"
FILES=""
SCRIPT="automount"
}
help ()
{
cat<<HELPEOF
This hook auto mount the root device base on cmdline.
Can support:
1. Boot from normal harddisk or USB disk;
2. Boot from CD-ROM or DVD-ROM;
3. Boot from loop device file (made by dd or other tools);
4. Boot from squashfs files;
...
HELPEOF
}

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HOOKS="base udev autodetect pata scsi sata filesystems automount"

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sudo mount -o bind /sys /tmp/install/sys
sudo chroot /tmp/install mkinitcpio -p kernel26

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menuentry "Arch i686 (on loop 虚拟盘)" {
insmod part_msdos
insmod reiserfs
insmod loopback
#set img_label=winxp #指定分区卷标label时使用
set img_file=Arch/Arch-i686.img #设定查找标的
search --file --no-floppy --set=img_root /$img_file #直接搜索loop文件
#search --label --no-floppy --set=img_root $img_label #查找指定分区卷标label方式
#loopback loop0 (hd0,msdos9)/$img_file #直接指定loop文件位置
probe $img_root -l --set=img_label #探测分区卷标label ,目标label 不能有中文等无法识别的字符
#probe $img_root -u --set=img_root_uuid #探测uuid 但测试发现因为大小写问题导致linux的by-uuid值不匹配
loopback loop0 ($img_root)/$img_file
set root=(loop0)
linux /boot/vmlinuz26 real_root=loop=/dev/disk/by-label/$img_label loopfile=$img_file quiet
#linux /boot/vmlinuz26 real_root=loop=/dev/disk/by-uuid/$img_root_uuid loopfile=$img_file quiet
# 此处还可以用if等判断，来灵活使用label或者uuid，欢迎高手指导
initrd /boot/kernel26-fallback.img
}

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