slpm-genimg

#!/bin/sh
# --pancake 2010

if [ ! "$UID" = 0 ]; then
  echo "You need root."
  exit 1
fi

fs=10
img=image.ext2
mkfs=mke2fs
msg="\x1b[47m  \x1b[0m"

# basic devices
cd _prefix
  mkdir -p dev/pts proc sys tmp
  cd dev
    rm -f console tty null zero
    mknod -m 660 console c 5 1
    mknod -m 660 mem c 1 1
    mknod -m 660 tty c 5 0
    mknod -m 660 null c 1 3
    mknod -m 660 zero c 1 5
  cd ..
cd ..

sz=$(printf %d $(du -hs _prefix|awk '{print $1}') 2>/dev/null)
sz=$(($sz+$fs))M
printf "$msg image size: $sz\n"

cancel() {
  printf "\n$msg ^C operation cancelled\n"
  umount .mnt
  rm -rf .mnt
  rm -f $img
  exit 1
}
trap cancel INT

printf "$msg create raw disk: $img\n"
rm -f $img
# normal
#dd if=/dev/zero of=image.ext2 count=1 bs=$sz
# sparse
#dd if=/dev/zero of=$img bs=1k count=0 seek=$sz
truncate -s $sz $img

printf "$msg format: $mkfs\n"
yes | $mkfs $img

printf "$msg source root: _prefix\n"
mkdir -p .mnt
mount -o loop $img .mnt
cp -rfa _prefix/* .mnt
umount .mnt
sync
rm -rf .mnt

printf "$msg done\n"

echo
printf "$msg qemu -kernel /tmp/bzImage -hda $img -append 'root=/dev/sda init=/bin/dash'\n"
echo