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|
#!/bin/bash
die()
{
printf 'Error: %s\n' "$*" >&2
exit 1
}
KiB()
{
printf %s $(("$1" * 1024))
}
MiB()
{
KiB $(KiB "$1")
}
get_rootfs_size()
{
[ "$ROOTFS" ] || return
if [ -b "$ROOTFS" ]
then
rootfs_size=$(blockdev --getsize64 "$ROOTFS")
else
rootfs_size=$(stat -c%s "$ROOTFS")
fi
}
initialize_target()
{
if [ -b "$target" ]
then return
fi
rm -f "$target"
if [ "$ROOTFS" ]
then
get_rootfs_size
fallocate -l $(($(KiB 17) + $(MiB $end_keys) + rootfs_size)) "$target"
else
fallocate -l $(($(KiB 17) + $(MiB $end_keys))) "$target"
fi
}
# TODO: Use GUID type tags for each Samizdat partition type.
partition_target()
{
parted "$target" -sm -a optimal \
unit MiB \
mklabel gpt \
mkpart samizdat-grub 1 8 \
set 1 bios_grub on \
mkpart samizdat-keys btrfs ${start_keys} ${end_keys}
if [ -b "$target" ]
then
partx -u "$target"
fi
if [ "$ROOTFS" ]
then
parted "$target" -sm -a optimal \
mkpart samizdat-rootfs btrfs ${end_keys}MiB 100%
fi
}
make_target_bootable()
{
mkfs.btrfs -f --mixed "$part"2
mkdir -p "$mnt"
mount "$part"2 "$mnt"
mkdir -p "$mnt"/boot/grub
cp -aL "$GRUB_CONFIG" "$mnt"/boot/grub
eatmydata -- grub-install -v --boot-directory "$mnt"/boot "$dev"
sync
}
acquire_target_block_devices()
{
if [ -b "$target" ]
then
dev=$target
part=$target
mnt=/mnt/${target#/dev/}
else
trap release_target_block_devices EXIT
losetup -f "$target"
dev=$(losetup -j "$target" -O NAME --noheadings)
kpartx -vasas "$dev"
part=/dev/mapper/${dev##*/}p
mnt=$target.mnt
fi
}
release_target_block_devices()
{
(
set +e
[ -z "$mnt" ] || ! mountpoint "$mnt" || umount "$mnt"
case "$dev" in
/dev/loop*)
kpartx -d "$dev"
losetup -d "$dev"
;;
esac
true
)
unset mnt dev
}
add_keys()
{
rsync -a --info=STATS "$GPG_INPUT_DIR"/ "$mnt"/gnupghome/
}
add_initrd()
{
initrd_suffix=.samizdat
mkdir -p "$mnt"/linux
rsync -aL --info=STATS "${1}vmlinuz${2}" "$mnt"/linux/vmlinuz
rsync -aL --info=STATS "${1}initrd.img${2}${initrd_suffix}" "$mnt"/linux/initrd.img
}
add_grub_cfg()
{
mkdir -p "$mnt"/boot/grub
cp -aL "$GRUB_CONFIG" "$mnt"/boot/grub
}
individualize()
{
mkdir -p "$mnt"
mountpoint "$mnt" || mount "$part"2 "$mnt"
add_keys
add_initrd "$samizdat_linux_dir"/ "${version_suffix}"
add_grub_cfg
}
globalize()
{
initialize_target
partition_target
acquire_target_block_devices
make_target_bootable
}
sanity_checks()
{
[[ $UID = 0 ]] || die "You are not root."
for d in "$samizdat_linux_dir" "$GPG_INPUT_DIR"
do
[ -d "$d" ] || die "Not a directory: $d"
done
}
find_mac()
{
start_mac=$1
for mac in $(ip link show | grep link/ether | (read _ mac _; echo $mac | tr : -)); do
if [ "${mac%??}" = "${start_mac%??}" ]; then
prefix=${mac%??}
suffix=$(printf %x $(( 0x${mac##*-} + 1 )))
MAC=${prefix}${suffix}
return
fi
done
MAC=$start_mac
}
boot_vm()
{
boot_drive=$1
installer_target=samizdat.disk.img
if [ ! -e "$installer_target" ]
then
fallocate -l 10G "$installer_target"
fi
find_mac 52-54-00-12-34-56
qemu-system-x86_64 \
-enable-kvm \
-smp 2 \
-m 512 \
-k en-us \
-net nic,model=virtio,macaddr=$MAC \
-vga qxl \
-drive file="$boot_drive",format=raw \
-drive file="$installer_target",format=raw
}
. samizdat-paths.sh || die 'samizdat-paths.sh not found'
samizdat_linux_dir=/boot
: ${GPG_INPUT_DIR:=/cdrom/gnupghome}
: ${GRUB_CONFIG:=conf/grub.cfg}
start_keys=64 # megs
end_keys=256 # megs
if [ "$KERNEL_VERSION" ]
then
version_suffix=-$KERNEL_VERSION
fi
sanity_checks
set -e
if [ "$1" ]
then
[ -b "$1" ] || die "Not a block device: $1"
target=$1
globalize
individualize
release_target_block_devices
else
template=boot-disk.template.img
if [ ! -e "$template" ]
then
target="$template".tmp globalize
release_target_block_devices
mv -T "$template".tmp "$template"
fi
target=boot-disk.img.tmp
cp -T --reflink=always "$template" "$target"
acquire_target_block_devices
individualize
release_target_block_devices
final=${target%.tmp}
mv -T "$target" "$final"
target=$final
fi
boot_vm "$target"
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