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#!/bin/sh
# usage:
# $0 boot-ram - use memory-only overlay
# $0 boot-new [dev name] [loop file] [megabytes] - create new luks-encrypted overlay
# $0 boot-overwrite [dev name] [loop file] [megabytes] - overwrite with new luks overlay
# $0 boot-luks [dev name] [loop file] - boot existing luks-encrypted overlay
# $0 boot-gpg [key id] [gnupg homedir] [???] - boot any device signed with the key
. btrfs-create.sh
. common.sh
exec 4>&1
debug_log
error()
{
local sleep=3
clear >&4
echo "error -- ${*:-:(}" >&4
if [ $sleep -gt 0 ]; then
echo "will try again in $sleep seconds..." >&4
sleep $sleep
fi
bootmenu do_trigger no_panic
exit
}
badopts=
fs=
while [ $# -ge 1 ]; do
case $1 in
--fs=*) fs="${1#--fs=}"; shift; continue ;;
--*) echo "error: unknown option $1"; badopts=true; shift; continue ;;
esac
break
done
[ -z "$badopts" ] || error 'usage error'
[ $# -ge 2 -o "$1" = 'boot-ram' ] || error 'usage error'
remountrw()
{
local fs="$1" dev="$2" loopfile="$3"
if [ "$fs" = hfsplus ]; then
mountpoint="/mnt/${dev##*/}"
umount "$dev" || error
fsck.hfsplus -q "$dev" || error
mount -o force "$dev" "$mountpoint" || error
else
mount -o remount,rw "$dev" || error
fi
}
hwclock_to_system()
{
local fs="$1" UTC=UTC
case "$fs" in ntfs|vfat) UTC=LOCAL ;; esac
printf '0.0 0 0.0\n0\n%s' $UTC > /etc/adjtime
hwclock --hctosys
}
case "$1" in
boot-ram)
read _ memtotal_kb _ < /proc/meminfo
# This doesn't make sense to me, but setting rd_size _lower_ than total
# memory seems to be what breaks things ('btrfs device add' hangs forever).
# Somehow you can fill up the filesystem and there's still space for
# programs and btrfs does not complain. I don't know what is going on here.
# BTW, I verified with blockdev that the device size really is being
# specified in KB here. I did not really believe it.
modprobe brd rd_nr=1 rd_size=$memtotal_kb
init_gpg || error
init_samizdat /dev/ram0 '' || {
umount /root/cdrom
umount /root/outerfs
umount /root
error
}
;;
boot-overwrite|boot-new|boot-luks)
dev="$2"
loopfile="$3"
megs="$4"
[ "$1" != 'boot-new' -o ! -e "$loopfile" ] || error
remountrw "$fs" "$dev" "$loopfile" || error
hwclock_to_system "$fs"
if [ "$1" = 'boot-overwrite' ]; then
rm "$loopfile" "$loopfile"k
fi
init_gpg || error
if [ "$1" = 'boot-luks' ]; then
open_samizdat "$loopfile" "$loopfile"k || error
exit
fi
start_meter "Allocating ${megs}MB in '$loopfile' on $dev..."
if init_samizdat_blockdev "$loopfile" "$megs" "$loopfile"k &&
init_samizdat /dev/mapper/samizdatcrypt "$loopfile"; then
stop_meter done.
else
stop_meter error!
rm "$loopfile" "$loopfile"k
dmsetup remove samizdatcrypt
# TODO: more teardown
error
fi
;;
*)
error "Unimplemented boot command: $*"
;;
esac
# vim:ts=2 sw=2 et
|
