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#!/bin/sh
: ${ROOT_MKFS_CMD:=mkfs.ext4 -q}
: ${ROOT_FS_TYPE:=ext4}
losetup() { /sbin/losetup "$@"; }
luks_secret()
{
local parms=$-; # this junk keeps set -x from being too annoying
set +x
[ -n "$luks_secret" ] || luks_secret="$(head -c256 /dev/urandom)"
printf %s "$luks_secret"
case $parms in *x*) set -x; set -x ;; esac
}
floor4()
{
# Negatives round up, but aren't used.
echo $(($1 / 4 * 4))
}
ceil4()
{
local x="$1"
[ $((x % 4)) -eq 0 ] || x=$((x + 4 - x % 4))
printf '%d\n' "$x"
}
init_samizdat()
{
local imgfile="$1" megs="$2" keyfile="$3" dev
init_samizdat_blockdev "$imgfile" "$megs" "$keyfile" || return
local blockdev=/dev/mapper/samizdatcrypt
mount -t btrfs -o subvol=ROOT /cdrom/live/filesystem.btrfs /root || return
btrfs device add "$blockdev" /root || return
mount -o rw,remount /root || return
btrfs subvolume create /root/gpg || return
# TODO: Restart gpg agent with stored credentials.
# TODO: Actually, if we unconditionally added a ramdisk, we could go
# ahead with the boot, and then do this whole thing from the installed
# system (after pivot_root). That way, there would be no need to
# restart.
# Really, the option to install could be identical to the option to
# boot from RAM except that it would record the intent to install; or
# else it could be removed entirely, with an option to persist added
# as some kind of UI element.
mv /gpg/gnupghome /root/gpg/ || return
bootdone root-mounted
}
open_samizdat()
{
open_samizdat_blockdev "$@" || return
local blockdev=/dev/mapper/samizdatcrypt
losetup -f /cdrom/live/filesystem.btrfs || return
modprobe btrfs || return
btrfs device scan || return
mount -t btrfs -o subvol=ROOT "$blockdev" /root || return
bootdone root-mounted
}
init_samizdat_lodev()
{
local imgfile="$1" megs=$(ceil4 "$2")
truncate -s ${megs}M "$imgfile" || return
dev=$(losetup -f) && losetup "$dev" "$imgfile" || return
echo "$dev"
}
open_samizdat_blockdev()
{
local imgfile="$1" keyfile="$2" dev
local cryptname=samizdatcrypt
dev=$(losetup -f) && losetup "$dev" "$imgfile" || return
gpg2 --verify "$keyfile" || return
# The first --decrypt merely strips the signature. The option is
# poorly named for that case.
gpg2 --decrypt "$keyfile" | gpg2 --decrypt | cryptsetup --key-file - luksOpen "$dev" "$cryptname" || return
[ -b /dev/mapper/"$cryptname" ] || return
}
init_samizdat_blockdev()
{
local imgfile="$1" megs="$2" keyfile="$3" dev
local cryptname=samizdatcrypt
dev=$(init_samizdat_lodev "$imgfile" "$megs") || return
[ ! -b /dev/mapper/"$cryptname" ] || return
luks_secret >/dev/null
luks_secret | gpg2 --default-recipient-self --encrypt --armor | gpg2 --clearsign --output "$keyfile" || return
luks_secret | cryptsetup luksFormat "$dev" - || return
cryptsetup luksDump "$dev" >&2
luks_secret | cryptsetup --key-file - luksOpen "$dev" "$cryptname" || return
[ -b /dev/mapper/"$cryptname" ] || return
}
majmin()
{
local dev="$1" major minor
eval $(stat -c 'major=%t minor=%T' "$dev") || return
[ "$major" -a "$minor" ] || return
printf '%d:%d\n' 0x$major 0x$minor
}
cryptdev_to_dev()
{
local dev="$1" majmin
majmin=$(majmin "$dev") || return
set -- /sys/dev/block/$majmin/slaves/*
[ $# = 1 ] || return
cryptsetup status "$dev" |while read k v; do if [ "$k" = device: ]; then echo $v; break; fi; done
}
cryptdev_to_backing_file()
{
local dev="$1" majmin result
majmin="$(majmin "$dev")" || return
set -- /sys/dev/block/$majmin/slaves/*
[ $# = 1 ] || return
read result < "$1"/loop/backing_file || return
printf '%s\n' "$result"
}
lodev_to_file()
{
local result majmin dev="$1"
majmin="$(majmin "$dev")" || return
read result < /sys/dev/block/$majmin/loop/backing_file || return
printf '%s' "$result"
}
mountpoint_to_dev()
{
local wantmp="$1" dev mp rest
mountpoint -q "$wantmp" || return
while read dev mp rest; do if [ "$mp" = "$wantmp" ]; then echo "$dev"; return; fi; done < /proc/mounts
return 1
}
get_cdrom_sizelimit()
{
# returns bytes
local dev="$1" sectors
sectors=$(blockdev --getsz "$dev") || return
if dd count=2 if="$dev" bs=2048 skip=$((sectors/4 - 2)) of=/dev/null 2>/dev/null; then
return
else
echo $(((sectors-8)*512))
fi
}
init_gpg()
{
bootwait samizdat-cdrom
export GNUPGHOME=/gpg/gnupghome
(umask 077; rsync --exclude '/luks-key*' --ignore-existing -rpP /cdrom/samizdat/gpg/ /gpg/)
if samizdat-password-agent >/var/log/samizdat-password-agent.log 2>&1; then
clear
true
else
false
fi
}
start_meter()
{
local startmsg="$*"
(exec >&4
clear
echo -n $startmsg
set +x
while sleep 2; do
echo -n .
done) &
meterpid=$!
}
stop_meter()
{
local endmsg="$*"
kill $meterpid
echo " $endmsg" >&4
}
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