Vraag Hoe schakel ik Ubuntu in (met volledige schijfversleuteling) om LUKSsupend te bellen voordat ik slaap / ophanging naar RAM?

De oplossing die ik het meest kon vinden, is dit suspend.sh-script van het concept proof of concept van Mikko Rauhala.

#!/bin/sh

# A proof of concept script for forgetting LUKS passwords on suspend
# and reasking them on resume.

# The basic idea is to copy all of the files necessary for luksResume
# onto a RAM disk so that we can be sure they'll be available without
# touching the disk at all. Then switch to a text VT to run the resume
# (easier to make sure it'll come up than to do the same with X).

# The suspend itself has to be done from the ramdisk too to make sure it
# won't hang. This is also a reason why this couldn't be reliably done as a
# self-contained /etc/pm/sleep.d script, so to make the concept clear
# (and because I'm lazy) I did just a minimal standalone proof of concept
# instead. Integrating the functionality into the usual pm tools would be
# encouraged. (Though suspend_pmu would apparently need perl on the ramdisk...)

# (C) 2013 Mikko Rauhala 2013, modifiable and distributable under
# CC0, GPLv2 or later, MIT X11 license or 2-clause BSD. Regardless
# of what you pick, there is NO WARRANTY of any kind.

RAMDEV=/dev/ram0
ROOT=/run/cryptosuspend

PATH=/sbin:/bin:/usr/sbin:/usr/bin

# Cleanup not strictly necessary every time but good for development.
# Doing it before rather than after a suspend for debugging purposes

for a in "$ROOT"/dev/pts "$ROOT"/proc "$ROOT"/sys "$ROOT" ; do
    umount "$a" > /dev/null 2>&1
done

if mount | grep -q "$ROOT" ; then
    echo "Cleanup unsuccessful, cryptosuspend root premounted." 1>&2
    exit 2
fi

if grep -q mem /sys/power/state; then
    METHOD=mem
elif grep -q standby /sys/power/state; then
    METHOD=standby
else
    echo "No mem or standby states available, aborting" 1>&2
    exit 1
fi

if ! mount | grep -q "$RAMDEV" ; then
    mkfs -t ext2 -q "$RAMDEV" 8192
    mkdir -p "$ROOT"
    mount "$RAMDEV" "$ROOT"
    mkdir "$ROOT"/sbin "$ROOT"/bin "$ROOT"/dev "$ROOT"/tmp "$ROOT"/proc "$ROOT"/sys
    cp "$(which cryptsetup)" "$ROOT"/sbin
    for a in $(ldd "$(which cryptsetup)" | grep "/" | cut -d / -f 2- | cut -d " " -f 1) ; do
        mkdir -p "$ROOT""$(dirname /$a)"
        cp "/$a" "$ROOT"/"$a"
    done
    cp "$(which busybox)" "$ROOT"/bin/
    ln -s busybox "$ROOT"/bin/sh
    ln -s busybox "$ROOT"/bin/sync
    cp -a /dev "$ROOT"
    mount -t proc proc "$ROOT"/proc
    mount -t sysfs sysfs "$ROOT"/sys
    mount -t devpts devpts "$ROOT"/dev/pts
fi

CRYPTDEVS="$(dmsetup --target crypt status | cut -d : -f 1)"

echo '#!/bin/sh' > "$ROOT"/bin/cryptosuspend
echo "sync" >> "$ROOT"/bin/cryptosuspend
echo "for a in $CRYPTDEVS ; do" >> "$ROOT"/bin/cryptosuspend
echo "  cryptsetup luksSuspend \$a" >> "$ROOT"/bin/cryptosuspend
echo "done" >> "$ROOT"/bin/cryptosuspend
echo "echo -n \"$METHOD\" > /sys/power/state" >> "$ROOT"/bin/cryptosuspend
echo "for a in $CRYPTDEVS ; do" >> "$ROOT"/bin/cryptosuspend
echo '  while ! cryptsetup luksResume'" \$a ; do" >> "$ROOT"/bin/cryptosuspend
echo "    true" >> "$ROOT"/bin/cryptosuspend
echo "  done" >> "$ROOT"/bin/cryptosuspend
echo "done" >> "$ROOT"/bin/cryptosuspend
chmod a+rx "$ROOT"/bin/cryptosuspend

sync
exec openvt -s chroot "$ROOT" /bin/cryptosuspend

Er is wat werk verzet om dit naar Ubuntu 14.04 te porteren hier. Dit is geen perfecte oplossing, omdat er nog steeds enkele zijn open problemen en het lijkt erop dat er geen werk is vrijgegeven sinds 11 juni 2014. Het lijkt echter een goed startpunt voor toekomstige ontwikkeling.

Bron:https://github.com/jonasmalacofilho/ubuntu-luks-suspend