Current File : //usr/share/initramfs-tools/hooks/resume
#!/bin/sh
PREREQ=""
prereqs()
{
echo "$PREREQ"
}
case $1 in
# get pre-requisites
prereqs)
prereqs
exit 0
;;
esac
. /usr/share/initramfs-tools/scripts/functions
# First check if a location is set and is a valid swap partition.
# If so, the config file will be copied in and there is nothing to do.
if [ -n "$RESUME" ] && [ "$RESUME" != auto ]; then
if [ "$RESUME" = none ]; then
exit 0
fi
if resume_dev_node="$(resolve_device "$RESUME")" && \
blkid -p -n swap "$resume_dev_node" >/dev/null 2>&1; then
exit 0
fi
echo >&2 "W: initramfs-tools configuration sets RESUME=$RESUME"
echo >&2 "W: but no matching swap device is available."
fi
# If we were not explicitly requested to select a device, or the -v
# option is used, report that we are doing so
report_auto()
{
test "${verbose?}" != y && test "$RESUME" = auto || echo "I: $*"
}
# Report in excruciating detail if the -v option is used
report_verbose()
{
test "${verbose?}" != y || echo "I: $*"
}
report_verbose "Configuration sets RESUME=$RESUME"
# Try to autodetect the RESUME partition, using biggest swap device that
# is not ephemeral. We need to be able to read the listed swap partitions.
resume_auto=
if ! ischroot && [ -r /proc/swaps ]; then
# shellcheck disable=SC2013
for resume_auto in $(grep ^/dev/ /proc/swaps | sort -rnk3 | cut -d " " -f 1); do
report_verbose "Checking swap device $resume_auto"
ephemeral=false
dm_name="$(dmsetup info -c --noheadings -o name "$resume_auto" 2>/dev/null)"
# dm-crypt is ephemeral if the key file is /dev/urandom
if [ -n "$dm_name" ] && [ -e /etc/crypttab ]; then
report_verbose "$resume_auto has device-mapper name $dm_name; checking crypttab"
# shellcheck disable=SC2034
while read -r cryptdev srcdev keyfile junk; do
report_verbose "Found cryptdev=$cryptdev keyfile=$keyfile"
if [ "$cryptdev" = "$dm_name" ] && [ "$keyfile" = /dev/urandom ]; then
report_verbose "Rejecting $resume_auto since it has no permanent key"
ephemeral=true
fi
done < /etc/crypttab
fi
# zram is ephemeral
case "$resume_auto" in
/dev/zram*)
report_verbose "Rejecting $resume_auto since it is zram"
ephemeral=true
;;
/dev/zd[0-9]*)
report_verbose "Rejecting $resume_auto since it is zvol"
ephemeral=true
;;
esac
$ephemeral || break
done
if $ephemeral; then
resume_auto=
fi
if [ -n "$resume_auto" ]; then
if [ -n "$dm_name" ]; then
resume_auto_canon="/dev/mapper/$dm_name"
elif UUID=$(blkid -s UUID -o value "$resume_auto"); then
resume_auto_canon="UUID=$UUID"
else
resume_auto_canon=
fi
report_auto "The initramfs will attempt to resume from $resume_auto"
if [ -n "$resume_auto_canon" ]; then
report_auto "($resume_auto_canon)"
resume_auto="$resume_auto_canon"
fi
report_auto "Set the RESUME variable to override this."
fi
fi
# Write selected resume device to intramfs conf.d
if [ "$RESUME" = auto ] || [ -n "$resume_auto" ]; then
# If we were explicitly requested to select a device, and we failed,
# report that
if [ -z "$resume_auto" ]; then
echo >&2 "W: initramfs-tools failed to select a resume device"
fi
echo "RESUME=${resume_auto}" > "${DESTDIR}/conf/conf.d/zz-resume-auto"
fi
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