| Current File : //proc/thread-self/root/usr/share/initramfs-tools/scripts/local-premount/fixrtc |
#!/bin/sh -e
# initramfs local-premount script for fixrtc
PREREQ=""
# Output pre-requisites
prereqs()
{
echo "$PREREQ"
}
case "$1" in
prereqs)
prereqs
exit 0
;;
esac
# use the fixrtc cmdline option in your bootloader to
# automatically set the hardware clock to the date of
# the last mount of your root filesystem to avoid fsck
# to get confused by the superblock being in the future
BROKEN_CLOCK=""
ROOTDEV=""
# System partition is currently used by ubuntu touch only
SYSTEMPART=""
# shellcheck disable=SC2013
for x in $(cat /proc/cmdline); do
case ${x} in
root=*)
value=${x#*=}
# Find the device node path depending on the form of root= :
case ${value} in
UUID=*)
ROOTDEV=/dev/disk/by-uuid/${value#UUID=}
;;
LABEL=*)
ROOTDEV=/dev/disk/by-label/${value#LABEL=}
;;
*)
ROOTDEV=${value}
;;
esac
;;
systempart=*)
value=${x#*=}
# Find the device node path depending on the form of root= :
case ${value} in
UUID=*)
SYSTEMPART=/dev/disk/by-uuid/${value#UUID=}
;;
LABEL=*)
SYSTEMPART=/dev/disk/by-label/${value#LABEL=}
;;
*)
SYSTEMPART=${value}
;;
esac
# if systempart= is defined we do not want root=/dev/ram
# been taken into account
[ "$ROOTDEV" = "/dev/ram" ] && ROOTDEV=""
;;
fixrtc)
BROKEN_CLOCK=1
;;
esac
done
# Touch devices might not have a valid 'root', so use system part if available
if [ -z "$ROOTDEV" ] && [ -n "$SYSTEMPART" ]; then
ROOTDEV=$SYSTEMPART
fi
if [ -n "$BROKEN_CLOCK" ] && [ -n "$ROOTDEV" ]; then
# need udev settle for /dev/disk/by-* symlinks to be added
udevadm settle
wait-for-root "$ROOTDEV" "${ROOTDELAY:-180}" >/dev/null
ROOTDISK=$(readlink -f "$ROOTDEV")
MOUNTDATESTR=$(dumpe2fs -h "$ROOTDISK" 2>/dev/null|grep "Last mount time")
# Trim whitespace for busybox
MOUNTDATE="${MOUNTDATESTR#*:}"
MOUNTDATE="${MOUNTDATE#"${MOUNTDATE%%[![:space:]]*}"}"
CREATEDATESTR=$(dumpe2fs -h "$ROOTDISK" 2>/dev/null|grep "Filesystem created") || true
# Trim whitespace for busybox
CREATEDATE="${CREATEDATESTR#*:}"
CREATEDATE="${CREATEDATE#"${CREATEDATE%%[![:space:]]*}"}"
# Hide stderr to avoid ugly message:
# can't open '/dev/misc/rtc': No such file or directory
# on pi2 (and possible more PIs) where there is no /dev/rtc of
# any kind. We still need to keep this call because we use
# fixrtc on all armhf images.
hwclock -s 2>/dev/null || true
# make sure we're also compatible with busybox, if available
DATE="/bin/date -D%c"
date -D%c 2>/dev/null 2>&1 || DATE=/bin/date
if [ "$MOUNTDATE" = "n/a" ]; then
# some versions of mkfs set n/a now, date is not happy with this so
# let us use some half way sane epoch instead
MOUNTDATE="Fri Jan 1 00:00:00 1999"
fi
TIMESTR=$MOUNTDATE
TIME=$(${DATE} --utc --date "${TIMESTR}" +%s)
CURTIME=$(${DATE} --utc +%s)
# in case the created time is newer than last mount, use that instead
if [ -n "$CREATEDATE" ]; then
CREATETIME=$(${DATE} --utc --date "${CREATEDATE}" +%s)
if [ "$CREATETIME" -gt "$TIME" ]; then
TIMESTR=$CREATEDATE
TIME=$CREATETIME
fi
fi
if [ "$TIME" -gt "$CURTIME" ]; then
${DATE} --set="${TIMESTR} 1 minute" >/dev/null 2>&1
fi
fi
# This script is best-effort. If we couldn't fudge the clock as desired,
# just try to carry on boot anyway:
# It will probably fail, but we won't have made the situation any worse.
exit 0