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Filename : fixrtc-mount
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#!/bin/sh
# initramfs local-bottom script for fixrtc-mount

PREREQ=""

# Output pre-requisites
prereqs()
{
        echo "$PREREQ"
}

case "$1" in
    prereqs)
        prereqs
        exit 0
        ;;
esac

# This script looks at root file system files to get an accurate as possible
# date. It runs when we already have a mounted root, as opposed to the 'fixrtc'
# script, which uses the last mount time of the root file system. In devices
# where there is no battery for the RTC, 'fixrtc' is not effective, as the mount
# time will always be inaccurate. This script helps in those cases.

BROKEN_CLOCK=""

# shellcheck disable=SC2013
for opt in $(cat /proc/cmdline); do
        case ${opt} in
        fixrtc)
                BROKEN_CLOCK=1
        ;;
        esac
done

if [ -n "$BROKEN_CLOCK" ]; then
        snapsfolder=/root/writable/system-data/var/lib/snapd/snaps

        current=$(date +%s)

        # We start with date at the time of writing this
        newdate=$(date -d "2018-07-26" +%s)

        if [ -d "$snapsfolder" ]; then
                otherdate=$(stat -c %Y "$snapsfolder")
                if [ "$otherdate" -gt "$newdate" ]; then
                        newdate=$otherdate
                fi
        fi

        if [ "$newdate" -gt "$current" ]; then
                date -s "@$newdate"
                echo "initrd: date set from $0 ($(date --utc))" > /dev/kmsg
        fi
fi

# This script is best-effort.  If we couldn't fudge the clock as desired,
# just try to carry on boot anyway:
# Boot will probably fail, but we won't have made the situation any worse
exit 0