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#!/bin/bash
# Mount home as an overlay filesystem
# Log stdout & stderr
exec > >(tee -i /tmp/gdm3_postlogin.log)
exec 2>&1
# Treat unset variables as an error when substituting.
set -u
# Exit immediately if a command exits with a non-zero status.
set -e
# Separate tokens on newlines only
IFS='
'
# The value of this parameter is expanded like PS1 and the expanded value is the
# prompt printed before the command line is echoed when the -x option is set
# (see The Set Builtin). The first character of the expanded value is replicated
# multiple times, as necessary, to indicate multiple levels of indirection.
# \D{%F %T} prints date like this : 2019-12-31 23:59:59
PS4='-\D{%F %T} '
# Print commands and their arguments as they are executed.
set -x
sleep 0.5
# Find the first removable F2FS partition
PART=$(lsblk -o tran,kname,hotplug,type,fstype -pr |
grep -e '1 part f2fs' -e '1 disk f2fs' |
cut -d' ' -f2 |
sort |
head -n1)
# Make sure the mountpoints are free
(
lsof -t $HOME | xargs kill -9
umount $HOME
umount /mnt
) || true
if test "$PART"
then
mount -o noatime "$PART" /mnt
else
# No removable F2FS partition found, use the third local partition instead
PART=$(lsblk -o tran,kname,hotplug,type,fstype -pr |
grep -v usb |
grep '0 part' |
cut -d' ' -f2 |
sort |
head -n3 |
tail -n1)
if test -z "$PART"
then
# No local partition found, error
exit 1
fi
# We don't care about data consistency since the partition is temporary
/sbin/mke2fs -t ext4 -O ^has_journal -F "$PART"
mount -o noatime,nobarrier "$PART" /mnt
fi
USER_PATH=/mnt/.01/$USER
TEMP_PATH=/mnt/.01/tmp
mkdir -p $USER_PATH $TEMP_PATH
mount -t overlay -o lowerdir=$HOME,upperdir=$USER_PATH,workdir=$TEMP_PATH overlay $HOME