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