scripts/debian/part.btrfs.sh

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#!/bin/sh
# For Debian install in late_command or in a TTY during installation.
# Complete the Btrfs partitionning
#
# Source: https://wiki.101010.fr/doku.php?id=debian:installation_btrfs
# Remount the partition with "compress" option
mount -o remount,defaults,compress=lzo /target
# Manage subvolumes creation
for DIR in etc home opt root srv tmp usr var; do
## Move existent directory to a temp directory
test -d "/target/${DIR}" && mv -- /target/"${DIR}" /target/"${DIR}".temp
## Create subvolume
btrfs subvolume create /target/"${DIR}"
## If the directory already existed
if [ -d "/target/${DIR}.temp" ]; then
## Move the content to the new subvolume
mv -- /target/"${DIR}".temp/.* /target/"${DIR}".temp/* /target/"${DIR}"
## Remove the temp directory
rmdir -- /target/"${DIR}".temp
fi
done
# Ensure everything is ok
btrfs subvolume list -p /target
exit 0