partman-btrfs/finish.d/aptinstall_btrfs

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#!/bin/sh
. /lib/partman/lib/base.sh
btrfs=no
for dev in $DEVICES/*; do
[ -d "$dev" ] || continue
cd $dev
partitions=
open_dialog PARTITIONS
while { read_line num id size type fs path name; [ "$id" ]; }; do
[ "$fs" != free ] || continue
[ -f $id/method -a -f $id/acting_filesystem ] || continue
filesystem=$(cat $id/acting_filesystem)
case $filesystem in
btrfs)
btrfs=yes
;;
esac
done
close_dialog
done
if [ "$btrfs" = yes ]; then
apt-install btrfs-progs || true
fi