/lib/partman/update.d/50filesystems is in ubiquity 2.18.7.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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. /lib/partman/lib/base.sh
dev=$1
num=$2
id=$3
size=$4
type=$5
fs=$6
path=$7
name=$8
cd $dev
mkdir -p $id
if [ $fs = free ]; then
rm -f $id/method
fi
if [ ! -f $id/method ] || [ ! -f $id/use_filesystem ]; then
rm -f $id/acting_filesystem
exit 0
fi
if [ -f $id/filesystem ]; then
cp $id/filesystem $id/acting_filesystem
else
rm -f $id/acting_filesystem
fi
open_dialog PARTITION_INFO $id
read_line num id size type fs path name
close_dialog
acting_filesystem=''
if [ -f $id/acting_filesystem ] && \
acting_filesystem=$(cat $id/acting_filesystem) && \
[ -f /lib/partman/parted_names/$acting_filesystem ] && \
new_fs=$(cat /lib/partman/parted_names/$acting_filesystem) && \
[ "$fs" != "$new_fs" ]; then
open_dialog CHANGE_FILE_SYSTEM $id $new_fs
close_dialog
fi
existing=no
formatable=no
for i in /lib/partman/valid_filesystems/*; do
[ -x $i ] || continue
if [ "$($i $dev $id existing)" = "$acting_filesystem" ]; then
existing=yes
fi
if [ "$($i $dev $id formatable)" = "$acting_filesystem" ]; then
formatable=yes
fi
done
if [ $existing = yes ]; then
> $dev/$id/existing
else
rm -f $dev/$id/existing
fi
if [ $formatable = yes ]; then
> $dev/$id/formatable
else
rm -f $dev/$id/formatable
fi
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