/lib/partman/active_partition/30format/do_option is in ubiquity 18.04.14.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 | #!/bin/sh
. /lib/partman/lib/base.sh
dev="$2"
id=$3
[ -f $dev/$id/method ] || exit 0
method=$(cat $dev/$id/method)
case "$method" in
keep)
echo format >$dev/$id/method
> $dev/$id/format
> $dev/$id/use_filesystem
;;
format)
echo keep >$dev/$id/method
rm -f $dev/$id/format
> $dev/$id/use_filesystem
;;
esac
update_partition $dev $id
|