/lib/partman/check.d/07basic_method_only 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 25 26 27 28 29 30 31 32 33 | #!/bin/sh
. /lib/partman/lib/base.sh
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
[ "$fs" != free ] || continue
partitions="$partitions $id,$num"
done
close_dialog
for part in $partitions; do
id=${part%,*}
num=${part#*,}
[ -f $id/method ] || continue
method=$(cat $id/method)
[ "$method" = format -o "$method" = keep ] || continue
[ ! -f $id/acting_filesystem ] || continue
db_subst partman-basicmethods/method_only PARTITION "$num"
db_subst partman-basicmethods/method_only DEVICE $(humandev $(cat device))
db_input critical partman-basicmethods/method_only || true
db_go || exit 1
db_get partman-basicmethods/method_only
if [ "$RET" = true ]; then
exit 1
fi
done
done
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