/lib/partman/commit.d/45format_swap 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
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 -a -f $id/format ] || continue
method=$(cat $id/method)
if [ "$method" = swap ]; then
if [ -f $id/formatted ] && \
[ $id/formatted -nt $id/method ]; then
continue
fi
log "Try to format swap space in $dev/$id"
disable_swap "$dev" "$id" || true
template=partman-basicfilesystems/progress_swap_formatting
open_dialog PARTITION_INFO $id
read_line x1 x2 x3 x4 x5 device x6
close_dialog
rm -f $id/old_uuid
if [ -f $id/detected_filesystem ]; then
old_fs=$(cat $id/detected_filesystem)
if [ "$old_fs" = linux-swap ]; then
# Save the old UUID so that we can restore it later.
dd if=$device of=$id/old_uuid bs=1 skip=1036 count=16 2>/dev/null || true
fi
fi
db_subst $template PARTITION "$num"
db_subst $template DEVICE $(humandev $(cat device))
name_progress_bar $template
db_progress START 0 3 partman/text/formatting
db_progress INFO $template
db_progress SET 1
# According to Szabolcs Szakacsits, the NTFS-3g author, it is
# safer to format the loop file, rather than the device.
[ ! -s loop ] || device="$(cat loop)"
if log-output -t partman --pass-stdout \
mkswap $device >/dev/null; then
sync
status=OK
else
status=failed
fi
db_progress STOP
if [ "$status" != OK ]; then
db_subst partman-basicfilesystems/create_swap_failed TYPE linux-swap
db_subst partman-basicfilesystems/create_swap_failed PARTITION "$num"
db_subst partman-basicfilesystems/create_swap_failed DEVICE $(humandev $(cat device))
db_input critical partman-basicfilesystems/create_swap_failed || true
db_go || true
exit 1
fi
if [ -s "$id/old_uuid" ]; then
# Restore the old UUID so that systems using UUIDs in
# /etc/fstab don't unexpectedly end up without swap.
dd if=$id/old_uuid of=$device bs=1 seek=1036 count=16 conv=notrunc 2>/dev/null || true
fi
rm -f $id/old_uuid
>$id/formatted
fi
done
done
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