/lib/partman/update.d/21lvm_sync_flag 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.
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 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 | #!/bin/sh
# This script removes the lvm flag for partitions whose method is not
# lvm and sets it for partition whose method is lvm
. /lib/partman/lib/base.sh
dev=$1
num=$2
id=$3
size=$4
type=$5
fs=$6
path=$7
cd $dev
if [ $fs = free ]; then
exit 0
fi
method=
if [ -f $id/method ]; then
method=$(cat $id/method)
fi
# Don't fiddle with label on devices where there is no "real" partitioning
open_dialog GET_LABEL_TYPE
read_line label
close_dialog
if [ "$label" = loop ]; then
exit 0
fi
has_lvm=no
flags=''
open_dialog GET_FLAGS $id
while { read_line flag; [ "$flag" ]; }; do
if [ "$flag" != lvm ]; then
flags="${flags:+$flags$NL}$flag"
else
has_lvm=yes
fi
done
close_dialog
# Some flags make no sense in combination with lvm
cleanflags=''
for flag in $flags; do
if [ "$flag" = raid ]; then
continue
elif [ "$flag" = swap ]; then
continue
else
cleanflags="${cleanflags:+$cleanflags$NL}$flag"
fi
done
if [ -z "$method" ] && [ "$has_lvm" = yes ]; then
echo lvm >$dev/$id/method
rm -f $dev/$id/use_filesystem
rm -f $dev/$id/format
elif [ "$method" = lvm ] && [ "$has_lvm" = no ]; then
open_dialog SET_FLAGS $id
write_line "$cleanflags"
write_line lvm
write_line NO_MORE
close_dialog
elif [ "$method" != lvm ] && [ "$has_lvm" = yes ]; then
open_dialog SET_FLAGS $id
write_line "$flags"
write_line NO_MORE
close_dialog
fi
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