/lib/partman/update.d/21efi_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 | #!/bin/sh
# This script removes the efi flag for partitions whose method is not
# efi and sets it for partition whose method is efi
[ -e /var/lib/partman/efi ] || exit 0
. /lib/partman/lib/base.sh
dev=$1
num=$2
id=$3
size=$4
type=$5
fs=$6
path=$7
shift; shift; shift; shift; shift; shift; shift
name=$*
cd $dev
if [ $fs = free ]; then
exit 0
fi
method=
if [ -f $id/method ]; then
method=$(cat $id/method)
fi
flags=''
open_dialog GET_FLAGS $id
while { read_line flag; [ "$flag" ]; }; do
if [ "$flag" != boot ]; then
flags="${flags:+$flags$NL}$flag"
fi
done
close_dialog
open_dialog USES_NAMES
read_line uses_names
close_dialog
if [ "$method" = efi ] && [ ! -f $id/bootable ]; then
open_dialog SET_FLAGS $id
write_line "$flags"
write_line boot
write_line NO_MORE
close_dialog
>$id/bootable
>$id/efi_bootable
if [ "$uses_names" = yes ] && [ "$fs" = fat32 ]; then
open_dialog SET_NAME $id "EFI System Partition"
close_dialog
fi
RET=''
elif [ "$method" != efi ] && [ -f $id/bootable ] && \
[ -f $id/efi_bootable ]; then
open_dialog SET_FLAGS $id
write_line "$flags"
write_line NO_MORE
close_dialog
rm $id/bootable
rm $id/efi_bootable
if [ "$uses_names" = yes ] && [ "$fs" = fat32 ] && \
[ "$name" = "EFI System Partition" ]; then
open_dialog SET_NAME ""
close_dialog
fi
fi
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