This file is indexed.

/bin/partman-command 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.

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#! /bin/sh
# This script is intended for developer debugging purposes only. If you use
# it for anything else, on your own head be it ...

export DEBIAN_FRONTEND=noninteractive

. /lib/partman/lib/base.sh

if [ "${1#/dev/}" != "$1" ]; then
	dirname="$(echo "$1" | sed 's:/:=:g')"
	cd "$DEVICES/$dirname" || exit $?
	shift
else
	dir="$(pwd)"
	case $dir in
	    $DEVICES/*)
		;;
	    *)
		echo "Must be run from a subdirectory of $DEVICES" >&2
		exit 1
	esac
fi

# Within each group, please keep commands in the same order as in
# parted_server.c:main_loop().
case $1 in
    OPEN|OPENED|VIRTUAL|IS_CHANGED|PARTITION_INFO|GET_CHS|USES_NAMES|GET_MAX_PRIMARY|USES_EXTENDED|GET_FILE_SYSTEM|NEW_PARTITION|RESIZE_PARTITION|GET_RESIZE_RANGE|VIRTUAL_RESIZE_PARTITION|GET_VIRTUAL_RESIZE_RANGE|GET_LABEL_TYPE|IS_BUSY|ALIGNMENT_OFFSET)
	mode=line
	;;
    PARTITIONS|LABEL_TYPES|VALID_FLAGS|GET_FLAGS|FILE_SYSTEM_TYPES)
	mode=paragraph
	;;
    CLOSE|DISK_UNCHANGED|DUMP|COMMIT|UNDO|SET_FLAGS|SET_NAME|CHANGE_FILE_SYSTEM|NEW_LABEL|DELETE_PARTITION)
	mode=silent
	;;
    *)
	echo "Unrecognised command: $1" >&2
	exit 1
	;;
esac

open_dialog "$@"
case $mode in
    line)
	read_line response
	echo "$response"
	;;
    paragraph)
	read_paragraph
	;;
esac
close_dialog

exit 0