This file is indexed.

/lib/systemd/system-generators/postgresql-generator is in postgresql-common 181+deb9u1.

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 systemd generator creates dependency symlinks that make all PostgreSQL
# clusters with "auto" in their start.conf file be started/stopped/reloaded
# when postgresql.service is started/stopped/reloaded.

set -eu

gendir="$1"
wantdir="$1/postgresql.service.wants"
pgservice="/lib/systemd/system/postgresql@.service"

mkdir -p "$wantdir"

for conf in /etc/postgresql/*/*/postgresql.conf; do
	test -e "$conf" || continue
	dir="${conf%/*}"

	# evaluate start.conf
	if [ -e "$dir/start.conf" ]; then
		start=$(sed 's/#.*$//; /^[[:space:]]*$/d; s/^\s*//; s/\s*$//' "$dir/start.conf")
	else
		start=auto
	fi
	[ "$start" = "auto" ] || continue

	verdir="${dir%/*}"
	version="${verdir##*/}"
	cluster="${dir##*/}"
	ln -s "$pgservice" "$wantdir/postgresql@$version-$cluster.service"
done

exit 0