From 1f0f8ee4511342957dfeefb1914afa86de0ce1cb Mon Sep 17 00:00:00 2001
From: Disassembler <disassembler@dasm.cz>
Date: Wed, 20 Sep 2017 11:35:13 +0200
Subject: [PATCH] Add possibility to enable PostgreSQL query logging

---
 01-basic.sh                                   | 8 ++++++++
 basic/etc/postgresql/9.6/main/postgresql.conf | 6 +++---
 2 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/01-basic.sh b/01-basic.sh
index 4b4923a..d0ffeb6 100755
--- a/01-basic.sh
+++ b/01-basic.sh
@@ -122,5 +122,13 @@ apt-get -y --no-install-recommends -y install postgresql-9.6 postgresql-9.6-post
 cp ${SOURCE_DIR}/basic/etc/postgresql/9.6/main/postgresql.conf /etc/postgresql/9.6/main/postgresql.conf
 cp ${SOURCE_DIR}/basic/etc/postgresql/9.6/main/pg_hba.conf /etc/postgresql/9.6/main/pg_hba.conf
 
+# Enable query logging. Only if the DEBUG environment variable exists
+if [ -n "${DEBUG}" ]; then
+    sed -i 's/#log_destination/log_destination/' /etc/postgresql/9.6/main/postgresql.conf
+    sed -i 's/#logging_collector/logging_collector/' /etc/postgresql/9.6/main/postgresql.conf
+    sed -i 's/#log_directory/log_directory/' /etc/postgresql/9.6/main/postgresql.conf
+    sed -i 's/#log_statement/log_statement/' /etc/postgresql/9.6/main/postgresql.conf
+fi
+
 # Restart
 systemctl restart postgresql
diff --git a/basic/etc/postgresql/9.6/main/postgresql.conf b/basic/etc/postgresql/9.6/main/postgresql.conf
index 1425edb..23ddd77 100644
--- a/basic/etc/postgresql/9.6/main/postgresql.conf
+++ b/basic/etc/postgresql/9.6/main/postgresql.conf
@@ -334,13 +334,13 @@ effective_cache_size = 1GB
 					# requires logging_collector to be on.
 
 # This is used when logging to stderr:
-#logging_collector = off		# Enable capturing of stderr and csvlog
+#logging_collector = on			# Enable capturing of stderr and csvlog
 					# into log files. Required to be on for
 					# csvlogs.
 					# (change requires restart)
 
 # These are only used if logging_collector is on:
-#log_directory = 'pg_log'		# directory where log files are written,
+#log_directory = '/var/log/postgresql'	# directory where log files are written,
 					# can be absolute or relative to PGDATA
 #log_filename = 'postgresql-%Y-%m-%d_%H%M%S.log'	# log file name pattern,
 					# can include strftime() escapes
@@ -450,7 +450,7 @@ log_line_prefix = '%m [%p] %q%u@%d '			# special values:
 					#   %% = '%'
 					# e.g. '<%u%%%d> '
 #log_lock_waits = off			# log lock waits >= deadlock_timeout
-#log_statement = 'none'			# none, ddl, mod, all
+#log_statement = 'all'			# none, ddl, mod, all
 #log_replication_commands = off
 #log_temp_files = -1			# log temporary files equal or larger
 					# than the specified size in kilobytes;