Backport from branch: 9.6-2.4

Fix default datadir

- Change into default datadir
- Add small unittest

.travis.yml

@@ -0,0 +1,27 @@
+sudo: required
+
+language: python
+
+services:
+  - docker
+
+virtualenv:
+  system_site_packages: true
+
+python:
+  - '2.7'
+
+script:
+  - ./build.sh
+  - pushd sample/replication
+  - make up
+  - make status
+  # Check for database status
+  - until make check-master-running; do echo "Retrying"; sleep 5; done
+  - until make check-slave-running; do echo "Retrying"; sleep 5; done
+
+  # Check replications
+  - until make check-master-replication; do echo "Retrying"; make master-log-tail; sleep 5; done
+  - sleep 60  # Wait replication finished
+  - until make check-slave-replication; do echo "Retrying"; make slave-log-tail; sleep 5; done
+  - popd

sample/replication/Makefile

@@ -24,3 +24,27 @@ master-log:
 
 slave-log:
 	docker-compose logs -f --tail=30 pg-slave
+
+
+# These commands were used for travis
+
+master-log-tail	:
+	docker-compose logs --tail=30 pg-master
+
+slave-log-tail:
+	docker-compose logs --tail=30 pg-slave
+
+check-master-running:
+	@echo "Check master is running"
+	@docker-compose logs --tail=1 pg-master | grep 'database system is ready to accept connections' &> /dev/null
+
+check-master-replication:
+	@docker-compose exec pg-master /bin/sh -c "su - postgres -c \"/tests/replication_test_master.sh\""
+
+check-slave-running:
+	@echo "Check slave is running"
+	@docker-compose logs pg-slave | grep 'database system is ready to accept read only connections' &> /dev/null
+	@docker-compose logs pg-slave | grep 'started streaming WAL from primary' &> /dev/null
+
+check-slave-replication:
+	@docker-compose exec pg-slave /bin/sh -c "su - postgres -c \"/tests/replication_test_slave.sh\""

sample/replication/docker-compose.yml

@@ -9,6 +9,7 @@ services:
     # observe how the slave will behave after restarts.
     volumes:
       - './pg-master:/var/lib/postgresql'
+      - './tests:/tests'
     environment:
       # ALLOW_IP_RANGE option is used to specify additionals allowed domains
       # in pg_hba.
@@ -31,6 +32,7 @@ services:
     # runtime
     volumes:
       - './pg-slave:/var/lib/postgresql'
+      - './tests:/tests'
     environment:
       # ALLOW_IP_RANGE option is used to specify additionals allowed domains
       # in pg_hba.

sample/replication/tests/replication_test_master.sh

@@ -0,0 +1,19 @@
+#!/bin/sh
+
+. /env-data.sh
+
+set -e
+
+echo "Check master replication"
+
+# Create a new table
+
+echo "Create new table"
+psql -d ${POSTGRES_DBNAME} -c "CREATE TABLE test_replication_table ();"
+
+# Check table exists in master
+
+echo "Check table exists"
+psql -d ${POSTGRES_DBNAME} -c "\dt" | grep test_replication_table
+
+exit $?

sample/replication/tests/replication_test_slave.sh

@@ -0,0 +1,14 @@
+#!/bin/sh
+
+. /env-data.sh
+
+set -e
+
+echo "Check slave replication"
+
+# Check table exists in slave
+
+echo "Check table exists"
+psql -d ${POSTGRES_DBNAME} -c "\dt" | grep test_replication_table
+
+exit $?

setup-replication.sh

@@ -25,6 +25,7 @@ done
 if [[ "$DESTROY_DATABASE_ON_RESTART" =~ [Tt][Rr][Uu][Ee] ]]; then
 	echo "Get initial database from master"
 
+	chown -R postgres:postgres $(getent passwd postgres  | cut -d: -f6)
 	su - postgres -c "echo \"${REPLICATE_FROM}:${REPLICATE_PORT}:*:${POSTGRES_USER}:${POSTGRES_PASS}\" > ~/.pgpass"
 	su - postgres -c "chmod 0600 ~/.pgpass"
 
@@ -32,6 +33,10 @@ if [[ "$DESTROY_DATABASE_ON_RESTART" =~ [Tt][Rr][Uu][Ee] ]]; then
 	do
 		echo "Waiting for master to connect..."
 		sleep 1s
+		if [ "$(ls -A $DATADIR)" ]; then
+			echo "Need empty folder. Cleaning directory..."
+			rm -rf $DATADIR/*
+		fi
 	done
 fi