From 3231f4a4d8d298e038b3ca309228713150a70f28 Mon Sep 17 00:00:00 2001
From: Victor Heng <bakavic@gmail.com>
Date: Tue, 14 Jul 2015 19:25:53 +0800
Subject: [PATCH 1/2] Check that vol actually contains DB files, as opposed to
 a non-empty dir. Referencing file list here:
 http://www.postgresql.org/docs/9.1/static/storage-file-layout.html

---
 9.0/docker-entrypoint.sh | 28 +++++++++++++++-------------
 9.1/docker-entrypoint.sh | 28 +++++++++++++++-------------
 9.2/docker-entrypoint.sh | 28 +++++++++++++++-------------
 9.3/docker-entrypoint.sh | 28 +++++++++++++++-------------
 9.4/docker-entrypoint.sh | 28 +++++++++++++++-------------
 9.5/docker-entrypoint.sh | 28 +++++++++++++++-------------
 docker-entrypoint.sh     | 28 +++++++++++++++-------------
 7 files changed, 105 insertions(+), 91 deletions(-)

diff --git a/9.0/docker-entrypoint.sh b/9.0/docker-entrypoint.sh
index 27c98d2147..40eb716850 100755
--- a/9.0/docker-entrypoint.sh
+++ b/9.0/docker-entrypoint.sh
@@ -2,17 +2,19 @@
 set -e
 
 if [ "$1" = 'postgres' ]; then
+	mkdir -p "$PGDATA"
 	chown -R postgres "$PGDATA"
-	
+
 	chmod g+s /run/postgresql
 	chown -R postgres:postgres /run/postgresql
-	
-	if [ -z "$(ls -A "$PGDATA")" ]; then
+
+	# look specifically for PG_VERSION, as it is expected in the DB dir
+	if [ -z "$(ls -A "$PGDATA"/PG_VERSION)" ]; then
 		gosu postgres initdb
-		
+
 		sed -ri "s/^#(listen_addresses\s*=\s*)\S+/\1'*'/" "$PGDATA"/postgresql.conf
-		
-		# check password first so we can ouptut the warning before postgres
+
+		# check password first so we can output the warning before postgres
 		# messes it up
 		if [ "$POSTGRES_PASSWORD" ]; then
 			pass="PASSWORD '$POSTGRES_PASSWORD'"
@@ -27,16 +29,16 @@ if [ "$1" = 'postgres' ]; then
 				         Docker's default configuration, this is
 				         effectively any other container on the same
 				         system.
-				         
+
 				         Use "-e POSTGRES_PASSWORD=password" to set
 				         it in "docker run".
 				****************************************************
 			EOWARN
-			
+
 			pass=
 			authMethod=trust
 		fi
-		
+
 		: ${POSTGRES_USER:=postgres}
 		: ${POSTGRES_DB:=$POSTGRES_USER}
 
@@ -46,7 +48,7 @@ if [ "$1" = 'postgres' ]; then
 			EOSQL
 			echo
 		fi
-		
+
 		if [ "$POSTGRES_USER" = 'postgres' ]; then
 			op='ALTER'
 		else
@@ -57,16 +59,16 @@ if [ "$1" = 'postgres' ]; then
 			$op USER "$POSTGRES_USER" WITH SUPERUSER $pass ;
 		EOSQL
 		echo
-		
+
 		{ echo; echo "host all all 0.0.0.0/0 $authMethod"; } >> "$PGDATA"/pg_hba.conf
-		
+
 		if [ -d /docker-entrypoint-initdb.d ]; then
 			for f in /docker-entrypoint-initdb.d/*.sh; do
 				[ -f "$f" ] && . "$f"
 			done
 		fi
 	fi
-	
+
 	exec gosu postgres "$@"
 fi
 
diff --git a/9.1/docker-entrypoint.sh b/9.1/docker-entrypoint.sh
index 27c98d2147..40eb716850 100755
--- a/9.1/docker-entrypoint.sh
+++ b/9.1/docker-entrypoint.sh
@@ -2,17 +2,19 @@
 set -e
 
 if [ "$1" = 'postgres' ]; then
+	mkdir -p "$PGDATA"
 	chown -R postgres "$PGDATA"
-	
+
 	chmod g+s /run/postgresql
 	chown -R postgres:postgres /run/postgresql
-	
-	if [ -z "$(ls -A "$PGDATA")" ]; then
+
+	# look specifically for PG_VERSION, as it is expected in the DB dir
+	if [ -z "$(ls -A "$PGDATA"/PG_VERSION)" ]; then
 		gosu postgres initdb
-		
+
 		sed -ri "s/^#(listen_addresses\s*=\s*)\S+/\1'*'/" "$PGDATA"/postgresql.conf
-		
-		# check password first so we can ouptut the warning before postgres
+
+		# check password first so we can output the warning before postgres
 		# messes it up
 		if [ "$POSTGRES_PASSWORD" ]; then
 			pass="PASSWORD '$POSTGRES_PASSWORD'"
@@ -27,16 +29,16 @@ if [ "$1" = 'postgres' ]; then
 				         Docker's default configuration, this is
 				         effectively any other container on the same
 				         system.
-				         
+
 				         Use "-e POSTGRES_PASSWORD=password" to set
 				         it in "docker run".
 				****************************************************
 			EOWARN
-			
+
 			pass=
 			authMethod=trust
 		fi
-		
+
 		: ${POSTGRES_USER:=postgres}
 		: ${POSTGRES_DB:=$POSTGRES_USER}
 
@@ -46,7 +48,7 @@ if [ "$1" = 'postgres' ]; then
 			EOSQL
 			echo
 		fi
-		
+
 		if [ "$POSTGRES_USER" = 'postgres' ]; then
 			op='ALTER'
 		else
@@ -57,16 +59,16 @@ if [ "$1" = 'postgres' ]; then
 			$op USER "$POSTGRES_USER" WITH SUPERUSER $pass ;
 		EOSQL
 		echo
-		
+
 		{ echo; echo "host all all 0.0.0.0/0 $authMethod"; } >> "$PGDATA"/pg_hba.conf
-		
+
 		if [ -d /docker-entrypoint-initdb.d ]; then
 			for f in /docker-entrypoint-initdb.d/*.sh; do
 				[ -f "$f" ] && . "$f"
 			done
 		fi
 	fi
-	
+
 	exec gosu postgres "$@"
 fi
 
diff --git a/9.2/docker-entrypoint.sh b/9.2/docker-entrypoint.sh
index 27c98d2147..40eb716850 100755
--- a/9.2/docker-entrypoint.sh
+++ b/9.2/docker-entrypoint.sh
@@ -2,17 +2,19 @@
 set -e
 
 if [ "$1" = 'postgres' ]; then
+	mkdir -p "$PGDATA"
 	chown -R postgres "$PGDATA"
-	
+
 	chmod g+s /run/postgresql
 	chown -R postgres:postgres /run/postgresql
-	
-	if [ -z "$(ls -A "$PGDATA")" ]; then
+
+	# look specifically for PG_VERSION, as it is expected in the DB dir
+	if [ -z "$(ls -A "$PGDATA"/PG_VERSION)" ]; then
 		gosu postgres initdb
-		
+
 		sed -ri "s/^#(listen_addresses\s*=\s*)\S+/\1'*'/" "$PGDATA"/postgresql.conf
-		
-		# check password first so we can ouptut the warning before postgres
+
+		# check password first so we can output the warning before postgres
 		# messes it up
 		if [ "$POSTGRES_PASSWORD" ]; then
 			pass="PASSWORD '$POSTGRES_PASSWORD'"
@@ -27,16 +29,16 @@ if [ "$1" = 'postgres' ]; then
 				         Docker's default configuration, this is
 				         effectively any other container on the same
 				         system.
-				         
+
 				         Use "-e POSTGRES_PASSWORD=password" to set
 				         it in "docker run".
 				****************************************************
 			EOWARN
-			
+
 			pass=
 			authMethod=trust
 		fi
-		
+
 		: ${POSTGRES_USER:=postgres}
 		: ${POSTGRES_DB:=$POSTGRES_USER}
 
@@ -46,7 +48,7 @@ if [ "$1" = 'postgres' ]; then
 			EOSQL
 			echo
 		fi
-		
+
 		if [ "$POSTGRES_USER" = 'postgres' ]; then
 			op='ALTER'
 		else
@@ -57,16 +59,16 @@ if [ "$1" = 'postgres' ]; then
 			$op USER "$POSTGRES_USER" WITH SUPERUSER $pass ;
 		EOSQL
 		echo
-		
+
 		{ echo; echo "host all all 0.0.0.0/0 $authMethod"; } >> "$PGDATA"/pg_hba.conf
-		
+
 		if [ -d /docker-entrypoint-initdb.d ]; then
 			for f in /docker-entrypoint-initdb.d/*.sh; do
 				[ -f "$f" ] && . "$f"
 			done
 		fi
 	fi
-	
+
 	exec gosu postgres "$@"
 fi
 
diff --git a/9.3/docker-entrypoint.sh b/9.3/docker-entrypoint.sh
index 27c98d2147..40eb716850 100755
--- a/9.3/docker-entrypoint.sh
+++ b/9.3/docker-entrypoint.sh
@@ -2,17 +2,19 @@
 set -e
 
 if [ "$1" = 'postgres' ]; then
+	mkdir -p "$PGDATA"
 	chown -R postgres "$PGDATA"
-	
+
 	chmod g+s /run/postgresql
 	chown -R postgres:postgres /run/postgresql
-	
-	if [ -z "$(ls -A "$PGDATA")" ]; then
+
+	# look specifically for PG_VERSION, as it is expected in the DB dir
+	if [ -z "$(ls -A "$PGDATA"/PG_VERSION)" ]; then
 		gosu postgres initdb
-		
+
 		sed -ri "s/^#(listen_addresses\s*=\s*)\S+/\1'*'/" "$PGDATA"/postgresql.conf
-		
-		# check password first so we can ouptut the warning before postgres
+
+		# check password first so we can output the warning before postgres
 		# messes it up
 		if [ "$POSTGRES_PASSWORD" ]; then
 			pass="PASSWORD '$POSTGRES_PASSWORD'"
@@ -27,16 +29,16 @@ if [ "$1" = 'postgres' ]; then
 				         Docker's default configuration, this is
 				         effectively any other container on the same
 				         system.
-				         
+
 				         Use "-e POSTGRES_PASSWORD=password" to set
 				         it in "docker run".
 				****************************************************
 			EOWARN
-			
+
 			pass=
 			authMethod=trust
 		fi
-		
+
 		: ${POSTGRES_USER:=postgres}
 		: ${POSTGRES_DB:=$POSTGRES_USER}
 
@@ -46,7 +48,7 @@ if [ "$1" = 'postgres' ]; then
 			EOSQL
 			echo
 		fi
-		
+
 		if [ "$POSTGRES_USER" = 'postgres' ]; then
 			op='ALTER'
 		else
@@ -57,16 +59,16 @@ if [ "$1" = 'postgres' ]; then
 			$op USER "$POSTGRES_USER" WITH SUPERUSER $pass ;
 		EOSQL
 		echo
-		
+
 		{ echo; echo "host all all 0.0.0.0/0 $authMethod"; } >> "$PGDATA"/pg_hba.conf
-		
+
 		if [ -d /docker-entrypoint-initdb.d ]; then
 			for f in /docker-entrypoint-initdb.d/*.sh; do
 				[ -f "$f" ] && . "$f"
 			done
 		fi
 	fi
-	
+
 	exec gosu postgres "$@"
 fi
 
diff --git a/9.4/docker-entrypoint.sh b/9.4/docker-entrypoint.sh
index 27c98d2147..40eb716850 100755
--- a/9.4/docker-entrypoint.sh
+++ b/9.4/docker-entrypoint.sh
@@ -2,17 +2,19 @@
 set -e
 
 if [ "$1" = 'postgres' ]; then
+	mkdir -p "$PGDATA"
 	chown -R postgres "$PGDATA"
-	
+
 	chmod g+s /run/postgresql
 	chown -R postgres:postgres /run/postgresql
-	
-	if [ -z "$(ls -A "$PGDATA")" ]; then
+
+	# look specifically for PG_VERSION, as it is expected in the DB dir
+	if [ -z "$(ls -A "$PGDATA"/PG_VERSION)" ]; then
 		gosu postgres initdb
-		
+
 		sed -ri "s/^#(listen_addresses\s*=\s*)\S+/\1'*'/" "$PGDATA"/postgresql.conf
-		
-		# check password first so we can ouptut the warning before postgres
+
+		# check password first so we can output the warning before postgres
 		# messes it up
 		if [ "$POSTGRES_PASSWORD" ]; then
 			pass="PASSWORD '$POSTGRES_PASSWORD'"
@@ -27,16 +29,16 @@ if [ "$1" = 'postgres' ]; then
 				         Docker's default configuration, this is
 				         effectively any other container on the same
 				         system.
-				         
+
 				         Use "-e POSTGRES_PASSWORD=password" to set
 				         it in "docker run".
 				****************************************************
 			EOWARN
-			
+
 			pass=
 			authMethod=trust
 		fi
-		
+
 		: ${POSTGRES_USER:=postgres}
 		: ${POSTGRES_DB:=$POSTGRES_USER}
 
@@ -46,7 +48,7 @@ if [ "$1" = 'postgres' ]; then
 			EOSQL
 			echo
 		fi
-		
+
 		if [ "$POSTGRES_USER" = 'postgres' ]; then
 			op='ALTER'
 		else
@@ -57,16 +59,16 @@ if [ "$1" = 'postgres' ]; then
 			$op USER "$POSTGRES_USER" WITH SUPERUSER $pass ;
 		EOSQL
 		echo
-		
+
 		{ echo; echo "host all all 0.0.0.0/0 $authMethod"; } >> "$PGDATA"/pg_hba.conf
-		
+
 		if [ -d /docker-entrypoint-initdb.d ]; then
 			for f in /docker-entrypoint-initdb.d/*.sh; do
 				[ -f "$f" ] && . "$f"
 			done
 		fi
 	fi
-	
+
 	exec gosu postgres "$@"
 fi
 
diff --git a/9.5/docker-entrypoint.sh b/9.5/docker-entrypoint.sh
index 27c98d2147..40eb716850 100755
--- a/9.5/docker-entrypoint.sh
+++ b/9.5/docker-entrypoint.sh
@@ -2,17 +2,19 @@
 set -e
 
 if [ "$1" = 'postgres' ]; then
+	mkdir -p "$PGDATA"
 	chown -R postgres "$PGDATA"
-	
+
 	chmod g+s /run/postgresql
 	chown -R postgres:postgres /run/postgresql
-	
-	if [ -z "$(ls -A "$PGDATA")" ]; then
+
+	# look specifically for PG_VERSION, as it is expected in the DB dir
+	if [ -z "$(ls -A "$PGDATA"/PG_VERSION)" ]; then
 		gosu postgres initdb
-		
+
 		sed -ri "s/^#(listen_addresses\s*=\s*)\S+/\1'*'/" "$PGDATA"/postgresql.conf
-		
-		# check password first so we can ouptut the warning before postgres
+
+		# check password first so we can output the warning before postgres
 		# messes it up
 		if [ "$POSTGRES_PASSWORD" ]; then
 			pass="PASSWORD '$POSTGRES_PASSWORD'"
@@ -27,16 +29,16 @@ if [ "$1" = 'postgres' ]; then
 				         Docker's default configuration, this is
 				         effectively any other container on the same
 				         system.
-				         
+
 				         Use "-e POSTGRES_PASSWORD=password" to set
 				         it in "docker run".
 				****************************************************
 			EOWARN
-			
+
 			pass=
 			authMethod=trust
 		fi
-		
+
 		: ${POSTGRES_USER:=postgres}
 		: ${POSTGRES_DB:=$POSTGRES_USER}
 
@@ -46,7 +48,7 @@ if [ "$1" = 'postgres' ]; then
 			EOSQL
 			echo
 		fi
-		
+
 		if [ "$POSTGRES_USER" = 'postgres' ]; then
 			op='ALTER'
 		else
@@ -57,16 +59,16 @@ if [ "$1" = 'postgres' ]; then
 			$op USER "$POSTGRES_USER" WITH SUPERUSER $pass ;
 		EOSQL
 		echo
-		
+
 		{ echo; echo "host all all 0.0.0.0/0 $authMethod"; } >> "$PGDATA"/pg_hba.conf
-		
+
 		if [ -d /docker-entrypoint-initdb.d ]; then
 			for f in /docker-entrypoint-initdb.d/*.sh; do
 				[ -f "$f" ] && . "$f"
 			done
 		fi
 	fi
-	
+
 	exec gosu postgres "$@"
 fi
 
diff --git a/docker-entrypoint.sh b/docker-entrypoint.sh
index 27c98d2147..40eb716850 100755
--- a/docker-entrypoint.sh
+++ b/docker-entrypoint.sh
@@ -2,17 +2,19 @@
 set -e
 
 if [ "$1" = 'postgres' ]; then
+	mkdir -p "$PGDATA"
 	chown -R postgres "$PGDATA"
-	
+
 	chmod g+s /run/postgresql
 	chown -R postgres:postgres /run/postgresql
-	
-	if [ -z "$(ls -A "$PGDATA")" ]; then
+
+	# look specifically for PG_VERSION, as it is expected in the DB dir
+	if [ -z "$(ls -A "$PGDATA"/PG_VERSION)" ]; then
 		gosu postgres initdb
-		
+
 		sed -ri "s/^#(listen_addresses\s*=\s*)\S+/\1'*'/" "$PGDATA"/postgresql.conf
-		
-		# check password first so we can ouptut the warning before postgres
+
+		# check password first so we can output the warning before postgres
 		# messes it up
 		if [ "$POSTGRES_PASSWORD" ]; then
 			pass="PASSWORD '$POSTGRES_PASSWORD'"
@@ -27,16 +29,16 @@ if [ "$1" = 'postgres' ]; then
 				         Docker's default configuration, this is
 				         effectively any other container on the same
 				         system.
-				         
+
 				         Use "-e POSTGRES_PASSWORD=password" to set
 				         it in "docker run".
 				****************************************************
 			EOWARN
-			
+
 			pass=
 			authMethod=trust
 		fi
-		
+
 		: ${POSTGRES_USER:=postgres}
 		: ${POSTGRES_DB:=$POSTGRES_USER}
 
@@ -46,7 +48,7 @@ if [ "$1" = 'postgres' ]; then
 			EOSQL
 			echo
 		fi
-		
+
 		if [ "$POSTGRES_USER" = 'postgres' ]; then
 			op='ALTER'
 		else
@@ -57,16 +59,16 @@ if [ "$1" = 'postgres' ]; then
 			$op USER "$POSTGRES_USER" WITH SUPERUSER $pass ;
 		EOSQL
 		echo
-		
+
 		{ echo; echo "host all all 0.0.0.0/0 $authMethod"; } >> "$PGDATA"/pg_hba.conf
-		
+
 		if [ -d /docker-entrypoint-initdb.d ]; then
 			for f in /docker-entrypoint-initdb.d/*.sh; do
 				[ -f "$f" ] && . "$f"
 			done
 		fi
 	fi
-	
+
 	exec gosu postgres "$@"
 fi
 

From 9c7bb73021815a17fae056508f54b764d7aefc5b Mon Sep 17 00:00:00 2001
From: Victor Heng <bakavic@gmail.com>
Date: Sun, 19 Jul 2015 00:41:18 +0800
Subject: [PATCH 2/2] Check that PG_VERSION is non-empty.

---
 9.0/docker-entrypoint.sh | 2 +-
 9.1/docker-entrypoint.sh | 2 +-
 9.2/docker-entrypoint.sh | 2 +-
 9.3/docker-entrypoint.sh | 2 +-
 9.4/docker-entrypoint.sh | 2 +-
 9.5/docker-entrypoint.sh | 2 +-
 docker-entrypoint.sh     | 2 +-
 7 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/9.0/docker-entrypoint.sh b/9.0/docker-entrypoint.sh
index 40eb716850..5691f092cb 100755
--- a/9.0/docker-entrypoint.sh
+++ b/9.0/docker-entrypoint.sh
@@ -9,7 +9,7 @@ if [ "$1" = 'postgres' ]; then
 	chown -R postgres:postgres /run/postgresql
 
 	# look specifically for PG_VERSION, as it is expected in the DB dir
-	if [ -z "$(ls -A "$PGDATA"/PG_VERSION)" ]; then
+	if [ -s "$PGDATA/PG_VERSION" ]; then
 		gosu postgres initdb
 
 		sed -ri "s/^#(listen_addresses\s*=\s*)\S+/\1'*'/" "$PGDATA"/postgresql.conf
diff --git a/9.1/docker-entrypoint.sh b/9.1/docker-entrypoint.sh
index 40eb716850..5691f092cb 100755
--- a/9.1/docker-entrypoint.sh
+++ b/9.1/docker-entrypoint.sh
@@ -9,7 +9,7 @@ if [ "$1" = 'postgres' ]; then
 	chown -R postgres:postgres /run/postgresql
 
 	# look specifically for PG_VERSION, as it is expected in the DB dir
-	if [ -z "$(ls -A "$PGDATA"/PG_VERSION)" ]; then
+	if [ -s "$PGDATA/PG_VERSION" ]; then
 		gosu postgres initdb
 
 		sed -ri "s/^#(listen_addresses\s*=\s*)\S+/\1'*'/" "$PGDATA"/postgresql.conf
diff --git a/9.2/docker-entrypoint.sh b/9.2/docker-entrypoint.sh
index 40eb716850..5691f092cb 100755
--- a/9.2/docker-entrypoint.sh
+++ b/9.2/docker-entrypoint.sh
@@ -9,7 +9,7 @@ if [ "$1" = 'postgres' ]; then
 	chown -R postgres:postgres /run/postgresql
 
 	# look specifically for PG_VERSION, as it is expected in the DB dir
-	if [ -z "$(ls -A "$PGDATA"/PG_VERSION)" ]; then
+	if [ -s "$PGDATA/PG_VERSION" ]; then
 		gosu postgres initdb
 
 		sed -ri "s/^#(listen_addresses\s*=\s*)\S+/\1'*'/" "$PGDATA"/postgresql.conf
diff --git a/9.3/docker-entrypoint.sh b/9.3/docker-entrypoint.sh
index 40eb716850..5691f092cb 100755
--- a/9.3/docker-entrypoint.sh
+++ b/9.3/docker-entrypoint.sh
@@ -9,7 +9,7 @@ if [ "$1" = 'postgres' ]; then
 	chown -R postgres:postgres /run/postgresql
 
 	# look specifically for PG_VERSION, as it is expected in the DB dir
-	if [ -z "$(ls -A "$PGDATA"/PG_VERSION)" ]; then
+	if [ -s "$PGDATA/PG_VERSION" ]; then
 		gosu postgres initdb
 
 		sed -ri "s/^#(listen_addresses\s*=\s*)\S+/\1'*'/" "$PGDATA"/postgresql.conf
diff --git a/9.4/docker-entrypoint.sh b/9.4/docker-entrypoint.sh
index 40eb716850..5691f092cb 100755
--- a/9.4/docker-entrypoint.sh
+++ b/9.4/docker-entrypoint.sh
@@ -9,7 +9,7 @@ if [ "$1" = 'postgres' ]; then
 	chown -R postgres:postgres /run/postgresql
 
 	# look specifically for PG_VERSION, as it is expected in the DB dir
-	if [ -z "$(ls -A "$PGDATA"/PG_VERSION)" ]; then
+	if [ -s "$PGDATA/PG_VERSION" ]; then
 		gosu postgres initdb
 
 		sed -ri "s/^#(listen_addresses\s*=\s*)\S+/\1'*'/" "$PGDATA"/postgresql.conf
diff --git a/9.5/docker-entrypoint.sh b/9.5/docker-entrypoint.sh
index 40eb716850..5691f092cb 100755
--- a/9.5/docker-entrypoint.sh
+++ b/9.5/docker-entrypoint.sh
@@ -9,7 +9,7 @@ if [ "$1" = 'postgres' ]; then
 	chown -R postgres:postgres /run/postgresql
 
 	# look specifically for PG_VERSION, as it is expected in the DB dir
-	if [ -z "$(ls -A "$PGDATA"/PG_VERSION)" ]; then
+	if [ -s "$PGDATA/PG_VERSION" ]; then
 		gosu postgres initdb
 
 		sed -ri "s/^#(listen_addresses\s*=\s*)\S+/\1'*'/" "$PGDATA"/postgresql.conf
diff --git a/docker-entrypoint.sh b/docker-entrypoint.sh
index 40eb716850..5691f092cb 100755
--- a/docker-entrypoint.sh
+++ b/docker-entrypoint.sh
@@ -9,7 +9,7 @@ if [ "$1" = 'postgres' ]; then
 	chown -R postgres:postgres /run/postgresql
 
 	# look specifically for PG_VERSION, as it is expected in the DB dir
-	if [ -z "$(ls -A "$PGDATA"/PG_VERSION)" ]; then
+	if [ -s "$PGDATA/PG_VERSION" ]; then
 		gosu postgres initdb
 
 		sed -ri "s/^#(listen_addresses\s*=\s*)\S+/\1'*'/" "$PGDATA"/postgresql.conf