add docker files

Dockerfile

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+FROM postgres:9.4.12
+
+RUN rm docker-entrypoint.sh
+COPY docker-entrypoint.sh /usr/local/bin/
+RUN ln -s usr/local/bin/docker-entrypoint.sh

README.md

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+Complete copy of an official Postgres docker image but with one change - all scripts under /docker-entrypoint-initdb.d are executed for each start, not just the first one.

docker-entrypoint.sh

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+#!/bin/bash
+set -e
+
+# usage: file_env VAR [DEFAULT]
+#    ie: file_env 'XYZ_DB_PASSWORD' 'example'
+# (will allow for "$XYZ_DB_PASSWORD_FILE" to fill in the value of
+#  "$XYZ_DB_PASSWORD" from a file, especially for Docker's secrets feature)
+file_env() {
+	local var="$1"
+	local fileVar="${var}_FILE"
+	local def="${2:-}"
+	if [ "${!var:-}" ] && [ "${!fileVar:-}" ]; then
+		echo >&2 "error: both $var and $fileVar are set (but are exclusive)"
+		exit 1
+	fi
+	local val="$def"
+	if [ "${!var:-}" ]; then
+		val="${!var}"
+	elif [ "${!fileVar:-}" ]; then
+		val="$(< "${!fileVar}")"
+	fi
+	export "$var"="$val"
+	unset "$fileVar"
+}
+
+if [ "${1:0:1}" = '-' ]; then
+	set -- postgres "$@"
+fi
+
+# allow the container to be started with `--user`
+if [ "$1" = 'postgres' ] && [ "$(id -u)" = '0' ]; then
+	mkdir -p "$PGDATA"
+	chown -R postgres "$PGDATA"
+	chmod 700 "$PGDATA"
+
+	mkdir -p /var/run/postgresql
+	chown -R postgres /var/run/postgresql
+	chmod 775 /var/run/postgresql
+
+	# Create the transaction log directory before initdb is run (below) so the directory is owned by the correct user
+	if [ "$POSTGRES_INITDB_XLOGDIR" ]; then
+		mkdir -p "$POSTGRES_INITDB_XLOGDIR"
+		chown -R postgres "$POSTGRES_INITDB_XLOGDIR"
+		chmod 700 "$POSTGRES_INITDB_XLOGDIR"
+	fi
+
+	exec gosu postgres "$BASH_SOURCE" "$@"
+fi
+
+if [ "$1" = 'postgres' ]; then
+	mkdir -p "$PGDATA"
+	chown -R "$(id -u)" "$PGDATA" 2>/dev/null || :
+	chmod 700 "$PGDATA" 2>/dev/null || :
+
+	# look specifically for PG_VERSION, as it is expected in the DB dir
+	if [ ! -s "$PGDATA/PG_VERSION" ]; then
+		file_env 'POSTGRES_INITDB_ARGS'
+		if [ "$POSTGRES_INITDB_XLOGDIR" ]; then
+			export POSTGRES_INITDB_ARGS="$POSTGRES_INITDB_ARGS --xlogdir $POSTGRES_INITDB_XLOGDIR"
+		fi
+		eval "initdb --username=postgres $POSTGRES_INITDB_ARGS"
+
+		# check password first so we can output the warning before postgres
+		# messes it up
+		file_env 'POSTGRES_PASSWORD'
+		if [ "$POSTGRES_PASSWORD" ]; then
+			pass="PASSWORD '$POSTGRES_PASSWORD'"
+			authMethod=md5
+		else
+			# The - option suppresses leading tabs but *not* spaces. :)
+			cat >&2 <<-'EOWARN'
+				****************************************************
+				WARNING: No password has been set for the database.
+				         This will allow anyone with access to the
+				         Postgres port to access your database. In
+				         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
+
+		{
+			echo
+			echo "host all all all $authMethod"
+		} >> "$PGDATA/pg_hba.conf"
+
+		# internal start of server in order to allow set-up using psql-client
+		# does not listen on external TCP/IP and waits until start finishes
+		PGUSER="${PGUSER:-postgres}" \
+		pg_ctl -D "$PGDATA" \
+			-o "-c listen_addresses='localhost'" \
+			-w start
+
+		file_env 'POSTGRES_USER' 'postgres'
+		file_env 'POSTGRES_DB' "$POSTGRES_USER"
+
+		psql=( psql -v ON_ERROR_STOP=1 )
+
+		if [ "$POSTGRES_DB" != 'postgres' ]; then
+			"${psql[@]}" --username postgres <<-EOSQL
+				CREATE DATABASE "$POSTGRES_DB" ;
+			EOSQL
+			echo
+		fi
+
+		if [ "$POSTGRES_USER" = 'postgres' ]; then
+			op='ALTER'
+		else
+			op='CREATE'
+		fi
+		"${psql[@]}" --username postgres <<-EOSQL
+			$op USER "$POSTGRES_USER" WITH SUPERUSER $pass ;
+		EOSQL
+		echo
+
+		psql+=( --username "$POSTGRES_USER" --dbname "$POSTGRES_DB" )
+
+		echo
+		for f in /docker-entrypoint-initdb.d/*; do
+			case "$f" in
+				*.sh)     echo "$0: running $f"; . "$f" ;;
+				*.sql)    echo "$0: running $f"; "${psql[@]}" -f "$f"; echo ;;
+				*.sql.gz) echo "$0: running $f"; gunzip -c "$f" | "${psql[@]}"; echo ;;
+				*)        echo "$0: ignoring $f" ;;
+			esac
+			echo
+		done
+
+		PGUSER="${PGUSER:-postgres}" \
+		pg_ctl -D "$PGDATA" -m fast -w stop
+
+		echo
+		echo 'PostgreSQL init process complete; ready for start up.'
+		echo
+        else
+                # internal start of server in order to allow set-up using psql-client
+                # does not listen on external TCP/IP and waits until start finishes
+                PGUSER="${PGUSER:-postgres}" \
+                pg_ctl -D "$PGDATA" \
+                        -o "-c listen_addresses='localhost'" \
+                        -w start      
+
+                file_env 'POSTGRES_USER' 'postgres'
+                file_env 'POSTGRES_DB' "$POSTGRES_USER"
+
+                psql=( psql -v ON_ERROR_STOP=1 )
+                psql+=( --username "$POSTGRES_USER" --dbname "$POSTGRES_DB" )
+
+                echo
+                for f in /docker-entrypoint-initdb.d/*; do
+                        case "$f" in
+                                *.sh)     echo "$0: running $f"; . "$f" ;;
+                                *.sql)    echo "$0: running $f"; "${psql[@]}" -f "$f"; echo ;;
+                                *.sql.gz) echo "$0: running $f"; gunzip -c "$f" | "${psql[@]}"; echo ;;
+                                *)        echo "$0: ignoring $f" ;;
+                        esac
+                        echo
+                done
+
+                PGUSER="${PGUSER:-postgres}" \
+                pg_ctl -D "$PGDATA" -m fast -w stop
+
+                echo
+                echo 'PostgreSQL REinit process complete; ready for start up.'
+                echo
+	fi
+fi
+
+exec "$@"