Fixing Mac vs Linux bash shell'ism.

Signed-off-by: Chad Metcalf <chad@docker.com>

gitea-postgres/test.sh

@@ -0,0 +1,28 @@
+#!/bin/bash
+
+for service in $(docker-compose ps -q); do
+
+    # simple test to check that any exposed port has something actually listening
+    # assumes format 22/tcp, 0.0.0.0:3000->3000/tcp
+    ports_string=$(docker ps --filter="ID=${service}" --format "{{.Ports}}")
+
+    OIFS=${IFS}; IFS=','; service_port=("$ports_string"); IFS=${OIFS}; unset OIFS;
+
+    for i in "${service_port[@]}"; do
+
+        protocol=$(expr "${i}" : '.*\(...$\)')
+
+        # the || true here just makes sure bats doesn't fail the test because a
+        # port wasn't matched. We will check for empty ports later
+        port=$(expr "${i}" : '.*:\([0-9]*\)->' || true)
+
+        if [[ ${protocol} == "tcp" ]] && [[ ! -z ${port} ]]; then
+            run nc -z -v localhost "${port}"
+            [ "${?}" -eq 0  ]
+        elif [[ "${protocol}" = "udp" ]] && [[ ! -z ${port} ]]; then
+            run nc -z -v -u localhost "${port}"
+            [ "${?}" -eq 0  ]
+        fi
+
+    done
+done