Make tests more reliable

* ensure config and creds are ready before attempting auth
* warn instead of error on DUT shutdown failures

change-type: patch

src/balena-tests/balena.sh

@@ -1,7 +1,7 @@
 #!/usr/bin/env bash
 
 # shellcheck disable=SC2154,SC2034,SC1090
-set -ae
+set -aeu
 
 curl_opts="--retry 3 --fail"
 if [[ $VERBOSE =~ on|On|Yes|yes|true|True ]]; then
@@ -41,7 +41,9 @@ function shutdown_dut() {
 
     if [[ -n $balena_device_uuid ]]; then
         with_backoff balena device "${balena_device_uuid}"
-        with_backoff balena device shutdown -f "${balena_device_uuid}"
+        if ! with_backoff balena device shutdown -f "${balena_device_uuid}"; then
+            echo 'DUT failed to shutdown properly'
+        fi
     fi
 }
 
@@ -303,7 +305,17 @@ GUEST_IMAGE=${GUEST_IMAGE:-/balena/balena.img}
 OS_VERSION="$(get_os_version)"
 TEST_FLEET=${TEST_FLEET:-test-fleet}
 
-[[ -f "$CONF" ]] && source "${CONF}"
+# wait here until global config is ready
+until [[ -s "$CONF" ]]; do
+    sleep "$(( (RANDOM % 5) + 5 ))s"
+done
+source "${CONF}"
+
+# wait her until we have valid login credentials
+until [[ -n "$SUPERUSER_EMAIL" ]] && [[ -n "$SUPERUSER_PASSWORD" ]]; do
+    sleep "$(( (RANDOM % 5) + 5 ))s"
+    source "${CONF}"
+done
 
 update_ca_certificates  # ensure self-signed root CA certificate(s) trust