chore(linux): Improve process check

linux/ibus-keyman/tests/scripts/test-helper.inc.sh

@@ -323,14 +323,9 @@ function exit_on_package_build() {
   fi
 }
 
-function check_processes_running() {
-  local DISPLAY_SERVER ENV_FILE CLEANUP_FILE PID_FILE LINE PID MISSING MISSING_PROCS TEST_NAME
-  DISPLAY_SERVER=$1
-  ENV_FILE=$2
-  CLEANUP_FILE=$3
-  PID_FILE=$4
-  TEST_NAME=$5
-  MISSING=false
+function _get_missing_processes() {
+  local PID_FILE MISSING_PROCS PID LINE
+  PID_FILE=$1
   MISSING_PROCS=""
 
   while read -r LINE; do
@@ -339,13 +334,22 @@ function check_processes_running() {
     fi
     PID=$(echo "$LINE" | cut -d' ' -f1)
     if ! ps --no-headers --pid="$PID" > /dev/null; then
-      MISSING=true
       MISSING_PROCS="${MISSING_PROCS}    $(echo "$LINE" | cut -d' ' -f2)"
       break
     fi
   done < "${PID_FILE}"
+}
+
+function check_processes_running() {
+  local DISPLAY_SERVER ENV_FILE CLEANUP_FILE PID_FILE MISSING_PROCS TEST_NAME
+  DISPLAY_SERVER=$1
+  ENV_FILE=$2
+  CLEANUP_FILE=$3
+  PID_FILE=$4
+  TEST_NAME=$5
+  MISSING_PROCS=$(_get_missing_processes "$PID_FILE")
 
-  if $MISSING; then
+  if [ "$MISSING_PROCS" != "" ]; then
     echo "# Some background processes no longer running. Restarting..."
     { echo "Some background processes no longer running (running ${TEST_NAME}):" ; \
       echo "$MISSING_PROCS" ; \
@@ -354,4 +358,9 @@ function check_processes_running() {
     cleanup "${CLEANUP_FILE}" > /dev/null 2>&1
     setup "${DISPLAY_SERVER}" "${ENV_FILE}" "${CLEANUP_FILE}" "${PID_FILE}" > /dev/null 2>&1
   fi
+
+  if [ "$(_get_missing_processes "$PID_FILE")" != "" ]; then
+    echo "# WARNING: Expected background processes are still missing after restart: ${MISSING_PROCS}"
+    echo "# Maybe an old process is still running?"
+  fi
 }