test: avoid subprocesses when reading fixture process identities

config/docker/headless-serve-shutdown/run-appimage-desktop-startup-case.sh

@@ -48,9 +48,12 @@ read_start_ticks() {
   local pid=$1
   [[ -r "/proc/$pid/stat" ]] || return 1
   local stat
-  stat=$(cat "/proc/$pid/stat") || return 1
+  local -a fields
+  stat=$(<"/proc/$pid/stat") || return 1
   # comm is parenthesized and may contain spaces or parentheses.
-  awk '{print $20}' <<< "${stat##*) }"
+  read -r -a fields <<< "${stat##*) }"
+  ((${#fields[@]} >= 20)) || return 1
+  printf '%s\n' "${fields[19]}"
 }
 
 identity_alive() {
@@ -208,8 +211,8 @@ report_launcher_exit() {
 cleanup() {
   local status=$?
   trap - EXIT
-  collect_state_processes TERM
   signal_process_group TERM || true
+  collect_state_processes TERM
   signal_owned_processes TERM || true
   if ! wait_for_owned_exit 10 TERM; then
     signal_process_group KILL || true

config/scripts/appimage-startup-cleanup.test.mjs

@@ -12,7 +12,8 @@ const functions = oracle.slice(oracle.indexOf('read_start_ticks()'), oracle.inde
 
 function isRunning(pid) {
   try {
-    return readFileSync(`/proc/${pid}/stat`, 'utf8').split(') ')[1][0] !== 'Z'
+    const stat = readFileSync(`/proc/${pid}/stat`, 'utf8')
+    return stat.slice(stat.lastIndexOf(') ') + 2)[0] !== 'Z'
   } catch {
     return false
   }