tools/dashboard: follow latest build if not locked to P/D/A

tools/dashboard

@@ -3,17 +3,35 @@
 # SPDX-License-Identifier: GPL-2.0
 # Copyright (C) 2019-present Team LibreELEC (https://libreelec.tv)
 
-. config/options ""
+cd "$(readlink -f "$(dirname "$0")")/.."
+
+if [ -n "${PROJECT}" -a "$1" != "auto" ]; then
+  . config/options ""
+fi
+
+_find_latest_tcdir() {
+  if [ -n "${THREAD_CONTROL}" ]; then
+    echo "${THREAD_CONTROL}"
+  else
+    ls -1tdr "${PWD}"/build.*/.threads 2>/dev/null | tail -1
+  fi
+}
 
 while [ : ]; do
   echo "Waiting for build to start..."
+
   while [ : ]; do
-    pid="$(cat "${THREAD_CONTROL}/pid" 2>/dev/null || true)"
-    [ -n "${pid}" ] && ps -p ${pid} &>/dev/null && break
+    tcdir="$(_find_latest_tcdir)"
+
+    if [ -n "${tcdir}" ]; then
+      pid="$(cat "${tcdir}/pid" 2>/dev/null || true)"
+      [ -n "${pid}" ] && ps -p ${pid} &>/dev/null && break
+    fi
+
     sleep 1.0
   done
 
-  tail -Fn+0 --pid=${pid} ${THREAD_CONTROL}/status 2>/dev/null
+  tail -Fn+0 --pid=${pid} "${tcdir}/status" 2>/dev/null
 
   echo
 done