archiveloop: skip clean when user drives away

If the archive server is no longer reachable after archiving ends,
assume the user drove away and skip the cleaning step to avoid the
drive being disconnected from the car while driving.
Also skip cleaning if the last cleaning was less than 5 minutes ago,
to avoid double-cleaning when booting up in wifi range.

run/archiveloop

@@ -355,6 +355,19 @@ function intersect {
 }
 
 function clean_cam_mount {
+
+  if [ -e /tmp/last_clean_time ]
+  then
+    read -r -d . last < /tmp/last_clean_time
+    read -r -d . now < /proc/uptime
+    if (( (now - last) < 300 ))
+    then
+      log "skipping cleaning cam mount"
+      return
+    fi
+  fi
+  cat /proc/uptime > /tmp/last_clean_time
+
   log "cleaning cam mount"
   ensure_cam_file_is_mounted
 
@@ -615,7 +628,12 @@ function archive_teslacam_clips () {
   # overlayfs behavior is undefined if the lower is changed while the overlay is active, so umount first
   umount "$overlaymerged"
 
-  clean_cam_mount
+  if archive_is_reachable
+  then
+    clean_cam_mount
+  else
+    log "Archive not reachable, assuming user drove away, skipping cleaning step"
+  fi
 }
 
 function copy_music_files () {