crash-reporter: fix race condition between cron crash_sender and test invoked

crash_sender

 #!/bin/sh
 
 # Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 set -e
 
 # Product ID in crash report
 CHROMEOS_PRODUCT=ChromeOS
@@ skipping 10 matching lines @@
 # Path to find which is required for computing the crash rate.
 FIND="/usr/bin/find"
 
 # Set this to 1 in the environment to allow uploading crash reports
 # for unofficial versions.
 FORCE_OFFICIAL=${FORCE_OFFICIAL:-0}
 
 # Path to hardware class description.
 HWCLASS_PATH="/sys/devices/platform/chromeos_acpi/HWID"
 
+# Ignore PAUSE_CRASH_SENDING file if set.
+OVERRIDE_PAUSE_SENDING=${OVERRIDE_PAUSE_SENDING:-0}
+
 # Maximum crashes to send per day.
 MAX_CRASH_RATE=${MAX_CRASH_RATE:-32}
 
 # Path to metrics_client.
 METRICS_CLIENT="/usr/bin/metrics_client"
 
 # File whose existence mocks crash sending.  If empty we pretend the
 # crash sending was successful, otherwise unsuccessful.
 MOCK_CRASH_SENDING="/tmp/mock-crash-sending"
 
@@ skipping 295 matching lines @@
     fi
 
     # Send was successful, now remove.
     lecho "Successfully sent crash ${meta_path} and removing."
     remove_report "${meta_path}"
   done
 }
 
 main() {
   trap cleanup EXIT INT TERM
-  if [ -e "${PAUSE_CRASH_SENDING}" ]; then
+  if [ -e "${PAUSE_CRASH_SENDING}" ] && \
+     [ ${OVERRIDE_PAUSE_SENDING} -eq 0 ]; then
     lecho "Exiting early due to ${PAUSE_CRASH_SENDING}."
     exit 1
   fi
 
   check_not_already_running
 
   for dependency in "${FIND}" "${METRICS_CLIENT}"; do
     if [ ! -x "${dependency}" ]; then
       lecho "Fatal: Crash sending disabled: ${dependency} not found."
       exit 1
     fi
   done
 
   TMP_DIR="$(mktemp -d /tmp/crash_sender.XXXX)"
 
   # Send system-wide crashes
   send_crashes "/var/spool/crash"
 
   # Send user-specific crashes
   send_crashes "/home/chronos/user/crash"
 }
 
 main