Hard fail immediately in crash_sender if /usr/bin/find is not installed

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
 
 # File whose existence implies crash reports may be sent, and whose
 # contents includes our machine's anonymized guid.
 CONSENT_ID="/home/chronos/Consent To Send Stats"
 
+# Path to find which is required for computing the crash rate.
+FIND="/usr/bin/find"
+
 # Send up to 8 crashes per day.
 MAX_CRASH_RATE=8
 
 # URL to send non-official build crashes to.
 MINIDUMP_UPLOAD_STAGING_URL="http://clients2.google.com/cr/staging_report"
 
 # URL to send official build crashes to.
 MINIDUMP_UPLOAD_PROD_URL="http://clients2.google.com/cr/report"
 
 # File whose existence mocks crash sending.  If empty we pretend the
@@ skipping 68 matching lines @@
 is_on_3g() {
   # See crosbug.com/3304.
   return 1
 }
 
 # Check if sending a crash now does not exceed the maximum 24hr rate and
 # commit to doing so, if not.
 check_rate() {
   mkdir -p ${TIMESTAMPS_DIR}
   # Only consider minidumps written in the past 24 hours by removing all older.
-  find "${TIMESTAMPS_DIR}" -mindepth 1 -mmin +$((24 * 60)) -exec rm '{}' ';'
+  ${FIND} "${TIMESTAMPS_DIR}" -mindepth 1 -mmin +$((24 * 60)) -exec rm '{}' ';'
   local sends_in_24hrs=$(echo "${TIMESTAMPS_DIR}"/* | wc -w)
   lecho "Current send rate: ${sends_in_24hrs}sends/24hrs"
   if [ ${sends_in_24hrs} -ge ${MAX_CRASH_RATE} ]; then
     lecho "Cannot send more crashes:"
     lecho "  current ${sends_in_24hrs}send/24hrs >= " \
           "max ${MAX_CRASH_RATE}send/24hrs"
     return 1
   fi
   mktemp "${TIMESTAMPS_DIR}"/XXXX > /dev/null
   return 0
@@ skipping 103 matching lines @@
 }
 
 main() {
   if [ -e "${PAUSE_CRASH_SENDING}" ]; then
     lecho "Exiting early due to ${PAUSE_CRASH_SENDING}"
     exit 1
   fi
 
   check_not_already_running
 
+  if [ ! -x "${FIND}" ]; then
+    lecho "Fatal: Crash sending disabled: ${FIND} not found."
+    exit 1
+  fi
+
   TMP_DIR="$(mktemp -d /tmp/crash_sender.XXXX)"
   trap cleanup_tmp_dir EXIT INT
 
   # Send system-wide crashes
   send_crashes "/var/spool/crash"
 
   # Send user-specific crashes
   send_crashes "/home/chronos/user/crash"
 }
 
 main