Fix waterfall.sh on Mac...

tools/valgrind/waterfall.sh

 #!/bin/bash
 
 # Copyright (c) 2010 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # This script can be used by waterfall sheriffs to fetch the status
 # of Valgrind bots on the memory waterfall and test if their local
 # suppressions match the reports on the waterfall.
 
@@ skipping 57 matching lines @@
     # TODO(timurrrr): OTOH, we won't be able to check
     # if some suppression is not used anymore.
     LIST_OF_BUILDS=$(grep "rev.*<a href=\"\.\./builders/.*/builds/[0-9]\+" \
                      "$LOGS_DIR/slave_$S" | head -n 2 | \
                      grep "failed" | grep -v "failed compile" | \
                      sed "s/.*\/builds\///" | sed "s/\".*//")
 
     for BUILD in $LIST_OF_BUILDS
     do
       # We'll fetch a few tiny URLs now, let's use a temp file.
-      TMPFILE=$(mktemp)
+      TMPFILE=$(mktemp -t memory_waterfall.XXXXXX)
       download $SLAVE_URL/builds/$BUILD "$TMPFILE"
 
       REPORT_FILE="$LOGS_DIR/report_${S}_${BUILD}"
       rm -f $REPORT_FILE 2>/dev/null || true  # make sure it doesn't exist
 
       REPORT_URLS=$(grep -o "[0-9]\+/steps/memory.*/logs/[0-9A-F]\{16\}" \
                     "$TMPFILE" || true)  # `true` is to succeed on empty output
       FAILED_TESTS=$(grep -o "[0-9]\+/steps/memory.*/logs/[A-Za-z0-9.]\+" \
                      "$TMPFILE" | grep -v "[0-9A-F]\{16\}" | grep -v "stdio" \
                      || true)
@@ skipping 165 matching lines @@
   find_blame "$2" "$3" "$4"
 else
   THISNAME=$(basename "${0}")
   echo "Usage: $THISNAME fetch|match|blame <builder> <test> <hash>"
   echo "  fetch - Fetch Valgrind logs from the memory waterfall"
   echo "  match - Test the local suppression files against the downloaded logs"
   echo "  blame - Return the blame list for the revision where the suppression"
   echo "          <hash> occured for the first time in the log for <test> on"
   echo "          <builder>"
 fi