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diff --git a/testkit/prepare_tools.sh b/testkit/prepare_tools.sh
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+#!/bin/bash
+
+# Author: Chris Koeritz
+#
+# Note:
+# We do not want to "exit" from this file at all (nor from any file that it
+# invokes either), since this script is intended for use by the bash 'source'
+# command.  If we exit, that will exit from the calling shell as well, which
+# torpedoes whatever one was doing in that shell.
+# There is a variable below called BADNESS that indicates when errors
+# occurred during processing, and if it's not empty at the end of the script
+# then we will consider this a failed run, and we will not set the test's
+# sentinel variable which other scripts check to see if the environment
+# was loaded properly.
+
+# make sure whether they have defined the top-level location for us.
+if [ ! -z "$1" ]; then
+  # first attempt is to use the first parameter, if one is provided.  this should
+  # be an absolute path reference to this very file, from which we can deduce the
+  # starting directory.
+  GRITTY_TESTING_TOP_LEVEL="$( cd "$( dirname "$1" )" && \pwd )"
+  # for this case, they also don't need to be stranded in a new shell, because we
+  # assume they have sourced this file instead of bashing it.
+  NO_SUBSHELL=true
+fi
+if [ -z "$GRITTY_TESTING_TOP_LEVEL" ]; then
+  # otherwise, if they didn't explicitly set the top-level directory, we will
+  # do it using some unix trickery.
+  if [[ "$0" =~ .*bash ]]; then
+    echo "----"
+    echo "This script was not launched properly with 'source'.  The script should"
+    echo "be started like this: source prepare_tools.sh prepare_tools.sh"
+    echo "The double entry is required for bash's source command to find the path."
+    BADNESS=true
+  fi
+  GRITTY_TESTING_TOP_LEVEL="$( cd "$( dirname "$0" 2>/dev/null )" && \pwd )"
+else
+  # we assume they are managing this script more closely and do not need (or want) a bash sub-shell.
+  NO_SUBSHELL=true
+fi
+GRITTY_TESTING_TOP_LEVEL="$(echo "$GRITTY_TESTING_TOP_LEVEL" | sed -e 's/\/cygdrive\/\(.\)/\1:/')"
+
+# the top-level directory for tests, i.e. the root of testing hierarchy.
+export TESTKIT_ROOT="$GRITTY_TESTING_TOP_LEVEL"
+
+# a bit of a dance to not pull in code too early...
+export TESTKIT_BOOTSTRAPPING=true
+source "$TESTKIT_ROOT/library/establish_environment.sh"
+unset TESTKIT_BOOTSTRAPPING
+# done with dancing, ready to pull in anything else from testkit.
+
+#source "$TESTKIT_ROOT/library/helper_methods.sh"
+
+# where the shunit library resides.
+export SHUNIT_DIR="$TESTKIT_ROOT/shunit"
+
+# establish the TMP variable if it's not already set.
+export TMP
+if [ -z "$TMP" ]; then
+  TMP="$HOME/tmp"
+  if [ ! -d "$TMP" ]; then mkdir "$TMP"; fi
+fi
+TMP="$(echo "$TMP" | sed -e 's/\/cygdrive\/\(.\)/\1:/')"
+if [ ! -d "$TMP" ]; then 
+  echo "The TMP directory was set as $TMP but cannot be created or found."
+  echo "If there is a file at that location, please move or delete it."
+  exit 1
+fi
+
+##############
+
+# commonly used environment variables...
+
+# TEST_TEMP is a folder where we can generate a collection of junk files.
+export TEST_TEMP="$TMP/testkit_logs_${USER}"
+if [ ! -d "$TEST_TEMP" ]; then
+  mkdir -p "$TEST_TEMP"
+fi
+
+# this variable points to the last output from a grid command.
+export TESTKIT_OUTPUT_FILE="$TEST_TEMP/testkit_output.log"
+export TESTKIT_TIMING_FILE="$TEST_TEMP/testkit_times.log"
+export CONGLOMERATED_TESTKIT_OUTPUT="$TEST_TEMP/full_testkit_output.log"
+
+##############
+
+# uncomment this to enable extra output.
+export DEBUGGING=true
+
+##############
+
+# turn this printout off in non-debugging mode or if the terminal setting
+# seems to indicate that we're running in a login environment (where any
+# echoing to standard out can screw up scp and sftp for that account).
+if [ ! -z "$DEBUGGING" -a -z "$SHOWED_SETTINGS_ALREADY" \
+    -a -z "$BADNESS" -a -z "$SILENT_RUNNING" -a "${TERM}" != "dumb" \
+    -a -z "$PBS_ENVIRONMENT" ]; then
+  echo "==========================================================="
+  echo "Testkit environment loaded."
+  var TESTKIT_ROOT TESTKIT_CFG_FILE TMP TEST_TEMP
+  echo "==========================================================="
+fi
+
+if [ ! -z "$(uname -a | grep -i darwin)" -a -z "$BADNESS" ]; then
+  # add in the mac binaries if this is darwin.
+  export PATH="$TESTKIT_ROOT/bin/macosx:$PATH"
+else
+  # no change, but we want to make sure sub-shells inherit the path.
+  export PATH="$PATH"
+fi
+
+if [ -z "$NO_SUBSHELL" -a -z "$BADNESS" ]; then
+  # at this point we go into a new interactive shell, so as to ensure the
+  # environment parameters stay right.
+  # the self-location code at the top doesn't work properly if this file is
+  # sourced into a current environment.
+  bash
+fi
+
+if [ ! -z "$BADNESS" ]; then
+  echo
+  echo "----"
+  echo "There were errors in setting up the xsede tests--see above messages."
+  unset TESTKIT_SENTINEL TESTKIT_ROOT GRITTY_TESTING_TOP_LEVEL SHUNIT_DIR BADNESS
+else
+  # if things were successful, we can finally set our indicator for the scripts to check.
+  export TESTKIT_SENTINEL=initialized
+fi
+