Check for system shflags

common.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.
 
 # Common constants for build scripts
 # This must evaluate properly for both /bin/bash and /bin/sh
 
 # All scripts should die on error unless commands are specifically excepted
 # by prefixing with '!' or surrounded by 'set +e' / 'set -e'.
 # TODO: Re-enable this once shflags is less prone to dying.
@@ skipping 57 matching lines @@
   set -e
 
   # Read settings
   . $CHROMEOS_DEV_SETTINGS
 
   # Restore previous state of exit-on-error
   eval "$SAVE_OPTS"
 fi
 
 # Load shflags
-. "${SRC_ROOT}/scripts/lib/shflags/shflags"
+if [[ -f /usr/lib/shflags ]]; then
+  . /usr/lib/shflags
+else
+  . "${SRC_ROOT}/scripts/lib/shflags/shflags"
+fi
 
 # Our local mirror
 DEFAULT_CHROMEOS_SERVER=${CHROMEOS_SERVER:-"http://build.chromium.org/mirror"}
 
 # Upstream mirrors and build suites come in 2 flavors
 #   DEV - development chroot, used to build the chromeos image
 #   IMG - bootable image, to run on actual hardware
 
 DEFAULT_DEV_MIRROR=${CHROMEOS_DEV_MIRROR:-"${DEFAULT_CHROMEOS_SERVER}/ubuntu"}
 DEFAULT_DEV_SUITE=${CHROMEOS_DEV_SUITE:-"karmic"}
@@ skipping 356 matching lines @@
 start_time=$(date +%s)
 
 # Print time elsapsed since start_time.
 print_time_elapsed() {
   end_time=$(date +%s)
   elapsed_seconds="$(( $end_time - $start_time ))"
   minutes="$(( $elapsed_seconds / 60 ))"
   seconds="$(( $elapsed_seconds % 60 ))"
   echo "Elapsed time: ${minutes}:${seconds}"
 }