Make --deps-path=- put the temp dir in the real temp folder.

recipes.py

 #!/usr/bin/env python
 # Copyright 2015 The LUCI Authors. All rights reserved.
 # Use of this source code is governed under the Apache License, Version 2.0
 # that can be found in the LICENSE file.
 
 """Tool to interact with recipe repositories.
 
 This tool operates on the nearest ancestor directory containing an
 infra/config/recipes.cfg.
 """
@@ skipping 559 matching lines @@
 
   # If we're using a temporary deps directory, create it.
   temp_deps_dir = None
   try:
     # When bootstrapping, re-use the calling wrapper's deps directory instead of
     # creating a new one.
     args.deps_path = os.environ.pop('RECIPES_RUN_BOOTSTRAP_DEPS_DIR',
                                     args.deps_path)
     if args.deps_path == '-':
       # "-" means use a temporary deps path.
-      temp_deps_dir = tempfile.mkdtemp(dir=ROOT_DIR, suffix='_deps')
+      temp_deps_dir = tempfile.mkdtemp(suffix='_recipe_deps')
       args.deps_path = temp_deps_dir
 
     if args.deps_path:
       logging.warning('(Not Bad) Using custom deps path: %s', args.deps_path)
 
     # If we're bootstrapping, construct our bootstrap environment. If we're
     # using a custom deps path, install our enviornment there too.
     if args.use_bootstrap and not os.environ.pop('RECIPES_RUN_BOOTSTRAP', None):
       # Propagate our deps path, if specified, so we re-use our temporary
       # directory.
@@ skipping 119 matching lines @@
 
   if not isinstance(ret, int):
     if ret is None:
       ret = 0
     else:
       print >> sys.stderr, ret
       ret = 1
   sys.stdout.flush()
   sys.stderr.flush()
   os._exit(ret)