Update buck

$TMP, $DEPS, $SRCS, $OUT are no longer supplied by Buck in the
environment unless they appear in the command line.  Pass $TMP
where it was assumed to be magically supplied. This allows steps
to continue to use buck-out/gen/ for temporary storage instead of
polluting the system /tmp.

Change-Id: Iea8380e5f93fa16ec77457eb76404832bde93a39

tools/pack_war.py

@@ -15,7 +15,7 @@
 
 from __future__ import print_function
 from optparse import OptionParser
-from os import environ, makedirs, path, symlink
+from os import makedirs, path, symlink
 from subprocess import check_call
 import sys
 from util import check_output
@@ -24,9 +24,10 @@ opts = OptionParser()
 opts.add_option('-o', help='path to write WAR to')
 opts.add_option('--lib', action='append', help='target for WEB-INF/lib')
 opts.add_option('--pgmlib', action='append', help='target for WEB-INF/pgm-lib')
+opts.add_option('--tmp', help='temporary directory')
 args, ctx = opts.parse_args()
 
-war = environ['TMP']
+war = args.tmp
 root = war[:war.index('buck-out')]
 jars = set()
 
@@ -51,4 +52,4 @@ try:
   check_call(['zip', '-9qr', args.o, '.'], cwd = war)
 except KeyboardInterrupt:
   print('Interrupted by user', file=sys.stderr)
-  exit(1)
+  exit(1)