Create a temporary dir for patch to do its work.

BUG=259665

Review URL: https://chromiumcodereview.appspot.com/18664004

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@211443 0039d316-1c4b-4281-b951-d872f2087c98

checkout.py

@@ -204,13 +204,19 @@ class RawCheckout(CheckoutBase):
               cmd = ['patch', '-u', '--binary', '-p%s' % p.patchlevel]
               if verbose:
                 cmd.append('--verbose')
+              env = os.environ.copy()
+              env['TMPDIR'] = tempfile.mkdtemp(prefix='crpatch')
+              try:
                 stdout.append(
                     subprocess2.check_output(
                         cmd,
                         stdin=p.get(False),
                         stderr=subprocess2.STDOUT,
                         cwd=self.project_path,
-                      timeout=GLOBAL_TIMEOUT))
+                        timeout=GLOBAL_TIMEOUT,
+                        env=env))
+              finally:
+                shutil.rmtree(env['TMPDIR'])
             elif p.is_new and not os.path.exists(filepath):
               # There is only a header. Just create the file.
               open(filepath, 'w').close()
@@ -400,12 +406,19 @@ class SvnCheckout(CheckoutBase, SvnMixIn):
                 '--force',
                 '--no-backup-if-mismatch',
               ]
+              env = os.environ.copy()
+              env['TMPDIR'] = tempfile.mkdtemp(prefix='crpatch')
+              try:
                 stdout.append(
                     subprocess2.check_output(
                       cmd,
                       stdin=p.get(False),
                       cwd=self.project_path,
-                    timeout=GLOBAL_TIMEOUT))
+                      timeout=GLOBAL_TIMEOUT,
+                      env=env))
+              finally:
+                shutil.rmtree(env['TMPDIR'])
+
             elif p.is_new and not os.path.exists(filepath):
               # There is only a header. Just create the file if it doesn't
               # exist.