gclient: kill git fetch operation that hangs.

gclient_scm.py

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Gclient-specific SCM-specific operations."""
 
 from __future__ import print_function
 
 import errno
 import logging
@@ skipping 1181 matching lines @@
       quiet = (not options.verbose)
     checkout_args = ['checkout']
     if force:
       checkout_args.append('--force')
     if quiet:
       checkout_args.append('--quiet')
     checkout_args.append(ref)
     return self._Capture(checkout_args)
 
   def _Fetch(self, options, remote=None, prune=False, quiet=False):
+    kill_timeout = float(os.getenv('GCLIENT_KILL_GIT_FETCH_AFTER', 0))
     cfg = gclient_utils.DefaultIndexPackConfig(self.url)
     fetch_cmd =  cfg + [
         'fetch',
         remote or self.remote,
     ]
 
     if prune:
       fetch_cmd.append('--prune')
     if options.verbose:
       fetch_cmd.append('--verbose')
     elif quiet:
       fetch_cmd.append('--quiet')
-    self._Run(fetch_cmd, options, show_header=options.verbose, retry=True)
+    self._Run(fetch_cmd, options, show_header=options.verbose, retry=True,
+              kill_timeout=kill_timeout)
 
     # Return the revision that was fetched; this will be stored in 'FETCH_HEAD'
     return self._Capture(['rev-parse', '--verify', 'FETCH_HEAD'])
 
   def _UpdateBranchHeads(self, options, fetch=False):
     """Adds, and optionally fetches, "branch-heads" and "tags" refspecs
     if requested."""
     need_fetch = fetch
     if hasattr(options, 'with_branch_heads') and options.with_branch_heads:
       config_cmd = ['config', 'remote.%s.fetch' % self.remote,
@@ skipping 502 matching lines @@
       new_command.append('--force')
       if command[0] != 'checkout' and scm.SVN.AssertVersion('1.6')[0]:
         new_command.extend(('--accept', 'theirs-conflict'))
     elif options.manually_grab_svn_rev:
       new_command.append('--force')
       if command[0] != 'checkout' and scm.SVN.AssertVersion('1.6')[0]:
         new_command.extend(('--accept', 'postpone'))
     elif command[0] != 'checkout' and scm.SVN.AssertVersion('1.6')[0]:
       new_command.extend(('--accept', 'postpone'))
     return new_command