1 files changed, 91 insertions, 0 deletions
diff --git a/third_party/libwebrtc/build/symlink.py b/third_party/libwebrtc/build/symlink.py
new file mode 100755
index 0000000000..0f90696a65
--- /dev/null
+++ b/third_party/libwebrtc/build/symlink.py
@@ -0,0 +1,91 @@
+#!/usr/bin/env python
+# Copyright (c) 2013 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.
+
+description = """
+Make a symlink and optionally touch a file (to handle dependencies).
+"""
+usage = "%prog [options] source[ source ...] linkname"
+epilog = """\
+A symlink to source is created at linkname. If multiple sources are specified,
+then linkname is assumed to be a directory, and will contain all the links to
+the sources (basenames identical to their source).
+
+On Windows, this will use hard links (mklink /H) to avoid requiring elevation.
+This means that if the original is deleted and replaced, the link will still
+have the old contents.
+"""
+
+import errno
+import optparse
+import os.path
+import shutil
+import subprocess
+import sys
+
+
+def Main(argv):
+  parser = optparse.OptionParser(usage=usage, description=description,
+                                 epilog=epilog)
+  parser.add_option('-f', '--force', action='store_true')
+  parser.add_option('--touch')
+
+  options, args = parser.parse_args(argv[1:])
+  if len(args) < 2:
+    parser.error('at least two arguments required.')
+
+  target = args[-1]
+  sources = args[:-1]
+  for s in sources:
+    t = os.path.join(target, os.path.basename(s))
+    if len(sources) == 1 and not os.path.isdir(target):
+      t = target
+    t = os.path.expanduser(t)
+    if os.path.realpath(t) == os.path.realpath(s):
+      continue
+    try:
+      # N.B. Python 2.x does not have os.symlink for Windows.
+      #   Python 3 has os.symlink for Windows, but requires either the admin-
+      #   granted privilege SeCreateSymbolicLinkPrivilege or, as of Windows 10
+      #   1703, that Developer Mode be enabled. Hard links and junctions do not
+      #   require any extra privileges to create.
+      if os.name == 'nt':
+        # mklink does not tolerate /-delimited path names.
+        t = t.replace('/', '\\')
+        s = s.replace('/', '\\')
+        # N.B. This tool only handles file hardlinks, not directory junctions.
+        subprocess.check_output(['cmd.exe', '/c', 'mklink', '/H', t, s],
+                                stderr=subprocess.STDOUT)
+      else:
+        os.symlink(s, t)
+    except OSError as e:
+      if e.errno == errno.EEXIST and options.force:
+        if os.path.isdir(t):
+          shutil.rmtree(t, ignore_errors=True)
+        else:
+          os.remove(t)
+        os.symlink(s, t)
+      else:
+        raise
+    except subprocess.CalledProcessError as e:
+      # Since subprocess.check_output does not return an easily checked error
+      # number, in the 'force' case always assume it is 'file already exists'
+      # and retry.
+      if options.force:
+        if os.path.isdir(t):
+          shutil.rmtree(t, ignore_errors=True)
+        else:
+          os.remove(t)
+        subprocess.check_output(e.cmd, stderr=subprocess.STDOUT)
+      else:
+        raise
+
+
+  if options.touch:
+    with open(options.touch, 'w'):
+      pass
+
+
+if __name__ == '__main__':
+  sys.exit(Main(sys.argv))