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-rwxr-xr-xthird_party/libwebrtc/build/symlink.py91
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
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+++ 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))