Bug 1437593 - Allow pip requirements to be installed from vendored packages; r=gps

MozReview-Commit-ID: VarZNeeBYy

--HG--
extra : rebase_source : 72a45dd97df763d8efcb8eadf525b43f9365a8e7
extra : source : 4535a1c9225f035dd3e92268ece850c1ebf99ff0

python/mozbuild/mozbuild/virtualenv.py

@@ -488,7 +488,7 @@ class VirtualenvManager(object):
 
         return self._run_pip(args)
 
-    def install_pip_requirements(self, path, require_hashes=True, quiet=False):
+    def install_pip_requirements(self, path, require_hashes=True, quiet=False, vendored=False):
         """Install a pip requirements.txt file.
 
         The supplied path is a text file containing pip requirement
@@ -514,6 +514,12 @@ class VirtualenvManager(object):
         if quiet:
             args.append('--quiet')
 
+        if vendored:
+            args.extend([
+                '--no-deps',
+                '--no-index',
+            ])
+
         return self._run_pip(args)
 
     def _run_pip(self, args):