Adding Dummy sandbox and nolocal platform

buildstream/_platform/darwin.py

@@ -19,7 +19,7 @@ import os
 import resource
 
 from .._exceptions import PlatformError
-from ..sandbox import SandboxChroot
+from ..sandbox import SandboxChroot, DummySandbox
 
 from . import Platform
 
@@ -38,7 +38,10 @@ class Darwin(Platform):
         return self._artifact_cache
 
     def create_sandbox(self, *args, **kwargs):
-        return SandboxChroot(*args, **kwargs)
+        if os.path.exists('/dev/fuse'):
+            return SandboxChroot(*args, **kwargs)
+        else:
+            DummySandbox().run()
 
     def get_cpu_count(self, cap=None):
         if cap < os.cpu_count():

buildstream/_platform/linux.py

@@ -24,7 +24,7 @@ from .. import _site
 from .. import utils
 from .._artifactcache.cascache import CASCache
 from .._message import Message, MessageType
-from ..sandbox import SandboxBwrap
+from ..sandbox import SandboxBwrap, DummySandbox
 
 from . import Platform
 
@@ -48,10 +48,13 @@ class Linux(Platform):
         return self._artifact_cache
 
     def create_sandbox(self, *args, **kwargs):
-        # Inform the bubblewrap sandbox as to whether it can use user namespaces or not
-        kwargs['user_ns_available'] = self._user_ns_available
-        kwargs['die_with_parent_available'] = self._die_with_parent_available
-        return SandboxBwrap(*args, **kwargs)
+        if not (os.path.exists(utils.get_host_tool('bwrap')) and os.path.exists('/dev/fuse')):
+            DummySandbox.run()
+        else:
+            # Inform the bubblewrap sandbox as to whether it can use user namespaces or not
+            kwargs['user_ns_available'] = self._user_ns_available
+            kwargs['die_with_parent_available'] = self._die_with_parent_available
+            return SandboxBwrap(*args, **kwargs)
 
     ################################################
     #              Private Methods                 #

buildstream/_platform/platform.py

@@ -54,6 +54,8 @@ class Platform():
             backend = 'linux'
         elif sys.platform.startswith('darwin'):
             backend = 'darwin'
+        elif not (os.path.exists(utils.get_host_tool('bwrap')) and os.path.exists('/dev/fuse')):
+            backend = 'no_local'
         else:
             backend = 'unix'
 
@@ -63,6 +65,8 @@ class Platform():
             from .darwin import Darwin as PlatformImpl
         elif backend == 'unix':
             from .unix import Unix as PlatformImpl
+        elif backend == 'no_local':
+            from .nolocal import Nolocal as PlatformImpl
         else:
             raise PlatformError("No such platform: '{}'".format(backend))
 

buildstream/sandbox/__init__.py

@@ -21,3 +21,4 @@ from .sandbox import Sandbox, SandboxFlags
 from ._sandboxchroot import SandboxChroot
 from ._sandboxbwrap import SandboxBwrap
 from ._sandboxremote import SandboxRemote
+from ._dummysandbox import DummySandbox

buildstream/sandbox/_dummysandbox.py

+#
+#  Copyright (C) 2018 Codethink Limited
+#  Copyright (C) 2018 Bloomberg Finance LP
+#
+#  This program is free software; you can redistribute it and/or
+#  modify it under the terms of the GNU Lesser General Public
+#  License as published by the Free Software Foundation; either
+#  version 2 of the License, or (at your option) any later version.
+#
+#  This library is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the GNU
+#  Lesser General Public License for more details.
+#
+#  You should have received a copy of the GNU Lesser General Public
+#  License along with this library. If not, see <http://www.gnu.org/licenses/>.
+
+from .._exceptions import SandboxError
+
+
+class DummySandbox():
+    def run(self):
+        raise SandboxError("Sandboxes are not supported on this platform")