1 files changed, 74 insertions, 0 deletions
diff --git a/multivenv_experiment/notbuildstream/notbuildstream.py b/multivenv_experiment/notbuildstream/notbuildstream.py
new file mode 100644
index 000000000..cce44d6dd
--- /dev/null
+++ b/multivenv_experiment/notbuildstream/notbuildstream.py
@@ -0,0 +1,74 @@
+import builtins
+import sys
+import contextlib
+
+import click
+
+import pluginbase
+
+
+# TODO: Make this work instead by overriding everything except BuildStream and
+# the standard library.
+@contextlib.contextmanager
+def import_override(*override_modules):
+    def myimport(name, globals_=None, locals_=None, fromlist=None, level=None):
+        # XXX: In the case of 'from . import A, B' we run into trouble if
+        # we remap the name. We should fully understand why and what
+        # guarantees there are before considering using any of this.
+        #
+        # When this is the case, it seems that 'fromlist' will be an empty
+        # list. Again, we need to know the guarantees here.
+        #
+        if fromlist != []:
+            for m in override_modules:
+                if name.startswith(m):
+                    name = "notbuildstream.plugins." + name
+        return builtins_import(name, globals_, locals_, fromlist, level)
+
+    builtins_import = builtins.__import__
+    try:
+        builtins.__import__ = myimport
+        yield
+    finally:
+        builtins.__import__ = builtins_import
+
+
+@click.command("notbuildstream")
+@click.argument(
+    "plugin_venvs",
+    nargs=-1,
+    metavar="PATH",
+    type=click.Path(exists=True, file_okay=False, dir_okay=True),
+)
+def cli(plugin_venvs):
+
+    pbase = pluginbase.PluginBase(package="notbuildstream.plugins")
+    psource_list = []
+
+    for venv in plugin_venvs:
+        print(f"venv: {venv}")
+
+        # XXX: We should determine this path using some standard mechanism.
+        search_path = [venv + "/lib/python3.7/site-packages", venv]
+
+        psource = pbase.make_plugin_source(searchpath=search_path, identifier=venv)
+        psource_list.append(psource)
+
+        with import_override("jinja2", "markupsafe"):
+            with psource:
+                # TODO: use entrypoints and lookup plugins with pkgconfig.
+                plugin = psource.load_plugin("bstplugin")
+                element = plugin.Element("a")
+                jinja2 = psource.load_plugin("jinja2")
+                print(f"main: jinja2: {jinja2}")
+                print(f"main: jinja2.__version__: {jinja2.__version__}")
+                print(f"main: jinja2.__file__: {jinja2.__file__}")
+                print(
+                    "main: Has evalcontextfilter:",
+                    getattr(jinja2, "evalcontextfilter", None),
+                )
+                print()
+
+
+if __name__ == "__main__":
+    sys.exit(cli())