Use bpy.app.binary_path_python as subprocess interpreter

package_manager/__init__.py

@@ -44,6 +44,10 @@ else:
 
 import bpy
 from collections import OrderedDict
+import multiprocessing
+
+mp_context = multiprocessing.get_context()
+mp_context.set_executable(bpy.app.binary_path_python)
 
 # global list of all known packages, indexed by name
 _packages = OrderedDict()
@@ -129,9 +133,8 @@ class SubprocMixin:
         self._state = 'QUIT'
 
     def invoke(self, context, event):
-        import multiprocessing
 
-        self.pipe_blender, self.pipe_subproc = multiprocessing.Pipe()
+        self.pipe_blender, self.pipe_subproc = mp_context.Pipe()
 
         # The subprocess should just be terminated when Blender quits. Without this,
         # Blender would hang while closing, until the subprocess terminates itself.
@@ -183,14 +186,13 @@ class SubprocMixin:
     def abort(self):
         import time
 
-        # Allow the subprocess 10 seconds to repsond to our abort message.
+        # Allow the subprocess 10 seconds to respond to our abort message.
         self._abort_timeout = time.time() + 10
         self._state = 'ABORTING'
 
         self.pipe_blender.send(messages.Abort())
 
     def _finish(self, context):
-        import multiprocessing
         try:
             self.cancel(context)
         except AttributeError:
@@ -268,7 +270,6 @@ class PACKAGE_OT_install(SubprocMixin, bpy.types.Operator):
         :rtype: multiprocessing.Process
         """
 
-        import multiprocessing
 
         self.msg_handlers = {
             messages.Progress: self._subproc_progress,
@@ -289,7 +290,7 @@ class PACKAGE_OT_install(SubprocMixin, bpy.types.Operator):
         self.log.debug("Using %s as install path", install_path)
 
         import addon_utils
-        proc = multiprocessing.Process(target=subproc.download_and_install_package,
+        proc = mp_context.Process(target=subproc.download_and_install_package,
                                        args=(self.pipe_subproc, package, install_path))
         return proc
 
@@ -356,7 +357,7 @@ class PACKAGE_OT_uninstall(SubprocMixin, bpy.types.Operator):
         global _packages
         package = _packages[self.package_name].get_latest_version()
 
-        proc = multiprocessing.Process(target=subproc.uninstall_package,
+        proc = mp_context.Process(target=subproc.uninstall_package,
                                        args=(self.pipe_subproc, package, install_path))
         return proc
 
@@ -465,7 +466,7 @@ class PACKAGE_OT_refresh_repositories(SubprocMixin, bpy.types.Operator):
         storage_path = pathlib.Path(bpy.utils.user_resource('CONFIG', 'packages', create=True))
         repository_url = self.repolist[0].url
 
-        proc = multiprocessing.Process(target=subproc.refresh_repository,
+        proc = mp_context.Process(target=subproc.refresh_repository,
                                        args=(self.pipe_subproc, storage_path, repository_url))
         return proc