Commits

Victor Stinner  committed 10ecf85 Merge

(merge 3.2) Close #12383: Fix subprocess module with env={}: don't copy the
environment variables, start with an empty environment.

  • Participants
  • Parent commits c819219, b5963fc

Comments (0)

Files changed (3)

File Lib/subprocess.py

                     # potential deadlocks, thus we do all this here.
                     # and pass it to fork_exec()
 
-                    if env:
+                    if env is not None:
                         env_list = [os.fsencode(k) + b'=' + os.fsencode(v)
                                     for k, v in env.items()]
                     else:

File Lib/test/test_subprocess.py

     def test_env(self):
         newenv = os.environ.copy()
         newenv["FRUIT"] = "orange"
-        p = subprocess.Popen([sys.executable, "-c",
-                              'import sys,os;'
-                              'sys.stdout.write(os.getenv("FRUIT"))'],
-                             stdout=subprocess.PIPE,
-                             env=newenv)
-        self.addCleanup(p.stdout.close)
-        self.assertEqual(p.stdout.read(), b"orange")
+        with subprocess.Popen([sys.executable, "-c",
+                               'import sys,os;'
+                               'sys.stdout.write(os.getenv("FRUIT"))'],
+                              stdout=subprocess.PIPE,
+                              env=newenv) as p:
+            stdout, stderr = p.communicate()
+            self.assertEqual(stdout, b"orange")
+
+    def test_empty_env(self):
+        with subprocess.Popen([sys.executable, "-c",
+                               'import os; '
+                               'print(len(os.environ))'],
+                              stdout=subprocess.PIPE,
+                              env={}) as p:
+            stdout, stderr = p.communicate()
+            self.assertEqual(stdout.strip(), b"0")
 
     def test_communicate_stdin(self):
         p = subprocess.Popen([sys.executable, "-c",
 Library
 -------
 
+- Issue #12383: Fix subprocess module with env={}: don't copy the environment
+  variables, start with an empty environment.
+
 - Issue #11637: Fix support for importing packaging setup hooks from the
   project directory.