Merged revisions 78868-78869 via svnmerge from

svn+ssh://pythondev@svn.python.org/python/branches/py3k

................
  r78868 | victor.stinner | 2010-03-12 15:20:59 +0100 (ven., 12 mars 2010) | 25 lines

  Merged revisions 78835-78837 via svnmerge from
  svn+ssh://pythondev@svn.python.org/python/trunk

  ........
    r78835 | victor.stinner | 2010-03-11 13:34:39 +0100 (jeu., 11 mars 2010) | 7 lines

    Issue #7774: Set sys.executable to an empty string if argv[0] has been
    set to an non existent program name and Python is unable to retrieve the real
    program name.

    Fix also sysconfig: if sys.executable is an empty string, use the current
    working directory.
  ........
    r78836 | victor.stinner | 2010-03-11 14:27:35 +0100 (jeu., 11 mars 2010) | 4 lines

    Fix test_executable introduce in previous commit (r78835): Windows is able to
    retrieve the absolute Python path even if argv[0] has been set to a non
    existent program name.
  ........
    r78837 | victor.stinner | 2010-03-11 14:46:06 +0100 (jeu., 11 mars 2010) | 3 lines

    Another fix to test_executable() of test_sys: set the current working to avoid
    the #7774 bug.
  ........
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  r78869 | victor.stinner | 2010-03-12 15:27:16 +0100 (ven., 12 mars 2010) | 2 lines

  Oops, I loose the NEWS change in my previous backport (r78868) of r78835.
................

Lib/test/test_sys.py

@@ -438,6 +438,23 @@ class SysModuleTest(unittest.TestCase):
         out = p.stdout.read().strip()
         self.assertEqual(out, b'?')
 
+    def test_executable(self):
+        # Issue #7774: Ensure that sys.executable is an empty string if argv[0]
+        # has been set to an non existent program name and Python is unable to
+        # retrieve the real program name
+        import subprocess
+        # For a normal installation, it should work without 'cwd'
+        # argument. For test runs in the build directory, see #7774.
+        python_dir = os.path.dirname(os.path.realpath(sys.executable))
+        p = subprocess.Popen(
+            ["nonexistent", "-c",
+             'import sys; print(sys.executable.encode("ascii", "backslashreplace"))'],
+            executable=sys.executable, stdout=subprocess.PIPE, cwd=python_dir)
+        stdout = p.communicate()[0]
+        executable = stdout.strip().decode("ASCII")
+        p.wait()
+        self.assertIn(executable, ["b''", repr(sys.executable.encode("ascii", "backslashreplace"))])
+
 
 class SizeofTest(unittest.TestCase):
 

Misc/NEWS

@@ -135,6 +135,10 @@ Core and Builtins
 Library
 -------
 
+- Issue #7774: Set sys.executable to an empty string if argv[0] has been set to
+  an non existent program name and Python is unable to retrieve the real
+  program name
+
 - Issue #6509: fix re.sub to work properly when the pattern, the string, and
   the replacement were all bytes. Patch by Antoine Pitrou.
 

Modules/getpath.c

@@ -522,7 +522,7 @@ calculate_path(void)
 	}
 	else
 		progpath[0] = '\0';
-	if (progpath[0] != SEP)
+	if (progpath[0] != SEP && progpath[0] != '\0')
 		absolutize(progpath);
 	wcsncpy(argv0_path, progpath, MAXPATHLEN);
 	argv0_path[MAXPATHLEN] = '\0';