bpo-46933: Make pwd module optional (GH-31700)

.gitignore

@@ -75,6 +75,7 @@ Mac/pythonw
 Misc/python.pc
 Misc/python-embed.pc
 Misc/python-config.sh
+Modules/Setup.bootstrap
 Modules/Setup.config
 Modules/Setup.local
 Modules/Setup.stdlib

Lib/distutils/tests/test_util.py

@@ -248,7 +248,10 @@ def test_check_environ_getpwuid(self):
         util._environ_checked = 0
         os.environ.pop('HOME', None)
 
-        import pwd
+        try:
+            import pwd
+        except ImportError:
+            raise unittest.SkipTest("Test requires pwd module.")
 
         # only set pw_dir field, other fields are not used
         result = pwd.struct_passwd((None, None, None, None, None,

Lib/posixpath.py

@@ -241,7 +241,11 @@ def expanduser(path):
         i = len(path)
     if i == 1:
         if 'HOME' not in os.environ:
-            import pwd
+            try:
+                import pwd
+            except ImportError:
+                # pwd module unavailable, return path unchanged
+                return path
             try:
                 userhome = pwd.getpwuid(os.getuid()).pw_dir
             except KeyError:
@@ -251,7 +255,11 @@ def expanduser(path):
         else:
             userhome = os.environ['HOME']
     else:
-        import pwd
+        try:
+            import pwd
+        except ImportError:
+            # pwd module unavailable, return path unchanged
+            return path
         name = path[1:i]
         if isinstance(name, bytes):
             name = str(name, 'ASCII')

Lib/test/test_pathlib.py

@@ -1486,6 +1486,9 @@ def _test_home(self, p):
         self.assertIs(type(p), type(q))
         self.assertTrue(p.is_absolute())
 
+    @unittest.skipIf(
+        pwd is None, reason="Test requires pwd module to get homedir."
+    )
     def test_home(self):
         with os_helper.EnvironmentVarGuard() as env:
             self._test_home(self.cls.home())

Lib/test/test_posix.py

@@ -15,14 +15,18 @@
 import time
 import os
 import platform
-import pwd
 import stat
 import tempfile
 import unittest
 import warnings
 import textwrap
 from contextlib import contextmanager
 
+try:
+    import pwd
+except ImportError:
+    pwd = None
+
 _DUMMY_SYMLINK = os.path.join(tempfile.gettempdir(),
                               os_helper.TESTFN + '-dummy-symlink')
 
@@ -126,6 +130,7 @@ def test_setresgid_exception(self):
 
     @unittest.skipUnless(hasattr(posix, 'initgroups'),
                          "test needs os.initgroups()")
+    @unittest.skipUnless(hasattr(pwd, 'getpwuid'), "test needs pwd.getpwuid()")
     def test_initgroups(self):
         # It takes a string and an integer; check that it raises a TypeError
         # for other argument lists.

Makefile.pre.in

@@ -917,6 +917,9 @@ Modules/Setup.local:
 	@# Create empty Setup.local when file was deleted by user
 	echo "# Edit this file for local setup changes" > $@
 
+Modules/Setup.bootstrap: $(srcdir)/Modules/Setup.bootstrap.in config.status
+	./config.status $@
+
 Modules/Setup.stdlib: $(srcdir)/Modules/Setup.stdlib.in config.status
 	./config.status $@
 
@@ -925,13 +928,13 @@ Makefile Modules/config.c: Makefile.pre \
 				$(MAKESETUP) \
 				$(srcdir)/Modules/Setup \
 				Modules/Setup.local \
-				$(srcdir)/Modules/Setup.bootstrap \
+				Modules/Setup.bootstrap \
 				Modules/Setup.stdlib
 	$(SHELL) $(MAKESETUP) -c $(srcdir)/Modules/config.c.in \
 				-s Modules \
 				Modules/Setup.local \
 				@MODULES_SETUP_STDLIB@ \
-				$(srcdir)/Modules/Setup.bootstrap \
+				Modules/Setup.bootstrap \
 				$(srcdir)/Modules/Setup
 	@mv config.c Modules
 	@echo "The Makefile was updated, you may need to re-run make."
@@ -2146,7 +2149,7 @@ libainstall:	@DEF_MAKE_RULE@ python-config
 	$(INSTALL_DATA) $(srcdir)/Modules/config.c.in $(DESTDIR)$(LIBPL)/config.c.in
 	$(INSTALL_DATA) Makefile $(DESTDIR)$(LIBPL)/Makefile
 	$(INSTALL_DATA) $(srcdir)/Modules/Setup $(DESTDIR)$(LIBPL)/Setup
-	$(INSTALL_DATA) $(srcdir)/Modules/Setup.bootstrap $(DESTDIR)$(LIBPL)/Setup.bootstrap
+	$(INSTALL_DATA) Modules/Setup.bootstrap $(DESTDIR)$(LIBPL)/Setup.bootstrap
 	$(INSTALL_DATA) Modules/Setup.stdlib $(DESTDIR)$(LIBPL)/Setup.stdlib
 	$(INSTALL_DATA) Modules/Setup.local $(DESTDIR)$(LIBPL)/Setup.local
 	$(INSTALL_DATA) Misc/python.pc $(DESTDIR)$(LIBPC)/python-$(VERSION).pc
@@ -2381,8 +2384,9 @@ distclean: clobber
 	for file in $(srcdir)/Lib/test/data/* ; do \
 	    if test "$$file" != "$(srcdir)/Lib/test/data/README"; then rm "$$file"; fi; \
 	done
-	-rm -f core Makefile Makefile.pre config.status Modules/Setup.local \
-		Modules/Setup.stdlib Modules/ld_so_aix Modules/python.exp Misc/python.pc \
+	-rm -f core Makefile Makefile.pre config.status Modules/Setup.local
+	    Modules/Setup.bootstrap Modules/Setup.stdlib \
+		Modules/ld_so_aix Modules/python.exp Misc/python.pc \
 		Misc/python-embed.pc Misc/python-config.sh
 	-rm -f python*-gdb.py
 	# Issue #28258: set LC_ALL to avoid issues with Estonian locale.

Misc/NEWS.d/next/Library/2022-03-05-21-51-31.bpo-46933.6yzWtb.rst

@@ -0,0 +1 @@
+The :mod:`pwd` module is now optional. :func:`os.path.expanduser` returns the path when the :mod:`pwd` module is not available.

Modules/Setup.bootstrap → Modules/Setup.bootstrap.in

@@ -32,4 +32,4 @@ _stat _stat.c
 _symtable symtablemodule.c
 
 # for systems without $HOME env, used by site._getuserbase()
-pwd pwdmodule.c
+@MODULE_PWD_TRUE@pwd pwdmodule.c