bpo-22831: Use "with" to avoid possible fd leaks in distutils. (GH-10921)

Lib/distutils/archive_util.py

@@ -166,21 +166,21 @@ def make_zipfile(base_name, base_dir, verbose=0, dry_run=0):
                 zip = zipfile.ZipFile(zip_filename, "w",
                                       compression=zipfile.ZIP_STORED)
 
-            if base_dir != os.curdir:
-                path = os.path.normpath(os.path.join(base_dir, ''))
-                zip.write(path, path)
-                log.info("adding '%s'", path)
-            for dirpath, dirnames, filenames in os.walk(base_dir):
-                for name in dirnames:
-                    path = os.path.normpath(os.path.join(dirpath, name, ''))
+            with zip:
+                if base_dir != os.curdir:
+                    path = os.path.normpath(os.path.join(base_dir, ''))
                     zip.write(path, path)
                     log.info("adding '%s'", path)
-                for name in filenames:
-                    path = os.path.normpath(os.path.join(dirpath, name))
-                    if os.path.isfile(path):
+                for dirpath, dirnames, filenames in os.walk(base_dir):
+                    for name in dirnames:
+                        path = os.path.normpath(os.path.join(dirpath, name, ''))
                         zip.write(path, path)
                         log.info("adding '%s'", path)
-            zip.close()
+                    for name in filenames:
+                        path = os.path.normpath(os.path.join(dirpath, name))
+                        if os.path.isfile(path):
+                            zip.write(path, path)
+                            log.info("adding '%s'", path)
 
     return zip_filename
 

Lib/distutils/command/bdist_msi.py

@@ -390,18 +390,18 @@ class bdist_msi(Command):
         #     entries for each version as the above code does
         if self.pre_install_script:
             scriptfn = os.path.join(self.bdist_dir, "preinstall.bat")
-            f = open(scriptfn, "w")
-            # The batch file will be executed with [PYTHON], so that %1
-            # is the path to the Python interpreter; %0 will be the path
-            # of the batch file.
-            # rem ="""
-            # %1 %0
-            # exit
-            # """
-            # <actual script>
-            f.write('rem ="""\n%1 %0\nexit\n"""\n')
-            f.write(open(self.pre_install_script).read())
-            f.close()
+            with open(scriptfn, "w") as f:
+                # The batch file will be executed with [PYTHON], so that %1
+                # is the path to the Python interpreter; %0 will be the path
+                # of the batch file.
+                # rem ="""
+                # %1 %0
+                # exit
+                # """
+                # <actual script>
+                f.write('rem ="""\n%1 %0\nexit\n"""\n')
+                with open(self.pre_install_script) as fin:
+                    f.write(fin.read())
             add_data(self.db, "Binary",
                 [("PreInstall", msilib.Binary(scriptfn))
                 ])

Lib/distutils/command/config.py

@@ -106,15 +106,14 @@ class config(Command):
 
     def _gen_temp_sourcefile(self, body, headers, lang):
         filename = "_configtest" + LANG_EXT[lang]
-        file = open(filename, "w")
-        if headers:
-            for header in headers:
-                file.write("#include <%s>\n" % header)
-            file.write("\n")
-        file.write(body)
-        if body[-1] != "\n":
-            file.write("\n")
-        file.close()
+        with open(filename, "w") as file:
+            if headers:
+                for header in headers:
+                    file.write("#include <%s>\n" % header)
+                file.write("\n")
+            file.write(body)
+            if body[-1] != "\n":
+                file.write("\n")
         return filename
 
     def _preprocess(self, body, headers, include_dirs, lang):
@@ -203,17 +202,16 @@ class config(Command):
         if isinstance(pattern, str):
             pattern = re.compile(pattern)
 
-        file = open(out)
-        match = False
-        while True:
-            line = file.readline()
-            if line == '':
-                break
-            if pattern.search(line):
-                match = True
-                break
+        with open(out) as file:
+            match = False
+            while True:
+                line = file.readline()
+                if line == '':
+                    break
+                if pattern.search(line):
+                    match = True
+                    break
 
-        file.close()
         self._clean()
         return match
 

Lib/distutils/command/sdist.py

@@ -407,14 +407,13 @@ class sdist(Command):
         distribution.
         """
         log.info("reading manifest file '%s'", self.manifest)
-        manifest = open(self.manifest)
-        for line in manifest:
-            # ignore comments and blank lines
-            line = line.strip()
-            if line.startswith('#') or not line:
-                continue
-            self.filelist.append(line)
-        manifest.close()
+        with open(self.manifest) as manifest:
+            for line in manifest:
+                # ignore comments and blank lines
+                line = line.strip()
+                if line.startswith('#') or not line:
+                    continue
+                self.filelist.append(line)
 
     def make_release_tree(self, base_dir, files):
         """Create the directory tree that will become the source

Lib/distutils/util.py

@@ -378,35 +378,34 @@ def byte_compile (py_files,
             else:
                 script = open(script_name, "w")
 
-            script.write("""\
+            with script:
+                script.write("""\
 from distutils.util import byte_compile
 files = [
 """)
 
-            # XXX would be nice to write absolute filenames, just for
-            # safety's sake (script should be more robust in the face of
-            # chdir'ing before running it).  But this requires abspath'ing
-            # 'prefix' as well, and that breaks the hack in build_lib's
-            # 'byte_compile()' method that carefully tacks on a trailing
-            # slash (os.sep really) to make sure the prefix here is "just
-            # right".  This whole prefix business is rather delicate -- the
-            # problem is that it's really a directory, but I'm treating it
-            # as a dumb string, so trailing slashes and so forth matter.
-
-            #py_files = map(os.path.abspath, py_files)
-            #if prefix:
-            #    prefix = os.path.abspath(prefix)
-
-            script.write(",\n".join(map(repr, py_files)) + "]\n")
-            script.write("""
+                # XXX would be nice to write absolute filenames, just for
+                # safety's sake (script should be more robust in the face of
+                # chdir'ing before running it).  But this requires abspath'ing
+                # 'prefix' as well, and that breaks the hack in build_lib's
+                # 'byte_compile()' method that carefully tacks on a trailing
+                # slash (os.sep really) to make sure the prefix here is "just
+                # right".  This whole prefix business is rather delicate -- the
+                # problem is that it's really a directory, but I'm treating it
+                # as a dumb string, so trailing slashes and so forth matter.
+
+                #py_files = map(os.path.abspath, py_files)
+                #if prefix:
+                #    prefix = os.path.abspath(prefix)
+
+                script.write(",\n".join(map(repr, py_files)) + "]\n")
+                script.write("""
 byte_compile(files, optimize=%r, force=%r,
              prefix=%r, base_dir=%r,
              verbose=%r, dry_run=0,
              direct=1)
 """ % (optimize, force, prefix, base_dir, verbose))
 
-            script.close()
-
         cmd = [sys.executable]
         cmd.extend(subprocess._optim_args_from_interpreter_flags())
         cmd.append(script_name)