gh-74696: Do not change the current working directory in shutil.make_archive() if possible (GH-93160)

It is no longer changed when create a zip or tar archive.

It is still changed for custom archivers registered with shutil.register_archive_format()
if root_dir is not None.

Co-authored-by: Éric <merwok@netwok.org>
Co-authored-by: Łukasz Langa <lukasz@langa.pl>

1 files changed, 65 insertions, 34 deletions

diff --git a/Lib/shutil.py b/Lib/shutil.py
index 2cbd808..f412864 100644
--- a/Lib/shutil.py
+++ b/Lib/shutil.py
@@ -897,7 +897,7 @@ def _get_uid(name):
     return None
 
 def _make_tarball(base_name, base_dir, compress="gzip", verbose=0, dry_run=0,
-                  owner=None, group=None, logger=None):
+                  owner=None, group=None, logger=None, root_dir=None):
     """Create a (possibly compressed) tar file from all the files under
     'base_dir'.
 
@@ -954,14 +954,20 @@ def _make_tarball(base_name, base_dir, compress="gzip", verbose=0, dry_run=0,
 
     if not dry_run:
         tar = tarfile.open(archive_name, 'w|%s' % tar_compression)
+        arcname = base_dir
+        if root_dir is not None:
+            base_dir = os.path.join(root_dir, base_dir)
         try:
-            tar.add(base_dir, filter=_set_uid_gid)
+            tar.add(base_dir, arcname, filter=_set_uid_gid)
         finally:
             tar.close()
 
+    if root_dir is not None:
+        archive_name = os.path.abspath(archive_name)
     return archive_name
 
-def _make_zipfile(base_name, base_dir, verbose=0, dry_run=0, logger=None):
+def _make_zipfile(base_name, base_dir, verbose=0, dry_run=0,
+                  logger=None, owner=None, group=None, root_dir=None):
     """Create a zip file from all the files under 'base_dir'.
 
     The output zip file will be named 'base_name' + ".zip".  Returns the
@@ -985,42 +991,60 @@ def _make_zipfile(base_name, base_dir, verbose=0, dry_run=0, logger=None):
     if not dry_run:
         with zipfile.ZipFile(zip_filename, "w",
                              compression=zipfile.ZIP_DEFLATED) as zf:
-            path = os.path.normpath(base_dir)
-            if path != os.curdir:
-                zf.write(path, path)
+            arcname = os.path.normpath(base_dir)
+            if root_dir is not None:
+                base_dir = os.path.join(root_dir, base_dir)
+            base_dir = os.path.normpath(base_dir)
+            if arcname != os.curdir:
+                zf.write(base_dir, arcname)
                 if logger is not None:
-                    logger.info("adding '%s'", path)
+                    logger.info("adding '%s'", base_dir)
             for dirpath, dirnames, filenames in os.walk(base_dir):
+                arcdirpath = dirpath
+                if root_dir is not None:
+                    arcdirpath = os.path.relpath(arcdirpath, root_dir)
+                arcdirpath = os.path.normpath(arcdirpath)
                 for name in sorted(dirnames):
-                    path = os.path.normpath(os.path.join(dirpath, name))
-                    zf.write(path, path)
+                    path = os.path.join(dirpath, name)
+                    arcname = os.path.join(arcdirpath, name)
+                    zf.write(path, arcname)
                     if logger is not None:
                         logger.info("adding '%s'", path)
                 for name in filenames:
-                    path = os.path.normpath(os.path.join(dirpath, name))
+                    path = os.path.join(dirpath, name)
+                    path = os.path.normpath(path)
                     if os.path.isfile(path):
-                        zf.write(path, path)
+                        arcname = os.path.join(arcdirpath, name)
+                        zf.write(path, arcname)
                         if logger is not None:
                             logger.info("adding '%s'", path)
 
+    if root_dir is not None:
+        zip_filename = os.path.abspath(zip_filename)
     return zip_filename
 
+# Maps the name of the archive format to a tuple containing:
+# * the archiving function
+# * extra keyword arguments
+# * description
+# * does it support the root_dir argument?
 _ARCHIVE_FORMATS = {
-    'tar':   (_make_tarball, [('compress', None)], "uncompressed tar file"),
+    'tar':   (_make_tarball, [('compress', None)],
+              "uncompressed tar file", True),
 }
 
 if _ZLIB_SUPPORTED:
     _ARCHIVE_FORMATS['gztar'] = (_make_tarball, [('compress', 'gzip')],
-                                "gzip'ed tar-file")
-    _ARCHIVE_FORMATS['zip'] = (_make_zipfile, [], "ZIP file")
+                                "gzip'ed tar-file", True)
+    _ARCHIVE_FORMATS['zip'] = (_make_zipfile, [], "ZIP file", True)
 
 if _BZ2_SUPPORTED:
     _ARCHIVE_FORMATS['bztar'] = (_make_tarball, [('compress', 'bzip2')],
-                                "bzip2'ed tar-file")
+                                "bzip2'ed tar-file", True)
 
 if _LZMA_SUPPORTED:
     _ARCHIVE_FORMATS['xztar'] = (_make_tarball, [('compress', 'xz')],
-                                "xz'ed tar-file")
+                                "xz'ed tar-file", True)
 
 def get_archive_formats():
     """Returns a list of supported formats for archiving and unarchiving.
@@ -1051,7 +1075,7 @@ def register_archive_format(name, function, extra_args=None, description=''):
         if not isinstance(element, (tuple, list)) or len(element) !=2:
             raise TypeError('extra_args elements are : (arg_name, value)')
 
-    _ARCHIVE_FORMATS[name] = (function, extra_args, description)
+    _ARCHIVE_FORMATS[name] = (function, extra_args, description, False)
 
 def unregister_archive_format(name):
     del _ARCHIVE_FORMATS[name]
@@ -1075,36 +1099,38 @@ def make_archive(base_name, format, root_dir=None, base_dir=None, verbose=0,
     uses the current owner and group.
     """
     sys.audit("shutil.make_archive", base_name, format, root_dir, base_dir)
-    save_cwd = os.getcwd()
-    if root_dir is not None:
-        if logger is not None:
-            logger.debug("changing into '%s'", root_dir)
-        base_name = os.path.abspath(base_name)
-        if not dry_run:
-            os.chdir(root_dir)
-
-    if base_dir is None:
-        base_dir = os.curdir
-
-    kwargs = {'dry_run': dry_run, 'logger': logger}
-
     try:
         format_info = _ARCHIVE_FORMATS[format]
     except KeyError:
         raise ValueError("unknown archive format '%s'" % format) from None
 
+    kwargs = {'dry_run': dry_run, 'logger': logger,
+              'owner': owner, 'group': group}
+
     func = format_info[0]
     for arg, val in format_info[1]:
         kwargs[arg] = val
 
-    if format != 'zip':
-        kwargs['owner'] = owner
-        kwargs['group'] = group
+    if base_dir is None:
+        base_dir = os.curdir
+
+    support_root_dir = format_info[3]
+    save_cwd = None
+    if root_dir is not None:
+        if support_root_dir:
+            kwargs['root_dir'] = root_dir
+        else:
+            save_cwd = os.getcwd()
+            if logger is not None:
+                logger.debug("changing into '%s'", root_dir)
+            base_name = os.path.abspath(base_name)
+            if not dry_run:
+                os.chdir(root_dir)
 
     try:
         filename = func(base_name, base_dir, **kwargs)
     finally:
-        if root_dir is not None:
+        if save_cwd is not None:
             if logger is not None:
                 logger.debug("changing back to '%s'", save_cwd)
             os.chdir(save_cwd)
@@ -1217,6 +1243,11 @@ def _unpack_tarfile(filename, extract_dir):
     finally:
         tarobj.close()
 
+# Maps the name of the unpack format to a tuple containing:
+# * extensions
+# * the unpacking function
+# * extra keyword arguments
+# * description
 _UNPACK_FORMATS = {
     'tar':   (['.tar'], _unpack_tarfile, [], "uncompressed tar file"),
     'zip':   (['.zip'], _unpack_zipfile, [], "ZIP file"),