gh-130379: Fix incorrect zipapp logic to avoid including the target in itself (gh...

diff --git a/Lib/test/test_zipapp.py b/Lib/test/test_zipapp.py
index 00a5ed6626ddc55d036ab948febe1b85de071a7e..ad132839622f487242759a77386a7f7f3918320b 100644 (file)
--- a/Lib/test/test_zipapp.py
+++ b/Lib/test/test_zipapp.py
@@ -89,6 +89,30 @@ class ZipAppTest(unittest.TestCase):
             self.assertIn('test.py', z.namelist())
             self.assertNotIn('test.pyc', z.namelist())
 
+    def test_create_archive_self_insertion(self):
+        # When creating an archive, we shouldn't
+        # include the archive in the list of files to add.
+        source = self.tmpdir
+        (source / '__main__.py').touch()
+        (source / 'test.py').touch()
+        target = self.tmpdir / 'target.pyz'
+
+        zipapp.create_archive(source, target)
+        with zipfile.ZipFile(target, 'r') as z:
+            self.assertEqual(len(z.namelist()), 2)
+            self.assertIn('__main__.py', z.namelist())
+            self.assertIn('test.py', z.namelist())
+
+    def test_target_overwrites_source_file(self):
+        # The target cannot be one of the files to add.
+        source = self.tmpdir
+        (source / '__main__.py').touch()
+        target = source / 'target.pyz'
+        target.touch()
+
+        with self.assertRaises(zipapp.ZipAppError):
+            zipapp.create_archive(source, target)
+
     def test_create_archive_filter_exclude_dir(self):
         # Test packing a directory and using a filter to exclude a
         # subdirectory (ensures that the path supplied to include

diff --git a/Lib/zipapp.py b/Lib/zipapp.py
index 03a214efa10a20dcf1a54b611a0b83abb79b4265..4ffacc49fa753dc04410ecd44a0f7d1a5916dabf 100644 (file)
--- a/Lib/zipapp.py
+++ b/Lib/zipapp.py
@@ -131,14 +131,37 @@ def create_archive(source, target=None, interpreter=None, main=None,
     elif not hasattr(target, 'write'):
         target = pathlib.Path(target)
 
+    # Create the list of files to add to the archive now, in case
+    # the target is being created in the source directory - we
+    # don't want the target being added to itself
+    files_to_add = sorted(source.rglob('*'))
+
+    # The target cannot be in the list of files to add. If it were, we'd
+    # end up overwriting the source file and writing the archive into
+    # itself, which is an error. We therefore check for that case and
+    # provide a helpful message for the user.
+
+    # Note that we only do a simple path equality check. This won't
+    # catch every case, but it will catch the common case where the
+    # source is the CWD and the target is a file in the CWD. More
+    # thorough checks don't provide enough value to justify the extra
+    # cost.
+
+    # If target is a file-like object, it will simply fail to compare
+    # equal to any of the entries in files_to_add, so there's no need
+    # to add a special check for that.
+    if target in files_to_add:
+        raise ZipAppError(
+            f"The target archive {target} overwrites one of the source files.")
+
     with _maybe_open(target, 'wb') as fd:
         _write_file_prefix(fd, interpreter)
         compression = (zipfile.ZIP_DEFLATED if compressed else
                        zipfile.ZIP_STORED)
         with zipfile.ZipFile(fd, 'w', compression=compression) as z:
-            for child in sorted(source.rglob('*')):
+            for child in files_to_add:
                 arcname = child.relative_to(source)
-                if filter is None or filter(arcname) and child.resolve() != arcname.resolve():
+                if filter is None or filter(arcname):
                     z.write(child, arcname.as_posix())
             if main_py:
                 z.writestr('__main__.py', main_py.encode('utf-8'))

diff --git a/Misc/NEWS.d/next/Library/2025-02-24-14-46-20.gh-issue-130379.lsef7A.rst b/Misc/NEWS.d/next/Library/2025-02-24-14-46-20.gh-issue-130379.lsef7A.rst
new file mode 100644 (file)
index 0000000..157b283
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2025-02-24-14-46-20.gh-issue-130379.lsef7A.rst
@@ -0,0 +1 @@
+The zipapp module now calculates the list of files to be added to the archive before creating the archive. This avoids accidentally including the target when it is being created in the source directory.