Issue #20262: Warnings are raised now when duplicate names are added in the
ZIP file or too long ZIP file comment is truncated.
diff --git a/Lib/test/test_zipfile.py b/Lib/test/test_zipfile.py
index a561d59..12a0f71 100644
--- a/Lib/test/test_zipfile.py
+++ b/Lib/test/test_zipfile.py
@@ -844,7 +844,9 @@
# Create the ZIP archive
with zipfile.ZipFile(TESTFN2, "w", zipfile.ZIP_STORED) as zipfp:
zipfp.writestr("name", "foo")
- zipfp.writestr("name", "bar")
+ with self.assertWarns(UserWarning):
+ zipfp.writestr("name", "bar")
+ self.assertEqual(zipfp.namelist(), ["name"] * 2)
with zipfile.ZipFile(TESTFN2, "r") as zipfp:
infos = zipfp.infolist()
@@ -1150,7 +1152,8 @@
# check a comment that is too long is truncated
with zipfile.ZipFile(TESTFN, mode="w") as zipf:
- zipf.comment = comment2 + b'oops'
+ with self.assertWarns(UserWarning):
+ zipf.comment = comment2 + b'oops'
zipf.writestr("foo.txt", "O, for a Muse of Fire!")
with zipfile.ZipFile(TESTFN, mode="r") as zipfr:
self.assertEqual(zipfr.comment, comment2)
diff --git a/Lib/zipfile.py b/Lib/zipfile.py
index a1b3414..ff64c90 100644
--- a/Lib/zipfile.py
+++ b/Lib/zipfile.py
@@ -1102,10 +1102,10 @@
if not isinstance(comment, bytes):
raise TypeError("comment: expected bytes, got %s" % type(comment))
# check for valid comment length
- if len(comment) >= ZIP_MAX_COMMENT:
- if self.debug:
- print('Archive comment is too long; truncating to %d bytes'
- % ZIP_MAX_COMMENT)
+ if len(comment) > ZIP_MAX_COMMENT:
+ import warnings
+ warnings.warn('Archive comment is too long; truncating to %d bytes'
+ % ZIP_MAX_COMMENT, stacklevel=2)
comment = comment[:ZIP_MAX_COMMENT]
self._comment = comment
self._didModify = True
@@ -1290,8 +1290,8 @@
def _writecheck(self, zinfo):
"""Check for errors before writing a file to the archive."""
if zinfo.filename in self.NameToInfo:
- if self.debug: # Warning for duplicate names
- print("Duplicate name:", zinfo.filename)
+ import warnings
+ warnings.warn('Duplicate name: %r' % zinfo.filename, stacklevel=3)
if self.mode not in ("w", "a"):
raise RuntimeError('write() requires mode "w" or "a"')
if not self.fp:
diff --git a/Misc/NEWS b/Misc/NEWS
index c95e45f..62ffaa5 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -43,6 +43,9 @@
Library
-------
+- Issue #20262: Warnings are raised now when duplicate names are added in the
+ ZIP file or too long ZIP file comment is truncated.
+
- Issue #18574: Added missing newline in 100-Continue reply from
http.server.BaseHTTPRequestHandler. Patch by Nikolaus Rath.