Use a marker in generated MANIFEST files, don't touch files without it. Fixes #8688.
diff --git a/Lib/distutils/command/sdist.py b/Lib/distutils/command/sdist.py
index f51d72f..818a452 100644
--- a/Lib/distutils/command/sdist.py
+++ b/Lib/distutils/command/sdist.py
@@ -335,8 +335,21 @@
by 'add_defaults()' and 'read_template()') to the manifest file
named by 'self.manifest'.
"""
- self.execute(file_util.write_file,
- (self.manifest, self.filelist.files),
+ if os.path.isfile(self.manifest):
+ fp = open(self.manifest)
+ try:
+ first_line = fp.readline()
+ finally:
+ fp.close()
+
+ if first_line != '# file GENERATED by distutils, do NOT edit\n':
+ log.info("not writing to manually maintained "
+ "manifest file '%s'" % self.manifest)
+ return
+
+ content = self.filelist.files[:]
+ content.insert(0, '# file GENERATED by distutils, do NOT edit')
+ self.execute(file_util.write_file, (self.manifest, content),
"writing manifest file '%s'" % self.manifest)
def read_manifest(self):