archive: set date to 1980 for very old zip files The zip file format stores the date using "MS-DOS format" which apparently means that they use 1980 as their epoch. Python's zipfile module emits deprecation warnings of this form /usr/lib/python2.6/zipfile.py:1108: DeprecationWarning: struct integer overflow masking is deprecated self.fp.write(zinfo.FileHeader()) /usr/lib/python2.6/zipfile.py:1108: DeprecationWarning: 'H' format requires 0 <= number <= 65535 self.fp.write(zinfo.FileHeader()) /home/mg/src/mercurial-crew/mercurial/archival.py:169: DeprecationWarning: struct integer overflow masking is deprecated self.z.close() /home/mg/src/mercurial-crew/mercurial/archival.py:169: DeprecationWarning: 'H' format requires 0 <= number <= 65535 self.z.close() when it is given such old timestamps. This fixes this by silently clamping the date to 1980.

--- a/mercurial/archival.py	Fri Sep 17 12:44:35 2010 -0500
+++ b/mercurial/archival.py	Mon Sep 20 15:33:39 2010 +0200
@@ -139,6 +139,13 @@
         self.z = zipfile.ZipFile(dest, 'w',
                                  compress and zipfile.ZIP_DEFLATED or
                                  zipfile.ZIP_STORED)
+
+        # Python's zipfile module emits deprecation warnings if we try
+        # to store files with a date before 1980.
+        epoch = 315532800 # calendar.timegm((1980, 1, 1, 0, 0, 0, 1, 1, 0))
+        if mtime < epoch:
+            mtime = epoch
+
         self.date_time = time.gmtime(mtime)[:6]
 
     def addfile(self, name, mode, islink, data):