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[dak/master 1/2] don't include filename or timestamp in gzipped files

(optional: also compress at level 9)

Omitting the timestamp makes it possible to reconstruct an exact copy of the .gz
file given only the uncompressed contents.  The approx caching proxy relies on this
to apply pdiffs and generate compressed index files that correctly match their checksums.

Signed-off-by: Eric Cooper <ecc@cmu.edu>
 daklib/filewriter.py |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/daklib/filewriter.py b/daklib/filewriter.py
index 8907fa6..4958c10 100755
--- a/daklib/filewriter.py
+++ b/daklib/filewriter.py
@@ -74,7 +74,7 @@ class BaseFileWriter(object):
         if self.gzip:
-            check_call('gzip --rsyncable <%s.new >%s.gz.new' % (self.path, self.path),
+            check_call('gzip -9cn --rsyncable <%s.new >%s.gz.new' % (self.path, self.path),
                 shell = True)
             self.rename('%s.gz' % self.path)
         if self.bzip2:

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