Make the project tarball reproducible on Mac OS X.

Use zero modification time in the gzip header instead of current time.
Order of tarfile members depends on the os.listdir order, which is
arbitrary on Linux, but seems reproducible on Mac OS X.

Author: pavoljuhas

devutils/makesdist

@@ -9,6 +9,7 @@ import os
 import subprocess
 import glob
 import tarfile
+import gzip
 
 BASEDIR = os.path.dirname(os.path.dirname(os.path.realpath(__file__)))
 sys.path.insert(0, BASEDIR)
@@ -29,7 +30,8 @@ print "[done]"
 tarname = max(glob.glob(BASEDIR + '/dist/*.tar'), key=os.path.getmtime)
 
 tfin = tarfile.open(tarname)
-tfout = tarfile.open(tarname + '.gz', 'w:gz')
+fpout = gzip.GzipFile(tarname + '.gz', 'w', mtime=0)
+tfout = tarfile.open(fileobj=fpout, mode='w')
 
 def fixtarinfo(tinfo):
     tinfo.uid = tinfo.gid = 0
@@ -42,5 +44,7 @@ def fixtarinfo(tinfo):
 print 'Filter %s --> %s.gz' % (2 * (os.path.basename(tarname),)),
 for ti in tfin:
     tfout.addfile(fixtarinfo(ti), tfin.extractfile(ti))
+
+tfin.close()
 os.remove(tarname)
 print "[done]"