pure/mpatch: use StringIO instead of mmap (issue1493) This is more portable than memory mapping /dev/zero: Windows obviously does not have /dev/zero and mapping /dev/zero failed on Mac OS X.

#!/bin/sh

mkdir t
cd t
hg init
echo a > a
hg add a
hg commit -m test -d "1000000 0"
hg history
hg manifest --debug
hg cat a
hg verify