Backed out changeset 2ab464771b7d15c60014996d2853efc92cdb8465 - it always runs chmod - uses chmod in an unsafe way - if somebody does a clone of a repo, runs 'make tests', everything is fine, so he can assume the original repo is fine, too, but it is not.

#!/bin/sh
#
mkdir t
cd t
hg init
echo 0 > a
echo 0 > b
hg ci -A -m m -d "1000000 0"
hg rm a
hg cat a
sleep 1 # make sure mtime is changed
echo 1 > b
hg ci -m m -d "1000000 0"
echo 2 > b
hg cat -r 0 a
hg cat -r 0 b
hg cat -r 1 a
hg cat -r 1 b