diffstat: made test case work with POSIX sh and printf
* arithmetic expression ((...)), without $, is bashism.
* printf '\xXX' seems non-standard. '\0' is okay.
http://www.opengroup.org/onlinepubs/009695399/utilities/printf.html
tested with bash 4.0 and dash 0.5.5.1
#!/bin/sh
"$TESTDIR/hghave" execbit || exit 80
hg init
echo a > a
hg ci -Am'not executable'
chmod +x a
hg ci -m'executable'
hg id
echo '% make sure we notice the change of mode if the cached size == -1'
hg rm a
hg revert -r 0 a
hg debugstate
hg st
hg up 0
hg id
test -x a && echo executable -- eek || echo not executable -- whew