Make tests work on Solaris: - replacement for mktemp - fall back if shell arithmetic doesn't work - replacement for 'set -x' (which results look different with some shells) - "FOO=bar; export FOO" instead of "export FOO=bar" - don't use 'if ! ...'

#!/bin/sh

hg init
mkfifo p

hg serve --stdio < p &
P=$!
(echo lock; echo addchangegroup; sleep 5) > p &
Q=$!
sleep 1
kill -HUP $P
sleep 1
ls .hg