tests/test-imerge

Fix income/pull with bundle and -R (issue 820).

Uses ui.setconfig() to tell bundlerepo where the main repo is. This is
needed for when the --repository option is used.

Adds tests to test-bundle and a new test script
test-mq-pull-from-bundle, which plays out the situation that initially
made me detect this bug

(hg -R .hg/patches pull ../bundle.hg).

#!/bin/sh

echo "[extensions]" >> $HGRCPATH
echo "imerge=" >> $HGRCPATH
HGMERGE=true
export HGMERGE

hg init base
cd base

echo foo > foo
echo bar > bar
hg ci -Am0 -d '0 0'

hg mv foo foo2
echo foo >> foo2
hg ci -m1 -d '1 0'

hg up -C 0
echo bar >> foo
echo bar >> bar
hg ci -m2 -d '2 0'

echo % start imerge
hg imerge

cat foo2
cat bar

echo % status -v
hg -v imerge st

echo % next
hg imerge next

echo % merge next
hg --traceback imerge

echo % unresolve
hg imerge unres foo

echo % merge foo
hg imerge merge foo

echo % save
echo foo > foo2
hg imerge save ../savedmerge

echo % load
hg up -C 0
hg imerge --traceback load ../savedmerge
cat foo2

hg ci -m'merged' -d '3 0'
hg tip -v

echo % nothing to merge -- tip
hg imerge

hg up 0
echo % nothing to merge
hg imerge

exit 0