tests/test-convert

run-tests: redefine --with-hg so it takes the 'hg' script to run.

- in parseargs(), check that --with-hg value is valid
- add handy --local option for "--with-hg=../hg"
- ensure that we always set PATH and PYTHONPATH (not just
  when doing a temporary install)
- override any existing PYTHONPATH, so test success does not
  depend on whatever happens to be in the caller's environment
- give tests a little more control by exporting $PYTHON to the
  environment; needed by test-convert and test-mergetool when
  they run hg with a stripped-down $PATH

Also, add a big comment explaining all the corner cases to test for the
next person who tries to modify this script.

#!/bin/sh

cat >> $HGRCPATH <<EOF
[extensions]
convert=
[convert]
hg.saverev=False
EOF

hg help convert

hg init a
cd a
echo a > a
hg ci -d'0 0' -Ama
hg cp a b
hg ci -d'1 0' -mb
hg rm a
hg ci -d'2 0' -mc
hg mv b a
hg ci -d'3 0' -md
echo a >> a
hg ci -d'4 0' -me

cd ..
hg convert a 2>&1 | grep -v 'subversion python bindings could not be loaded'
hg --cwd a-hg pull ../a

touch bogusfile
echo % should fail
hg convert a bogusfile

mkdir bogusdir
chmod 000 bogusdir

echo % should fail
hg convert a bogusdir

echo % should succeed
chmod 700 bogusdir
hg convert a bogusdir

echo % test pre and post conversion actions
echo 'include b' > filemap
hg convert --debug --filemap filemap a partialb | \
    grep 'run hg'

echo % converting empty dir should fail "nicely"
mkdir emptydir
# override $PATH to ensure p4 not visible; use $PYTHON in case we're
# running from a devel copy, not a temp installation
PATH=$BINDIR $PYTHON $BINDIR/hg convert emptydir 2>&1 | sed 's,file://.*/emptydir,.../emptydir,g'