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.

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import os, sys

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from mercurial import hg, ui

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TESTDIR = os.environ["TESTDIR"]

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# only makes sense to test on os which supports symlinks

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if not hasattr(os, "symlink"):

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    sys.exit(80) # SKIPPED_STATUS defined in run-tests.py

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# this is what symlink would do on a non-symlink file system

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def symlink_failure(src, dst):

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    raise OSError, (1, "Operation not permitted")

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os.symlink = symlink_failure

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# now try cloning a repo which contains symlinks

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u = ui.ui()

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hg.clone(u, os.path.join(TESTDIR, 'test-no-symlinks.hg'), 'test1')