revlog: compute correct deltaparent in the deltaparent function It now returns nullrev for chain base revisions, since they are conceptually deltas against nullrev. The revdiff function was updated accordingly.

changelog: fixes leaked file handle

setdiscovery: limit lines to 80 characters

subrepo: use code from 71ea5b2b9517 only if Python needs it (issue2795) With Python >= 2.6 the original code already works correct, therefore the fix for issue2556 on Python <= 2.5 broke relative subrepositories with newer versions of Python.

sslutil: extracted ssl methods from httpsconnection in url.py This makes it easier to share ssl cert validation with other http implementations.

check-code: fix checking for sh style in .t tests Restore checks after they were disabled by 64de9ca66511.

run-tests: add --shell command line flag This makes it easy to test with, say, both /bin/bash and /bin/dash instead of changing the system-wide /bin/sh.

run-tests: use type of default to convert environment variable Before, defaults could only be integers, they can now also be strings, floats and what have you.

test-treediscovery: fix escaping for both dash and bash A '\n' on the command line is turned into a newline by dash, but kept as-is by bash, which resulted in a syntax error in the config file. Luckily, dash wont turn '\n' into a newline when it is part of a here-doc, so we can write the config file using that technique.

treediscovery: fix regression when run against older repos (issue2793) I ran the entire test suite with "known" and "getbundle" disabled in localrepository. This generated failures because the old findoutgoing had always queried remote's heads explicitly and thus always got them back in the returned heads. treediscovery.findcommonincoming now correctly returns remote's heads in all cases. Also adds a dedicated test for running treediscovery against a pre-getbundle HTTP server.