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sslutil: try to find CA certficates in well-known locations...
sslutil: try to find CA certficates in well-known locations Many Linux distros and other Nixen have CA certificates in well-defined locations. Rather than potentially fail to load any CA certificates at all (which will always result in a certificate verification failure), we scan for paths to known CA certificate files and load one if seen. Because a proper Mercurial install will have the path to the CA certificate file defined at install time, we print a warning that the install isn't proper and provide a URL with instructions to correct things. We only perform path-based fallback on Pythons that don't know how to call into OpenSSL to load the default verify locations. This is because we trust that Python/OpenSSL is properly configured and knows better than Mercurial. So this new code effectively only runs on Python <2.7.9 (technically Pythons without the modern ssl module).

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extensions.txt
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Mercurial has the ability to add new features through the use of
extensions. Extensions may add new commands, add options to
existing commands, change the default behavior of commands, or
implement hooks.
To enable the "foo" extension, either shipped with Mercurial or in the
Python search path, create an entry for it in your configuration file,
like this::
[extensions]
foo =
You may also specify the full path to an extension::
[extensions]
myfeature = ~/.hgext/myfeature.py
See :hg:`help config` for more information on configuration files.
Extensions are not loaded by default for a variety of reasons:
they can increase startup overhead; they may be meant for advanced
usage only; they may provide potentially dangerous abilities (such
as letting you destroy or modify history); they might not be ready
for prime time; or they may alter some usual behaviors of stock
Mercurial. It is thus up to the user to activate extensions as
needed.
To explicitly disable an extension enabled in a configuration file of
broader scope, prepend its path with !::
[extensions]
# disabling extension bar residing in /path/to/extension/bar.py
bar = !/path/to/extension/bar.py
# ditto, but no path was supplied for extension baz
baz = !