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sshpeer: don't read from stderr when that behavior is disabled...
sshpeer: don't read from stderr when that behavior is disabled We previously prevented the creation of doublepipe instances when we're not supposed to automatically read from stderr. However, there were other automatic calls to read from stderr that were undermining this effort. This commit prevents all automatic reads from stderr from occurring when they are supposed to be disabled. Because stderr is no longer being read, we need to call "readavailable" from tests so stderr is read from. Test output changes because stderr is now always (manually) read after stdout. And, since sshpeer no longer automatically tends to stderr, no "remote: " messages are printed. This should fix non-deterministic test output. FWIW, doublepipe automatically reads from stderr when reading from stdout, so I'm not sure some of these calls to self._readerr() are even needed. Differential Revision: https://phab.mercurial-scm.org/D2571

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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 = !