view mercurial/utils/repoviewutil.py @ 47055:553451522113 stable

extensions: ignore exceptions from an extension's `getversion()` method

This method is usually called when there's a stacktrace being generated, or with
`hg version -v`.  Raising another exception risks mangling the bug report info.

I hit this issue when trying to add the method to the keyring extension to
report the version of the extension and the underlying module, and ran into
demandimport issues prior to py3.8.  It seems like a wise thing to do anyway,
though unfortunately there's no convenient `ui` object around to issue a
warning.  Use 'unknown' to signal that it tried to report a version and failed,
unlike the default case of printing nothing.

Differential Revision: https://phab.mercurial-scm.org/D10540

# repoviewutil.py - constaints data relevant to repoview.py and other module
#
# Copyright 2012 Pierre-Yves David <[e-mail]>
#                Logilab SA        <[e-mail]>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.

from __future__ import absolute_import

### Nearest subset relation
# Nearest subset of filter X is a filter Y so that:
# * Y is included in X,
# * X - Y is as small as possible.
# This create and ordering used for branchmap purpose.
# the ordering may be partial
subsettable = {
    None: b'visible',
    b'visible-hidden': b'visible',
    b'visible': b'served',
    b'served.hidden': b'served',
    b'served': b'immutable',
    b'immutable': b'base',
}