Mercurial > hg
view mercurial/minifileset.py @ 36523:e7411fb7ba7f
wireprotoserver: ability to run an SSH server until an event is set
It seems useful to be able to start an SSH protocol server that
won't run forever and won't call sys.exit() when it stops. This
could be used to facilitate intra-process testing of the SSH
protocol, for example.
We teach the server function to loop until a threading.Event is set
and invent a new API to run the server until an event is set. It also
won't sys.exit() afterwards.
There aren't many callers of serve_forever(). So we could refactor
them relatively easily. But I was lazy.
threading.Event might be a bit heavyweight. An alternative would be
a list whose only elements is changed. We can't use a simple scalar
value like a bool or int because those types are immutable. Events
are what you use in systems programming for this use case, so the
use of threading.Event seems justified.
Differential Revision: https://phab.mercurial-scm.org/D2461
author | Gregory Szorc <gregory.szorc@gmail.com> |
---|---|
date | Sat, 24 Feb 2018 12:07:21 -0800 |
parents | d5288b966e2f |
children | 9c98cb30f4de |
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# minifileset.py - a simple language to select files # # Copyright 2017 Facebook, Inc. # # 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 from .i18n import _ from . import ( error, fileset, ) def _compile(tree): if not tree: raise error.ParseError(_("missing argument")) op = tree[0] if op in {'symbol', 'string', 'kindpat'}: name = fileset.getpattern(tree, {'path'}, _('invalid file pattern')) if name.startswith('**'): # file extension test, ex. "**.tar.gz" ext = name[2:] for c in ext: if c in '*{}[]?/\\': raise error.ParseError(_('reserved character: %s') % c) return lambda n, s: n.endswith(ext) elif name.startswith('path:'): # directory or full path test p = name[5:] # prefix pl = len(p) f = lambda n, s: n.startswith(p) and (len(n) == pl or n[pl] == '/') return f raise error.ParseError(_("unsupported file pattern: %s") % name, hint=_('paths must be prefixed with "path:"')) elif op == 'or': func1 = _compile(tree[1]) func2 = _compile(tree[2]) return lambda n, s: func1(n, s) or func2(n, s) elif op == 'and': func1 = _compile(tree[1]) func2 = _compile(tree[2]) return lambda n, s: func1(n, s) and func2(n, s) elif op == 'not': return lambda n, s: not _compile(tree[1])(n, s) elif op == 'group': return _compile(tree[1]) elif op == 'func': symbols = { 'all': lambda n, s: True, 'none': lambda n, s: False, 'size': lambda n, s: fileset.sizematcher(tree[2])(s), } name = fileset.getsymbol(tree[1]) if name in symbols: return symbols[name] raise error.UnknownIdentifier(name, symbols.keys()) elif op == 'minus': # equivalent to 'x and not y' func1 = _compile(tree[1]) func2 = _compile(tree[2]) return lambda n, s: func1(n, s) and not func2(n, s) elif op == 'negate': raise error.ParseError(_("can't use negate operator in this context")) elif op == 'list': raise error.ParseError(_("can't use a list in this context"), hint=_('see hg help "filesets.x or y"')) raise error.ProgrammingError('illegal tree: %r' % (tree,)) def compile(text): """generate a function (path, size) -> bool from filter specification. "text" could contain the operators defined by the fileset language for common logic operations, and parenthesis for grouping. The supported path tests are '**.extname' for file extension test, and '"path:dir/subdir"' for prefix test. The ``size()`` predicate is borrowed from filesets to test file size. The predicates ``all()`` and ``none()`` are also supported. '(**.php & size(">10MB")) | **.zip | (path:bin & !path:bin/README)' for example, will catch all php files whose size is greater than 10 MB, all files whose name ends with ".zip", and all files under "bin" in the repo root except for "bin/README". """ tree = fileset.parse(text) return _compile(tree)