Mercurial > hg
view mercurial/config.py @ 38526:313a940d49a3
ui: add an uninterruptable context manager that can block SIGINT
The blocking of SIGINT is not done by default, but my hope is that we
will one day. This was inspired by Facebook's "nointerrupt" extension,
which is a bit more heavy-handed than this (whole commands are treated
as unsafe to interrupt). A future patch will enable this for varying
bits of Mercurial that are performing unsafe operations.
It's intentional that the KeyboardInterrupt is raised as the context
manager exits: during the span of the context manager interrupting
Mercurial could lead to data loss, but typically those spans are
fairly narrow, so we can let the unsafe block complete and then
terminate hg (which will leave the repo in a consistent state, even if
it's not the user's desired state).
.. api::
New context manager ``ui.uninterruptable()`` to mark portions of a command
as potentially unsafe places to interrupt Mercurial with Control-C or
similar.
Differential Revision: https://phab.mercurial-scm.org/D3716
author | Augie Fackler <augie@google.com> |
---|---|
date | Wed, 27 Jun 2018 10:47:14 -0400 |
parents | 48378d0e9479 |
children | 4ad002b2584d |
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# config.py - configuration parsing for Mercurial # # Copyright 2009 Matt Mackall <mpm@selenic.com> and others # # 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 import errno import os from .i18n import _ from . import ( error, pycompat, util, ) class config(object): def __init__(self, data=None, includepaths=None): self._data = {} self._unset = [] self._includepaths = includepaths or [] if data: for k in data._data: self._data[k] = data[k].copy() self._source = data._source.copy() else: self._source = util.cowdict() def copy(self): return config(self) def __contains__(self, section): return section in self._data def hasitem(self, section, item): return item in self._data.get(section, {}) def __getitem__(self, section): return self._data.get(section, {}) def __iter__(self): for d in self.sections(): yield d def update(self, src): self._source = self._source.preparewrite() for s, n in src._unset: ds = self._data.get(s, None) if ds is not None and n in ds: self._data[s] = ds.preparewrite() del self._data[s][n] del self._source[(s, n)] for s in src: ds = self._data.get(s, None) if ds: self._data[s] = ds.preparewrite() else: self._data[s] = util.cowsortdict() self._data[s].update(src._data[s]) self._source.update(src._source) def get(self, section, item, default=None): return self._data.get(section, {}).get(item, default) def backup(self, section, item): """return a tuple allowing restore to reinstall a previous value The main reason we need it is because it handles the "no data" case. """ try: value = self._data[section][item] source = self.source(section, item) return (section, item, value, source) except KeyError: return (section, item) def source(self, section, item): return self._source.get((section, item), "") def sections(self): return sorted(self._data.keys()) def items(self, section): return list(self._data.get(section, {}).iteritems()) def set(self, section, item, value, source=""): if pycompat.ispy3: assert not isinstance(value, str), ( 'config values may not be unicode strings on Python 3') if section not in self: self._data[section] = util.cowsortdict() else: self._data[section] = self._data[section].preparewrite() self._data[section][item] = value if source: self._source = self._source.preparewrite() self._source[(section, item)] = source def restore(self, data): """restore data returned by self.backup""" self._source = self._source.preparewrite() if len(data) == 4: # restore old data section, item, value, source = data self._data[section] = self._data[section].preparewrite() self._data[section][item] = value self._source[(section, item)] = source else: # no data before, remove everything section, item = data if section in self._data: self._data[section].pop(item, None) self._source.pop((section, item), None) def parse(self, src, data, sections=None, remap=None, include=None): sectionre = util.re.compile(br'\[([^\[]+)\]') itemre = util.re.compile(br'([^=\s][^=]*?)\s*=\s*(.*\S|)') contre = util.re.compile(br'\s+(\S|\S.*\S)\s*$') emptyre = util.re.compile(br'(;|#|\s*$)') commentre = util.re.compile(br'(;|#)') unsetre = util.re.compile(br'%unset\s+(\S+)') includere = util.re.compile(br'%include\s+(\S|\S.*\S)\s*$') section = "" item = None line = 0 cont = False if remap: section = remap.get(section, section) for l in data.splitlines(True): line += 1 if line == 1 and l.startswith('\xef\xbb\xbf'): # Someone set us up the BOM l = l[3:] if cont: if commentre.match(l): continue m = contre.match(l) if m: if sections and section not in sections: continue v = self.get(section, item) + "\n" + m.group(1) self.set(section, item, v, "%s:%d" % (src, line)) continue item = None cont = False m = includere.match(l) if m and include: expanded = util.expandpath(m.group(1)) includepaths = [os.path.dirname(src)] + self._includepaths for base in includepaths: inc = os.path.normpath(os.path.join(base, expanded)) try: include(inc, remap=remap, sections=sections) break except IOError as inst: if inst.errno != errno.ENOENT: raise error.ParseError(_("cannot include %s (%s)") % (inc, inst.strerror), "%s:%d" % (src, line)) continue if emptyre.match(l): continue m = sectionre.match(l) if m: section = m.group(1) if remap: section = remap.get(section, section) if section not in self: self._data[section] = util.cowsortdict() continue m = itemre.match(l) if m: item = m.group(1) cont = True if sections and section not in sections: continue self.set(section, item, m.group(2), "%s:%d" % (src, line)) continue m = unsetre.match(l) if m: name = m.group(1) if sections and section not in sections: continue if self.get(section, name) is not None: self._data[section] = self._data[section].preparewrite() del self._data[section][name] self._unset.append((section, name)) continue raise error.ParseError(l.rstrip(), ("%s:%d" % (src, line))) def read(self, path, fp=None, sections=None, remap=None): if not fp: fp = util.posixfile(path, 'rb') assert getattr(fp, 'mode', r'rb') == r'rb', ( 'config files must be opened in binary mode, got fp=%r mode=%r' % ( fp, fp.mode)) self.parse(path, fp.read(), sections=sections, remap=remap, include=self.read) def parselist(value): """parse a configuration value as a list of comma/space separated strings >>> parselist(b'this,is "a small" ,test') ['this', 'is', 'a small', 'test'] """ def _parse_plain(parts, s, offset): whitespace = False while offset < len(s) and (s[offset:offset + 1].isspace() or s[offset:offset + 1] == ','): whitespace = True offset += 1 if offset >= len(s): return None, parts, offset if whitespace: parts.append('') if s[offset:offset + 1] == '"' and not parts[-1]: return _parse_quote, parts, offset + 1 elif s[offset:offset + 1] == '"' and parts[-1][-1:] == '\\': parts[-1] = parts[-1][:-1] + s[offset:offset + 1] return _parse_plain, parts, offset + 1 parts[-1] += s[offset:offset + 1] return _parse_plain, parts, offset + 1 def _parse_quote(parts, s, offset): if offset < len(s) and s[offset:offset + 1] == '"': # "" parts.append('') offset += 1 while offset < len(s) and (s[offset:offset + 1].isspace() or s[offset:offset + 1] == ','): offset += 1 return _parse_plain, parts, offset while offset < len(s) and s[offset:offset + 1] != '"': if (s[offset:offset + 1] == '\\' and offset + 1 < len(s) and s[offset + 1:offset + 2] == '"'): offset += 1 parts[-1] += '"' else: parts[-1] += s[offset:offset + 1] offset += 1 if offset >= len(s): real_parts = _configlist(parts[-1]) if not real_parts: parts[-1] = '"' else: real_parts[0] = '"' + real_parts[0] parts = parts[:-1] parts.extend(real_parts) return None, parts, offset offset += 1 while offset < len(s) and s[offset:offset + 1] in [' ', ',']: offset += 1 if offset < len(s): if offset + 1 == len(s) and s[offset:offset + 1] == '"': parts[-1] += '"' offset += 1 else: parts.append('') else: return None, parts, offset return _parse_plain, parts, offset def _configlist(s): s = s.rstrip(' ,') if not s: return [] parser, parts, offset = _parse_plain, [''], 0 while parser: parser, parts, offset = parser(parts, s, offset) return parts if value is not None and isinstance(value, bytes): result = _configlist(value.lstrip(' ,\n')) else: result = value return result or []