hgext/convert/darcs.py
author Yuya Nishihara <yuya@tcha.org>
Sun, 26 Mar 2017 19:06:48 +0900
changeset 31655 23391acfc421
parent 28368 b9296b330a54
child 35187 671aba341d90
permissions -rw-r--r--
py3: fix manifestdict.fastdelta() to be compatible with memoryview This doesn't look nice, but a straightforward way to support Python 3. bytes(m[start:end]) is needed because a memoryview doesn't support ordering operations. On Python 2, m[start:end] returns a bytes object even if m is a buffer, so calling bytes() should involve no additional copy. I'm tired of trying cleaner alternatives, including: a. extend memoryview to be compatible with buffer type => memoryview is not an acceptable base type b. wrap memoryview by buffer-like class => zlib complains it isn't bytes-like
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# darcs.py - darcs support for the convert extension
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#
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#  Copyright 2007-2009 Matt Mackall <mpm@selenic.com> and others
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#
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# This software may be used and distributed according to the terms of the
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# GNU General Public License version 2 or any later version.
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from __future__ import absolute_import
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import errno
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import os
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import re
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import shutil
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import tempfile
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from mercurial.i18n import _
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from mercurial import (
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    error,
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    util,
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)
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from . import common
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NoRepo = common.NoRepo
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# The naming drift of ElementTree is fun!
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try:
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    import xml.etree.cElementTree.ElementTree as ElementTree
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    import xml.etree.cElementTree.XMLParser as XMLParser
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except ImportError:
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    try:
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        import xml.etree.ElementTree.ElementTree as ElementTree
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        import xml.etree.ElementTree.XMLParser as XMLParser
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    except ImportError:
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        try:
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            import elementtree.cElementTree.ElementTree as ElementTree
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            import elementtree.cElementTree.XMLParser as XMLParser
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        except ImportError:
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            try:
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                import elementtree.ElementTree.ElementTree as ElementTree
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                import elementtree.ElementTree.XMLParser  as XMLParser
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            except ImportError:
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                pass
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class darcs_source(common.converter_source, common.commandline):
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    def __init__(self, ui, path, revs=None):
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        common.converter_source.__init__(self, ui, path, revs=revs)
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        common.commandline.__init__(self, ui, 'darcs')
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        # check for _darcs, ElementTree so that we can easily skip
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        # test-convert-darcs if ElementTree is not around
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        if not os.path.exists(os.path.join(path, '_darcs')):
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            raise NoRepo(_("%s does not look like a darcs repository") % path)
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        common.checktool('darcs')
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        version = self.run0('--version').splitlines()[0].strip()
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        if version < '2.1':
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            raise error.Abort(_('darcs version 2.1 or newer needed (found %r)')
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                              % version)
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        if "ElementTree" not in globals():
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            raise error.Abort(_("Python ElementTree module is not available"))
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        self.path = os.path.realpath(path)
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        self.lastrev = None
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        self.changes = {}
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        self.parents = {}
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        self.tags = {}
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        # Check darcs repository format
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        format = self.format()
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        if format:
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            if format in ('darcs-1.0', 'hashed'):
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                raise NoRepo(_("%s repository format is unsupported, "
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                               "please upgrade") % format)
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        else:
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            self.ui.warn(_('failed to detect repository format!'))
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    def before(self):
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        self.tmppath = tempfile.mkdtemp(
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            prefix='convert-' + os.path.basename(self.path) + '-')
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        output, status = self.run('init', repodir=self.tmppath)
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        self.checkexit(status)
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        tree = self.xml('changes', xml_output=True, summary=True,
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                        repodir=self.path)
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        tagname = None
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        child = None
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        for elt in tree.findall('patch'):
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            node = elt.get('hash')
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            name = elt.findtext('name', '')
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            if name.startswith('TAG '):
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                tagname = name[4:].strip()
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            elif tagname is not None:
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                self.tags[tagname] = node
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                tagname = None
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            self.changes[node] = elt
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            self.parents[child] = [node]
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            child = node
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        self.parents[child] = []
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    def after(self):
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        self.ui.debug('cleaning up %s\n' % self.tmppath)
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        shutil.rmtree(self.tmppath, ignore_errors=True)
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    def recode(self, s, encoding=None):
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        if isinstance(s, unicode):
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            # XMLParser returns unicode objects for anything it can't
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            # encode into ASCII. We convert them back to str to get
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            # recode's normal conversion behavior.
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            s = s.encode('latin-1')
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        return super(darcs_source, self).recode(s, encoding)
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    def xml(self, cmd, **kwargs):
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        # NOTE: darcs is currently encoding agnostic and will print
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        # patch metadata byte-for-byte, even in the XML changelog.
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        etree = ElementTree()
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        # While we are decoding the XML as latin-1 to be as liberal as
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        # possible, etree will still raise an exception if any
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        # non-printable characters are in the XML changelog.
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        parser = XMLParser(encoding='latin-1')
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        p = self._run(cmd, **kwargs)
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        etree.parse(p.stdout, parser=parser)
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        p.wait()
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        self.checkexit(p.returncode)
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        return etree.getroot()
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    def format(self):
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        output, status = self.run('show', 'repo', no_files=True,
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                                  repodir=self.path)
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        self.checkexit(status)
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        m = re.search(r'^\s*Format:\s*(.*)$', output, re.MULTILINE)
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        if not m:
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            return None
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        return ','.join(sorted(f.strip() for f in m.group(1).split(',')))
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    def manifest(self):
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        man = []
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        output, status = self.run('show', 'files', no_directories=True,
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                                  repodir=self.tmppath)
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        self.checkexit(status)
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        for line in output.split('\n'):
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            path = line[2:]
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            if path:
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                man.append(path)
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        return man
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    def getheads(self):
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        return self.parents[None]
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    def getcommit(self, rev):
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        elt = self.changes[rev]
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        date = util.strdate(elt.get('local_date'), '%a %b %d %H:%M:%S %Z %Y')
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        desc = elt.findtext('name') + '\n' + elt.findtext('comment', '')
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        # etree can return unicode objects for name, comment, and author,
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        # so recode() is used to ensure str objects are emitted.
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        return common.commit(author=self.recode(elt.get('author')),
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                             date=util.datestr(date, '%Y-%m-%d %H:%M:%S %1%2'),
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                             desc=self.recode(desc).strip(),
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                             parents=self.parents[rev])
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    def pull(self, rev):
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        output, status = self.run('pull', self.path, all=True,
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                                  match='hash %s' % rev,
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                                  no_test=True, no_posthook=True,
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                                  external_merge='/bin/false',
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                                  repodir=self.tmppath)
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        if status:
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            if output.find('We have conflicts in') == -1:
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                self.checkexit(status, output)
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            output, status = self.run('revert', all=True, repodir=self.tmppath)
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            self.checkexit(status, output)
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    def getchanges(self, rev, full):
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        if full:
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            raise error.Abort(_("convert from darcs does not support --full"))
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        copies = {}
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        changes = []
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        man = None
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        for elt in self.changes[rev].find('summary').getchildren():
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            if elt.tag in ('add_directory', 'remove_directory'):
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                continue
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            if elt.tag == 'move':
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                if man is None:
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                    man = self.manifest()
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                source, dest = elt.get('from'), elt.get('to')
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                if source in man:
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                    # File move
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                    changes.append((source, rev))
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                    changes.append((dest, rev))
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                    copies[dest] = source
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                else:
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                    # Directory move, deduce file moves from manifest
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                    source = source + '/'
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                    for f in man:
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                        if not f.startswith(source):
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                            continue
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                        fdest = dest + '/' + f[len(source):]
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                        changes.append((f, rev))
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                        changes.append((fdest, rev))
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                        copies[fdest] = f
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            else:
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                changes.append((elt.text.strip(), rev))
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        self.pull(rev)
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        self.lastrev = rev
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        return sorted(changes), copies, set()
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    def getfile(self, name, rev):
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        if rev != self.lastrev:
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            raise error.Abort(_('internal calling inconsistency'))
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        path = os.path.join(self.tmppath, name)
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        try:
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            data = util.readfile(path)
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            mode = os.lstat(path).st_mode
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        except IOError as inst:
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            if inst.errno == errno.ENOENT:
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                return None, None
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            raise
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        mode = (mode & 0o111) and 'x' or ''
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        return data, mode
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    def gettags(self):
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   221
        return self.tags