Mercurial > hg
view hgext/convert/common.py @ 5832:2192ed187319
convert: add commandline.xargs(), use it in svn_sink class
Introduce commandline.xargs() to limit argument list with respect
to ARG_MAX bytes. If no ARG_MAX information available - use POSIX
required minimum of 4096 bytes.
Under Windows, while actual argument list length is limited to 32k,
shells impose their own limits on command line length, down to 2047 bytes
for cmd.exe under Windows NT/2k and about 2500 bytes for older 4nt.exe.
See http://support.microsoft.com/kb/830473 for details about cmd.exe
limitations.
Since ARG_MAX is limit for argument list and environment, we reserve half
of it and one byte for environment variables. This way with default ARG_MAX
(4096 bytes) we get value 2047 bytes which is OK for Windows too.
author | Maxim Dounin <mdounin@mdounin.ru> |
---|---|
date | Fri, 11 Jan 2008 06:07:43 +0300 |
parents | 0145f9afb0e7 |
children | 0162c6cc045e |
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# common code for the convert extension import base64, errno import os import cPickle as pickle from mercurial import util from mercurial.i18n import _ def encodeargs(args): def encodearg(s): lines = base64.encodestring(s) lines = [l.splitlines()[0] for l in lines] return ''.join(lines) s = pickle.dumps(args) return encodearg(s) def decodeargs(s): s = base64.decodestring(s) return pickle.loads(s) def checktool(exe, name=None): name = name or exe if not util.find_exe(exe): raise util.Abort('cannot find required "%s" tool' % name) class NoRepo(Exception): pass SKIPREV = 'SKIP' class commit(object): def __init__(self, author, date, desc, parents, branch=None, rev=None, extra={}): self.author = author self.date = date self.desc = desc self.parents = parents self.branch = branch self.rev = rev self.extra = extra class converter_source(object): """Conversion source interface""" def __init__(self, ui, path=None, rev=None): """Initialize conversion source (or raise NoRepo("message") exception if path is not a valid repository)""" self.ui = ui self.path = path self.rev = rev self.encoding = 'utf-8' def before(self): pass def after(self): pass def setrevmap(self, revmap): """set the map of already-converted revisions""" pass def getheads(self): """Return a list of this repository's heads""" raise NotImplementedError() def getfile(self, name, rev): """Return file contents as a string""" raise NotImplementedError() def getmode(self, name, rev): """Return file mode, eg. '', 'x', or 'l'""" raise NotImplementedError() def getchanges(self, version): """Returns a tuple of (files, copies) Files is a sorted list of (filename, id) tuples for all files changed in version, where id is the source revision id of the file. copies is a dictionary of dest: source """ raise NotImplementedError() def getcommit(self, version): """Return the commit object for version""" raise NotImplementedError() def gettags(self): """Return the tags as a dictionary of name: revision""" raise NotImplementedError() def recode(self, s, encoding=None): if not encoding: encoding = self.encoding or 'utf-8' if isinstance(s, unicode): return s.encode("utf-8") try: return s.decode(encoding).encode("utf-8") except: try: return s.decode("latin-1").encode("utf-8") except: return s.decode(encoding, "replace").encode("utf-8") def getchangedfiles(self, rev, i): """Return the files changed by rev compared to parent[i]. i is an index selecting one of the parents of rev. The return value should be the list of files that are different in rev and this parent. If rev has no parents, i is None. This function is only needed to support --filemap """ raise NotImplementedError() def converted(self, rev, sinkrev): '''Notify the source that a revision has been converted.''' pass class converter_sink(object): """Conversion sink (target) interface""" def __init__(self, ui, path): """Initialize conversion sink (or raise NoRepo("message") exception if path is not a valid repository) created is a list of paths to remove if a fatal error occurs later""" self.ui = ui self.path = path self.created = [] def getheads(self): """Return a list of this repository's heads""" raise NotImplementedError() def revmapfile(self): """Path to a file that will contain lines source_rev_id sink_rev_id mapping equivalent revision identifiers for each system.""" raise NotImplementedError() def authorfile(self): """Path to a file that will contain lines srcauthor=dstauthor mapping equivalent authors identifiers for each system.""" return None def putfile(self, f, e, data): """Put file for next putcommit(). f: path to file e: '', 'x', or 'l' (regular file, executable, or symlink) data: file contents""" raise NotImplementedError() def delfile(self, f): """Delete file for next putcommit(). f: path to file""" raise NotImplementedError() def putcommit(self, files, parents, commit): """Create a revision with all changed files listed in 'files' and having listed parents. 'commit' is a commit object containing at a minimum the author, date, and message for this changeset. Called after putfile() and delfile() calls. Note that the sink repository is not told to update itself to a particular revision (or even what that revision would be) before it receives the file data.""" raise NotImplementedError() def puttags(self, tags): """Put tags into sink. tags: {tagname: sink_rev_id, ...}""" raise NotImplementedError() def setbranch(self, branch, pbranch, parents): """Set the current branch name. Called before the first putfile on the branch. branch: branch name for subsequent commits pbranch: branch name of parent commit parents: destination revisions of parent""" pass def setfilemapmode(self, active): """Tell the destination that we're using a filemap Some converter_sources (svn in particular) can claim that a file was changed in a revision, even if there was no change. This method tells the destination that we're using a filemap and that it should filter empty revisions. """ pass def before(self): pass def after(self): pass class commandline(object): def __init__(self, ui, command): self.ui = ui self.command = command def prerun(self): pass def postrun(self): pass def _cmdline(self, cmd, *args, **kwargs): cmdline = [self.command, cmd] + list(args) for k, v in kwargs.iteritems(): if len(k) == 1: cmdline.append('-' + k) else: cmdline.append('--' + k.replace('_', '-')) try: if len(k) == 1: cmdline.append('' + v) else: cmdline[-1] += '=' + v except TypeError: pass cmdline = [util.shellquote(arg) for arg in cmdline] cmdline += ['<', util.nulldev] cmdline = ' '.join(cmdline) self.ui.debug(cmdline, '\n') return cmdline def _run(self, cmd, *args, **kwargs): cmdline = self._cmdline(cmd, *args, **kwargs) self.prerun() try: return util.popen(cmdline) finally: self.postrun() def run(self, cmd, *args, **kwargs): fp = self._run(cmd, *args, **kwargs) output = fp.read() self.ui.debug(output) return output, fp.close() def checkexit(self, status, output=''): if status: if output: self.ui.warn(_('%s error:\n') % self.command) self.ui.warn(output) msg = util.explain_exit(status)[0] raise util.Abort(_('%s %s') % (self.command, msg)) def run0(self, cmd, *args, **kwargs): output, status = self.run(cmd, *args, **kwargs) self.checkexit(status, output) return output def getargmax(self): if '_argmax' in self.__dict__: return self._argmax # POSIX requires at least 4096 bytes for ARG_MAX self._argmax = 4096 try: self._argmax = os.sysconf("SC_ARG_MAX") except: pass # Windows shells impose their own limits on command line length, # down to 2047 bytes for cmd.exe under Windows NT/2k and 2500 bytes # for older 4nt.exe. See http://support.microsoft.com/kb/830473 for # details about cmd.exe limitations. # Since ARG_MAX is for command line _and_ environment, lower our limit # (and make happy Windows shells while doing this). self._argmax = self._argmax/2 - 1 return self._argmax def limit_arglist(self, arglist, cmd, *args, **kwargs): limit = self.getargmax() - len(self._cmdline(cmd, *args, **kwargs)) bytes = 0 fl = [] for fn in arglist: b = len(fn) + 3 if bytes + b < limit or len(fl) == 0: fl.append(fn) bytes += b else: yield fl fl = [fn] bytes = b if fl: yield fl def xargs(self, arglist, cmd, *args, **kwargs): for l in self.limit_arglist(arglist, cmd, *args, **kwargs): self.run0(cmd, *(list(args) + l), **kwargs) class mapfile(dict): def __init__(self, ui, path): super(mapfile, self).__init__() self.ui = ui self.path = path self.fp = None self.order = [] self._read() def _read(self): try: fp = open(self.path, 'r') except IOError, err: if err.errno != errno.ENOENT: raise return for line in fp: key, value = line[:-1].split(' ', 1) if key not in self: self.order.append(key) super(mapfile, self).__setitem__(key, value) fp.close() def __setitem__(self, key, value): if self.fp is None: try: self.fp = open(self.path, 'a') except IOError, err: raise util.Abort(_('could not open map file %r: %s') % (self.path, err.strerror)) self.fp.write('%s %s\n' % (key, value)) self.fp.flush() super(mapfile, self).__setitem__(key, value) def close(self): if self.fp: self.fp.close() self.fp = None