ref: a1a120547768ee33ddaae4ee1965dfcf85149d8a
dir: /sys/src/cmd/hg/hgext/convert/common.py/
# common.py - common code for the convert extension
#
# Copyright 2005-2009 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, incorporated herein by reference.
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)
class MissingTool(Exception): pass
def checktool(exe, name=None, abort=True):
name = name or exe
if not util.find_exe(exe):
exc = abort and util.Abort or MissingTool
raise exc(_('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={}, sortkey=None):
self.author = author or 'unknown'
self.date = date or '0 0'
self.desc = desc
self.parents = parents
self.branch = branch
self.rev = rev
self.extra = extra
self.sortkey = sortkey
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. rev is the identifier returned
by a previous call to getchanges(). Raise IOError to indicate that
name was deleted in rev.
"""
raise NotImplementedError()
def getmode(self, name, rev):
"""Return file mode, eg. '', 'x', or 'l'. rev is the identifier
returned by a previous call to getchanges().
"""
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 between version and its first parent returned by
getcommit(). 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
Tag names must be UTF-8 strings.
"""
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
def hasnativeorder(self):
"""Return true if this source has a meaningful, native revision
order. For instance, Mercurial revisions are store sequentially
while there is no such global ordering with Darcs.
"""
return False
def lookuprev(self, rev):
"""If rev is a meaningful revision reference in source, return
the referenced identifier in the same format used by getcommit().
return None otherwise.
"""
return None
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 putcommit(self, files, copies, parents, commit, source, revmap):
"""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. 'files' is a list of (path, version) tuples,
'copies' is a dictionary mapping destinations to sources,
'source' is the source repository, and 'revmap' is a mapfile
of source revisions to converted revisions. Only getfile(),
getmode(), and lookuprev() should be called on 'source'.
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, ...} where tagname is an UTF-8 string.
"""
raise NotImplementedError()
def setbranch(self, branch, pbranches):
"""Set the current branch name. Called before the first putcommit
on the branch.
branch: branch name for subsequent commits
pbranches: (converted parent revision, parent branch) tuples"""
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]
if not self.ui.debugflag:
cmdline += ['2>', util.nulldev]
cmdline += ['<', util.nulldev]
cmdline = ' '.join(cmdline)
return cmdline
def _run(self, cmd, *args, **kwargs):
cmdline = self._cmdline(cmd, *args, **kwargs)
self.ui.debug(_('running: %s\n') % (cmdline,))
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 runlines(self, cmd, *args, **kwargs):
fp = self._run(cmd, *args, **kwargs)
output = fp.readlines()
self.ui.debug(''.join(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 runlines0(self, cmd, *args, **kwargs):
output, status = self.runlines(cmd, *args, **kwargs)
self.checkexit(status, ''.join(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):
if not self.path:
return
try:
fp = open(self.path, 'r')
except IOError, err:
if err.errno != errno.ENOENT:
raise
return
for i, line in enumerate(fp):
try:
key, value = line[:-1].rsplit(' ', 1)
except ValueError:
raise util.Abort(_('syntax error in %s(%d): key/value pair expected')
% (self.path, i+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