cleanup: prefer nested context managers to \-continuations
I'd prefer Python accept a tuple of context managers, but alas it
isn't meant to be. This will have to suffice.
Differential Revision: https://phab.mercurial-scm.org/D5994
# 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 or any later version.
from __future__ import absolute_import
import base64
import datetime
import errno
import os
import re
import shlex
import subprocess
from mercurial.i18n import _
from mercurial import (
encoding,
error,
phases,
pycompat,
util,
)
from mercurial.utils import (
procutil,
)
pickle = util.pickle
propertycache = util.propertycache
def _encodeornone(d):
if d is None:
return
return d.encode('latin1')
class _shlexpy3proxy(object):
def __init__(self, l):
self._l = l
def __iter__(self):
return (_encodeornone(v) for v in self._l)
def get_token(self):
return _encodeornone(self._l.get_token())
@property
def infile(self):
return self._l.infile or '<unknown>'
@property
def lineno(self):
return self._l.lineno
def shlexer(data=None, filepath=None, wordchars=None, whitespace=None):
if data is None:
if pycompat.ispy3:
data = open(filepath, 'r', encoding=r'latin1')
else:
data = open(filepath, 'r')
else:
if filepath is not None:
raise error.ProgrammingError(
'shlexer only accepts data or filepath, not both')
if pycompat.ispy3:
data = data.decode('latin1')
l = shlex.shlex(data, infile=filepath, posix=True)
if whitespace is not None:
l.whitespace_split = True
if pycompat.ispy3:
l.whitespace += whitespace.decode('latin1')
else:
l.whitespace += whitespace
if wordchars is not None:
if pycompat.ispy3:
l.wordchars += wordchars.decode('latin1')
else:
l.wordchars += wordchars
if pycompat.ispy3:
return _shlexpy3proxy(l)
return l
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 procutil.findexe(exe):
if abort:
exc = error.Abort
else:
exc = 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=None, sortkey=None, saverev=True, phase=phases.draft,
optparents=None):
self.author = author or 'unknown'
self.date = date or '0 0'
self.desc = desc
self.parents = parents # will be converted and used as parents
self.optparents = optparents or [] # will be used if already converted
self.branch = branch
self.rev = rev
self.extra = extra or {}
self.sortkey = sortkey
self.saverev = saverev
self.phase = phase
class converter_source(object):
"""Conversion source interface"""
def __init__(self, ui, repotype, path=None, revs=None):
"""Initialize conversion source (or raise NoRepo("message")
exception if path is not a valid repository)"""
self.ui = ui
self.path = path
self.revs = revs
self.repotype = repotype
self.encoding = 'utf-8'
def checkhexformat(self, revstr, mapname='splicemap'):
""" fails if revstr is not a 40 byte hex. mercurial and git both uses
such format for their revision numbering
"""
if not re.match(br'[0-9a-fA-F]{40,40}$', revstr):
raise error.Abort(_('%s entry %s is not a valid revision'
' identifier') % (mapname, revstr))
def before(self):
pass
def after(self):
pass
def targetfilebelongstosource(self, targetfilename):
"""Returns true if the given targetfile belongs to the source repo. This
is useful when only a subdirectory of the target belongs to the source
repo."""
# For normal full repo converts, this is always True.
return True
def setrevmap(self, revmap):
"""set the map of already-converted revisions"""
def getheads(self):
"""Return a list of this repository's heads"""
raise NotImplementedError
def getfile(self, name, rev):
"""Return a pair (data, mode) where data is the file content
as a string and mode one of '', 'x' or 'l'. rev is the
identifier returned by a previous call to getchanges().
Data is None if file is missing/deleted in rev.
"""
raise NotImplementedError
def getchanges(self, version, full):
"""Returns a tuple of (files, copies, cleanp2).
files is a sorted list of (filename, id) tuples for all files
changed between version and its first parent returned by
getcommit(). If full, all files in that revision is returned.
id is the source revision id of the file.
copies is a dictionary of dest: source
cleanp2 is the set of files filenames that are clean against p2.
(Files that are clean against p1 are already not in files (unless
full). This makes it possible to handle p2 clean files similarly.)
"""
raise NotImplementedError
def getcommit(self, version):
"""Return the commit object for version"""
raise NotImplementedError
def numcommits(self):
"""Return the number of commits in this source.
If unknown, return None.
"""
return None
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, pycompat.unicode):
return s.encode("utf-8")
try:
return s.decode(pycompat.sysstr(encoding)).encode("utf-8")
except UnicodeError:
try:
return s.decode("latin-1").encode("utf-8")
except UnicodeError:
return s.decode(pycompat.sysstr(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.'''
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 hasnativeclose(self):
"""Return true if this source has ability to close branch.
"""
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
def getbookmarks(self):
"""Return the bookmarks as a dictionary of name: revision
Bookmark names are to be UTF-8 strings.
"""
return {}
def checkrevformat(self, revstr, mapname='splicemap'):
"""revstr is a string that describes a revision in the given
source control system. Return true if revstr has correct
format.
"""
return True
class converter_sink(object):
"""Conversion sink (target) interface"""
def __init__(self, ui, repotype, 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 = []
self.repotype = repotype
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, full,
cleanp2):
"""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() and
lookuprev() should be called on 'source'. 'full' means that 'files'
is complete and all other files should be removed.
'cleanp2' is a set of the filenames that are unchanged from p2
(only in the common merge case where there two parents).
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.
Return a pair (tag_revision, tag_parent_revision), or (None, None)
if nothing was changed.
"""
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"""
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.
"""
def before(self):
pass
def after(self):
pass
def putbookmarks(self, bookmarks):
"""Put bookmarks into sink.
bookmarks: {bookmarkname: sink_rev_id, ...}
where bookmarkname is an UTF-8 string.
"""
def hascommitfrommap(self, rev):
"""Return False if a rev mentioned in a filemap is known to not be
present."""
raise NotImplementedError
def hascommitforsplicemap(self, rev):
"""This method is for the special needs for splicemap handling and not
for general use. Returns True if the sink contains rev, aborts on some
special cases."""
raise NotImplementedError
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):
kwargs = pycompat.byteskwargs(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 = [procutil.shellquote(arg) for arg in cmdline]
if not self.ui.debugflag:
cmdline += ['2>', pycompat.bytestr(os.devnull)]
cmdline = ' '.join(cmdline)
return cmdline
def _run(self, cmd, *args, **kwargs):
def popen(cmdline):
p = subprocess.Popen(procutil.tonativestr(cmdline),
shell=True, bufsize=-1,
close_fds=procutil.closefds,
stdout=subprocess.PIPE)
return p
return self._dorun(popen, cmd, *args, **kwargs)
def _run2(self, cmd, *args, **kwargs):
return self._dorun(procutil.popen2, cmd, *args, **kwargs)
def _run3(self, cmd, *args, **kwargs):
return self._dorun(procutil.popen3, cmd, *args, **kwargs)
def _dorun(self, openfunc, cmd, *args, **kwargs):
cmdline = self._cmdline(cmd, *args, **kwargs)
self.ui.debug('running: %s\n' % (cmdline,))
self.prerun()
try:
return openfunc(cmdline)
finally:
self.postrun()
def run(self, cmd, *args, **kwargs):
p = self._run(cmd, *args, **kwargs)
output = p.communicate()[0]
self.ui.debug(output)
return output, p.returncode
def runlines(self, cmd, *args, **kwargs):
p = self._run(cmd, *args, **kwargs)
output = p.stdout.readlines()
p.wait()
self.ui.debug(''.join(output))
return output, p.returncode
def checkexit(self, status, output=''):
if status:
if output:
self.ui.warn(_('%s error:\n') % self.command)
self.ui.warn(output)
msg = procutil.explainexit(status)
raise error.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
@propertycache
def argmax(self):
# POSIX requires at least 4096 bytes for ARG_MAX
argmax = 4096
try:
argmax = os.sysconf(r"SC_ARG_MAX")
except (AttributeError, ValueError):
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).
return argmax // 2 - 1
def _limit_arglist(self, arglist, cmd, *args, **kwargs):
cmdlen = len(self._cmdline(cmd, *args, **kwargs))
limit = self.argmax - cmdlen
numbytes = 0
fl = []
for fn in arglist:
b = len(fn) + 3
if numbytes + b < limit or len(fl) == 0:
fl.append(fn)
numbytes += b
else:
yield fl
fl = [fn]
numbytes = 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, 'rb')
except IOError as err:
if err.errno != errno.ENOENT:
raise
return
for i, line in enumerate(util.iterfile(fp)):
line = line.splitlines()[0].rstrip()
if not line:
# Ignore blank lines
continue
try:
key, value = line.rsplit(' ', 1)
except ValueError:
raise error.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, 'ab')
except IOError as err:
raise error.Abort(
_('could not open map file %r: %s') %
(self.path, encoding.strtolocal(err.strerror)))
self.fp.write(util.tonativeeol('%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
def makedatetimestamp(t):
"""Like dateutil.makedate() but for time t instead of current time"""
delta = (datetime.datetime.utcfromtimestamp(t) -
datetime.datetime.fromtimestamp(t))
tz = delta.days * 86400 + delta.seconds
return t, tz