gzip: use the stdlib version with python 3 (issue6284)

It turned out that the stdlib gained the feature we missed in python 3.1. We can
now use it directly.

mercurial/archival.py

@@ -1,388 +1,390 b''
 # archival.py - revision archival for mercurial
 #
 # Copyright 2006 Vadim Gelfer <[e-mail]>
 #
 # 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 gzip
 import os
 import struct
 import tarfile
 import time
 import zipfile
 import zlib
 
 from .i18n import _
 from .node import nullrev
 from .pycompat import open
 
 from . import (
     error,
     formatter,
     match as matchmod,
     pycompat,
     scmutil,
     util,
     vfs as vfsmod,
 )
 
 stringio = util.stringio
 
 # from unzip source code:
 _UNX_IFREG = 0x8000
 _UNX_IFLNK = 0xA000
 
 
 def tidyprefix(dest, kind, prefix):
     '''choose prefix to use for names in archive.  make sure prefix is
     safe for consumers.'''
 
     if prefix:
         prefix = util.normpath(prefix)
     else:
         if not isinstance(dest, bytes):
             raise ValueError(b'dest must be string if no prefix')
         prefix = os.path.basename(dest)
         lower = prefix.lower()
         for sfx in exts.get(kind, []):
             if lower.endswith(sfx):
                 prefix = prefix[: -len(sfx)]
                 break
     lpfx = os.path.normpath(util.localpath(prefix))
     prefix = util.pconvert(lpfx)
     if not prefix.endswith(b'/'):
         prefix += b'/'
     # Drop the leading '.' path component if present, so Windows can read the
     # zip files (issue4634)
     if prefix.startswith(b'./'):
         prefix = prefix[2:]
     if prefix.startswith(b'../') or os.path.isabs(lpfx) or b'/../' in prefix:
         raise error.Abort(_(b'archive prefix contains illegal components'))
     return prefix
 
 
 exts = {
     b'tar': [b'.tar'],
     b'tbz2': [b'.tbz2', b'.tar.bz2'],
     b'tgz': [b'.tgz', b'.tar.gz'],
     b'zip': [b'.zip'],
     b'txz': [b'.txz', b'.tar.xz'],
 }
 
 
 def guesskind(dest):
     for kind, extensions in pycompat.iteritems(exts):
         if any(dest.endswith(ext) for ext in extensions):
             return kind
     return None
 
 
 def _rootctx(repo):
     # repo[0] may be hidden
     for rev in repo:
         return repo[rev]
     return repo[nullrev]
 
 
 # {tags} on ctx includes local tags and 'tip', with no current way to limit
 # that to global tags.  Therefore, use {latesttag} as a substitute when
 # the distance is 0, since that will be the list of global tags on ctx.
 _defaultmetatemplate = br'''
 repo: {root}
 node: {ifcontains(rev, revset("wdir()"), "{p1node}{dirty}", "{node}")}
 branch: {branch|utf8}
 {ifeq(latesttagdistance, 0, join(latesttag % "tag: {tag}", "\n"),
       separate("\n",
                join(latesttag % "latesttag: {tag}", "\n"),
                "latesttagdistance: {latesttagdistance}",
                "changessincelatesttag: {changessincelatesttag}"))}
 '''[
     1:
 ]  # drop leading '\n'
 
 
 def buildmetadata(ctx):
     '''build content of .hg_archival.txt'''
     repo = ctx.repo()
 
     opts = {
         b'template': repo.ui.config(
             b'experimental', b'archivemetatemplate', _defaultmetatemplate
         )
     }
 
     out = util.stringio()
 
     fm = formatter.formatter(repo.ui, out, b'archive', opts)
     fm.startitem()
     fm.context(ctx=ctx)
     fm.data(root=_rootctx(repo).hex())
 
     if ctx.rev() is None:
         dirty = b''
         if ctx.dirty(missing=True):
             dirty = b'+'
         fm.data(dirty=dirty)
     fm.end()
 
     return out.getvalue()
 
 
 class tarit(object):
     '''write archive to tar file or stream.  can write uncompressed,
     or compress with gzip or bzip2.'''
 
-    if True:
+    if pycompat.ispy3:
+        GzipFileWithTime = gzip.GzipFile  # camelcase-required
+    else:
 
         class GzipFileWithTime(gzip.GzipFile):
             def __init__(self, *args, **kw):
                 timestamp = None
                 if 'mtime' in kw:
                     timestamp = kw.pop('mtime')
                 if timestamp is None:
                     self.timestamp = time.time()
                 else:
                     self.timestamp = timestamp
                 gzip.GzipFile.__init__(self, *args, **kw)
 
             def _write_gzip_header(self):
                 self.fileobj.write(b'\037\213')  # magic header
                 self.fileobj.write(b'\010')  # compression method
                 fname = self.name
                 if fname and fname.endswith(b'.gz'):
                     fname = fname[:-3]
                 flags = 0
                 if fname:
                     flags = gzip.FNAME  # pytype: disable=module-attr
                 self.fileobj.write(pycompat.bytechr(flags))
                 gzip.write32u(  # pytype: disable=module-attr
                     self.fileobj, int(self.timestamp)
                 )
                 self.fileobj.write(b'\002')
                 self.fileobj.write(b'\377')
                 if fname:
                     self.fileobj.write(fname + b'\000')
 
     def __init__(self, dest, mtime, kind=b''):
         self.mtime = mtime
         self.fileobj = None
 
         def taropen(mode, name=b'', fileobj=None):
             if kind == b'gz':
                 mode = mode[0:1]
                 if not fileobj:
                     fileobj = open(name, mode + b'b')
                 gzfileobj = self.GzipFileWithTime(
                     name,
                     pycompat.sysstr(mode + b'b'),
                     zlib.Z_BEST_COMPRESSION,
                     fileobj,
                     mtime=mtime,
                 )
                 self.fileobj = gzfileobj
                 return tarfile.TarFile.taropen(  # pytype: disable=attribute-error
                     name, pycompat.sysstr(mode), gzfileobj
                 )
             else:
                 return tarfile.open(name, pycompat.sysstr(mode + kind), fileobj)
 
         if isinstance(dest, bytes):
             self.z = taropen(b'w:', name=dest)
         else:
             self.z = taropen(b'w|', fileobj=dest)
 
     def addfile(self, name, mode, islink, data):
         name = pycompat.fsdecode(name)
         i = tarfile.TarInfo(name)
         i.mtime = self.mtime
         i.size = len(data)
         if islink:
             i.type = tarfile.SYMTYPE
             i.mode = 0o777
             i.linkname = pycompat.fsdecode(data)
             data = None
             i.size = 0
         else:
             i.mode = mode
             data = stringio(data)
         self.z.addfile(i, data)
 
     def done(self):
         self.z.close()
         if self.fileobj:
             self.fileobj.close()
 
 
 class zipit(object):
     '''write archive to zip file or stream.  can write uncompressed,
     or compressed with deflate.'''
 
     def __init__(self, dest, mtime, compress=True):
         if isinstance(dest, bytes):
             dest = pycompat.fsdecode(dest)
         self.z = zipfile.ZipFile(
             dest, 'w', compress and zipfile.ZIP_DEFLATED or zipfile.ZIP_STORED
         )
 
         # Python's zipfile module emits deprecation warnings if we try
         # to store files with a date before 1980.
         epoch = 315532800  # calendar.timegm((1980, 1, 1, 0, 0, 0, 1, 1, 0))
         if mtime < epoch:
             mtime = epoch
 
         self.mtime = mtime
         self.date_time = time.gmtime(mtime)[:6]
 
     def addfile(self, name, mode, islink, data):
         i = zipfile.ZipInfo(pycompat.fsdecode(name), self.date_time)
         i.compress_type = self.z.compression  # pytype: disable=attribute-error
         # unzip will not honor unix file modes unless file creator is
         # set to unix (id 3).
         i.create_system = 3
         ftype = _UNX_IFREG
         if islink:
             mode = 0o777
             ftype = _UNX_IFLNK
         i.external_attr = (mode | ftype) << 16
         # add "extended-timestamp" extra block, because zip archives
         # without this will be extracted with unexpected timestamp,
         # if TZ is not configured as GMT
         i.extra += struct.pack(
             b'<hhBl',
             0x5455,  # block type: "extended-timestamp"
             1 + 4,  # size of this block
             1,  # "modification time is present"
             int(self.mtime),
         )  # last modification (UTC)
         self.z.writestr(i, data)
 
     def done(self):
         self.z.close()
 
 
 class fileit(object):
     '''write archive as files in directory.'''
 
     def __init__(self, name, mtime):
         self.basedir = name
         self.opener = vfsmod.vfs(self.basedir)
         self.mtime = mtime
 
     def addfile(self, name, mode, islink, data):
         if islink:
             self.opener.symlink(data, name)
             return
         f = self.opener(name, b"w", atomictemp=False)
         f.write(data)
         f.close()
         destfile = os.path.join(self.basedir, name)
         os.chmod(destfile, mode)
         if self.mtime is not None:
             os.utime(destfile, (self.mtime, self.mtime))
 
     def done(self):
         pass
 
 
 archivers = {
     b'files': fileit,
     b'tar': tarit,
     b'tbz2': lambda name, mtime: tarit(name, mtime, b'bz2'),
     b'tgz': lambda name, mtime: tarit(name, mtime, b'gz'),
     b'txz': lambda name, mtime: tarit(name, mtime, b'xz'),
     b'uzip': lambda name, mtime: zipit(name, mtime, False),
     b'zip': zipit,
 }
 
 
 def archive(
     repo,
     dest,
     node,
     kind,
     decode=True,
     match=None,
     prefix=b'',
     mtime=None,
     subrepos=False,
 ):
     '''create archive of repo as it was at node.
 
     dest can be name of directory, name of archive file, or file
     object to write archive to.
 
     kind is type of archive to create.
 
     decode tells whether to put files through decode filters from
     hgrc.
 
     match is a matcher to filter names of files to write to archive.
 
     prefix is name of path to put before every archive member.
 
     mtime is the modified time, in seconds, or None to use the changeset time.
 
     subrepos tells whether to include subrepos.
     '''
 
     if kind == b'txz' and not pycompat.ispy3:
         raise error.Abort(_(b'xz compression is only available in Python 3'))
 
     if kind == b'files':
         if prefix:
             raise error.Abort(_(b'cannot give prefix when archiving to files'))
     else:
         prefix = tidyprefix(dest, kind, prefix)
 
     def write(name, mode, islink, getdata):
         data = getdata()
         if decode:
             data = repo.wwritedata(name, data)
         archiver.addfile(prefix + name, mode, islink, data)
 
     if kind not in archivers:
         raise error.Abort(_(b"unknown archive type '%s'") % kind)
 
     ctx = repo[node]
     archiver = archivers[kind](dest, mtime or ctx.date()[0])
 
     if not match:
         match = scmutil.matchall(repo)
 
     if repo.ui.configbool(b"ui", b"archivemeta"):
         name = b'.hg_archival.txt'
         if match(name):
             write(name, 0o644, False, lambda: buildmetadata(ctx))
 
     files = [f for f in ctx.manifest().matches(match)]
     total = len(files)
     if total:
         files.sort()
         scmutil.prefetchfiles(
             repo, [ctx.rev()], scmutil.matchfiles(repo, files)
         )
         progress = repo.ui.makeprogress(
             _(b'archiving'), unit=_(b'files'), total=total
         )
         progress.update(0)
         for f in files:
             ff = ctx.flags(f)
             write(f, b'x' in ff and 0o755 or 0o644, b'l' in ff, ctx[f].data)
             progress.increment(item=f)
         progress.complete()
 
     if subrepos:
         for subpath in sorted(ctx.substate):
             sub = ctx.workingsub(subpath)
             submatch = matchmod.subdirmatcher(subpath, match)
             subprefix = prefix + subpath + b'/'
             total += sub.archive(archiver, subprefix, submatch, decode)
 
     if total == 0:
         raise error.Abort(_(b'no files match the archive pattern'))
 
     archiver.done()
     return total