def _gethash(self, filename, hash):
        """Get file with the provided hash and store it in the local repo's
        store and in the usercache.
        filename is for informational messages only.
        """
        util.makedirs(lfutil.storepath(self.repo, ''))
        storefilename = lfutil.storepath(self.repo, hash)

        tmpname = storefilename + '.tmp'
        tmpfile = util.atomictempfile(
            tmpname, createmode=self.repo.store.createmode)

        try:
            gothash = self._getfile(tmpfile, filename, hash)
        except StoreError as err:
            self.ui.warn(err.longmessage())
            gothash = ""
        tmpfile.close()

        if gothash != hash:
            if gothash != "":
                self.ui.warn(
                    _('%s: data corruption (expected %s, got %s)\n') %
                    (filename, hash, gothash))
            util.unlink(tmpname)
            return False

        util.rename(tmpname, storefilename)
        lfutil.linktousercache(self.repo, hash)
        return True

    def update_parent(path, line, parent):
        line = line - 1 # The line number we're passed will be 1-based
        fp = None

        try:
            fp = open(path)
            data = fp.readlines()
        finally:
            if fp and not fp.closed:
                fp.close()

        #
        # line will be the last line of any continued block, go back
        # to the first removing the continuation as we go.
        #
        while data[line][0].isspace():
            data.pop(line)
            line -= 1

        assert data[line].startswith('default')

        data[line] = "default = %s\n" % parent
        if data[-1] != '\n':
            data.append('\n')

        try:
            fp = util.atomictempfile(path, 'w', 0644)
            fp.writelines(data)
            fp.rename()
        finally:
            if fp and not fp.closed:
                fp.close()

def test3_oops():
    try:
        file = atomictempfile()
    except TypeError:
        print "OK"
    else:
        print "expected TypeError"

def putlfile(repo, proto, sha):
    '''Put a largefile into a repository's local store and into the
    user cache.'''
    proto.redirect()

    path = lfutil.storepath(repo, sha)
    util.makedirs(os.path.dirname(path))
    tmpfp = util.atomictempfile(path, createmode=repo.store.createmode)

    try:
        try:
            proto.getfile(tmpfp)
            tmpfp._fp.seek(0)
            if sha != lfutil.hexsha1(tmpfp._fp):
                raise IOError(0, _('largefile contents do not match hash'))
            tmpfp.close()
            lfutil.linktousercache(repo, sha)
        except IOError, e:
            repo.ui.warn(_('largefiles: failed to put %s into store: %s\n') %
                         (sha, e.strerror))
            return wireproto.pushres(1)
    finally:
        tmpfp.discard()

    return wireproto.pushres(0)

 def removeFile(self, wfile):
     repo = self.repo
     ctx = self.ctx
     if isinstance(ctx, patchctx):
         repo.thgbackup(ctx._path)
         fp = util.atomictempfile(ctx._path, 'wb')
         try:
             if ctx._ph.comments:
                 fp.write('\n'.join(ctx._ph.comments))
                 fp.write('\n\n')
             for file in ctx._fileorder:
                 if file == wfile:
                     continue
                 for chunk in ctx._files[file]:
                     chunk.write(fp)
             fp.close()
         finally:
             del fp
         ctx.invalidate()
     else:
         fullpath = repo.wjoin(wfile)
         repo.thgbackup(fullpath)
         wasadded = wfile in repo[None].added()
         try:
             commands.revert(repo.ui, repo, fullpath, rev='.',
                             no_backup=True)
             if wasadded and os.path.exists(fullpath):
                 os.unlink(fullpath)
         except EnvironmentError:
             qtlib.InfoMsgBox(_("Unable to remove"),
                              _("Unable to remove file %s,\n"
                                "permission denied") %
                                 hglib.tounicode(wfile))
     self.fileModified.emit()

def dump(data, file_path):
    """Serialize some data to a path atomically.

    This is present because I kept corrupting my revmap by managing to hit ^C
    during the serialization of that file.
    """
    f = hgutil.atomictempfile(file_path, 'w+b', 0644)
    json.dump(_convert(data, _scrub), f)
    f.close()

def link(src, dest):
    try:
        util.oslink(src, dest)
    except OSError:
        # if hardlinks fail, fallback on atomic copy
        dst = util.atomictempfile(dest)
        for chunk in util.filechunkiter(open(src, 'rb')):
            dst.write(chunk)
        dst.close()
        os.chmod(dest, os.stat(src).st_mode)

    def test2_discard(self):
        if os.path.exists('foo'):
            os.remove('foo')
        file = atomictempfile('foo')
        (dir, basename) = os.path.split(file._tempname)

        file.write('yo\n')
        file.discard()

        self.assertFalse(os.path.isfile('foo'))
        self.assertTrue(basename not in os.listdir('.'))

def copytostoreabsolute(repo, file, hash):
    if inusercache(repo.ui, hash):
        link(usercachepath(repo.ui, hash), storepath(repo, hash))
    else:
        util.makedirs(os.path.dirname(storepath(repo, hash)))
        with open(file, 'rb') as srcf:
            with util.atomictempfile(storepath(repo, hash),
                                     createmode=repo.store.createmode) as dstf:
                for chunk in util.filechunkiter(srcf):
                    dstf.write(chunk)
        linktousercache(repo, hash)

def copytostoreabsolute(repo, file, hash):
    util.makedirs(os.path.dirname(storepath(repo, hash)))
    if inusercache(repo.ui, hash):
        link(usercachepath(repo.ui, hash), storepath(repo, hash))
    else:
        dst = util.atomictempfile(storepath(repo, hash))
        for chunk in util.filechunkiter(open(file, 'rb')):
            dst.write(chunk)
        dst.close()
        util.copymode(file, storepath(repo, hash))
        linktousercache(repo, hash)

def copytostoreabsolute(repo, file, hash):
    if inusercache(repo.ui, hash):
        link(usercachepath(repo.ui, hash), storepath(repo, hash))
    elif not getattr(repo, "_isconverting", False):
        util.makedirs(os.path.dirname(storepath(repo, hash)))
        dst = util.atomictempfile(storepath(repo, hash),
                                  createmode=repo.store.createmode)
        for chunk in util.filechunkiter(open(file, 'rb')):
            dst.write(chunk)
        dst.close()
        linktousercache(repo, hash)

def test2_discard():
    if os.path.exists('foo'):
        os.remove('foo')
    file = atomictempfile('foo')
    (dir, basename) = os.path.split(file._tempname)

    file.write('yo\n')
    file.discard()

    assert not os.path.isfile('foo')
    assert basename not in os.listdir('.')
    print 'OK'

def link(src, dest):
    """Try to create hardlink - if that fails, efficiently make a copy."""
    util.makedirs(os.path.dirname(dest))
    try:
        util.oslink(src, dest)
    except OSError:
        # if hardlinks fail, fallback on atomic copy
        dst = util.atomictempfile(dest)
        for chunk in util.filechunkiter(open(src, 'rb')):
            dst.write(chunk)
        dst.close()
        os.chmod(dest, os.stat(src).st_mode)

def writefile(config, path):
    """Write the given config obj to the specified file"""
    f = util.atomictempfile(os.path.realpath(path), 'w')
    try:
        buf = cStringIO.StringIO()
        config.write(buf)
        # normalize line endings
        for line in buf.getvalue().splitlines():
            f.write(line + '\n')
        f.close()
    finally:
        del f  # unlink temp file

    def test1_simple(self):
        if os.path.exists('foo'):
            os.remove('foo')
        file = atomictempfile('foo')
        (dir, basename) = os.path.split(file._tempname)
        self.assertFalse(os.path.isfile('foo'))
        self.assertTrue(basename in glob.glob('.foo-*'))

        file.write('argh\n')
        file.close()

        self.assertTrue(os.path.isfile('foo'))
        self.assertTrue(basename not in glob.glob('.foo-*'))

    def get(self, files):
        '''Get the specified largefiles from the store and write to local
        files under repo.root.  files is a list of (filename, hash)
        tuples.  Return (success, missing), lists of files successfully
        downloaded and those not found in the store.  success is a list
        of (filename, hash) tuples; missing is a list of filenames that
        we could not get.  (The detailed error message will already have
        been presented to the user, so missing is just supplied as a
        summary.)'''
        success = []
        missing = []
        ui = self.ui

        util.makedirs(lfutil.storepath(self.repo, ''))

        at = 0
        available = self.exists(set(hash for (_filename, hash) in files))
        for filename, hash in files:
            ui.progress(_('getting largefiles'), at, unit='lfile',
                total=len(files))
            at += 1
            ui.note(_('getting %s:%s\n') % (filename, hash))

            if not available.get(hash):
                ui.warn(_('%s: largefile %s not available from %s\n')
                        % (filename, hash, self.url))
                missing.append(filename)
                continue

            storefilename = lfutil.storepath(self.repo, hash)
            tmpfile = util.atomictempfile(storefilename + '.tmp',
                                          createmode=self.repo.store.createmode)

            try:
                hhash = self._getfile(tmpfile, filename, hash)
            except StoreError, err:
                ui.warn(err.longmessage())
                hhash = ""
            tmpfile.close()

            if hhash != hash:
                if hhash != "":
                    ui.warn(_('%s: data corruption (expected %s, got %s)\n')
                            % (filename, hash, hhash))
                util.unlink(storefilename + '.tmp')
                missing.append(filename)
                continue

            util.rename(storefilename + '.tmp', storefilename)
            lfutil.linktousercache(self.repo, hash)
            success.append((filename, hhash))

def test1_simple():
    if os.path.exists('foo'):
        os.remove('foo')
    file = atomictempfile('foo')
    (dir, basename) = os.path.split(file._tempname)
    assert not os.path.isfile('foo')
    assert basename in glob.glob('.foo-*')

    file.write('argh\n')
    file.close()

    assert os.path.isfile('foo')
    assert basename not in glob.glob('.foo-*')
    print 'OK'

def savepinnednodes(repo, newpin, newunpin, fullargs):
    # take a narrowed lock so it does not affect repo lock
    with extutil.flock(repo.svfs.join('obsinhibit.lock'), 'save pinned nodes'):
        orignodes = loadpinnednodes(repo)
        nodes = set(orignodes)
        nodes |= set(newpin)
        nodes -= set(newunpin)
        with util.atomictempfile(repo.svfs.join('obsinhibit')) as f:
            f.write(''.join(nodes))

        desc = lambda s: [short(n) for n in s]
        repo.ui.log('pinnednodes', 'pinnednodes: %r newpin=%r newunpin=%r '
                    'before=%r after=%r\n', fullargs, desc(newpin),
                    desc(newunpin), desc(orignodes), desc(nodes))

    def _gethash(self, filename, hash):
        """Get file with the provided hash and store it in the local repo's
        store and in the usercache.
        filename is for informational messages only.
        """
        util.makedirs(lfutil.storepath(self.repo, ""))
        storefilename = lfutil.storepath(self.repo, hash)

        tmpname = storefilename + ".tmp"
        tmpfile = util.atomictempfile(tmpname, createmode=self.repo.store.createmode)

        try:
            gothash = self._getfile(tmpfile, filename, hash)
        except StoreError, err:
            self.ui.warn(err.longmessage())
            gothash = ""

    def get(self, files):
        '''Get the specified largefiles from the store and write to local
        files under repo.root.  files is a list of (filename, hash)
        tuples.  Return (success, missing), lists of files successfuly
        downloaded and those not found in the store.  success is a list
        of (filename, hash) tuples; missing is a list of filenames that
        we could not get.  (The detailed error message will already have
        been presented to the user, so missing is just supplied as a
        summary.)'''
        success = []
        missing = []
        ui = self.ui

        at = 0
        for filename, hash in files:
            ui.progress(_('getting largefiles'), at, unit='lfile',
                total=len(files))
            at += 1
            ui.note(_('getting %s:%s\n') % (filename, hash))

            storefilename = lfutil.storepath(self.repo, hash)
            tmpfile = util.atomictempfile(storefilename,
                                          createmode=self.repo.store.createmode)

            try:
                hhash = binascii.hexlify(self._getfile(tmpfile, filename, hash))
            except StoreError, err:
                ui.warn(err.longmessage())
                hhash = ""

            if hhash != hash:
                if hhash != "":
                    ui.warn(_('%s: data corruption (expected %s, got %s)\n')
                            % (filename, hash, hhash))
                tmpfile.discard() # no-op if it's already closed
                missing.append(filename)
                continue

            tmpfile.close()
            lfutil.linktousercache(self.repo, hash)
            success.append((filename, hhash))