Python FilePath.realpath方法代码示例

# 需要导入模块: from twisted.python.filepath import FilePath [as 别名]
# 或者: from twisted.python.filepath.FilePath import realpath [as 别名]
    def _get_device_path_virtio_blk(self, volume):
        """
        The virtio_blk driver allows a serial number to be assigned to virtual
        blockdevices.
        OpenStack will set a serial number containing the first 20
        characters of the Cinder block device ID.

        This was introduced in
        * https://github.com/openstack/nova/commit/3a47c02c58cefed0e230190b4bcef14527c82709  # noqa
        * https://bugs.launchpad.net/nova/+bug/1004328

        The udev daemon will read the serial number and create a
        symlink to the canonical virtio_blk device path.

        We do this because libvirt does not return the correct device path when
        additional disks have been attached using a client other than
        cinder. This is expected behaviour within Cinder and libvirt See
        https://bugs.launchpad.net/cinder/+bug/1387945 and
        http://libvirt.org/formatdomain.html#elementsDisks (target section)

        :param volume: The Cinder ``Volume`` which is attached.
        :returns: ``FilePath`` of the device created by the virtio_blk
            driver.
        """
        expected_path = FilePath(
            "/dev/disk/by-id/virtio-{}".format(volume.id[:20])
        )
        if expected_path.exists():
            return expected_path.realpath()
        else:
            raise UnattachedVolume(volume.id)

# 需要导入模块: from twisted.python.filepath import FilePath [as 别名]
# 或者: from twisted.python.filepath.FilePath import realpath [as 别名]
    def _get_device_path_virtio_blk(self, volume):
        """
        The virtio_blk driver allows a serial number to be assigned to virtual
        blockdevices.
        OpenStack will set a serial number containing the first 20
        characters of the Cinder block device ID.

        This was introduced in
        * https://github.com/openstack/nova/commit/3a47c02c58cefed0e230190b4bcef14527c82709  # noqa
        * https://bugs.launchpad.net/nova/+bug/1004328

        The udev daemon will read the serial number and create a
        symlink to the canonical virtio_blk device path.

        We do this because libvirt does not return the correct device path when
        additional disks have been attached using a client other than
        cinder. This is expected behaviour within Cinder and libvirt See
        https://bugs.launchpad.net/cinder/+bug/1387945 and
        http://libvirt.org/formatdomain.html#elementsDisks (target section)

        :param volume: The Cinder ``Volume`` which is attached.
        :returns: ``FilePath`` of the device created by the virtio_blk
            driver.
        """
        expected_path = FilePath(
            "/dev/disk/by-id/virtio-{}".format(volume.id[:20])
        )
        # Return the real path instead of the symlink to avoid two problems:
        #
        # 1. flocker-dataset-agent mounting volumes before udev has populated
        #    the by-id symlinks.
        # 2. Even if we mount with `/dev/disk/by-id/xxx`, the mounted
        #    filesystems are listed (in e.g. `/proc/mounts`) with the
        #    **target** (i.e. the real path) of the `/dev/disk/by-id/xxx`
        #    symlinks. This confuses flocker-dataset-agent (which assumes path
        #    equality is string equality), causing it to believe that
        #    `/dev/disk/by-id/xxx` has not been mounted, leading it to
        #    repeatedly attempt to mount the device.
        if expected_path.exists():
            return expected_path.realpath()
        else:
            raise UnattachedVolume(volume.id)

# 需要导入模块: from twisted.python.filepath import FilePath [as 别名]
# 或者: from twisted.python.filepath.FilePath import realpath [as 别名]
    def getDirectory(self, path='/'):

        self.fs = yield FilePath(path)

        if not self.fs.getPermissions():
            defer.returnValue(False)

        files = []

        for f in self.fs.listdir():
            if f == '/':
                continue

            fp = path+f
            fs = FilePath(fp)

            # dont follow symlinks
            if fs.realpath().path != fp:
                continue

            perm = None
            isdir = fs.isdir()
            size = fs.getsize()
            modified = datetime.utcfromtimestamp(fs.getModificationTime())

            df = DiscoveredFile(
                resource_id=self.data['resource_id'],
                file_path=path,
                file_name=f,
                file_isdir=isdir,
                file_size=size,
                file_modified=modified,
                file_perm=perm
            )

            print '[%s] LIST %s.' % (self.data['resource_name'], fp if not fp.endswith('.') else fp)
            files.append(df)

        defer.returnValue(files)