New Features in 0.3.0

• All CommandProtocol drivers support the poll_until_success method.
• The new FileDigitalOutputDriver respresents a digital signal with a file.
• The new GpioDigitalOutputDriver controls the state of a GPIO via the sysfs interface.
• Crossbar and autobahn have been updated to 19.3.3 and 19.3.5 respectively.
• The InfoDriver was removed. The functions have been integrated into the
  labgridhelper library, please use the library for the old functionality.
• labgrid-client write-image subcommand: labgrid client now has a
  write-image command to write images onto block devices.
• labgrid-client ssh now also uses port from NetworkService resource if
  available
• The PLACE and STATE variables used by labgrid-client are replaced by
  LG_PLACE and LG_STATE, the old variables are still supported for the
  time being.
• The SSHDriver's keyfile attribute is now specified relative to the config
  file just like the images are.
• The ShellDriver's keyfile attribute is now specified relative to the config
  file just like the images are.
• labgrid-client -P <PROXY> and the LG_PROXY enviroment variable can be
  used to access the coordinator and network resources via that SSH proxy host.
  Drivers which run commands via SSH to the exporter still connect directly,
  allowing custom configuration in the user's .ssh/config as needed.
  Note that not all drivers have been updated to use the ProxyManager yet.
• Deditec RELAIS8 devices are now supported by the DeditecRelaisDriver.
• The RKUSBDriver was added to support the rockchip serial download mode.
• The USBStorageDriver gained support for BMAP.
• Flashrom support added, by hard-wiring e.g. an exporter to the DUT, the ROM
  on the DUT can be written directly. The flashrom driver implements the
  bootstrap protocol.
• AndroidFastbootDriver now supports 'getvar' and 'oem getenv' subcommands.
• The coordinator now updates the resource acquired state at the exporter.
  Accordingly, the exporter now starts ser2net only when a resources is
  aquired. Furthermore, resource conflicts between places are now detected.
• Labgrid now uses the ProcessWrapper for externally called processes. This
  should include output from these calls better inside the test runs.
• The binding dictionary can now supports type name strings in addition to the
  types themselves, avoiding the need to import a specific protocol or driver
  in some cases.
• The remote infrastructure gained support for place reservations, for further
  information check the section in the documentation.
• The SigrokDriver gained support for the Manson HCS-2302, it allows enabling
  and disabling channels, measurement and setting the current and voltage limit.
• labgrid-client write-image gained new arguments: --partition,
  --skip, --seek.
• Support for Sentry PDUs has been added.
• Strategies now implement a force method, to force a strategy state
  irrespective of the current state.
• SSH Connections can now be proxied over the exporter, used by adding a device
  suffix to the NetworkService address.
• UBootDriver now allows overriding of default boot command (run bootcmd)
  via new boot_command argument.
• The config file supports per-target options, in addition to global options.
• Add power driver to support GEMBIRD SiS-PM implementing SiSPMPowerDriver.
• A cleanup of the cleanup functions was performed, labgrid should now clean up
  after itself and throws an error if the user needs to handle it himself.
• labgrid-client now respects the LG_HOSTNAME and LG_USERNAME
  environment variables to set the hostname and username when accessing
  resources.
• PyVISA support added, allowing to use PyVISA controlled test equipment from
  Labgrid.
• labgrid-client write-image gained a new argument --mode to specify
  which tool should be used to write the image (either dd or bmaptool)
• Exporter configuration file exporter.yaml now allows use of environment
  variables.

Breaking changes in 0.3.0

• ManagedFile now saves the files in a different directory on the exporter.
  Previously /tmp was used, labgrid now uses /var/cache/labgrid.
  A tmpfiles example configuration for systemd is provided in the /contrib
  directory.
  It is also highly recommended to enable fs.protected_regular=1 and
  fs.protected_fifos=1 for kernels>=4.19.
  This requires user intervention after the upgrade to create the directory and
  setup the cleanup job.
• @attr.s(cmp=False) is deprecated and all classes have been moved to
  @attr.s(eq=False), this release requires attrs version 19.2.0
• Coordinator work dir is now set to the same dir as the crossbar configuration
  dir. Hence coordinator specific files like places.yaml and
  resources.yaml are now also stored in the crossbar configuration folder.
  Previously it would use ...
• The HawkbitTestClient and USBStick classes have been removed
• The original USBStorageDriver was removed, NetworkUSBStorageDriver was
  renamed to USBStorageDriver.
  A deprecated NetworkUSBStorageDriver exists temporarily for compatibility
  reasons.

Known issues in 0.3.0

• There are several reports of sshpass used within the SSHDriver not working
  in call cases or only on the first connection.
• Some client commands return 0 even if the command failed.
• Currently empty passwords are not well supported by the ShellDriver