View Source SSHSubsystemFwup (ssh_subsystem_fwup v0.6.2)

SSH subsystem for upgrading Nerves devices

This module provides an SSH subsystem for Erlang's ssh application. This makes it possible to send firmware updates to Nerves devices using plain old ssh like this:

cat $firmware | ssh -s $ip_address fwup

Where $ip_address is the IP address of your Nerves device. Depending on how you have Erlang's ssh application set up, you may need to pass more parameters (like username, port, identities, etc.).

See nerves_ssh for an easy way to set this up. If you don't want to use nerves_ssh, then in your call to :ssh.daemon add the return value from SSHSubsystemFwup.subsystem_spec/1:

devpath = Nerves.Runtime.KV.get("nerves_fw_devpath")

:ssh.daemon([
      {:subsystems, [SSHSubsystemFwup.subsystem_spec(devpath: devpath)]}
    ])

See SSHSubsystemFwup.subsystem_spec/1 for options. You will almost always need to pass the path to the device that should be updated since that is device-specific.

Summary

Types

Options

Functions

Helper for creating the SSH subsystem spec

Types

@type options() :: [
  devpath: Path.t(),
  fwup_path: Path.t(),
  fwup_env: [{String.t(), String.t()}],
  fwup_extra_options: [String.t()],
  precheck_callback: mfargs() | nil,
  task: String.t(),
  success_callback: mfargs()
]

Options:

  • :devpath - path for fwup to upgrade (Required)
  • :fwup_path - path to the fwup firmware update utility
  • :fwup_env - a list of name,value tuples to be passed to the OS environment for fwup
  • :fwup_extra_options - additional options to pass to fwup like for setting public keys
  • :precheck_callback - an MFArgs to call when there's a connection. If specified, the callback will be passed the username and the current set of options. If allowed, it should return {:ok, new_options}. Any other return value closes the connection.
  • :success_callback - an MFArgs to call when a firmware update completes successfully. Defaults to {Nerves.Runtime, :reboot, []}.
  • :task - the task to run in the firmware update. Defaults to "upgrade"

Functions

Link to this function

subsystem_spec(options \\ [])

View Source
@spec subsystem_spec(options()) :: :ssh.subsystem_spec()

Helper for creating the SSH subsystem spec