This is an in-memory backend for the Elixir Logger that can survive reboots.
Install it by adding it to your config.exs:
use Mix.Config
config :logger, backends: [:console, RamoopsLogger]
# The defaults
config :logger, RamoopsLogger,
pmsg_path: "/dev/pmsg1",
recovered_log_path: "/sys/fs/pstore/pmsg-ramoops-1"Or add manually:
iex> Logger.add_backend(RamoopsLogger)
:ok
# Configure only if the defaults don't work on your system
iex> Logger.configure(RamoopsLogger, pmsg_path: "/dev/pmsg1")After a reboot, you can check if a log exists by calling available_log?/0.
Summary
Types
Options for configuring the backend
Functions
Check to see if there a log
Dump the contents of the ramoops pstore file to the console
Read the file contents from the ramoops pstore file. This is useful if you want to pragmatically do something with the file contents, like post to an external server.
Return the path to the recovered log
Types
Options for configuring the backend:
:pmsg_path- Path to pmsg device (default is/dev/pmsg0):recovered_log_path- Path to recovered log files from previous boots (default is/sys/fs/pstore/pmsg-ramoops-0)
These are either specified in the Application config (e.g., config.exs) like
this:
config :logger, RamoopsLogger,
pmsg_path: "/dev/pmsg1",
recovered_log_path: "/sys/fs/pstore/pmsg-ramoops-1"Or configured at runtime like:
iex> Logger.configure(RamoopsLogger, pmsg_path: "/dev/pmsg1")Functions
@spec available_log?() :: boolean()
Check to see if there a log
@spec dump() :: :ok | {:error, File.posix()}
Dump the contents of the ramoops pstore file to the console
@spec read() :: {:ok, binary()} | {:error, File.posix()}
Read the file contents from the ramoops pstore file. This is useful if you want to pragmatically do something with the file contents, like post to an external server.
@spec recovered_log_path() :: Path.t()
Return the path to the recovered log
The path won't exist if there was nothing to recover on boot.