Shell

SeedStack shell add-on provides access to application administrative commands through SSH protocol.

It works in two different modes:

  • Interactive mode consists in providing of a simple line-based shell with auto-completion, history and the ability to display command results as a string. In this mode, commands have no access to low-level input, output and error streams. They take and produce discrete objects that are displayed as strings.
  • Direct mode consists of a single command executed through an ssh remote invocation. In this mode, commands have access to low-level input, output and error streams and thus can be combined with other commands on the client system.

While the SSH protocol is used by this add-on, please note that it can only access to internal application commands. No system access is possible from this shell.

Dependency

<dependency>
    <groupId>org.seedstack.addons.shell</groupId>
    <artifactId>shell</artifactId>
</dependency>
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dependencies {
    compile("org.seedstack.addons.shell:shell:1.0.1")
}

Configuration

Shell access can be configured with the following options:

shell:
  # If true, shell access will be enabled (defaults to false)
  enabled: (boolean)
  # Port the shell is listening on  (defaults to 2222)
  port: (int)
  # SSH key configuration
  key:
    # The type of the key to use
    type: (GENERATED|FILE|RESOURCE)
    # The location of the key if a file or resource type is used
    location: (String)

To dump the shell configuration options:

mvn -q -Dargs="shell" seedstack:config

Don’t use a generated key in a production environment as this is NOT secured from an SSH perspective.

When the key is stored in a file or a classpath resource location, it must be in a JCE serialized format.

Usage

Use your preferred SSH client to connect to the configured port. All commands registered in the CommandRegistry can be invoked from both interactive and direct modes. You can specify command name, arguments and options using a GNU-like syntax:

[scope:]cmdname -s -sval --long-option --long-option-with-arg=argval arg0 arg1 arg2

Note that:

  • The command scope must be specified as a prefix of the command name, delimited by a colon character.
  • Short options are specified using the dash character (-) immediately followed by the option name and a value if needed.
  • Long options are specified with two dash characters (–) immediately followed by the option name and, if required, an equal sign with a value.
  • Arguments are specified respecting the command arguments order.

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