NAME

lgagent - ION Load/Go remote agent program

SYNOPSIS

lgagent own_endpoint_ID

DESCRIPTION

ION Load/Go is a system for management of an ION-based network, enabling the execution of ION administrative programs at remote nodes. The system comprises two programs, lgsend and lgagent.

The lgagent task on a given node opens the indicated ION endpoint for bundle reception, receives the extracted payloads of Load/Go bundles sent to it by lgsend as run on one or more remote nodes, and processes those payloads, which are the text of Load/Go source files.

Load/Go source file content is limited to newline-terminated lines of ASCII characters. More specifically, the text of any Load/Go source file is a sequence of line sets of two types: file capsules and directives. Any Load/Go source file may contain any number of file capsules and any number of directives, freely intermingled in any order, but the typical structure of a Load/Go source file is simply a single file capsule followed by a single directive.

When lgagent identifies a file capsule, it copies all of the capsule's text lines to a new file that it creates in the current working directory. When lgagent identifies a directive, it executes the directive by passing the text of the directive to the pseudoshell() function (see platform(3)). lgagent processes the line sets of a Load/Go source file in the order in which they appear in the file, so the text of a directive may reference a file that was created as the result of processing a prior file capsule in the same source file.

EXIT STATUS

"0"

Load/Go remote agent processing has terminated.

FILES

lgfile contains the Load/Go file capsules and directives that are to be processed.

ENVIRONMENT

No environment variables apply.

DIAGNOSTICS

The following diagnostics may be issued to the ion.log log file:

lgagent: can't attach to BP.

Bundle Protocol is not running on this computer. Run bpadmin(1) to start BP.
lgagent: can't open own endpoint.

own_endpoint_ID is not a declared endpoint on the local ION node. Run bpadmin(1) to add it.
lgagent: bundle reception failed.

ION system problem. Investigate and correct before restarting.
lgagent cannot continue.

lgagent processing problem. See earlier diagnostic messages for details. Investigate and correct before restarting.
lgagent: no space for bundle content.

ION system problem: have exhausted available SDR data store reserves.
lgagent: can't receive bundle content.

ION system problem: have exhausted available SDR data store reserves.
lgagent: can't handle bundle delivery.

ION system problem. Investigate and correct before restarting.
lgagent: pseudoshell failed.

Error in directive line, usually an attempt to execute a non-existent administration program (e.g., a misspelled program name). Terminates processing of source file content.

A variety of other diagnostics noting source file parsing problems may also be reported. These errors are non-fatal but they terminate the processing of the source file content from the most recently received bundle.

BUGS

Report bugs to <https://github.com/nasa-jpl/ION-DTN/issues>