NAME

       x2goserver-run-extensions - Run X2Go Server Extensions

SYNOPSIS

       x2goserver-run-extensions <session_id> <modality>

DESCRIPTION

       x2goserver-run-extensions is called from within a number of X2Go Server core scripts.

       WARNING: Do not call it directly unless you really know what you are doing.

       x2goserver-run-extensions executes scripts that have been provided by third-party X2Go extension
       packages.

       What this man page is about is not the script usage itself but the way of how to provide X2Go server
       extensions and features without the need to change the core X2Go server scripts.

MODALITIES

       x2goserver-run-extensions is called with user privileges. As first command line argument the session ID
       and as the second command line argument a so-called modality is provided.

       This modality tells x2goserver-run-extensions at what stage of an X2Go session startup, resumption,
       suspension or termination the calling script currently is at.

       These X2Go Server core scripts currently call x2goserver-run-extensions: x2gostartagent(8),
       x2goruncommand(8), x2goresume-session(8), x2gosuspend-session(8) and x2goterminate-session(8).

       The modality names all refer to a sub-directory of the path:

         <libexecdir>/x2go/extensions

       where <libexecdir> is /usr/libexec/x2go or /usr/lib/x2go on commonly-used GNU/Linux systems.

       In any of these sub-directories third-party X2Go extension packages can place scripts or binaries that
       will then get executed by the core X2Go server commands, either before or after the essential
       functionality (e.g. x2goagent startup, x2goagent suspension, x2goagent resumption, etc.) or on failure of
       that essential functionality.

       The following table shows the available modalities, the calling scripts and the location where to place
       third-party extension scripts:

        CALLING SCRIPT        MODALITY NAMES    EXTENSION SCRIPTS LOCATION
        --------------        ---------------   --------------------------
        x2gostartagent        pre-start         extensions/pre-start.d/
                              post-start        extensions/post-start.d/
                              fail-start        extensions/fail-start.d/
        x2goruncommand        pre-runcommand    extensions/pre-runcommand.d/
                              post-runcommand   extensions/post-runcommand.d/
                              fail-runcommand   extensions/fail-runcommand.d/
        x2goresume-session    pre-resume        extensions/pre-resume.d/
                              post-resume       extensions/post-resume.d/
                              fail-resume       extensions/fail-resume.d/
        x2gosuspend-session   pre-suspend       extensions/pre-suspend.d/
                              post-suspend      extensions/post-suspend.d/
                              fail-suspend      extensions/fail-suspend.d/
        x2goterminate-session pre-terminate     extensions/pre-terminate.d/
                              post-terminate    extensions/post-terminate.d/
                              fail-terminate    extensions/fail-terminate.d/

       IMPORTANT:
              When  providing  X2Go  Server  extensions  by  this  mechanism,  please pretty well make sure that
              extension scripts you place in either of the above folders do under no  circumstance  fail  during
              execution. Return codes are ignored and failures are therefore not (yet) propagated.

EXECUTION OF EXTENSIONS

       Scripts  (or  binaries)  that have been placed into one of the pre/post/fail modality folders (see above)
       are executed in alpha-numerical sorting order.

       Extensions will only get executed if their file names start with three digits followed by  an  underscore
       character.   This  restriction  is  in place to make sure that X2Go Server extensions get executed in the
       correct/wanted order:

       For example:
         010_x2goserver-statistics
         020_x2goserver-mail-notify
         021_x2goserver-monitoring
         etc. pp.

RETURN VALUES

       x2goserver-run-extensions always returns 0 as exit code and pretends to be permanently happy :-).

SEE ALSO

       x2gostartagent(8), x2goruncommand(8), x2goresume-session(8),  x2gosuspend-session(8)  and  x2goterminate-
       session(8).

AUTHOR

       This  manual  has  been  written  by Mike Gabriel <mike.gabriel@das-netzwerkteam.de> for the X2Go project
       (https://www.x2go.org).

Version 4.1.0.6                                     Aug 2023                        x2goserver-run-extensions(8)