Ubuntu Manpage: console-kit-daemon

NAME

       console-kit-daemon - ConsoleKit daemon

SYNOPSIS

       console-kit-daemon [--debug] [--help] [--no-daemon] [--timed-exit]

DESCRIPTION

console-kit-daemon is a service for defining and tracking users, login sessions and seats.
It provides interfaces for managing switching sessions and session migration when using
mechanisms such as Virtual Terminals (VT). ConsoleKit provides a number of interfaces to
specify what displays are managed by the display manager, and how.

ConsoleKit maintains a database of which users are logged into the system. ConsoleKit
groups sessions by seats which represent a set of hardware (usually a keyboard and mouse).
Other process communicate with ConsoleKit via D-Bus.

One session leader process is responsible for asking console-kit-daemon to open a new
session. In the typical case, the session leader would be a ConsoleKit enabled display
manager, such as GDM. This leader makes a connection to the D-Bus system bus and asks
console-kit-daemon to open a session when needed.

If the operation succeeds, console-kit-daemon will return a cookie to the session leader.
The session leader should store this variable in the environment as XDG_SESSION_COOKIE so
that it may be shared with its child processes. The environment variable contains the
UUID used to tie processes to a session.

At this point the session will be registered with ConsoleKit and a particular set of
information about the session will be stored along with it.

The Session will remain open until the Session Leader disconnects from the D-Bus system
bus. The session will be removed from its seat, and deregistered.

Various other programs need to know information about running user sessions, such as the
Fast User Switch Applet and other mechanisms for switching the console to use a different
VT display. Such programs make use of ConsoleKit interfaces to determine if user
switching is supported and to manage the switching of different sessions on the same seat.

ConsoleKit provides a pam_ck_connector so that non-graphical logins (e.g. telnet, ssh,
etc.) are registered with ConsoleKit. This functionality works if this PAM module is
enabled in the pam.conf(4) configuration. Thus ConsoleKit can be used as a utmp/wtmp
replacement since it stores a superset of the information as in the utmp/wtmp database.

The ConsoleKit database is stored in the file /run/ConsoleKit/database. It stores
information about active Seats, Sessions, and the current SessionLeader.

OPTIONS

       The following options are supported:

       --debug                 Enable debug output.

       -h, --help              Display detailed usage message.

       --no-daemon             Avoid   starting  console-kit-daemon  as  a  daemon.   Useful  for
                               debugging.

       --timed-exit            Exit after 30 seconds.   Useful for debugging.

ENVIRONMENT VARIABLES

See environ(5) for descriptions of environment variables.

DISPLAY

This environment variable corresponds to the Xserver display value associated with the
ConsoleKit session.

XDG_SESSION_COOKIE

ConsoleKit provides this environment variable to the session leader. The session
leader is expected to ensure this is set for the session process started. It contains
a UUID used to tie the processes to the session. This is used to support user
switching on displays that support it (currently only graphical VT displays on the
console).

XDG_RUNTIME_DIR

The XDG_RUNTIME_DIR defines the base directory to which user-specific files and
objects should be stored. The XDG_RUNTIME_DIR is the same for all sessions of the same
user and will be automatically removed once the last session of the user is closed.

The following environment variables are set when console-kit-daemon runs the run-seat.d
scripts. These values correspond to those values returned by the ck-list-session(1)
utility.

CK_SESSION_SEAT_ID

The seat ID associated with the session.

CK_SESSION_SEAT_UID

The user id associated with the session

CK_SESSION_DISPLAY_DEVICE

The display device associated with the session.

CK_SESSION_X11_DISPLAY_DEVICE

The value of the display device that the X11 display for the session is connected to.
If there is no x11-display set, then this value is undefined.

CK_SESSION_X11_DISPLAY

The value of the X11 DISPLAY environment variable for this session if one is present.

CK_SESSION_REMOTE_HOST_NAME

If the session is not local, the value is the host name associated with the session.
If the session is local, the value is empty.

CK_SESSION_IS_ACTIVE

The value is "TRUE" if the session is active on the seat to which it is attached, and
"FALSE" otherwise.

CK_SESSION_IS_LOCAL

The value is "TRUE" if the session is local, and "FALSE" if remote.

CK_SESSION_IS_DYNAMIC

The value is "TRUE" if the session was started with ck-seat-tool, and "FALSE"
otherwise.

EXTENDED DESCRIPTION

ConsoleKit Seat Configuration
ConsoleKit seat configuration files are located in the /etc/ConsoleKit/seats.d directory.
Each seat configuration file ends with the .seat suffix. ConsoleKit provides a default
seat file named 00-primary.seat. Additional seat configuration files may be added. These
files are in standard INI format.

The settings below are in "group/key=default_value" format, and show the default values of
the 00-primary.seat file. For example, to specify a different "Seat Entry/Name" value,
you would modify the this file so it contains these lines:

[Seat Entry]
[...]
Name=Customized seat name

The following keys are supported for configuring ConsoleKit seats:

Seat Entry/Version=1.0

Version number of the seat file. This specifies the version number of the
configuration file format used. Currently only the value "1.0" is supported.

Seat Entry/Name=Primary seat

Name of the seat.

Seat Entry/ID=StaticSeat

Specifies the unique ID of the seat. If the value is NULL, then console-kit-daemon
will provide a value. The ID may only contain the ASCII characters [A-Z][a=z][0-9]_".

Seat Entry/Hidden=false

If this value is set to "false", then ConsoleKit will create this seat. Otherwise,
the seat will not be created.

Seat Entry/Devices

This value is not currently supported. In the future, it is planned that ConsoleKit
will provide the ability to manage how device permissions are managed, and this key is
a placeholder.

Seat Entry/Sessions=Local

List of sessions to start on the seat, separated by the ";" character. Each session
must be defined in a ConsoleKit session configuration file named
/etc/ConsoleKit/sessions.d/sessions.session where sessions is the value of this key.

ConsoleKit Session Configuration
ConsoleKit session configuration files are located in the /etc/ConsoleKit/sessions.d
directory. Each session configuration file ends with the .session suffix. Additional
seat configuration files may be added. These files are in standard INI format.

The settings below are in "group/key" format, so to specify the "Session Entry/Name"
value, the file shoulld contain these lines:

[Session Entry]
[...]
Name=Customized Session

The following keys are supported for configuring ConsoleKit sessions:

Session Entry/Name

Unique name of the session.

Session Entry/Type

Type of the session

Session Entry/Description

Description of the session.

Session Entry/DisplayTemplate

This specifies the display type to be used with the session. This corresponds to the
file /etc/ConsoleKit/displays.d/display_template.display where display_template is the
value of this key.

Local/variable

The ConsoleKit display configuration file associated with the "Entry/DisplayTemplate"
key specifies the command to run to launch the display. This command is defined in
the ConsoleKit display configuration file in the key "X11/Exec". This command can
include variables that begin with the "$" character, such as "$display". The values
to be used for these variables can be defined in this section. So if the session
configuration file contains the value "Local/display=:0", this will cause the variable
used when launching the command to be replaced with the value "0".

ConsoleKit System Restart and Stop
console-kit-daemon provides D-Bus interfaces that will restart or stop the system. When
console-kit-daemon receives a D-Bus request to restart the system, it will run the
/usr/lib/ConsoleKit/scripts/ck-system-restart script if the user has privilege to do this
operation. When console-kit-daemon receives a D-Bus request to stop the system, it will
run the /usr/lib/ConsoleKit/scripts/ck-system-stop script if the user has privilege to do
this operation.

EXAMPLES

       Example 1: To start the ConsoleKit daemon

       example% console-kit-daemon

       Example 2: To configure ConsoleKit to start multiple sessions on a single seat

       To  start  two  local  displays:  DISPLAY  ":0" on vt7 and DISPLAY ":1" on "vt8", edit the
       00-primary.seat file as follows:

       [Seat Entry]
       Version=1.0
       Name=Primary seat
       Description=start static displays :0 on vt7 and :1 on vt8
       Hidden=false
       Devices=
       Sessions=Local;Local2;

       Then, in addition to the original /etc/ConsoleKit/sessions.d/Local.session file,  add  the
       following /etc/ConsoleKit/sessions.d/Local2.session file:

       [Session Entry]
       Name=Local
       Type=LoginWindow
       Description=Local Login Screen
       DisplayTemplate=Local

       [Local]
       display=:1
       vt=/dev/vt/8

NOTES

       Brian Cameron, Sun Microsystems Inc., 2009.  Copyright (c) 2009 by Sun Microsystems, Inc.

       Some of the documentation in this manpage is from the ConsoleKit documentation written  by
       William Jon McCann.