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Files
=====
This directory includes the file required specifically for systemd integration.
This is a work in progress and may change as development progresses.
The following unit files should be installed in /lib/systemd/system or
/etc/systemd/system:
scanbd.service
scanbm@.service
scanbm.socket
The file scanbm@.service.sane-git is a replacement for scanbm@.service for the
case where you use the git version of sane. That has a patch that adds full
systemd support to saned. That will allow you to add SANE_DEBUG_<backendname>
environment variables and use the system log or systemd-journalctl to watch
the debugging outputs. If you want to use it, it needs to be copied to
/lib/systemd/system/scanbm@.service. Systemd socket activation also requires
the patch in scanbd added after release of version 1.3
The following files goes into the dbus services directory
/usr/share/dbus-1/system-services:
de.kmux.scanbd.server.service
Now enable the units:
systemctl enable scanbd.service
systemctl enable scanbm.socket
and start them:
systemctl start scanbd.service
systemctl start scanbm.socket
Background
==========
Systemd setup
-------------
scanbd.service starts scanbd in polling mode to monitor the scanner for
button-presses. It also defines the dbus service that we use to avoid double
activation. The Environment directive allows for specification of the initial
environment. The sample contains the setting of SANE_CONFIG_DIR to point to
my scanbd configuration directory in /etc
Scanbd.socket defines the port for saned.
Scanbm@.service defines the settings for scanbd in manager mode. It gets
activated when an application wants to scan and opens the saned port.
Dbus setup for systemd
----------------------
de.kmux.scanbd.server.service tells dbus that it does not need to start a
process when a message for scanbd is received on the message bus, but that
that responsibility is delegated to systemd.
Please note that the scanbd_dbus.conf still needs to be installed in
/etc/dbus-1/system.d
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