[LightDM] New feature: --show-config

[Robert Ancell]

Hi all,

I've just added a new feature to LightDM to show the combined configuration
that it is running. I've found since we've allowed configuration to be
specified in snippets in /etc/lightdm/lightdm.conf,
/etc/lightdm/lightdm.conf.d/*.conf and
/usr/share/lightdm/lightdm.conf.d/*.conf it can be sometimes hard to work
out what configuration you are running with.

So now you can do this:

$ lightdm --show-config
   [SeatDefaults]
A  greeter-wrapper=/usr/lib/lightdm/lightdm-greeter-session
B  guest-wrapper=/usr/lib/lightdm/lightdm-guest-session
C  user-session=ubuntu
D  greeter-session=unity-greeter
E  xserver-command=X -core

Sources:
A  /usr/share/lightdm/lightdm.conf.d/50-greeter-wrapper.conf
B  /usr/share/lightdm/lightdm.conf.d/50-guest-wrapper.conf
C  /usr/share/lightdm/lightdm.conf.d/50-ubuntu.conf
D  /usr/share/lightdm/lightdm.conf.d/50-unity-greeter.conf
E  /usr/share/lightdm/lightdm.conf.d/50-xserver-command.conf

I hope others will find this useful too.

--Robert
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