2005-12-21  Brian Cameron  <brian.cameron@sun.com>

        After two months, the redesign of GDM's internal configuration is
        finally reaching a close.  Now GDM users are instructed to not modify
        the gdm.conf file directly and instead put any cutomizations in a
        separate file called gdm.conf-custom (read the comments in both files).
        gdmsetup now modifies the gdm.conf-custom file.  The GDM daemon will
        now use values in gdm.conf-custom first and the default values in
        gdm.conf if no value is defined in gdm.conf-custom.  Benefits:

        1) Now GDM truly supports system-wide and machine-specific config.
           System wide configuration is when the sysadmin wants to share the
           main gdm.conf file across multiple systems on a shared file system
           (possible by building GDM with the --with-configdir option or by
           running GDM with the --config option).  Specific systems can
           override defaults by modifying the gdm.conf-custom file.
        2) Distros can stomp the main gdm.conf file on upgrade knowing that any
           user changes are stored in a separate file.  For best backwards
           compatibility, distros will need to move the gdm.conf file to
           gdm.conf-custom if the gdm.conf file exists on the system but the
           gdm.conf-custom file does not.
        3) Making this work required a lot of cleanup in the way GDM manages
           its configuration files.  For example, now config options are
           managed via access functions, and do not depend on non-static
           globals being shared across files.  The GET_CONFIG and UPDATE_CONFIG
           commands work better and do not require special tweaking when adding
           new config options.  Vicious-extensions is now only included in a
           few files that need to know how to access the config files directly.

        This makes GDM support a popular feature in CDE which works similarly.
        (config files in /etc/dt/config take precidence over the ones in
        /usr/dt/config).

        * daemon/gdmconfig.[ch]: Now supports reading configuration values
          (including "servers" and "server-foo" sections from gdm.conf-custom
          and then from gdm.conf if not found in the custom file.  Now store
          translated strings in a separate hash since this improves
          performance.  Fix GET_SERVER_DETAILS so it works better and
          update config can now update server-foo sections via the
          "xservers/PARMAETERS" key.
        * gui/gdmsetup.c: Now only writes to the gdm.conf-custom file and isa
          smart enough to just delete the key if the value will be the same as
          in the gdm.conf file.  Fixed some core dumping issues caused by my
          change to make gdmsetup use the new gdmconfig functions for getting
          configuration data from the server.  This work cleaned up the code
          quite a bit.  Removed the "--config" option from gdmsetup since this
          change makes it edit the configuration of the running GDM daemon
          instead of a program that edits a particular configuration file.
        * daemon/gdm.h, doc/C/gdm.xml: Updated docs with info about how
          configuration works nwo.  Now sockets protocol info is the same
          in both documents.
        * daemon/gdm.c: Fix GET_SERVER_DETAILS to support "ID" and some
          cleanup.
        * gui/Makefile.am, daemon/Makefile.am: Support --with-configdir option
          which got broken.
        * config/gdm.conf.in: Updated comments to mention that this file is not
          to be edited. Cleaned up the file so it is more readible.
        * config/Makefile.am: Install gdm.conf-custom and move gdm.conf to
          gdm.conf-custom if it is modified and gdm.conf-custom is not already
          installed.  If it is changed and gdm.conf-custom already exists, move
          it to gdm.conf.org.
        * gui/gdmchooser.c, gui/gdmflexiserver.c: Remove unused getting of the
          configuration file.
        * gui/gdmconfig.[ch]: Add function to tell config to never_cache, which
          is needed by gdmsetup.
        * config/gdm.conf-custom: Added template file.