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#1 2009-03-24 23:25:06

jarnos
Member
Registered: 2009-03-22
Posts: 9
Website

Make your session start screen locked in conjunction with autologin from GDM

If you use GDM as login manager (or should I say display manager), administrator has an option to set automatic instant or timed login for a user by gdmsetup. Coupling that with instant screen locking can be a tempting option especially, if hibernation does not work in your system.

In order to make such automatic screen locking work in fresh Xfce 4.6, I added some code to xinitrc script that is run in startup of Xfce session.  (See here http://wiki.xfce.org/tips#how_to_custom … rting_xfce for more about xinitrc.) I noticed that gnome-screensaver daemon has to be launched little bit differently to be instantly usable; later I ended up rewriting the section that starts a screen saver daemon, to make it easier for an administrator or a user to choose preferred screen saver. My script would replace the code that starts screen saver daemon within the if-block in the default xinitrc, such as lines 104-108 in http://svn.xfce.org/index.cgi/xfce/xfce … iew=markup. So here is the new code:

   #### Choose here your preferred screensaver
   ScreenSaverPreference="gnome-screensaver"
       
   # Launch preferred screensaver daemon (if available)
   case $ScreenSaverPreference in
    xscreensaver )
      if test -n "`which xscreensaver 2>/dev/null`"; then
            xscreensaver -no-splash &
      fi
    ;;   
    gnome-screensaver )
      if test -n "`which gnome-screensaver 2>/dev/null`"; then
           gnome-screensaver
           # don't use trailing &; consequently screen can be locked immediately
      fi
    ;;
    # if no daemon was started, hope that xflock4 can handle screen locking some other way
   esac
   
   #### Set this "true", if you want to have screen locked after automatic login 
   LockInAutoLogin="true"
   
   if test "$LockInAutoLogin" = "true"; then
       
       # Test if GDM is running; if it is running, it was used for login?
       if ps -A --format comm | grep "^gdm$"  > /dev/null 2>&1; then
           
           # GDM configuration file is used for checking, if this is an automatic (or timed) login.
           # You can use gdmsetup (as root) to make such settings.
           # Note: Some older versions of GDM use the "gdm.conf" file for configuration.
           gdmconf="/etc/gdm/gdm.conf-custom" 
            if test -e "$gdmconf"; then
             user="`whoami`"  
             tmpconf="`tempfile`"
       
             # remove blanks and comments; convert to lower-case
             sed '/^[[:blank:]]*$/d; /^[[:blank:]]*#/d; s/[[:blank:]][[:blank:]]*#.*//; s/[[:blank:]]//g' \
              "$gdmconf" | tr '[:upper:]' '[:lower:]' > "$tmpconf"  
       
             # If automatic login or timed login is enabled for the current user in
             # the GDM configuration, lock screen.  
                  if test \
              -n "`grep "^automaticloginenable=true$" "$tmpconf"`" \
              -a -n "`grep "^automaticlogin="$user"$" "$tmpconf"`" \
              -o \
              -n "`grep "^timedloginenable=true$" "$tmpconf"`" \
              -a -n "`grep "^timedlogin="$user"$" "$tmpconf"`"
                  then 
                 xflock4                  
             fi
             rm "$tmpconf"
           else 
             # Could not find GDM configuration file; lock anyway
             xflock4
           fi
       fi
   fi

Critique welcome.

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#2 2009-03-27 20:31:08

jarnos
Member
Registered: 2009-03-22
Posts: 9
Website

Re: Make your session start screen locked in conjunction with autologin from GDM

Currently xflock4 is implemented so that if it starts xlock, it will not continue before you unlock desktop. Thus, starting Xfce session will not finish in background. If xflock4 uses xscreensaver or gnome-screensaver, there is no such problem.

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