/etc/X11/window-managers (was Re: DEBIAN POLICY WEEKLY, #4 (October 23, 1997))
Christian Schwarz <firstname.lastname@example.org> writes:
> Topic 12: X Window Manager policy
> STATE: INPUT
> Joey Hess wrote on Mon, 30 Jun 1997 to debian-devel:
> I maintain KDE, which includes a window manager, and I've been wondering how
> other window managers handle registering themselves in
> /etc/X11/window-managers. So I took a look at all th window managers.
> Some window managers add themselves to the top of the file, so they become the
> default window manager. Others add themselves to the bottom of the file, so
> the sysadmin doesn't get a chance to use them as a default window manager
> without editing the file. And many window managers don't add themselves to the
> file at all.
> Here's a survey I did:
> window manager adds itself to /etc/X11/window-managers how
> -------------- -------------------------------------------
> kde adds to bottom
> afterstep adds to bottom
> fvwm doesn't do so
> fvwm2 doesn't seem to do so (complex postinst, I just grepped it
> fvwm95 adds to top
> gwm doesn't do so
> 9wm doesn't do so
> ctwm doesn't do so
> wm2 doesn't do so
> wmaker doesn't do so
> olvwm if olvwm entry not already present, prompt to make
> default window manager or not, insert line in appropriate
> I think olvwm's behavior is the best of the lot, since it gives the sysadmin
> a choice (and only asks once, not during upgrades, which is also very good
> behavior). I wonder if it'd be a good idea for one of the X packages to
> include a register-window-manager script that could be called from the
> postinst's to handle this, so all window managers functioned exactly alike?
> Linh Dang suggested:
> Why not make /etc/X11/window-managers a directory which contains scripts for
> windows managers. Change /etc/X11/Xsession to start
> /etc/X11/window-managers/default (which is a symlink). A fvwm script should
> looks like:
> exec fvwm -F /etc/X11/fvwm/system.fvwmrc
> I'd prefer Joey's solution: xbase should install a script `install-wm' (or
> similar) which is called by all window manager's postinst scripts. The
> `install-wm' script will ask the sysadmin where to place the new wm (top or
> bottom of the file).
> Any other ideas?
I've changed fvwm2 to do the same as olvmw, ie ask where to put it.
If someone does an "install-wm" script, they could life the code I
# add ourselves to /etc/X11/window-managers it we're not in it already
open(F, "<$WINMGRS") || die "Couldn't open $WINMGRS for read: $!\n";
@file = <F>;
@ret = grep(m!^/usr/X11R6/bin/fvwm2$!, @file);
&addWM("fvwm2", "/usr/X11R6/bin/fvwm2") if ($#ret == -1);
# add the line "$full" to /etc/X11/window-managers. This assumes it's
# not already there. Prompts asking whether "$short" should be made
# the default.
local ($short, $full) = @_;
local ($reply, $incomment, $placed);
print "Should I make $short the default window manager? [Y/n] ";
$reply = <STDIN>;
$reply = "y" if ($reply eq "");
$reply =~ tr/A-Z/a-z/;
$reply = substr($reply, 0, 1); # only first char counts
print "Please anwser 'y' or 'n'\n"
if ($reply ne "y" && $reply ne "n");
} until ($reply eq "y" || $reply eq "n");
open(F, "<$WINMGRS") || die "Can't open $WINMGRS for read: $!\n";
open(T, ">$WINMGRS.$$") || die "Can't open $WINMGRS.$$ for write: $!\n";
$incomment = 0; # was the prev line a comment line?
$placed = 0; # have we inserted the new line yet?
# skip comments
$incomment = 1;
# should we make the WM the default?
if ($incomment && ! $placed && $reply eq "y")
print T "$full\n";
$placed = 1;
# in any case, put the non-comment line through to the output
$incomment = 0;
# place the WM line if we've got to the end of the file without doing so
print T "$full\n" if (!$placed);
close(F) || die "Error closing $WINMGRS: $!\n";
close(T) || die "Error closing $WINMGRS.$$: $!\n";
# swizzle the new copy into place atomically
rename("$WINMGRS.$$", "$WINMGRS") ||
die "Can't rename $WINMGRS.$$ to $WINMGRS: $!\n";
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