From e4cf0358a216b41108c7a3e055111a3bb517d92e Mon Sep 17 00:00:00 2001
From: Michael Prokop <mika@grml.org>
Date: Thu, 18 Aug 2011 18:10:09 +0200
Subject: [PATCH] 90-update-alternatives: check for available alternatives
 before setting them.

The binaries aren't necessarily available for update-alternatives even
though the binary themselves are present. Therefore execute
update-alternatives using the --list option and check whether the
preferred binary is available before setting it.
---
 .../config/scripts/GRMLBASE/90-update-alternatives | 47 +++++++++++++---------
 1 file changed, 29 insertions(+), 18 deletions(-)

diff --git a/etc/grml/fai/config/scripts/GRMLBASE/90-update-alternatives b/etc/grml/fai/config/scripts/GRMLBASE/90-update-alternatives
index b28abdd..7b541f5 100755
--- a/etc/grml/fai/config/scripts/GRMLBASE/90-update-alternatives
+++ b/etc/grml/fai/config/scripts/GRMLBASE/90-update-alternatives
@@ -9,43 +9,54 @@
 set -u
 set -e
 
-if [ -r $target/usr/bin/vim.basic ] ; then
-  $ROOTCMD update-alternatives --set editor /usr/bin/vim.basic
-  $ROOTCMD update-alternatives --set vi     /usr/bin/vim.basic
-  $ROOTCMD update-alternatives --set vim    /usr/bin/vim.basic
-  $ROOTCMD update-alternatives --set view   /usr/bin/vim.basic
-fi
-
-if [ -r $target/usr/bin/vim.gtk ] ; then
+if $ROOTCMD update-alternatives --list editor 2>/dev/null | grep -q vim.gtk ; then
+  echo "Setting vim.gtk as editor using update-alternatives."
   $ROOTCMD update-alternatives --set editor /usr/bin/vim.gtk
   $ROOTCMD update-alternatives --set vi     /usr/bin/vim.gtk
   $ROOTCMD update-alternatives --set vim    /usr/bin/vim.gtk
   $ROOTCMD update-alternatives --set view   /usr/bin/vim.gtk
+elif $ROOTCMD update-alternatives --list editor 2>/dev/null | grep -q vim.basic ; then
+  echo "Setting vim.basic as editor using update-alternatives."
+  $ROOTCMD update-alternatives --set editor /usr/bin/vim.basic
+  $ROOTCMD update-alternatives --set vi     /usr/bin/vim.basic
+  $ROOTCMD update-alternatives --set vim    /usr/bin/vim.basic
+  $ROOTCMD update-alternatives --set view   /usr/bin/vim.basic
+elif $ROOTCMD update-alternatives --list editor 2>/dev/null | grep -q vim.tiny ; then
+  echo "Setting vim.tiny as editor using update-alternatives."
+  $ROOTCMD update-alternatives --set editor /usr/bin/vim.tiny
+  $ROOTCMD update-alternatives --set vi     /usr/bin/vim.tiny
+  $ROOTCMD update-alternatives --set vim    /usr/bin/vim.tiny
+  $ROOTCMD update-alternatives --set view   /usr/bin/vim.tiny
+else
+  echo "Warning: No vim binary suitable for update-alternatives found."
 fi
 
-if [ -r $target/usr/bin/uxterm ] ; then
+if $ROOTCMD update-alternatives --list x-terminal-emulator 2>/dev/null | grep -q '/uxterm' ; then
+  echo "Setting uxterm as x-terminal-emulator using update-alternatives."
   $ROOTCMD update-alternatives --set x-terminal-emulator /usr/bin/uxterm
-elif [ -r $target/usr/bin/xterm ] ; then
+elif $ROOTCMD update-alternatives --list x-terminal-emulator 2>/dev/null | grep -q '/xterm' ; then
+  echo "Setting xterm as x-terminal-emulator using update-alternatives."
   $ROOTCMD update-alternatives --set x-terminal-emulator /usr/bin/xterm
 fi
 
-if [ -r $target/etc/X11/cursors/whiteglass.theme ] ; then
+if $ROOTCMD update-alternatives --list x-cursor-theme 2>/dev/null | grep -q '/whiteglass.theme' ; then
+  echo "Setting whiteglass.theme as x-cursor-theme using update-alternatives."
   $ROOTCMD update-alternatives --set x-cursor-theme /etc/X11/cursors/whiteglass.theme
 fi
 
-if [ -r $target/usr/bin/iceweasel ] || [ -L $target/usr/bin/iceweasel ] ; then
+if $ROOTCMD update-alternatives --list x-www-browser 2>/dev/null | grep -q '/iceweasel' ; then
+  echo "Setting iceweasel as x-www-browser using update-alternatives."
   $ROOTCMD update-alternatives --set x-www-browser /usr/bin/iceweasel
 fi
 
-if [ -r $target/usr/bin/w3m ] ; then
+if $ROOTCMD update-alternatives --list www-browser 2>/dev/null | grep -q '/w3m' ; then
+  echo "Setting w3m as www-browser using update-alternatives."
   $ROOTCMD update-alternatives --set www-browser /usr/bin/w3m
 fi
 
-if [ -r $target/usr/bin/wm-ng ] ; then
-  # activate wm-ng only if it is registered as x-window-manager:
-  if $ROOTCMD update-alternatives --list x-window-manager | grep -q wm-ng ; then
-    $ROOTCMD update-alternatives --set x-window-manager /usr/bin/wm-ng
-  fi
+if $ROOTCMD update-alternatives --list x-window-manager 2>/dev/null | grep -q '/wm-ng' ; then
+  echo "Setting wm-ng as x-window-manager using update-alternatives."
+  $ROOTCMD update-alternatives --set x-window-manager /usr/bin/wm-ng
 fi
 
 # sadly isn't available via update-alternates, anyway - use
-- 
2.1.4