add install-info presence test to install script

grub.install

@@ -1,22 +1,20 @@
-info_dir=/usr/share/info
-info_files=(grub.info multiboot.info)
+infodir=/usr/share/info
+filelist=(grub.info multiboot.info)
 
 post_install() {
-  for f in ${info_files[@]}; do
-    install-info ${info_dir}/$f.gz ${info_dir}/dir 2> /dev/null
+  [ -x usr/bin/install-info ] || return 0
+  for file in ${filelist[@]}; do
+    install-info $infodir/$file.gz $infodir/dir 2> /dev/null
   done
 }
 
 post_upgrade() {
-        post_install
+  post_install $1
 }
 
 pre_remove() {
-  for f in ${info_files[@]}; do
-    install-info --delete ${info_dir}/$f.gz ${info_dir}/dir 2> /dev/null
+  [ -x usr/bin/install-info ] || return 0
+  for file in ${filelist[@]}; do
+    install-info --delete $infodir/$file.gz $infodir/dir 2> /dev/null
   done
 }
-
-
-
-