From f7942b97a5f8de2a2a8f167cd0399bf9b55f3bc8 Mon Sep 17 00:00:00 2001
From: ste-fan <s.t.e-f.a.n@web.de>
Date: Thu, 18 Jun 2015 16:32:22 +0200
Subject: [PATCH] Fix relative path detection of ISO files

The problem becomes apparent when using symbolic links in $ISO_LOCATION
that point to ISO files on another partition.

Calling make_system_path_relative_to_its_root not on the dirname but on
the ISO file fixes this. Also avoid a double slash (//...) in $iso_path
when $rel_dirname is just the root dir of that other partition (/).
---
 42_grml | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/42_grml b/42_grml
index 8cfdb3f..96e5e1f 100755
--- a/42_grml
+++ b/42_grml
@@ -87,7 +87,7 @@ for file in "${ISO_LOCATION}"/*.iso ; do
 done
 
 for grmliso in $iso_list ; do
-  rel_dirname="$(make_system_path_relative_to_its_root $(dirname $grmliso))"
+  rel_dirname="$(dirname $(make_system_path_relative_to_its_root $grmliso))"
   grml="$(basename $grmliso)"
   device="$(${grub_probe} -t device ${grmliso})"
 
@@ -112,11 +112,11 @@ for grmliso in $iso_list ; do
   cat << EOF
 menuentry "${title}" {
 ${grub_prep}
-        iso_path="${rel_dirname}/${grml}"
+        iso_path="${rel_dirname%/}/${grml}"
         export iso_path
         kernelopts=" $CUSTOM_BOOTOPTIONS $additional_param "
         export kernelopts
-        loopback loop "${rel_dirname}/$grml"
+        loopback loop "${rel_dirname%/}/$grml"
         set root=(loop)
         configfile /boot/grub/loopback.cfg
 }
-- 
2.1.4