Properly boot from mdadm via findiso boot option.

For example grml-rescueboot uses findiso for booting the ISO.
When booting from a software RAID using mdadm then
/scripts/local-top/mdadm being used inside
/scripts/boot/9990-misc-helpers.sh leaks its output to the
environment, causing invalid data used inside the
mount_images_in_directory function. Because the invalid data
results in a failing mount_images_in_directory execution we end
up with failed boot and error message:

  "No supported filesystem images found at ...."

So instead redirect output of /scripts/local-top/mdadm to
/boot.log. Also make sure to check for existence of
/conf/conf.d/md before accessing it (the file doesn't always
exist).

While at it also make sure the same logic is used for
/scripts/local-top/lvm2.

See http://bts.grml.org/grml/issue1270

diff --git a/components/9990-misc-helpers.sh b/components/9990-misc-helpers.sh
index 902ddfe..c656f23 100755 (executable)
--- a/components/9990-misc-helpers.sh
+++ b/components/9990-misc-helpers.sh
@@ -161,7 +161,7 @@ check_dev ()
                                # Adding lvm support
                                if [ -x /scripts/local-top/lvm2 ]
                                then
-                                       ROOT="$device" resume="" /scripts/local-top/lvm2
+                                       ROOT="$device" resume="" /scripts/local-top/lvm2 >>/boot.log
                                fi
                                ;;
 
@@ -169,10 +169,10 @@ check_dev ()
                                # Adding raid support
                                if [ -x /scripts/local-top/mdadm ]
                                then
-                                       cp /conf/conf.d/md /conf/conf.d/md.orig
+                                       [ -r /conf/conf.d/md ] && cp /conf/conf.d/md /conf/conf.d/md.orig
                                        echo "MD_DEVS=$device " >> /conf/conf.d/md
-                                       /scripts/local-top/mdadm
-                                       mv /conf/conf.d/md.orig /conf/conf.d/md
+                                       /scripts/local-top/mdadm >>/boot.log
+                                       [ -r /conf/conf.d/md.orig ] && mv /conf/conf.d/md.orig /conf/conf.d/md
                                fi
                                ;;
                esac