From 43819af68c7789ec932c25e699c56889fdf7276c Mon Sep 17 00:00:00 2001

From: Fabian Vogt <fvogt@suse.com>

Date: Thu, 21 Jan 2016 17:13:07 +0100

Subject: [PATCH] Correctly handle module aliases

Handle module aliases correctly to not generate unbootable

initrds with different kernel versions when modules were renamed

or replaced.

Signed-off-by: Fabian Vogt <fvogt@suse.com>

---

 dracut.sh | 21 +++++++++++++++++++++

 1 file changed, 21 insertions(+)

diff --git a/dracut.sh b/dracut.sh

index 98dbe0b..ae8772b 100755

--- a/dracut.sh

+++ b/dracut.sh

@@ -1195,6 +1195,27 @@ if [[ $hostonly ]]; then

     while read m rest || [ -n "$m" ]; do

         host_modules["$m"]=1

     done 

+

+    # Explanation of the following section:

+    # Since kernel 4.4, mpt3sas is a complete replacement for mpt2sas.

+    # mpt3sas has an alias to mpt2sas now, but since mpt3sas isn't loaded

+    # when generating the initrd from kernel < 4.4, it's not included.

+    # The other direction has the same issue:

+    # When generating the initrd from kernel >= 4.4, mpt2sas isn't loaded,

+    # so it's not included.

+    # Both ways result in an unbootable initrd.

+

+    # also add aliases of loaded modules

+    for mod in "${!host_modules[@]}"; do

+        aliases=$(modinfo -F alias "$mod" 2>&1)

+        for alias in $aliases; do

+            host_modules["$alias"]=1

+        done

+        # mod might be an alias in the target kernel, find the real module

+        mod_filename=$(modinfo -k "$kernel" "$mod" -F filename)

+        [ $? -ne 0 ] && continue

+        host_modules["$(basename -s .ko "$mod_filename")"]=1

+    done

 fi

 unset m