s390-tools/s390-tools-sles15-zdev-Fix-zdev-dracut-module-aborting-on-unknown-root.patch

From 0348a8443e5f15636f86ef2533a7d6e8fa5d936d Mon Sep 17 00:00:00 2001
From: Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
Date: Thu, 7 Dec 2017 17:21:11 +0100
Subject: [PATCH 4/4] zdev: Fix zdev dracut module aborting on unknown root
 device

Running dracut when the root device is not known to zdev (for example
because it is located on a virtio block device) will cause the zdev
dracut module to incorrectly return an error in the installkernel()
function. As a result dracut aborts with an error.

Fix this by ensuring that the non-zero exit code resulting from lszdev
not being able to determine the root device is not passed on to the
calling function. Also remove unnecessary error output in this case
by leaving the install() function early when the root device is not
known to zdev.

Signed-off-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
---
 zdev/dracut/95zdev/module-setup.sh | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/zdev/dracut/95zdev/module-setup.sh b/zdev/dracut/95zdev/module-setup.sh
index 7c67cd7..4c13a65 100644
--- a/zdev/dracut/95zdev/module-setup.sh
+++ b/zdev/dracut/95zdev/module-setup.sh
@@ -29,13 +29,21 @@ depends() {
 }
 
 installkernel() {
-    local _modules=$(lszdev --by-path / --columns MODULES --no-headings)
+    local _modules=$(lszdev --by-path / --columns MODULES --no-headings 2>/dev/null)
 
+    [ -z "$_modules" ] && return 0
     [ ! -z "$_modules" ] && instmods $_modules
 }
 
 install() {
-    local _tempfile=$(mktemp --tmpdir dracut-zdev.XXXXXX)
+    local _tempfile
+
+    # Exit early if root device type is unknown
+    if ! lszdev --by-path / >/dev/null 2>&1 ; then
+        return 0
+    fi
+
+    _tempfile=$(mktemp --tmpdir dracut-zdev.XXXXXX)
 
     if chzdev --export - --persistent --by-path / >/dev/null 2>&1 ; then
         # Use persistent configuration
-- 
2.13.6