[PATCH kvmtool v3 2/9] update_headers.sh: Cleanly report failure on error

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If in intermediate step fails, update_headers.sh blindly continues
and may return success status.

To avoid errors going unnoticed when driving this script, exit and
report failure status as soon as something goes wrong.  For good
measure, also fail on expansion of undefined shell variables to aid
future maintainers.

Signed-off-by: Dave Martin <Dave.Martin@xxxxxxx>
---
 util/update_headers.sh | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/util/update_headers.sh b/util/update_headers.sh
index 4ba1b9f..a7e21b8 100755
--- a/util/update_headers.sh
+++ b/util/update_headers.sh
@@ -7,6 +7,8 @@
 # using the lib/modules/`uname -r`/source link.
 ########################################################################
 
+set -ue
+
 if [ "$#" -ge 1 ]
 then
 	LINUX_ROOT="$1"
-- 
2.1.4

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