From 21dcf7e3b14e985ea31030827c6cdba93ebe9739 Mon Sep 17 00:00:00 2001
From: Pratyush Anand <panand@redhat.com>
Date: Fri, 7 Apr 2017 09:47:33 +0530
Subject: [PATCH] kdumpctl: fix status check when CONFIG_CRASH_DUMP is not
 enabled in kernel

When kexec_crash_loaded does not exist, means kdump was not enabled in
kernel we get

$ kdumpctl status
cat: /sys/kernel/kexec_crash_loaded: No such file or directory
/usr/bin/kdumpctl: line 879: [: ==: unary operator expected
Kdump is not operational

After this patch:
$ kdumpctl status
Perhaps CONFIG_CRASH_DUMP is not enabled in kernel
Kdump is not operational

Signed-off-by: Pratyush Anand <panand@redhat.com>
Reviewed-by: Bhupesh Sharma <bhsharma@redhat.com>
Reviewed-by: Xunlei Pang <xlpang@redhat.com>
Acked-by: Dave Young <dyoung@redhat.com>
---
 kdumpctl | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/kdumpctl b/kdumpctl
index 4d68be0..9afce8f 100755
--- a/kdumpctl
+++ b/kdumpctl
@@ -876,6 +876,11 @@ check_current_fadump_status()
 
 check_current_kdump_status()
 {
+	if [ ! -f /sys/kernel/kexec_crash_loaded ];then
+		echo "Perhaps CONFIG_CRASH_DUMP is not enabled in kernel"
+		return 1
+	fi
+
 	rc=`cat /sys/kernel/kexec_crash_loaded`
 	if [ $rc == 1 ]; then
 		return 0