[PATCH v4] kdumpctl: Error out in case there are white spaces before an option name

[Bhupesh Sharma]

Resolves: BZ1484945
https://bugzilla.redhat.com/show_bug.cgi?id=1484945

Currently the kdumpctl script doesn't handle
whitespaces (including TABs) which might be there before
an option name in the kdump.conf

This patch addresses this issue, by ensuring that the
kdumpctl errors out in case it finds any stray space(s)
or tab(s) before a option name.

Reported-by: Kenneth D'souza 
Signed-off-by: Bhupesh Sharma 
---
Changes since v3:
 - Made the check simpler by using grep -E instead of awk

kdumpctl | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/kdumpctl b/kdumpctl
index b7a3105026eb..b56d824147b4 100755
--- a/kdumpctl
+++ b/kdumpctl
@@ -406,6 +406,13 @@ check_config()
    	return 1
    }

+	# Check if we have any leading spaces (or tabs) before the
+	# variable name in the kdump conf file
+	if grep -E -q '^[[:blank:]]+[a-z]' $KDUMP_CONFIG_FILE; then
+		echo "No whitespaces are allowed before a kdump option name in $KDUMP_CONFIG_FILE"
+		return 1
+	fi
+
    while read config_opt config_val; do
    	case "$config_opt" in
    	#* | "")