linux-kernel - [PATCH v1] tools/hv: reduce resouce usage in hv_get_dns

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Message-ID: <20241202120432.21115-1-olaf@aepfle.de>
Date: Mon,  2 Dec 2024 13:04:10 +0100
From: Olaf Hering <olaf@...fle.de>
To: linux-hyperv@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: "K. Y. Srinivasan" <kys@...rosoft.com>,
	Haiyang Zhang <haiyangz@...rosoft.com>,
	Wei Liu <wei.liu@...nel.org>,
	Dexuan Cui <decui@...rosoft.com>
Subject: [PATCH v1] tools/hv: reduce resouce usage in hv_get_dns_info helper

Remove the usage of cat. Replace the shell process with awk with 'exec'.
Also use a generic shell because no bash specific features will be used.

Signed-off-by: Olaf Hering <olaf@...fle.de>
---
 tools/hv/hv_get_dns_info.sh | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/hv/hv_get_dns_info.sh b/tools/hv/hv_get_dns_info.sh
index 058c17b46ffc..268521234d4b 100755
--- a/tools/hv/hv_get_dns_info.sh
+++ b/tools/hv/hv_get_dns_info.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 
 # This example script parses /etc/resolv.conf to retrive DNS information.
 # In the interest of keeping the KVP daemon code free of distro specific
@@ -10,4 +10,4 @@
 # this script can be based on the Network Manager APIs for retrieving DNS
 # entries.
 
-cat /etc/resolv.conf 2>/dev/null | awk '/^nameserver/ { print $2 }'
+exec awk '/^nameserver/ { print $2 }' /etc/resolv.conf 2>/dev/null