linux-kernel - [PATCH 20/22] ver_linux: use 'udevadm', instead of 'udevinfo'

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Message-Id: <1444675202-1375-20-git-send-email-alexander.kapshuk@gmail.com>
Date:	Mon, 12 Oct 2015 21:40:00 +0300
From:	Alexander Kapshuk <alexander.kapshuk@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	gregkh@...uxfoundation.org, jim.epost@...il.com, richard@....at,
	tytso@....edu, Alexander Kapshuk <alexander.kapshuk@...il.com>
Subject: [PATCH 20/22] ver_linux: use 'udevadm', instead of 'udevinfo'

'udevinfo' no longer seems to be available across various
distros. 'udevadm' seems to be the currently valid way to look up the
'udev' version.

Tested on:
Gentoo Linux
Debian 6.0.10
Oracle Linux Server release 7.1

Rely on regex to find the version number, rather than rely on numerical input to be found in a particular input field.
Proposed implementation also eliminates the necessity to invoke 'grep' + 'awk'.

Signed-off-by: Alexander Kapshuk <alexander.kapshuk@...il.com>
---
 scripts/ver_linux | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/scripts/ver_linux b/scripts/ver_linux
index 1c6ec22..f839be3 100755
--- a/scripts/ver_linux
+++ b/scripts/ver_linux
@@ -164,7 +164,12 @@ awk '/^expr/{
 	substr($0,RSTART,RLENGTH))
 }'
 
-udevinfo -V 2>&1 | grep version | awk '{print "udev                  ", $3}'
+udevadm --version 2>&1 |
+awk '/[0-9]+([.]?[0-9]+)+/ && !/not found$/{
+	match($0, /[0-9]+([.]?[0-9]+)+/)
+	printf("Udev\t\t\t%s\n",
+	substr($0,RSTART,RLENGTH))
+}'
 
 iwconfig --version 2>&1 | awk \
 '(NR==1 && ($3 == "version")) {print "wireless-tools        ",$4}'
-- 
2.4.9

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