linux-kernel - [PATCH 13/22] ver_linux: libc, input redirection to sed fails in some distros

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Message-Id: <1444675202-1375-13-git-send-email-alexander.kapshuk@gmail.com>
Date:	Mon, 12 Oct 2015 21:39:53 +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 13/22] ver_linux: libc, input redirection to sed fails in some distros

The current implementation has been found not to work across all distros.

The proposed implementation relies on 'sed' to both output the string
'Linux C Library' as well as to open '/proc/self/maps' without having
to use output redirection.

Tested on:
Gentoo Linux
Debian 6.0.10
Oracle Linux Server release 7.1
Arch Linux
openSuSE 13.2

Signed-off-by: Alexander Kapshuk <alexander.kapshuk@...il.com>
---
 scripts/ver_linux | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/scripts/ver_linux b/scripts/ver_linux
index af5ac82..909d039 100755
--- a/scripts/ver_linux
+++ b/scripts/ver_linux
@@ -107,8 +107,12 @@ isdnctrl 2>&1 | grep version | awk \
 showmount --version 2>&1 | grep nfs-utils | awk \
 'NR==1{print "nfs-utils             ", $NF}'
 
-echo -n "Linux C Library        "
-sed -n -e '/^.*\/libc-\([^/]*\)\.so$/{s//\1/;p;q}' < /proc/self/maps
+test -r /proc/self/maps &&
+sed '
+	/.*libc-\(.*\)\.so$/!d
+	s//Linux C Library\t\t\1/
+	q
+' /proc/self/maps
 
 ldd -v > /dev/null 2>&1 && ldd -v || ldd --version |head -n 1 | awk \
 'NR==1{print "Dynamic linker (ldd)  ", $NF}'
-- 
2.4.9

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