linux-kernel - [PATCH 1/3] do collectcfiles work in perl itself, eschew shell pipeline

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Message-Id: <1306176297-6964-2-git-send-email-jim.cromie@gmail.com>
Date:	Mon, 23 May 2011 12:44:55 -0600
From:	Jim Cromie <jim.cromie@...il.com>
To:	rdunlap@...otime.net
Cc:	linux-kernel@...r.kernel.org, linux-kbuild@...r.kernel.org,
	Jim Cromie <jim.cromie@...il.com>
Subject: [PATCH 1/3] do collectcfiles work in perl itself, eschew shell pipeline

Avoid spawning a shell pipeline doing cat, grep, sed, and do it all
inside perl.  The <*.c> globbing construct works at least as far back
as 5.8.9

Note that this is not just an optimization; the sed command
in the pipeline was unterminated, due to lack of escape on the
end-of-line (\$) in the regex, resulting in this:

    $ perl ../linux-2.6/scripts/export_report.pl  > /dev/null
    sed: -e expression #1, char 5: unterminated `s' command
    sh: .mod.c/: not found

Comments on an earlier patch sought an all-perl implementation.

Signed-off-by: Jim Cromie <jim.cromie@...il.com>
cc: Michal Marek <mmarek@...e.cz>,
cc: linux-kbuild@...r.kernel.org
cc: Arnaud Lacombe lacombar@...il.com
cc: Stephen Hemminger shemminger@...tta.com
---
 scripts/export_report.pl |   10 ++++++++--
 1 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/scripts/export_report.pl b/scripts/export_report.pl
index 04dce7c..f97899c 100644
--- a/scripts/export_report.pl
+++ b/scripts/export_report.pl
@@ -49,8 +49,14 @@ sub usage {
 }
 
 sub collectcfiles {
-    my @file
-	= `cat .tmp_versions/*.mod | grep '.*\.ko\$' | sed s/\.ko$/.mod.c/`;
+    my @file;
+    while (<.tmp_versions/*.mod>) {
+	open my $fh, '<', $_ or die "cannot open $_: $!\n";
+	push (@file,
+	      grep s/\.ko/.mod.c/,	# change the suffix
+	      grep m/.+\.ko/,		# find the .ko path
+	      <$fh>);			# lines in opened file
+    }
     chomp @file;
     return @file;
 }
-- 
1.7.4.4

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