Copy kernel's checkpatch.pl and improve prep_commit_msg.pl

From: Mauro Carvalho Chehab <mchehab@infradead.org>

Kernel's checkpatch.pl appeared only on kernel version 2.6.22. However, several
improvements happened on recent kernels.

This patch copies the latest version (0.11) of checkpatch.pl to the v4l-dvb
development tree.

Also, now, prep_commit_msg.pl checks if the script is available at Kernel
and checks for its version. If the version is older than the in-tree one, it
uses the in-tree. Otherwise, kernel version is used.

It is always a good idea to use kernel's checkpatch.pl, since some additional
tests can be done when using the kernel's, like checking for the usage of
depreciated API's.

Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

1 files changed, 34 insertions, 2 deletions

diff --git a/v4l/scripts/prep_commit_msg.pl b/v4l/scripts/prep_commit_msg.pl
index 1316a7c44..ffd8aeb84 100755
--- a/v4l/scripts/prep_commit_msg.pl
+++ b/v4l/scripts/prep_commit_msg.pl
@@ -55,14 +55,46 @@ if (!$checkpatch) {
 	$checkpatch="/lib/modules/`uname -r`/build/scripts/checkpatch.pl";
 }
 
+my $cp_version;
+open IN,"$checkpatch|";
+while (<IN>) {
+	tr/A-Z/a-z/;
+	if (m/version\s*:\s*([\d\.]+)/) {
+		$cp_version = $1;
+	}
+}
+close IN;
+
+my $intree_checkpatch = "scripts/checkpatch.pl --no-tree";
+if (!open IN,"$intree_checkpatch|") {
+	$intree_checkpatch = "v4l/".$intree_checkpatch;
+	open IN,"$intree_checkpatch|";
+}
+while (<IN>) {
+	tr/A-Z/a-z/;
+	if (m/version\s*:\s*([\d\.]+)/) {
+		if ($1 > $cp_version) {
+			print "# WARNING: $checkpatch version $cp_version is\n"
+			      ."#         older than $intree_checkpatch version"
+			      ." $1.\n#          Using in-tree one.\n#\n";
+			$cp_version = $1;
+			$checkpatch = $intree_checkpatch;
+		}
+	}
+}
+close IN;
+
 print "# Added/removed/changed files:\n";
 system "hg $diff | diffstat -p1 -c";
 
-open IN,"hg $diff | $checkpatch -q --nosignoff --notree -|";
+open IN,"hg $diff | $checkpatch -q --nosignoff -|";
 my $err=0;
 while (<IN>) {
 	if (!$err) {
-		print "#\n# WARN: checkpatch.pl returned some errors. Please fix.\n";
+		print "#\n# WARNING: $checkpatch version $cp_version returned ".
+		      "some errors.\n#          Please fix.\n#\n";
+
+
 		$err=1;
 	}
 	print "# $_";