checkpatch: add a --strict check for utf-8 in commit logs

Some find using utf-8 in commit logs inappropriate.

Some patch commit logs contain unintended utf-8 characters when doing
things like copy/pasting compilation output.

Look for the start of any commit log by skipping initial lines that look
like email headers and "From: " lines.

Stop looking for utf-8 at the first signature line.

Signed-off-by: Joe Perches <joe@perches.com>
Suggested-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Whitcroft <apw@shadowen.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 5ba679c..5e93342 100755 (executable)
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -240,9 +240,8 @@ our $NonptrType;
 our $Type;
 our $Declare;
 
-our $UTF8      = qr {
-       [\x09\x0A\x0D\x20-\x7E]              # ASCII
-       | [\xC2-\xDF][\x80-\xBF]             # non-overlong 2-byte
+our $NON_ASCII_UTF8    = qr{
+       [\xC2-\xDF][\x80-\xBF]               # non-overlong 2-byte
        |  \xE0[\xA0-\xBF][\x80-\xBF]        # excluding overlongs
        | [\xE1-\xEC\xEE\xEF][\x80-\xBF]{2}  # straight 3-byte
        |  \xED[\x80-\x9F][\x80-\xBF]        # excluding surrogates
@@ -251,6 +250,11 @@ our $UTF8  = qr {
        |  \xF4[\x80-\x8F][\x80-\xBF]{2}     # plane 16
 }x;
 
+our $UTF8      = qr{
+       [\x09\x0A\x0D\x20-\x7E]              # ASCII
+       | $NON_ASCII_UTF8
+}x;
+
 our $typeTypedefs = qr{(?x:
        (?:__)?(?:u|s|be|le)(?:8|16|32|64)|
        atomic_t
@@ -1330,6 +1334,9 @@ sub process {
        my $signoff = 0;
        my $is_patch = 0;
 
+       my $in_header_lines = 1;
+       my $in_commit_log = 0;          #Scanning lines before patch
+
        our @report = ();
        our $cnt_lines = 0;
        our $cnt_error = 0;
@@ -1497,7 +1504,6 @@ sub process {
                if ($line =~ /^diff --git.*?(\S+)$/) {
                        $realfile = $1;
                        $realfile =~ s@^([^/]*)/@@;
-
                } elsif ($line =~ /^\+\+\+\s+(\S+)/) {
                        $realfile = $1;
                        $realfile =~ s@^([^/]*)/@@;
@@ -1536,6 +1542,7 @@ sub process {
 # Check the patch for a signoff:
                if ($line =~ /^\s*signed-off-by:/i) {
                        $signoff++;
+                       $in_commit_log = 0;
                }
 
 # Check signature styles
@@ -1613,6 +1620,21 @@ sub process {
                            "Invalid UTF-8, patch and commit message should be encoded in UTF-8\n" . $hereptr);
                }
 
+# Check if it's the start of a commit log
+# (not a header line and we haven't seen the patch filename)
+               if ($in_header_lines && $realfile =~ /^$/ &&
+                   $rawline !~ /^(commit\b|from\b|\w+:).+$/i) {
+                       $in_header_lines = 0;
+                       $in_commit_log = 1;
+               }
+
+# Still not yet in a patch, check for any UTF-8
+               if ($in_commit_log && $realfile =~ /^$/ &&
+                   $rawline =~ /$NON_ASCII_UTF8/) {
+                       CHK("UTF8_BEFORE_PATCH",
+                           "8-bit UTF-8 used in possible commit log\n" . $herecurr);
+               }
+
 # ignore non-hunk lines and lines being removed
                next if (!$hunk_line || $line =~ /^-/);