Re: regression: checkpatch.pl fails when called via symlink

[Joe Perches <joe@perches.com>]

On Wed, 2014-10-22 at 16:25 +0300, Jani Nikula wrote:
> On Wed, 22 Oct 2014, Joe Perches <joe@perches.com> wrote:
> > On Wed, 2014-10-22 at 13:43 +0300, Jani Nikula wrote:
> >> Since commit 66b47b4a9dad00e45c049d79966de9a3a1f4d337
> >> Author: Kees Cook <keescook@chromium.org>
> >> Date:   Mon Oct 13 15:51:57 2014 -0700
> >>     checkpatch: look for common misspellings
> >> checkpatch.pl dies with
> >> checkpatch.pl: Can't open /path/to/spelling.txt for reading: No such file or directory
> >> 
> >> if it's called through a symlink in /path/to/checkpatch.pl pointing at
> >> the actual script.
> >> 
> >> Please fail graciously, and just ignore spelling if you can't find
> >> spelling.txt. Or better yet, follow the links if you can.
> >
> > I agree it should fail better, but I'm also curious.
> > Why you want to use a symlink?
> 
> Simply because I think having $HOME/bin in $PATH and a symlink there is
> better than the alternatives.
[]
> Reference: http://xkcd.com/1172/

:)

Try this:

 scripts/checkpatch.pl | 38 +++++++++++++++++++++-----------------
 1 file changed, 21 insertions(+), 17 deletions(-)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index d94f5d8..a6354ec 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -7,10 +7,11 @@
 
 use strict;
 use POSIX;
+use File::Basename;
+use Cwd 'abs_path';
 
 my $P = $0;
-$P =~ s@(.*)/@@g;
-my $D = $1;
+my $D = dirname(abs_path($P));
 
 my $V = '0.32';
 
@@ -438,26 +439,29 @@ our $allowed_asm_includes = qr{(?x:
 
 # Load common spelling mistakes and build regular expression list.
 my $misspellings;
-my @spelling_list;
 my %spelling_fix;
-open(my $spelling, '<', $spelling_file)
-    or die "$P: Can't open $spelling_file for reading: $!\n";
-while (<$spelling>) {
-	my $line = $_;
 
-	$line =~ s/\s*\n?$//g;
-	$line =~ s/^\s*//g;
+if (open(my $spelling, '<', $spelling_file)) {
+	my @spelling_list;
+	while (<$spelling>) {
+		my $line = $_;
 
-	next if ($line =~ m/^\s*#/);
-	next if ($line =~ m/^\s*$/);
+		$line =~ s/\s*\n?$//g;
+		$line =~ s/^\s*//g;
 
-	my ($suspect, $fix) = split(/\|\|/, $line);
+		next if ($line =~ m/^\s*#/);
+		next if ($line =~ m/^\s*$/);
+
+		my ($suspect, $fix) = split(/\|\|/, $line);
 
-	push(@spelling_list, $suspect);
-	$spelling_fix{$suspect} = $fix;
+		push(@spelling_list, $suspect);
+		$spelling_fix{$suspect} = $fix;
+	}
+	close($spelling);
+	$misspellings = join("|", @spelling_list);
+} else {
+	warn "No typos will be found - file '$spelling_file': $!\n";
 }
-close($spelling);
-$misspellings = join("|", @spelling_list);
 
 sub build_types {
 	my $mods = "(?x:  \n" . join("|\n  ", @modifierList) . "\n)";
@@ -2246,7 +2250,7 @@ sub process {
 		}
 
 # Check for various typo / spelling mistakes
-		if ($in_commit_log || $line =~ /^\+/) {
+		if (defined($misspellings) && ($in_commit_log || $line =~ /^\+/)) {
 			while ($rawline =~ /(?:^|[^a-z@])($misspellings)(?:$|[^a-z@])/gi) {
 				my $typo = $1;
 				my $typo_fix = $spelling_fix{lc($typo)};