checkpatch: fix for flag --no-tree

When checkpatch is run with command line flag --no-tree, it cannot
find local 'companion' files and has to skip loading them.

This has caused issues with change https://review.openocd.org/7211
on jenkins.

Skip loading 'tools/scripts/camelcase.txt' with flag --no-tree.
While there, rewrite the associated error message.

Change-Id: I6ede7b16f9ccd77b9118fd9be7ada07a1ac96952
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-on: https://review.openocd.org/c/openocd/+/7212
Tested-by: jenkins

diff --git a/tools/scripts/checkpatch.pl b/tools/scripts/checkpatch.pl
index 10b0b8c257697a36d562e78cc2225b49db7c2f2e..9dda61cde010bbfa2512730eae67ba4214839f00 100755 (executable)
--- a/tools/scripts/checkpatch.pl
+++ b/tools/scripts/checkpatch.pl
@@ -995,8 +995,10 @@ sub read_words {
 
 # OpenOCD specific: Begin: Load list of allowed CamelCase symbols
 if (show_type("CAMELCASE")) {
-       my $allowed_camelcase_file = "$root/tools/scripts/camelcase.txt";
-       if (open(my $words, '<', $allowed_camelcase_file)) {
+       my $allowed_camelcase_file = "tools/scripts/camelcase.txt";
+       if (!$root) {
+               warn "Ignore list of allowed camelcase symbols.\n";
+       } elsif (open(my $words, '<', "$root/$allowed_camelcase_file")) {
                while (<$words>) {
                         my $line = $_;
 
@@ -1012,9 +1014,9 @@ if (show_type("CAMELCASE")) {
 
                        $camelcase{$line} = 1;
                }
-               close($allowed_camelcase_file);
+               close("$root/$allowed_camelcase_file");
        } else {
-               warn "No camelcase symbols to ignore - file '$allowed_camelcase_file': $!\n";
+               warn "Failed opening file '$root/$allowed_camelcase_file': $!\n";
        }
 }
 # OpenOCD specific: End