[PATCH] checkpatch: enforce process for expected files

[Michael S. Tsirkin]

If the process documented in tests/qtest/bios-tables-test.c
is followed, then same patch never touches both expected
files and code. Teach checkpatch to enforce this rule.

Signed-off-by: Michael S. Tsirkin <m...@redhat.com>
---

Peter, Igor what do you think?

 scripts/checkpatch.pl | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index b27e4ff5e9..96583e3fff 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -35,6 +35,8 @@ my $summary_file = 0;
 my $root;
 my %debug;
 my $help = 0;
+my $testexpected;
+my $nontestexpected;
 
 sub help {
        my ($exitcode) = @_;
@@ -1256,6 +1258,26 @@ sub WARN {
        }
 }
 
+# According to tests/qtest/bios-tables-test.c: do not
+# change expected file in the same commit with adding test
+sub checkfilename {
+       my ($name) = @_;
+        if ($name =~ m#^tests/data/acpi/# and
+            # make exception for a shell script that rebuilds the files
+            not $name =~ m#^\.sh$# or
+            $name =~ m#^tests/qtest/bios-tables-test-allowed-diff.h$#) {
+            $testexpected = $name;
+        } else {
+            $nontestexpected = $name;
+        }
+        if (defined $testexpected and defined $nontestexpected) {
+            ERROR("Do not add expected files together with tests, " .
+                  "follow instructions in " .
+                  "tests/qtest/bios-tables-test.c: both " .
+                  $testexpected . " and " . $nontestexpected . " found\n");
+        }
+}
+
 sub process {
        my $filename = shift;
 
@@ -1431,9 +1453,11 @@ sub process {
                if ($line =~ /^diff --git.*?(\S+)$/) {
                        $realfile = $1;
                        $realfile =~ s@^([^/]*)/@@ if (!$file);
+                        checkfilename($realfile);
                } elsif ($line =~ /^\+\+\+\s+(\S+)/) {
                        $realfile = $1;
                        $realfile =~ s@^([^/]*)/@@ if (!$file);
+                        checkfilename($realfile);
 
                        $p1_prefix = $1;
                        if (!$file && $tree && $p1_prefix ne '' &&
-- 
MST