[PATCH] checkpatch: Validate SPDX license with spdxcheck.py

[Joe Perches]

Use the existing scripts/spdxcheck.py to validate any
SPDX-License-Identifier found in line 1 or 2 of patches or files.

Miscellanea:

o Properly indent the existing SPDX-License-Identifier block.

Signed-off-by: Joe Perches <j...@perches.com>
---
 scripts/checkpatch.pl | 20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 34e4683de7a3..4523dd6d0476 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -849,6 +849,16 @@ sub is_maintained_obsolete {
        return $status =~ /obsolete/i;
 }
 
+sub is_SPDX_License_valid {
+       my ($license) = @_;
+
+       return 1 if (!$tree || which("python") eq "" || !(-e 
"$root/scripts/spdxcheck.py"));
+
+       my $status = `echo "$license" | python $root/scripts/spdxcheck.py -`;
+       return 0 if ($status ne "");
+       return 1;
+}
+
 my $camelcase_seeded = 0;
 sub seed_camelcase_includes {
        return if ($camelcase_seeded);
@@ -2978,8 +2988,14 @@ sub process {
 
                                if ($comment !~ /^$/ &&
                                    $rawline !~ /^\+\Q$comment\E 
SPDX-License-Identifier: /) {
-                                       WARN("SPDX_LICENSE_TAG",
-                                            "Missing or malformed 
SPDX-License-Identifier tag in line $checklicenseline\n" . $herecurr);
+                                        WARN("SPDX_LICENSE_TAG",
+                                             "Missing or malformed 
SPDX-License-Identifier tag in line $checklicenseline\n" . $herecurr);
+                               } elsif ($rawline =~ /(SPDX-License-Identifier: 
.*)/) {
+                                        my $spdx_license = $1;
+                                        if 
(!is_SPDX_License_valid($spdx_license)) {
+                                                 WARN("SPDX_LICENSE_TAG",
+                                                      "'$spdx_license' is not 
supported in LICENSES/...\n" . $herecurr);
+                                        }
                                }
                        }
                }