checkpatch: fix SPDX license check with --root=<path>

checkpatch uses the in-kernel script spdxcheck.py to validate the specific
license in a file or script.

This check can currently fail for a couple reasons:

o spdxcheck.py assumes the existence of git tree that may not
  exist for a bare source tree from something like a tarball
o the spdxcheck.py must be run from the top level root directory

So add a git existence test and set the subprocess subdirectory.

Link: http://lkml.kernel.org/r/2b32864324ae9c92948b002ec4c0c22409ed98f1.camel@perches.com
Signed-off-by: Joe Perches <joe@perches.com>
Reported-by: Charlemagne Lasse <charlemagnelasse@gmail.com>
Tested-by: Charlemagne Lasse <charlemagnelasse@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 3 insertions, 2 deletions

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 25adf9811a2c..eced9b303995 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -852,9 +852,10 @@ sub is_maintained_obsolete {
 sub is_SPDX_License_valid {
         my ($license) = @_;
 
-        return 1 if (!$tree || which("python") eq "" || !(-e "$root/scripts/spdxcheck.py"));
+        return 1 if (!$tree || which("python") eq "" || !(-e "$root/scripts/spdxcheck.py") || !(-e "$root/.git"));
 
-        my $status = `echo "$license" | python $root/scripts/spdxcheck.py -`;
+        my $root_path = abs_path($root);
+        my $status = `cd "$root_path"; echo "$license" | python scripts/spdxcheck.py -`;
         return 0 if ($status ne "");
         return 1;
 }