[PATCH] checkpatch: scripts/spdxcheck.py now requires python3

[Guenter Roeck]

Since commit d0259c42abff ("spdxcheck.py: Use Python 3"), spdxcheck.py
explicitly expects to run as python3 script. If "python" still points to
python v2.7 and the script is executed with "python scripts/spdxcheck.py",
the following error may be seen even if git-python is installed for
python3.

Traceback (most recent call last):
  File "scripts/spdxcheck.py", line 10, in <module>
    import git
ImportError: No module named git

To fix the problem, check for the existence of python3, check if
the script is executable and not just for its existence, and execute
it directly.

Cc: Bert Vermeulen <bert@xxxxxxxx>
Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx>
---
 scripts/checkpatch.pl | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index ccb412a74725..8a1b782dd7e7 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -1084,10 +1084,10 @@ sub is_maintained_obsolete {
 sub is_SPDX_License_valid {
 	my ($license) = @_;
 
-	return 1 if (!$tree || which("python") eq "" || !(-e "$root/scripts/spdxcheck.py") || !(-e "$gitroot"));
+	return 1 if (!$tree || which("python3") eq "" || !(-x "$root/scripts/spdxcheck.py") || !(-e "$gitroot"));
 
 	my $root_path = abs_path($root);
-	my $status = `cd "$root_path"; echo "$license" | python scripts/spdxcheck.py -`;
+	my $status = `cd "$root_path"; echo "$license" | scripts/spdxcheck.py -`;
 	return 0 if ($status ne "");
 	return 1;
 }
-- 
2.25.1