[PATCH] checkpatch: Use python3 by default with spdxcheck.py

[Ismael Luceno]

Allow to override this via the PYTHON environment variable.

Some systems still provide Python 2.x under the python name for
compatibility reasons; plus the spdxcheck.py script already specifies
python3 as it's interpreter.

Signed-off-by: Ismael Luceno <ism...@iodev.co.uk>
---
 scripts/checkpatch.pl | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index df8b23dc1eb0..3f7516e262b3 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -68,6 +68,7 @@ my $allow_c99_comments = 1; # Can be overridden by --ignore 
C99_COMMENT_TOLERANC
 my $git_command ='export LANGUAGE=en_US.UTF-8; git';
 my $tabsize = 8;
 my ${CONFIG_} = "CONFIG_";
+my $python = $ENV{'PYTHON'} || 'python3';
 
 sub help {
        my ($exitcode) = @_;
@@ -1000,10 +1001,10 @@ sub is_maintained_obsolete {
 sub is_SPDX_License_valid {
        my ($license) = @_;
 
-       return 1 if (!$tree || which("python") eq "" || !(-e 
"$root/scripts/spdxcheck.py") || !(-e "$gitroot"));
+       return 1 if (!$tree || which($python) eq "" || !(-e 
"$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 "$license" | "$python" 
scripts/spdxcheck.py -`;
        return 0 if ($status ne "");
        return 1;
 }
-- 
2.31.0