[PATCH 4/5] scripts: sphinx-pre-install: fix a bug when using with venv

[Mauro Carvalho Chehab <mchehab+huawei@kernel.org>]

When python3 creates a venv, it adds python into it!

This causes any upgrade recommendation to look like this:

	/devel/v4l/docs/sphinx_1.7.9/bin/python3 -m venv sphinx_2.4.4
	. sphinx_2.4.4/bin/activate
	pip install -r ./Documentation/sphinx/requirements.txt

With is wrong (and it may not work). So, when recomending
an upgrade, exclude the venv dir from the search path, and
get the system's python.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
---
 scripts/sphinx-pre-install | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/scripts/sphinx-pre-install b/scripts/sphinx-pre-install
index 938b65d40fc8..987aebf7e3a0 100755
--- a/scripts/sphinx-pre-install
+++ b/scripts/sphinx-pre-install
@@ -148,6 +148,24 @@ sub findprog($)
 	}
 }
 
+sub find_python_no_venv()
+{
+	my $prog = shift;
+
+	my $cur_dir = qx(pwd);
+	$cur_dir =~ s/\s+$//;
+
+	foreach my $dir (split(/:/, $ENV{PATH})) {
+		next if ($dir =~ m,($cur_dir)/sphinx,);
+		return "$dir/python3" if(-x "$dir/python3");
+	}
+	foreach my $dir (split(/:/, $ENV{PATH})) {
+		next if ($dir =~ m,($cur_dir)/sphinx,);
+		return "$dir/python" if(-x "$dir/python");
+	}
+	return "python";
+}
+
 sub check_program($$)
 {
 	my $prog = shift;
@@ -814,6 +832,8 @@ sub check_needs()
 
 			print "To upgrade Sphinx, use:\n\n" if ($rec_sphinx_upgrade);
 
+			$python_cmd = find_python_no_venv();
+
 			if ($need_venv) {
 				printf "\t$python_cmd -m venv $virtenv_dir\n";
 			} else {
-- 
2.25.2