[PATCH] docs: scripts: sphinx-pre-install: Fix building docs with pyyaml package

[Thorsten Blum]

The Python module pyyaml is required to build the docs, but it is only
listed in Documentation/sphinx/requirements.txt and is therefore missing
when Sphinx is installed as a package and not via pip/pypi.

Add pyyaml as an optional package for Debian- and Red Hat-based distros to
fix building the docs if you prefer to install Sphinx as a package.

Signed-off-by: Thorsten Blum <thorsten.blum@xxxxxxxxxx>
---
 scripts/sphinx-pre-install | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/scripts/sphinx-pre-install b/scripts/sphinx-pre-install
index 25aefbb35377..7905beab3359 100755
--- a/scripts/sphinx-pre-install
+++ b/scripts/sphinx-pre-install
@@ -361,6 +361,7 @@ sub give_debian_hints()
 {
 	my %map = (
 		"python-sphinx"		=> "python3-sphinx",
+		"pyyaml"		=> "python3-yaml",
 		"ensurepip"		=> "python3-venv",
 		"virtualenv"		=> "virtualenv",
 		"dot"			=> "graphviz",
@@ -395,6 +396,7 @@ sub give_redhat_hints()
 {
 	my %map = (
 		"python-sphinx"		=> "python3-sphinx",
+		"pyyaml"		=> "python3-pyyaml",
 		"virtualenv"		=> "python3-virtualenv",
 		"dot"			=> "graphviz",
 		"convert"		=> "ImageMagick",
@@ -955,6 +957,7 @@ sub check_needs()
 	check_program("gcc", 0);
 	check_program("dot", 1);
 	check_program("convert", 1);
+	check_python_module("pyyaml", 1);
 
 	# Extra PDF files - should use 2 for is_optional
 	check_program("xelatex", 2) if ($pdf);
-- 
2.39.2