docs: drop the version constraints for sphinx and dependencies

As discussed (see Links), there is some inertia to move to the recent
Sphinx versions for the doc build environment.

As first step, drop the version constraints and the related comments. As
sphinx depends on jinja2, jinja2 is pulled in automatically. So drop that.
Then, the sphinx-pre-install script will fail though with:

  Can't get default sphinx version from ./Documentation/sphinx/requirements.txt at ./scripts/sphinx-pre-install line 305.

The script simply expects to parse a version constraint with Sphinx in the
requirements.txt. That version is used in the script for suggesting the
virtualenv directory name.

To suggest a virtualenv directory name, when there is no version given in
the requirements.txt, one could try to guess the version that would be
downloaded with 'pip install -r Documentation/sphinx/requirements.txt'.
However, there seems no simple way to get that version without actually
setting up the venv and running pip. So, instead, name the directory with
the fixed name 'sphinx_latest'.

Finally update the Sphinx build documentation to reflect this directory
name change.

Link: https://lore.kernel.org/linux-doc/874jf4m384.fsf@meer.lwn.net/
Link: https://lore.kernel.org/linux-doc/20240226093854.47830-1-lukas.bulwahn@gmail.com/
Reviewed-by: Akira Yokosawa <akiyks@gmail.com>
Tested-by: Vegard Nossum <vegard.nossum@oracle.com>
Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Message-ID: <20240301141800.30218-1-lukas.bulwahn@gmail.com>

1 files changed, 3 insertions, 16 deletions

diff --git a/scripts/sphinx-pre-install b/scripts/sphinx-pre-install
index de0de5dd676e..4c781617ffe6 100755
--- a/scripts/sphinx-pre-install
+++ b/scripts/sphinx-pre-install
@@ -280,8 +280,6 @@ sub get_sphinx_version($)
 
 sub check_sphinx()
 {
-	my $default_version;
-
 	open IN, $conf or die "Can't open $conf";
 	while (<IN>) {
 		if (m/^\s*needs_sphinx\s*=\s*[\'\"]([\d\.]+)[\'\"]/) {
@@ -293,18 +291,7 @@ sub check_sphinx()
 
 	die "Can't get needs_sphinx version from $conf" if (!$min_version);
 
-	open IN, $requirement_file or die "Can't open $requirement_file";
-	while (<IN>) {
-		if (m/^\s*Sphinx\s*==\s*([\d\.]+)$/) {
-			$default_version=$1;
-			last;
-		}
-	}
-	close IN;
-
-	die "Can't get default sphinx version from $requirement_file" if (!$default_version);
-
-	$virtenv_dir = $virtenv_prefix . $default_version;
+	$virtenv_dir = $virtenv_prefix . "latest";
 
 	my $sphinx = get_sphinx_fname();
 	if ($sphinx eq "") {
@@ -318,8 +305,8 @@ sub check_sphinx()
 	die "$sphinx didn't return its version" if (!$cur_version);
 
 	if ($cur_version lt $min_version) {
-		printf "ERROR: Sphinx version is %s. It should be >= %s (recommended >= %s)\n",
-		       $cur_version, $min_version, $default_version;
+		printf "ERROR: Sphinx version is %s. It should be >= %s\n",
+		       $cur_version, $min_version;
 		$need_sphinx = 1;
 		return;
 	}