scripts: sphinx-pre-install: add support for python -m venv
Since python 3.3, the recommended way to setup a virtual env is
via "python -m venv".
Set this as a default, if python version is compatible with
such feature.
While here, add more comments to it, as the script is
getting more complex. So, better to add more things, to avoid
accidentally breaking it while improving it.
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/252cc849c79527ad496247e4c481961478adf41c.1586883286.git.mchehab+huawei@kernel.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
diff --git a/scripts/sphinx-pre-install b/scripts/sphinx-pre-install
index 89b0332..d4dfe1e 100755
--- a/scripts/sphinx-pre-install
+++ b/scripts/sphinx-pre-install
@@ -2,7 +2,7 @@
# SPDX-License-Identifier: GPL-2.0-or-later
use strict;
-# Copyright (c) 2017-2019 Mauro Carvalho Chehab <mchehab@kernel.org>
+# Copyright (c) 2017-2020 Mauro Carvalho Chehab <mchehab@kernel.org>
#
my $prefix = "./";
@@ -22,9 +22,12 @@
my $optional = 0;
my $need_symlink = 0;
my $need_sphinx = 0;
+my $need_venv = 0;
+my $need_virtualenv = 0;
my $rec_sphinx_upgrade = 0;
my $install = "";
my $virtenv_dir = "";
+my $python_cmd = "";
my $min_version;
#
@@ -147,7 +150,7 @@
my $prog = shift;
my $is_optional = shift;
- return if findprog($prog);
+ return $prog if findprog($prog);
add_package($prog, $is_optional);
}
@@ -168,9 +171,9 @@
my $prog = shift;
my $is_optional = shift;
- my $err = system("python3 -c 'import $prog' 2>/dev/null /dev/null");
- return if ($err == 0);
- my $err = system("python -c 'import $prog' 2>/dev/null /dev/null");
+ return if (!$python_cmd);
+
+ my $err = system("$python_cmd -c 'import $prog' 2>/dev/null /dev/null");
return if ($err == 0);
add_package($prog, $is_optional);
@@ -225,16 +228,6 @@
return $fname;
}
- if ($virtualenv) {
- my $prog = findprog("virtualenv-3");
- $prog = findprog("virtualenv-3.5") if (!$prog);
-
- check_program("virtualenv", 0) if (!$prog);
- $need_sphinx = 1;
- } else {
- add_package("python-sphinx", 0);
- }
-
return "";
}
@@ -268,7 +261,10 @@
$virtenv_dir = $virtenv_prefix . $rec_version;
my $sphinx = get_sphinx_fname();
- return if ($sphinx eq "");
+ if ($sphinx eq "") {
+ $need_sphinx = 1;
+ return;
+ }
open IN, "$sphinx --version 2>&1 |" or die "$sphinx returned an error";
while (<IN>) {
@@ -336,6 +332,7 @@
my %map = (
"python-sphinx" => "python3-sphinx",
"sphinx_rtd_theme" => "python3-sphinx-rtd-theme",
+ "ensurepip" => "python3-venv",
"virtualenv" => "virtualenv",
"dot" => "graphviz",
"convert" => "imagemagick",
@@ -672,13 +669,13 @@
sub deactivate_help()
{
- printf "\tIf you want to exit the virtualenv, you can use:\n";
+ printf "\nIf you want to exit the virtualenv, you can use:\n";
printf "\tdeactivate\n";
}
sub check_needs()
{
- # Check for needed programs/tools
+ # Check if Sphinx is already accessible from current environment
check_sphinx();
if ($system_release) {
@@ -689,6 +686,43 @@
print "To upgrade Sphinx, use:\n\n" if ($rec_sphinx_upgrade);
+ # Check python command line, trying first python3
+ $python_cmd = findprog("python3");
+ $python_cmd = check_program("python", 0) if (!$python_cmd);
+
+ # Check the type of virtual env, depending on Python version
+ if ($python_cmd) {
+ if ($virtualenv) {
+ my $tmp = qx($python_cmd --version 2>&1);
+ if ($tmp =~ m/(\d+\.)(\d+\.)/) {
+ if ($1 >= 3 && $2 >= 3) {
+ $need_venv = 1; # python 3.3 or upper
+ } else {
+ $need_virtualenv = 1;
+ }
+ if ($1 < 3) {
+ # Complain if it finds python2 (or worse)
+ printf "Warning: python$1 support is deprecated. Use it with caution!\n";
+ }
+ } else {
+ die "Warning: couldn't identify $python_cmd version!";
+ }
+ } else {
+ add_package("python-sphinx", 0);
+ }
+ }
+
+ # Set virtualenv command line, if python < 3.3
+ my $virtualenv_cmd;
+ if ($need_virtualenv) {
+ $virtualenv_cmd = findprog("virtualenv-3");
+ $virtualenv_cmd = findprog("virtualenv-3.5") if (!$virtualenv_cmd);
+ if (!$virtualenv_cmd) {
+ check_program("virtualenv", 0);
+ $virtualenv_cmd = "virtualenv";
+ }
+ }
+
# Check for needed programs/tools
check_perl_module("Pod::Usage", 0);
check_program("make", 0);
@@ -702,12 +736,30 @@
check_program("rsvg-convert", 2) if ($pdf);
check_program("latexmk", 2) if ($pdf);
+ if ($need_sphinx || $rec_sphinx_upgrade) {
+ check_python_module("ensurepip", 0) if ($need_venv);
+ }
+
+ # Do distro-specific checks and output distro-install commands
check_distros();
+ if (!$python_cmd) {
+ if ($need == 1) {
+ die "Can't build as $need mandatory dependency is missing";
+ } elsif ($need) {
+ die "Can't build as $need mandatory dependencies are missing";
+ }
+ }
+
+ # Check if sphinx-build is called sphinx-build-3
if ($need_symlink) {
printf "\tsudo ln -sf %s /usr/bin/sphinx-build\n\n",
which("sphinx-build-3");
}
+
+ # NOTE: if the system has a too old Sphinx version installed,
+ # it will recommend installing a newer version using virtualenv
+
if ($need_sphinx || $rec_sphinx_upgrade) {
my $min_activate = "$ENV{'PWD'}/${virtenv_prefix}${min_version}/bin/activate";
my @activates = glob "$ENV{'PWD'}/${virtenv_prefix}*/bin/activate";
@@ -721,27 +773,12 @@
exit (1);
} else {
my $rec_activate = "$virtenv_dir/bin/activate";
- my $virtualenv = findprog("virtualenv-3");
- my $rec_python3 = "";
- $virtualenv = findprog("virtualenv-3.5") if (!$virtualenv);
- $virtualenv = findprog("virtualenv") if (!$virtualenv);
- $virtualenv = "virtualenv" if (!$virtualenv);
- my $rel = "";
- if (index($system_release, "Ubuntu") != -1) {
- $rel = $1 if ($system_release =~ /Ubuntu\s+(\d+)[.]/);
- if ($rel && $rel >= 16) {
- $rec_python3 = " -p python3";
- }
+ if ($need_venv) {
+ printf "\t$python_cmd -m venv $virtenv_dir\n";
+ } else {
+ printf "\t$virtualenv_cmd $virtenv_dir\n";
}
- if (index($system_release, "Debian") != -1) {
- $rel = $1 if ($system_release =~ /Debian\s+(\d+)/);
- if ($rel && $rel >= 7) {
- $rec_python3 = " -p python3";
- }
- }
-
- printf "\t$virtualenv$rec_python3 $virtenv_dir\n";
printf "\t. $rec_activate\n";
printf "\tpip install -r $requirement_file\n";
deactivate_help();