xref: /openbmc/linux/scripts/sphinx-pre-install (revision 6a143a7c) 
1#!/usr/bin/env perl
2# SPDX-License-Identifier: GPL-2.0-or-later
3use strict;
4
5# Copyright (c) 2017-2020 Mauro Carvalho Chehab <mchehab@kernel.org>
6#
7
8my $prefix = "./";
9$prefix = "$ENV{'srctree'}/" if ($ENV{'srctree'});
10
11my $conf = $prefix . "Documentation/conf.py";
12my $requirement_file = $prefix . "Documentation/sphinx/requirements.txt";
13my $virtenv_prefix = "sphinx_";
14
15#
16# Static vars
17#
18
19my %missing;
20my $system_release;
21my $need = 0;
22my $optional = 0;
23my $need_symlink = 0;
24my $need_sphinx = 0;
25my $need_venv = 0;
26my $need_virtualenv = 0;
27my $rec_sphinx_upgrade = 0;
28my $install = "";
29my $virtenv_dir = "";
30my $python_cmd = "";
31my $min_version;
32my $cur_version;
33my $rec_version = "1.7.9";	# PDF won't build here
34my $min_pdf_version = "2.4.4";	# Min version where pdf builds
35
36#
37# Command line arguments
38#
39
40my $pdf = 1;
41my $virtualenv = 1;
42my $version_check = 0;
43
44#
45# List of required texlive packages on Fedora and OpenSuse
46#
47
48my %texlive = (
49	'amsfonts.sty'       => 'texlive-amsfonts',
50	'amsmath.sty'        => 'texlive-amsmath',
51	'amssymb.sty'        => 'texlive-amsfonts',
52	'amsthm.sty'         => 'texlive-amscls',
53	'anyfontsize.sty'    => 'texlive-anyfontsize',
54	'atbegshi.sty'       => 'texlive-oberdiek',
55	'bm.sty'             => 'texlive-tools',
56	'capt-of.sty'        => 'texlive-capt-of',
57	'cmap.sty'           => 'texlive-cmap',
58	'ecrm1000.tfm'       => 'texlive-ec',
59	'eqparbox.sty'       => 'texlive-eqparbox',
60	'eu1enc.def'         => 'texlive-euenc',
61	'fancybox.sty'       => 'texlive-fancybox',
62	'fancyvrb.sty'       => 'texlive-fancyvrb',
63	'float.sty'          => 'texlive-float',
64	'fncychap.sty'       => 'texlive-fncychap',
65	'footnote.sty'       => 'texlive-mdwtools',
66	'framed.sty'         => 'texlive-framed',
67	'luatex85.sty'       => 'texlive-luatex85',
68	'multirow.sty'       => 'texlive-multirow',
69	'needspace.sty'      => 'texlive-needspace',
70	'palatino.sty'       => 'texlive-psnfss',
71	'parskip.sty'        => 'texlive-parskip',
72	'polyglossia.sty'    => 'texlive-polyglossia',
73	'tabulary.sty'       => 'texlive-tabulary',
74	'threeparttable.sty' => 'texlive-threeparttable',
75	'titlesec.sty'       => 'texlive-titlesec',
76	'ucs.sty'            => 'texlive-ucs',
77	'upquote.sty'        => 'texlive-upquote',
78	'wrapfig.sty'        => 'texlive-wrapfig',
79);
80
81#
82# Subroutines that checks if a feature exists
83#
84
85sub check_missing(%)
86{
87	my %map = %{$_[0]};
88
89	foreach my $prog (sort keys %missing) {
90		my $is_optional = $missing{$prog};
91
92		# At least on some LTS distros like CentOS 7, texlive doesn't
93		# provide all packages we need. When such distros are
94		# detected, we have to disable PDF output.
95		#
96		# So, we need to ignore the packages that distros would
97		# need for LaTeX to work
98		if ($is_optional == 2 && !$pdf) {
99			$optional--;
100			next;
101		}
102
103		if ($is_optional) {
104			print "Warning: better to also install \"$prog\".\n";
105		} else {
106			print "ERROR: please install \"$prog\", otherwise, build won't work.\n";
107		}
108		if (defined($map{$prog})) {
109			$install .= " " . $map{$prog};
110		} else {
111			$install .= " " . $prog;
112		}
113	}
114
115	$install =~ s/^\s//;
116}
117
118sub add_package($$)
119{
120	my $package = shift;
121	my $is_optional = shift;
122
123	$missing{$package} = $is_optional;
124	if ($is_optional) {
125		$optional++;
126	} else {
127		$need++;
128	}
129}
130
131sub check_missing_file($$$)
132{
133	my $files = shift;
134	my $package = shift;
135	my $is_optional = shift;
136
137	for (@$files) {
138		return if(-e $_);
139	}
140
141	add_package($package, $is_optional);
142}
143
144sub findprog($)
145{
146	foreach(split(/:/, $ENV{PATH})) {
147		return "$_/$_[0]" if(-x "$_/$_[0]");
148	}
149}
150
151sub find_python_no_venv()
152{
153	my $prog = shift;
154
155	my $cur_dir = qx(pwd);
156	$cur_dir =~ s/\s+$//;
157
158	foreach my $dir (split(/:/, $ENV{PATH})) {
159		next if ($dir =~ m,($cur_dir)/sphinx,);
160		return "$dir/python3" if(-x "$dir/python3");
161	}
162	foreach my $dir (split(/:/, $ENV{PATH})) {
163		next if ($dir =~ m,($cur_dir)/sphinx,);
164		return "$dir/python" if(-x "$dir/python");
165	}
166	return "python";
167}
168
169sub check_program($$)
170{
171	my $prog = shift;
172	my $is_optional = shift;
173
174	return $prog if findprog($prog);
175
176	add_package($prog, $is_optional);
177}
178
179sub check_perl_module($$)
180{
181	my $prog = shift;
182	my $is_optional = shift;
183
184	my $err = system("perl -M$prog -e 1 2>/dev/null /dev/null");
185	return if ($err == 0);
186
187	add_package($prog, $is_optional);
188}
189
190sub check_python_module($$)
191{
192	my $prog = shift;
193	my $is_optional = shift;
194
195	return if (!$python_cmd);
196
197	my $err = system("$python_cmd -c 'import $prog' 2>/dev/null /dev/null");
198	return if ($err == 0);
199
200	add_package($prog, $is_optional);
201}
202
203sub check_rpm_missing($$)
204{
205	my @pkgs = @{$_[0]};
206	my $is_optional = $_[1];
207
208	foreach my $prog(@pkgs) {
209		my $err = system("rpm -q '$prog' 2>/dev/null >/dev/null");
210		add_package($prog, $is_optional) if ($err);
211	}
212}
213
214sub check_pacman_missing($$)
215{
216	my @pkgs = @{$_[0]};
217	my $is_optional = $_[1];
218
219	foreach my $prog(@pkgs) {
220		my $err = system("pacman -Q '$prog' 2>/dev/null >/dev/null");
221		add_package($prog, $is_optional) if ($err);
222	}
223}
224
225sub check_missing_tex($)
226{
227	my $is_optional = shift;
228	my $kpsewhich = findprog("kpsewhich");
229
230	foreach my $prog(keys %texlive) {
231		my $package = $texlive{$prog};
232		if (!$kpsewhich) {
233			add_package($package, $is_optional);
234			next;
235		}
236		my $file = qx($kpsewhich $prog);
237		add_package($package, $is_optional) if ($file =~ /^\s*$/);
238	}
239}
240
241sub get_sphinx_fname()
242{
243	my $fname = "sphinx-build";
244	return $fname if findprog($fname);
245
246	$fname = "sphinx-build-3";
247	if (findprog($fname)) {
248		$need_symlink = 1;
249		return $fname;
250	}
251
252	return "";
253}
254
255sub get_sphinx_version($)
256{
257	my $cmd = shift;
258	my $ver;
259
260	open IN, "$cmd --version 2>&1 |";
261	while (<IN>) {
262		if (m/^\s*sphinx-build\s+([\d\.]+)(\+\/[\da-f]+)?$/) {
263			$ver=$1;
264			last;
265		}
266		# Sphinx 1.2.x uses a different format
267		if (m/^\s*Sphinx.*\s+([\d\.]+)$/) {
268			$ver=$1;
269			last;
270		}
271	}
272	close IN;
273	return $ver;
274}
275
276sub check_sphinx()
277{
278	my $default_version;
279
280	open IN, $conf or die "Can't open $conf";
281	while (<IN>) {
282		if (m/^\s*needs_sphinx\s*=\s*[\'\"]([\d\.]+)[\'\"]/) {
283			$min_version=$1;
284			last;
285		}
286	}
287	close IN;
288
289	die "Can't get needs_sphinx version from $conf" if (!$min_version);
290
291	open IN, $requirement_file or die "Can't open $requirement_file";
292	while (<IN>) {
293		if (m/^\s*Sphinx\s*==\s*([\d\.]+)$/) {
294			$default_version=$1;
295			last;
296		}
297	}
298	close IN;
299
300	die "Can't get default sphinx version from $requirement_file" if (!$default_version);
301
302	$virtenv_dir = $virtenv_prefix . $default_version;
303
304	my $sphinx = get_sphinx_fname();
305	if ($sphinx eq "") {
306		$need_sphinx = 1;
307		return;
308	}
309
310	$cur_version = get_sphinx_version($sphinx);
311	die ("$sphinx returned an error") if (!$cur_version);
312
313	die "$sphinx didn't return its version" if (!$cur_version);
314
315	if ($cur_version lt $min_version) {
316		printf "ERROR: Sphinx version is %s. It should be >= %s (recommended >= %s)\n",
317		       $cur_version, $min_version, $default_version;
318		$need_sphinx = 1;
319		return;
320	}
321
322	if ($cur_version lt $rec_version) {
323		$rec_sphinx_upgrade = 1;
324		return;
325	}
326
327	# On version check mode, just assume Sphinx has all mandatory deps
328	exit (0) if ($version_check);
329}
330
331#
332# Ancillary subroutines
333#
334
335sub catcheck($)
336{
337  my $res = "";
338  $res = qx(cat $_[0]) if (-r $_[0]);
339  return $res;
340}
341
342sub which($)
343{
344	my $file = shift;
345	my @path = split ":", $ENV{PATH};
346
347	foreach my $dir(@path) {
348		my $name = $dir.'/'.$file;
349		return $name if (-x $name );
350	}
351	return undef;
352}
353
354#
355# Subroutines that check distro-specific hints
356#
357
358sub give_debian_hints()
359{
360	my %map = (
361		"python-sphinx"		=> "python3-sphinx",
362		"sphinx_rtd_theme"	=> "python3-sphinx-rtd-theme",
363		"ensurepip"		=> "python3-venv",
364		"virtualenv"		=> "virtualenv",
365		"dot"			=> "graphviz",
366		"convert"		=> "imagemagick",
367		"Pod::Usage"		=> "perl-modules",
368		"xelatex"		=> "texlive-xetex",
369		"rsvg-convert"		=> "librsvg2-bin",
370	);
371
372	if ($pdf) {
373		check_missing_file(["/usr/share/fonts/truetype/dejavu/DejaVuSans.ttf"],
374				   "fonts-dejavu", 2);
375
376		check_missing_file(["/usr/share/fonts/noto-cjk/NotoSansCJK-Regular.ttc",
377				    "/usr/share/fonts/opentype/noto/NotoSansCJK-Regular.ttc",
378				    "/usr/share/fonts/opentype/noto/NotoSerifCJK-Regular.ttc"],
379				   "fonts-noto-cjk", 2);
380	}
381
382	check_program("dvipng", 2) if ($pdf);
383	check_missing(\%map);
384
385	return if (!$need && !$optional);
386	printf("You should run:\n\n\tsudo apt-get install $install\n");
387}
388
389sub give_redhat_hints()
390{
391	my %map = (
392		"python-sphinx"		=> "python3-sphinx",
393		"sphinx_rtd_theme"	=> "python3-sphinx_rtd_theme",
394		"virtualenv"		=> "python3-virtualenv",
395		"dot"			=> "graphviz",
396		"convert"		=> "ImageMagick",
397		"Pod::Usage"		=> "perl-Pod-Usage",
398		"xelatex"		=> "texlive-xetex-bin",
399		"rsvg-convert"		=> "librsvg2-tools",
400	);
401
402	my @fedora26_opt_pkgs = (
403		"graphviz-gd",		# Fedora 26: needed for PDF support
404	);
405
406	my @fedora_tex_pkgs = (
407		"texlive-collection-fontsrecommended",
408		"texlive-collection-latex",
409		"texlive-xecjk",
410		"dejavu-sans-fonts",
411		"dejavu-serif-fonts",
412		"dejavu-sans-mono-fonts",
413	);
414
415	#
416	# Checks valid for RHEL/CentOS version 7.x.
417	#
418	my $old = 0;
419	my $rel;
420	$rel = $1 if ($system_release =~ /release\s+(\d+)/);
421
422	if (!($system_release =~ /Fedora/)) {
423		$map{"virtualenv"} = "python-virtualenv";
424
425		if ($rel && $rel < 8) {
426			$old = 1;
427			$pdf = 0;
428
429			printf("Note: texlive packages on RHEL/CENTOS <= 7 are incomplete. Can't support PDF output\n");
430			printf("If you want to build PDF, please read:\n");
431			printf("\thttps://www.systutorials.com/241660/how-to-install-tex-live-on-centos-7-linux/\n");
432		}
433	} else {
434		if ($rel && $rel < 26) {
435			$old = 1;
436		}
437	}
438	if (!$rel) {
439		printf("Couldn't identify release number\n");
440		$old = 1;
441		$pdf = 0;
442	}
443
444	if ($pdf) {
445		check_missing_file(["/usr/share/fonts/google-noto-cjk/NotoSansCJK-Regular.ttc"],
446				   "google-noto-sans-cjk-ttc-fonts", 2);
447	}
448
449	check_rpm_missing(\@fedora26_opt_pkgs, 2) if ($pdf && !$old);
450	check_rpm_missing(\@fedora_tex_pkgs, 2) if ($pdf);
451	check_missing_tex(2) if ($pdf);
452	check_missing(\%map);
453
454	return if (!$need && !$optional);
455
456	if (!$old) {
457		# dnf, for Fedora 18+
458		printf("You should run:\n\n\tsudo dnf install -y $install\n");
459	} else {
460		# yum, for RHEL (and clones) or Fedora version < 18
461		printf("You should run:\n\n\tsudo yum install -y $install\n");
462	}
463}
464
465sub give_opensuse_hints()
466{
467	my %map = (
468		"python-sphinx"		=> "python3-sphinx",
469		"sphinx_rtd_theme"	=> "python3-sphinx_rtd_theme",
470		"virtualenv"		=> "python3-virtualenv",
471		"dot"			=> "graphviz",
472		"convert"		=> "ImageMagick",
473		"Pod::Usage"		=> "perl-Pod-Usage",
474		"xelatex"		=> "texlive-xetex-bin",
475	);
476
477	# On Tumbleweed, this package is also named rsvg-convert
478	$map{"rsvg-convert"} = "rsvg-view" if (!($system_release =~ /Tumbleweed/));
479
480	my @suse_tex_pkgs = (
481		"texlive-babel-english",
482		"texlive-caption",
483		"texlive-colortbl",
484		"texlive-courier",
485		"texlive-dvips",
486		"texlive-helvetic",
487		"texlive-makeindex",
488		"texlive-metafont",
489		"texlive-metapost",
490		"texlive-palatino",
491		"texlive-preview",
492		"texlive-times",
493		"texlive-zapfchan",
494		"texlive-zapfding",
495	);
496
497	$map{"latexmk"} = "texlive-latexmk-bin";
498
499	# FIXME: add support for installing CJK fonts
500	#
501	# I tried hard, but was unable to find a way to install
502	# "Noto Sans CJK SC" on openSUSE
503
504	check_rpm_missing(\@suse_tex_pkgs, 2) if ($pdf);
505	check_missing_tex(2) if ($pdf);
506	check_missing(\%map);
507
508	return if (!$need && !$optional);
509	printf("You should run:\n\n\tsudo zypper install --no-recommends $install\n");
510}
511
512sub give_mageia_hints()
513{
514	my %map = (
515		"python-sphinx"		=> "python3-sphinx",
516		"sphinx_rtd_theme"	=> "python3-sphinx_rtd_theme",
517		"virtualenv"		=> "python3-virtualenv",
518		"dot"			=> "graphviz",
519		"convert"		=> "ImageMagick",
520		"Pod::Usage"		=> "perl-Pod-Usage",
521		"xelatex"		=> "texlive",
522		"rsvg-convert"		=> "librsvg2",
523	);
524
525	my @tex_pkgs = (
526		"texlive-fontsextra",
527	);
528
529	$map{"latexmk"} = "texlive-collection-basic";
530
531	my $packager_cmd;
532	my $noto_sans;
533	if ($system_release =~ /OpenMandriva/) {
534		$packager_cmd = "dnf install";
535		$noto_sans = "noto-sans-cjk-fonts";
536		@tex_pkgs = ( "texlive-collection-fontsextra" );
537	} else {
538		$packager_cmd = "urpmi";
539		$noto_sans = "google-noto-sans-cjk-ttc-fonts";
540	}
541
542
543	if ($pdf) {
544		check_missing_file(["/usr/share/fonts/google-noto-cjk/NotoSansCJK-Regular.ttc",
545				    "/usr/share/fonts/TTF/NotoSans-Regular.ttf"],
546				   $noto_sans, 2);
547	}
548
549	check_rpm_missing(\@tex_pkgs, 2) if ($pdf);
550	check_missing(\%map);
551
552	return if (!$need && !$optional);
553	printf("You should run:\n\n\tsudo $packager_cmd $install\n");
554}
555
556sub give_arch_linux_hints()
557{
558	my %map = (
559		"sphinx_rtd_theme"	=> "python-sphinx_rtd_theme",
560		"virtualenv"		=> "python-virtualenv",
561		"dot"			=> "graphviz",
562		"convert"		=> "imagemagick",
563		"xelatex"		=> "texlive-bin",
564		"latexmk"		=> "texlive-core",
565		"rsvg-convert"		=> "extra/librsvg",
566	);
567
568	my @archlinux_tex_pkgs = (
569		"texlive-core",
570		"texlive-latexextra",
571		"ttf-dejavu",
572	);
573	check_pacman_missing(\@archlinux_tex_pkgs, 2) if ($pdf);
574
575	if ($pdf) {
576		check_missing_file(["/usr/share/fonts/noto-cjk/NotoSansCJK-Regular.ttc"],
577				   "noto-fonts-cjk", 2);
578	}
579
580	check_missing(\%map);
581
582	return if (!$need && !$optional);
583	printf("You should run:\n\n\tsudo pacman -S $install\n");
584}
585
586sub give_gentoo_hints()
587{
588	my %map = (
589		"sphinx_rtd_theme"	=> "dev-python/sphinx_rtd_theme",
590		"virtualenv"		=> "dev-python/virtualenv",
591		"dot"			=> "media-gfx/graphviz",
592		"convert"		=> "media-gfx/imagemagick",
593		"xelatex"		=> "dev-texlive/texlive-xetex media-fonts/dejavu",
594		"rsvg-convert"		=> "gnome-base/librsvg",
595	);
596
597	check_missing_file(["/usr/share/fonts/dejavu/DejaVuSans.ttf"],
598			   "media-fonts/dejavu", 2) if ($pdf);
599
600	if ($pdf) {
601		check_missing_file(["/usr/share/fonts/noto-cjk/NotoSansCJKsc-Regular.otf",
602				    "/usr/share/fonts/noto-cjk/NotoSerifCJK-Regular.ttc"],
603				   "media-fonts/noto-cjk", 2);
604	}
605
606	check_missing(\%map);
607
608	return if (!$need && !$optional);
609
610	printf("You should run:\n\n");
611
612	my $imagemagick = "media-gfx/imagemagick svg png";
613	my $cairo = "media-gfx/graphviz cairo pdf";
614	my $portage_imagemagick = "/etc/portage/package.use/imagemagick";
615	my $portage_cairo = "/etc/portage/package.use/graphviz";
616
617	if (qx(grep imagemagick $portage_imagemagick 2>/dev/null) eq "") {
618		printf("\tsudo su -c 'echo \"$imagemagick\" > $portage_imagemagick'\n")
619	}
620	if (qx(grep graphviz $portage_cairo 2>/dev/null) eq  "") {
621		printf("\tsudo su -c 'echo \"$cairo\" > $portage_cairo'\n");
622	}
623
624	printf("\tsudo emerge --ask $install\n");
625
626}
627
628sub check_distros()
629{
630	# Distro-specific hints
631	if ($system_release =~ /Red Hat Enterprise Linux/) {
632		give_redhat_hints;
633		return;
634	}
635	if ($system_release =~ /CentOS/) {
636		give_redhat_hints;
637		return;
638	}
639	if ($system_release =~ /Scientific Linux/) {
640		give_redhat_hints;
641		return;
642	}
643	if ($system_release =~ /Oracle Linux Server/) {
644		give_redhat_hints;
645		return;
646	}
647	if ($system_release =~ /Fedora/) {
648		give_redhat_hints;
649		return;
650	}
651	if ($system_release =~ /Ubuntu/) {
652		give_debian_hints;
653		return;
654	}
655	if ($system_release =~ /Debian/) {
656		give_debian_hints;
657		return;
658	}
659	if ($system_release =~ /openSUSE/) {
660		give_opensuse_hints;
661		return;
662	}
663	if ($system_release =~ /Mageia/) {
664		give_mageia_hints;
665		return;
666	}
667	if ($system_release =~ /OpenMandriva/) {
668		give_mageia_hints;
669		return;
670	}
671	if ($system_release =~ /Arch Linux/) {
672		give_arch_linux_hints;
673		return;
674	}
675	if ($system_release =~ /Gentoo/) {
676		give_gentoo_hints;
677		return;
678	}
679
680	#
681	# Fall-back to generic hint code for other distros
682	# That's far from ideal, specially for LaTeX dependencies.
683	#
684	my %map = (
685		"sphinx-build" => "sphinx"
686	);
687	check_missing_tex(2) if ($pdf);
688	check_missing(\%map);
689	print "I don't know distro $system_release.\n";
690	print "So, I can't provide you a hint with the install procedure.\n";
691	print "There are likely missing dependencies.\n";
692}
693
694#
695# Common dependencies
696#
697
698sub deactivate_help()
699{
700	printf "\nIf you want to exit the virtualenv, you can use:\n";
701	printf "\tdeactivate\n";
702}
703
704sub check_needs()
705{
706	# Check if Sphinx is already accessible from current environment
707	check_sphinx();
708
709	if ($system_release) {
710		print "Detected OS: $system_release.\n";
711	} else {
712		print "Unknown OS\n";
713	}
714	printf "Sphinx version: %s\n\n", $cur_version if ($cur_version);
715
716	# Check python command line, trying first python3
717	$python_cmd = findprog("python3");
718	$python_cmd = check_program("python", 0) if (!$python_cmd);
719
720	# Check the type of virtual env, depending on Python version
721	if ($python_cmd) {
722		if ($virtualenv) {
723			my $tmp = qx($python_cmd --version 2>&1);
724			if ($tmp =~ m/(\d+\.)(\d+\.)/) {
725				if ($1 >= 3 && $2 >= 3) {
726					$need_venv = 1;		# python 3.3 or upper
727				} else {
728					$need_virtualenv = 1;
729				}
730				if ($1 < 3) {
731					# Fail if it finds python2 (or worse)
732					die "Python 3 is required to build the kernel docs\n";
733				}
734			} else {
735				die "Warning: couldn't identify $python_cmd version!";
736			}
737		} else {
738			add_package("python-sphinx", 0);
739		}
740	}
741
742	# Set virtualenv command line, if python < 3.3
743	my $virtualenv_cmd;
744	if ($need_virtualenv) {
745		$virtualenv_cmd = findprog("virtualenv-3");
746		$virtualenv_cmd = findprog("virtualenv-3.5") if (!$virtualenv_cmd);
747		if (!$virtualenv_cmd) {
748			check_program("virtualenv", 0);
749			$virtualenv_cmd = "virtualenv";
750		}
751	}
752
753	# Check for needed programs/tools
754	check_perl_module("Pod::Usage", 0);
755	check_program("make", 0);
756	check_program("gcc", 0);
757	check_python_module("sphinx_rtd_theme", 1) if (!$virtualenv);
758	check_program("dot", 1);
759	check_program("convert", 1);
760
761	# Extra PDF files - should use 2 for is_optional
762	check_program("xelatex", 2) if ($pdf);
763	check_program("rsvg-convert", 2) if ($pdf);
764	check_program("latexmk", 2) if ($pdf);
765
766	if ($need_sphinx || $rec_sphinx_upgrade) {
767		check_python_module("ensurepip", 0) if ($need_venv);
768	}
769
770	# Do distro-specific checks and output distro-install commands
771	check_distros();
772
773	if (!$python_cmd) {
774		if ($need == 1) {
775			die "Can't build as $need mandatory dependency is missing";
776		} elsif ($need) {
777			die "Can't build as $need mandatory dependencies are missing";
778		}
779	}
780
781	# Check if sphinx-build is called sphinx-build-3
782	if ($need_symlink) {
783		printf "\tsudo ln -sf %s /usr/bin/sphinx-build\n\n",
784		       which("sphinx-build-3");
785	}
786
787	# NOTE: if the system has a too old Sphinx version installed,
788	# it will recommend installing a newer version using virtualenv
789
790	if ($need_sphinx || $rec_sphinx_upgrade) {
791		my $min_activate = "$ENV{'PWD'}/${virtenv_prefix}${min_version}/bin/activate";
792		my @activates = glob "$ENV{'PWD'}/${virtenv_prefix}*/bin/activate";
793
794		if ($cur_version lt $rec_version) {
795			print "Warning: It is recommended at least Sphinx version $rec_version.\n";
796			print "         If you want pdf, you need at least $min_pdf_version.\n";
797		}
798		if ($cur_version lt $min_pdf_version) {
799			print "Note: It is recommended at least Sphinx version $min_pdf_version if you need PDF support.\n";
800		}
801		@activates = sort {$b cmp $a} @activates;
802		my ($activate, $ver);
803		foreach my $f (@activates) {
804			next if ($f lt $min_activate);
805
806			my $sphinx_cmd = $f;
807			$sphinx_cmd =~ s/activate/sphinx-build/;
808			next if (! -f $sphinx_cmd);
809
810			$ver = get_sphinx_version($sphinx_cmd);
811			if ($need_sphinx && ($ver ge $min_version)) {
812				$activate = $f;
813				last;
814			} elsif ($ver gt $cur_version) {
815				$activate = $f;
816				last;
817			}
818		}
819		if ($activate ne "") {
820			if ($need_sphinx) {
821				printf "\nNeed to activate Sphinx (version $ver) on virtualenv with:\n";
822				printf "\t. $activate\n";
823				deactivate_help();
824				exit (1);
825			} else {
826				printf "\nYou may also use a newer Sphinx (version $ver) with:\n";
827				printf "\tdeactivate && . $activate\n";
828			}
829		} else {
830			my $rec_activate = "$virtenv_dir/bin/activate";
831
832			print "To upgrade Sphinx, use:\n\n" if ($rec_sphinx_upgrade);
833
834			$python_cmd = find_python_no_venv();
835
836			if ($need_venv) {
837				printf "\t$python_cmd -m venv $virtenv_dir\n";
838			} else {
839				printf "\t$virtualenv_cmd $virtenv_dir\n";
840			}
841			printf "\t. $rec_activate\n";
842			printf "\tpip install -r $requirement_file\n";
843			deactivate_help();
844
845			$need++ if (!$rec_sphinx_upgrade);
846		}
847	}
848	printf "\n";
849
850	print "All optional dependencies are met.\n" if (!$optional);
851
852	if ($need == 1) {
853		die "Can't build as $need mandatory dependency is missing";
854	} elsif ($need) {
855		die "Can't build as $need mandatory dependencies are missing";
856	}
857
858	print "Needed package dependencies are met.\n";
859}
860
861#
862# Main
863#
864
865while (@ARGV) {
866	my $arg = shift(@ARGV);
867
868	if ($arg eq "--no-virtualenv") {
869		$virtualenv = 0;
870	} elsif ($arg eq "--no-pdf"){
871		$pdf = 0;
872	} elsif ($arg eq "--version-check"){
873		$version_check = 1;
874	} else {
875		print "Usage:\n\t$0 <--no-virtualenv> <--no-pdf> <--version-check>\n\n";
876		print "Where:\n";
877		print "\t--no-virtualenv\t- Recommend installing Sphinx instead of using a virtualenv\n";
878		print "\t--version-check\t- if version is compatible, don't check for missing dependencies\n";
879		print "\t--no-pdf\t- don't check for dependencies required to build PDF docs\n\n";
880		exit -1;
881	}
882}
883
884#
885# Determine the system type. There's no standard unique way that would
886# work with all distros with a minimal package install. So, several
887# methods are used here.
888#
889# By default, it will use lsb_release function. If not available, it will
890# fail back to reading the known different places where the distro name
891# is stored
892#
893
894$system_release = qx(lsb_release -d) if which("lsb_release");
895$system_release =~ s/Description:\s*// if ($system_release);
896$system_release = catcheck("/etc/system-release") if !$system_release;
897$system_release = catcheck("/etc/redhat-release") if !$system_release;
898$system_release = catcheck("/etc/lsb-release") if !$system_release;
899$system_release = catcheck("/etc/gentoo-release") if !$system_release;
900
901# This seems more common than LSB these days
902if (!$system_release) {
903	my %os_var;
904	if (open IN, "cat /etc/os-release|") {
905		while (<IN>) {
906			if (m/^([\w\d\_]+)=\"?([^\"]*)\"?\n/) {
907				$os_var{$1}=$2;
908			}
909		}
910		$system_release = $os_var{"NAME"};
911		if (defined($os_var{"VERSION_ID"})) {
912			$system_release .= " " . $os_var{"VERSION_ID"} if (defined($os_var{"VERSION_ID"}));
913		} else {
914			$system_release .= " " . $os_var{"VERSION"};
915		}
916	}
917}
918$system_release = catcheck("/etc/issue") if !$system_release;
919$system_release =~ s/\s+$//;
920
921check_needs;
922