f2fs: Provide a splice-read wrapper
[linux-block.git] / scripts / sphinx-pre-install
1 #!/usr/bin/env perl
2 # SPDX-License-Identifier: GPL-2.0-or-later
3 use strict;
4
5 # Copyright (c) 2017-2020 Mauro Carvalho Chehab <mchehab@kernel.org>
6 #
7
8 my $prefix = "./";
9 $prefix = "$ENV{'srctree'}/" if ($ENV{'srctree'});
10
11 my $conf = $prefix . "Documentation/conf.py";
12 my $requirement_file = $prefix . "Documentation/sphinx/requirements.txt";
13 my $virtenv_prefix = "sphinx_";
14
15 #
16 # Static vars
17 #
18
19 my %missing;
20 my $system_release;
21 my $need = 0;
22 my $optional = 0;
23 my $need_symlink = 0;
24 my $need_sphinx = 0;
25 my $need_pip = 0;
26 my $need_virtualenv = 0;
27 my $rec_sphinx_upgrade = 0;
28 my $verbose_warn_install = 1;
29 my $install = "";
30 my $virtenv_dir = "";
31 my $python_cmd = "";
32 my $activate_cmd;
33 my $min_version;
34 my $cur_version;
35 my $rec_version = "1.7.9";      # PDF won't build here
36 my $min_pdf_version = "2.4.4";  # Min version where pdf builds
37 my $latest_avail_ver;
38
39 #
40 # Command line arguments
41 #
42
43 my $pdf = 1;
44 my $virtualenv = 1;
45 my $version_check = 0;
46
47 #
48 # List of required texlive packages on Fedora and OpenSuse
49 #
50
51 my %texlive = (
52         'amsfonts.sty'       => 'texlive-amsfonts',
53         'amsmath.sty'        => 'texlive-amsmath',
54         'amssymb.sty'        => 'texlive-amsfonts',
55         'amsthm.sty'         => 'texlive-amscls',
56         'anyfontsize.sty'    => 'texlive-anyfontsize',
57         'atbegshi.sty'       => 'texlive-oberdiek',
58         'bm.sty'             => 'texlive-tools',
59         'capt-of.sty'        => 'texlive-capt-of',
60         'cmap.sty'           => 'texlive-cmap',
61         'ecrm1000.tfm'       => 'texlive-ec',
62         'eqparbox.sty'       => 'texlive-eqparbox',
63         'eu1enc.def'         => 'texlive-euenc',
64         'fancybox.sty'       => 'texlive-fancybox',
65         'fancyvrb.sty'       => 'texlive-fancyvrb',
66         'float.sty'          => 'texlive-float',
67         'fncychap.sty'       => 'texlive-fncychap',
68         'footnote.sty'       => 'texlive-mdwtools',
69         'framed.sty'         => 'texlive-framed',
70         'luatex85.sty'       => 'texlive-luatex85',
71         'multirow.sty'       => 'texlive-multirow',
72         'needspace.sty'      => 'texlive-needspace',
73         'palatino.sty'       => 'texlive-psnfss',
74         'parskip.sty'        => 'texlive-parskip',
75         'polyglossia.sty'    => 'texlive-polyglossia',
76         'tabulary.sty'       => 'texlive-tabulary',
77         'threeparttable.sty' => 'texlive-threeparttable',
78         'titlesec.sty'       => 'texlive-titlesec',
79         'ucs.sty'            => 'texlive-ucs',
80         'upquote.sty'        => 'texlive-upquote',
81         'wrapfig.sty'        => 'texlive-wrapfig',
82         'ctexhook.sty'       => 'texlive-ctex',
83 );
84
85 #
86 # Subroutines that checks if a feature exists
87 #
88
89 sub check_missing(%)
90 {
91         my %map = %{$_[0]};
92
93         foreach my $prog (sort keys %missing) {
94                 my $is_optional = $missing{$prog};
95
96                 # At least on some LTS distros like CentOS 7, texlive doesn't
97                 # provide all packages we need. When such distros are
98                 # detected, we have to disable PDF output.
99                 #
100                 # So, we need to ignore the packages that distros would
101                 # need for LaTeX to work
102                 if ($is_optional == 2 && !$pdf) {
103                         $optional--;
104                         next;
105                 }
106
107                 if ($verbose_warn_install) {
108                         if ($is_optional) {
109                                 print "Warning: better to also install \"$prog\".\n";
110                         } else {
111                                 print "ERROR: please install \"$prog\", otherwise, build won't work.\n";
112                         }
113                 }
114                 if (defined($map{$prog})) {
115                         $install .= " " . $map{$prog};
116                 } else {
117                         $install .= " " . $prog;
118                 }
119         }
120
121         $install =~ s/^\s//;
122 }
123
124 sub add_package($$)
125 {
126         my $package = shift;
127         my $is_optional = shift;
128
129         $missing{$package} = $is_optional;
130         if ($is_optional) {
131                 $optional++;
132         } else {
133                 $need++;
134         }
135 }
136
137 sub check_missing_file($$$)
138 {
139         my $files = shift;
140         my $package = shift;
141         my $is_optional = shift;
142
143         for (@$files) {
144                 return if(-e $_);
145         }
146
147         add_package($package, $is_optional);
148 }
149
150 sub findprog($)
151 {
152         foreach(split(/:/, $ENV{PATH})) {
153                 return "$_/$_[0]" if(-x "$_/$_[0]");
154         }
155 }
156
157 sub find_python_no_venv()
158 {
159         my $prog = shift;
160
161         my $cur_dir = qx(pwd);
162         $cur_dir =~ s/\s+$//;
163
164         foreach my $dir (split(/:/, $ENV{PATH})) {
165                 next if ($dir =~ m,($cur_dir)/sphinx,);
166                 return "$dir/python3" if(-x "$dir/python3");
167         }
168         foreach my $dir (split(/:/, $ENV{PATH})) {
169                 next if ($dir =~ m,($cur_dir)/sphinx,);
170                 return "$dir/python" if(-x "$dir/python");
171         }
172         return "python";
173 }
174
175 sub check_program($$)
176 {
177         my $prog = shift;
178         my $is_optional = shift;
179
180         return $prog if findprog($prog);
181
182         add_package($prog, $is_optional);
183 }
184
185 sub check_perl_module($$)
186 {
187         my $prog = shift;
188         my $is_optional = shift;
189
190         my $err = system("perl -M$prog -e 1 2>/dev/null /dev/null");
191         return if ($err == 0);
192
193         add_package($prog, $is_optional);
194 }
195
196 sub check_python_module($$)
197 {
198         my $prog = shift;
199         my $is_optional = shift;
200
201         return if (!$python_cmd);
202
203         my $err = system("$python_cmd -c 'import $prog' 2>/dev/null /dev/null");
204         return if ($err == 0);
205
206         add_package($prog, $is_optional);
207 }
208
209 sub check_rpm_missing($$)
210 {
211         my @pkgs = @{$_[0]};
212         my $is_optional = $_[1];
213
214         foreach my $prog(@pkgs) {
215                 my $err = system("rpm -q '$prog' 2>/dev/null >/dev/null");
216                 add_package($prog, $is_optional) if ($err);
217         }
218 }
219
220 sub check_pacman_missing($$)
221 {
222         my @pkgs = @{$_[0]};
223         my $is_optional = $_[1];
224
225         foreach my $prog(@pkgs) {
226                 my $err = system("pacman -Q '$prog' 2>/dev/null >/dev/null");
227                 add_package($prog, $is_optional) if ($err);
228         }
229 }
230
231 sub check_missing_tex($)
232 {
233         my $is_optional = shift;
234         my $kpsewhich = findprog("kpsewhich");
235
236         foreach my $prog(keys %texlive) {
237                 my $package = $texlive{$prog};
238                 if (!$kpsewhich) {
239                         add_package($package, $is_optional);
240                         next;
241                 }
242                 my $file = qx($kpsewhich $prog);
243                 add_package($package, $is_optional) if ($file =~ /^\s*$/);
244         }
245 }
246
247 sub get_sphinx_fname()
248 {
249         my $fname = "sphinx-build";
250         return $fname if findprog($fname);
251
252         $fname = "sphinx-build-3";
253         if (findprog($fname)) {
254                 $need_symlink = 1;
255                 return $fname;
256         }
257
258         return "";
259 }
260
261 sub get_sphinx_version($)
262 {
263         my $cmd = shift;
264         my $ver;
265
266         open IN, "$cmd --version 2>&1 |";
267         while (<IN>) {
268                 if (m/^\s*sphinx-build\s+([\d\.]+)((\+\/[\da-f]+)|(b\d+))?$/) {
269                         $ver=$1;
270                         last;
271                 }
272                 # Sphinx 1.2.x uses a different format
273                 if (m/^\s*Sphinx.*\s+([\d\.]+)$/) {
274                         $ver=$1;
275                         last;
276                 }
277         }
278         close IN;
279         return $ver;
280 }
281
282 sub check_sphinx()
283 {
284         my $default_version;
285
286         open IN, $conf or die "Can't open $conf";
287         while (<IN>) {
288                 if (m/^\s*needs_sphinx\s*=\s*[\'\"]([\d\.]+)[\'\"]/) {
289                         $min_version=$1;
290                         last;
291                 }
292         }
293         close IN;
294
295         die "Can't get needs_sphinx version from $conf" if (!$min_version);
296
297         open IN, $requirement_file or die "Can't open $requirement_file";
298         while (<IN>) {
299                 if (m/^\s*Sphinx\s*==\s*([\d\.]+)$/) {
300                         $default_version=$1;
301                         last;
302                 }
303         }
304         close IN;
305
306         die "Can't get default sphinx version from $requirement_file" if (!$default_version);
307
308         $virtenv_dir = $virtenv_prefix . $default_version;
309
310         my $sphinx = get_sphinx_fname();
311         if ($sphinx eq "") {
312                 $need_sphinx = 1;
313                 return;
314         }
315
316         $cur_version = get_sphinx_version($sphinx);
317         die ("$sphinx returned an error") if (!$cur_version);
318
319         die "$sphinx didn't return its version" if (!$cur_version);
320
321         if ($cur_version lt $min_version) {
322                 printf "ERROR: Sphinx version is %s. It should be >= %s (recommended >= %s)\n",
323                        $cur_version, $min_version, $default_version;
324                 $need_sphinx = 1;
325                 return;
326         }
327
328         return if ($cur_version lt $rec_version);
329
330         # On version check mode, just assume Sphinx has all mandatory deps
331         exit (0) if ($version_check);
332 }
333
334 #
335 # Ancillary subroutines
336 #
337
338 sub catcheck($)
339 {
340   my $res = "";
341   $res = qx(cat $_[0]) if (-r $_[0]);
342   return $res;
343 }
344
345 sub which($)
346 {
347         my $file = shift;
348         my @path = split ":", $ENV{PATH};
349
350         foreach my $dir(@path) {
351                 my $name = $dir.'/'.$file;
352                 return $name if (-x $name );
353         }
354         return undef;
355 }
356
357 #
358 # Subroutines that check distro-specific hints
359 #
360
361 sub give_debian_hints()
362 {
363         my %map = (
364                 "python-sphinx"         => "python3-sphinx",
365                 "ensurepip"             => "python3-venv",
366                 "virtualenv"            => "virtualenv",
367                 "dot"                   => "graphviz",
368                 "convert"               => "imagemagick",
369                 "Pod::Usage"            => "perl-modules",
370                 "xelatex"               => "texlive-xetex",
371                 "rsvg-convert"          => "librsvg2-bin",
372         );
373
374         if ($pdf) {
375                 check_missing_file(["/usr/share/texlive/texmf-dist/tex/latex/ctex/ctexhook.sty"],
376                                    "texlive-lang-chinese", 2);
377
378                 check_missing_file(["/usr/share/fonts/truetype/dejavu/DejaVuSans.ttf"],
379                                    "fonts-dejavu", 2);
380
381                 check_missing_file(["/usr/share/fonts/noto-cjk/NotoSansCJK-Regular.ttc",
382                                     "/usr/share/fonts/opentype/noto/NotoSansCJK-Regular.ttc",
383                                     "/usr/share/fonts/opentype/noto/NotoSerifCJK-Regular.ttc"],
384                                    "fonts-noto-cjk", 2);
385         }
386
387         check_program("dvipng", 2) if ($pdf);
388         check_missing(\%map);
389
390         return if (!$need && !$optional);
391         printf("You should run:\n") if ($verbose_warn_install);
392         printf("\n\tsudo apt-get install $install\n");
393 }
394
395 sub give_redhat_hints()
396 {
397         my %map = (
398                 "python-sphinx"         => "python3-sphinx",
399                 "virtualenv"            => "python3-virtualenv",
400                 "dot"                   => "graphviz",
401                 "convert"               => "ImageMagick",
402                 "Pod::Usage"            => "perl-Pod-Usage",
403                 "xelatex"               => "texlive-xetex-bin",
404                 "rsvg-convert"          => "librsvg2-tools",
405         );
406
407         my @fedora26_opt_pkgs = (
408                 "graphviz-gd",          # Fedora 26: needed for PDF support
409         );
410
411         my @fedora_tex_pkgs = (
412                 "texlive-collection-fontsrecommended",
413                 "texlive-collection-latex",
414                 "texlive-xecjk",
415                 "dejavu-sans-fonts",
416                 "dejavu-serif-fonts",
417                 "dejavu-sans-mono-fonts",
418         );
419
420         #
421         # Checks valid for RHEL/CentOS version 7.x.
422         #
423         my $old = 0;
424         my $rel;
425         $rel = $1 if ($system_release =~ /release\s+(\d+)/);
426
427         if (!($system_release =~ /Fedora/)) {
428                 $map{"virtualenv"} = "python-virtualenv";
429
430                 if ($rel && $rel < 8) {
431                         $old = 1;
432                         $pdf = 0;
433
434                         printf("Note: texlive packages on RHEL/CENTOS <= 7 are incomplete. Can't support PDF output\n");
435                         printf("If you want to build PDF, please read:\n");
436                         printf("\thttps://www.systutorials.com/241660/how-to-install-tex-live-on-centos-7-linux/\n");
437                 }
438         } else {
439                 if ($rel && $rel < 26) {
440                         $old = 1;
441                 }
442         }
443         if (!$rel) {
444                 printf("Couldn't identify release number\n");
445                 $old = 1;
446                 $pdf = 0;
447         }
448
449         if ($pdf) {
450                 check_missing_file(["/usr/share/fonts/google-noto-cjk/NotoSansCJK-Regular.ttc"],
451                                    "google-noto-sans-cjk-ttc-fonts", 2);
452         }
453
454         check_rpm_missing(\@fedora26_opt_pkgs, 2) if ($pdf && !$old);
455         check_rpm_missing(\@fedora_tex_pkgs, 2) if ($pdf);
456         check_missing_tex(2) if ($pdf);
457         check_missing(\%map);
458
459         return if (!$need && !$optional);
460
461         if (!$old) {
462                 # dnf, for Fedora 18+
463                 printf("You should run:\n") if ($verbose_warn_install);
464                 printf("\n\tsudo dnf install -y $install\n");
465         } else {
466                 # yum, for RHEL (and clones) or Fedora version < 18
467                 printf("You should run:\n") if ($verbose_warn_install);
468                 printf("\n\tsudo yum install -y $install\n");
469         }
470 }
471
472 sub give_opensuse_hints()
473 {
474         my %map = (
475                 "python-sphinx"         => "python3-sphinx",
476                 "virtualenv"            => "python3-virtualenv",
477                 "dot"                   => "graphviz",
478                 "convert"               => "ImageMagick",
479                 "Pod::Usage"            => "perl-Pod-Usage",
480                 "xelatex"               => "texlive-xetex-bin",
481         );
482
483         # On Tumbleweed, this package is also named rsvg-convert
484         $map{"rsvg-convert"} = "rsvg-view" if (!($system_release =~ /Tumbleweed/));
485
486         my @suse_tex_pkgs = (
487                 "texlive-babel-english",
488                 "texlive-caption",
489                 "texlive-colortbl",
490                 "texlive-courier",
491                 "texlive-dvips",
492                 "texlive-helvetic",
493                 "texlive-makeindex",
494                 "texlive-metafont",
495                 "texlive-metapost",
496                 "texlive-palatino",
497                 "texlive-preview",
498                 "texlive-times",
499                 "texlive-zapfchan",
500                 "texlive-zapfding",
501         );
502
503         $map{"latexmk"} = "texlive-latexmk-bin";
504
505         # FIXME: add support for installing CJK fonts
506         #
507         # I tried hard, but was unable to find a way to install
508         # "Noto Sans CJK SC" on openSUSE
509
510         check_rpm_missing(\@suse_tex_pkgs, 2) if ($pdf);
511         check_missing_tex(2) if ($pdf);
512         check_missing(\%map);
513
514         return if (!$need && !$optional);
515         printf("You should run:\n") if ($verbose_warn_install);
516         printf("\n\tsudo zypper install --no-recommends $install\n");
517 }
518
519 sub give_mageia_hints()
520 {
521         my %map = (
522                 "python-sphinx"         => "python3-sphinx",
523                 "virtualenv"            => "python3-virtualenv",
524                 "dot"                   => "graphviz",
525                 "convert"               => "ImageMagick",
526                 "Pod::Usage"            => "perl-Pod-Usage",
527                 "xelatex"               => "texlive",
528                 "rsvg-convert"          => "librsvg2",
529         );
530
531         my @tex_pkgs = (
532                 "texlive-fontsextra",
533         );
534
535         $map{"latexmk"} = "texlive-collection-basic";
536
537         my $packager_cmd;
538         my $noto_sans;
539         if ($system_release =~ /OpenMandriva/) {
540                 $packager_cmd = "dnf install";
541                 $noto_sans = "noto-sans-cjk-fonts";
542                 @tex_pkgs = ( "texlive-collection-fontsextra" );
543         } else {
544                 $packager_cmd = "urpmi";
545                 $noto_sans = "google-noto-sans-cjk-ttc-fonts";
546         }
547
548
549         if ($pdf) {
550                 check_missing_file(["/usr/share/fonts/google-noto-cjk/NotoSansCJK-Regular.ttc",
551                                     "/usr/share/fonts/TTF/NotoSans-Regular.ttf"],
552                                    $noto_sans, 2);
553         }
554
555         check_rpm_missing(\@tex_pkgs, 2) if ($pdf);
556         check_missing(\%map);
557
558         return if (!$need && !$optional);
559         printf("You should run:\n") if ($verbose_warn_install);
560         printf("\n\tsudo $packager_cmd $install\n");
561 }
562
563 sub give_arch_linux_hints()
564 {
565         my %map = (
566                 "virtualenv"            => "python-virtualenv",
567                 "dot"                   => "graphviz",
568                 "convert"               => "imagemagick",
569                 "xelatex"               => "texlive-bin",
570                 "latexmk"               => "texlive-core",
571                 "rsvg-convert"          => "extra/librsvg",
572         );
573
574         my @archlinux_tex_pkgs = (
575                 "texlive-core",
576                 "texlive-latexextra",
577                 "ttf-dejavu",
578         );
579         check_pacman_missing(\@archlinux_tex_pkgs, 2) if ($pdf);
580
581         if ($pdf) {
582                 check_missing_file(["/usr/share/fonts/noto-cjk/NotoSansCJK-Regular.ttc"],
583                                    "noto-fonts-cjk", 2);
584         }
585
586         check_missing(\%map);
587
588         return if (!$need && !$optional);
589         printf("You should run:\n") if ($verbose_warn_install);
590         printf("\n\tsudo pacman -S $install\n");
591 }
592
593 sub give_gentoo_hints()
594 {
595         my %map = (
596                 "virtualenv"            => "dev-python/virtualenv",
597                 "dot"                   => "media-gfx/graphviz",
598                 "convert"               => "media-gfx/imagemagick",
599                 "xelatex"               => "dev-texlive/texlive-xetex media-fonts/dejavu",
600                 "rsvg-convert"          => "gnome-base/librsvg",
601         );
602
603         check_missing_file(["/usr/share/fonts/dejavu/DejaVuSans.ttf"],
604                            "media-fonts/dejavu", 2) if ($pdf);
605
606         if ($pdf) {
607                 check_missing_file(["/usr/share/fonts/noto-cjk/NotoSansCJKsc-Regular.otf",
608                                     "/usr/share/fonts/noto-cjk/NotoSerifCJK-Regular.ttc"],
609                                    "media-fonts/noto-cjk", 2);
610         }
611
612         check_missing(\%map);
613
614         return if (!$need && !$optional);
615
616         printf("You should run:\n") if ($verbose_warn_install);
617         printf("\n");
618
619         my $imagemagick = "media-gfx/imagemagick svg png";
620         my $cairo = "media-gfx/graphviz cairo pdf";
621         my $portage_imagemagick = "/etc/portage/package.use/imagemagick";
622         my $portage_cairo = "/etc/portage/package.use/graphviz";
623
624         if (qx(grep imagemagick $portage_imagemagick 2>/dev/null) eq "") {
625                 printf("\tsudo su -c 'echo \"$imagemagick\" > $portage_imagemagick'\n")
626         }
627         if (qx(grep graphviz $portage_cairo 2>/dev/null) eq  "") {
628                 printf("\tsudo su -c 'echo \"$cairo\" > $portage_cairo'\n");
629         }
630
631         printf("\tsudo emerge --ask $install\n");
632
633 }
634
635 sub check_distros()
636 {
637         # Distro-specific hints
638         if ($system_release =~ /Red Hat Enterprise Linux/) {
639                 give_redhat_hints;
640                 return;
641         }
642         if ($system_release =~ /CentOS/) {
643                 give_redhat_hints;
644                 return;
645         }
646         if ($system_release =~ /Scientific Linux/) {
647                 give_redhat_hints;
648                 return;
649         }
650         if ($system_release =~ /Oracle Linux Server/) {
651                 give_redhat_hints;
652                 return;
653         }
654         if ($system_release =~ /Fedora/) {
655                 give_redhat_hints;
656                 return;
657         }
658         if ($system_release =~ /Ubuntu/) {
659                 give_debian_hints;
660                 return;
661         }
662         if ($system_release =~ /Debian/) {
663                 give_debian_hints;
664                 return;
665         }
666         if ($system_release =~ /openSUSE/) {
667                 give_opensuse_hints;
668                 return;
669         }
670         if ($system_release =~ /Mageia/) {
671                 give_mageia_hints;
672                 return;
673         }
674         if ($system_release =~ /OpenMandriva/) {
675                 give_mageia_hints;
676                 return;
677         }
678         if ($system_release =~ /Arch Linux/) {
679                 give_arch_linux_hints;
680                 return;
681         }
682         if ($system_release =~ /Gentoo/) {
683                 give_gentoo_hints;
684                 return;
685         }
686
687         #
688         # Fall-back to generic hint code for other distros
689         # That's far from ideal, specially for LaTeX dependencies.
690         #
691         my %map = (
692                 "sphinx-build" => "sphinx"
693         );
694         check_missing_tex(2) if ($pdf);
695         check_missing(\%map);
696         print "I don't know distro $system_release.\n";
697         print "So, I can't provide you a hint with the install procedure.\n";
698         print "There are likely missing dependencies.\n";
699 }
700
701 #
702 # Common dependencies
703 #
704
705 sub deactivate_help()
706 {
707         printf "\n    If you want to exit the virtualenv, you can use:\n";
708         printf "\tdeactivate\n";
709 }
710
711 sub get_virtenv()
712 {
713         my $ver;
714         my $min_activate = "$ENV{'PWD'}/${virtenv_prefix}${min_version}/bin/activate";
715         my @activates = glob "$ENV{'PWD'}/${virtenv_prefix}*/bin/activate";
716
717         @activates = sort {$b cmp $a} @activates;
718
719         foreach my $f (@activates) {
720                 next if ($f lt $min_activate);
721
722                 my $sphinx_cmd = $f;
723                 $sphinx_cmd =~ s/activate/sphinx-build/;
724                 next if (! -f $sphinx_cmd);
725
726                 my $ver = get_sphinx_version($sphinx_cmd);
727
728                 if (!$ver) {
729                         $f =~ s#/bin/activate##;
730                         print("Warning: virtual environment $f is not working.\nPython version upgrade? Remove it with:\n\n\trm -rf $f\n\n");
731                 }
732
733                 if ($need_sphinx && ($ver ge $min_version)) {
734                         return ($f, $ver);
735                 } elsif ($ver gt $cur_version) {
736                         return ($f, $ver);
737                 }
738         }
739         return ("", "");
740 }
741
742 sub recommend_sphinx_upgrade()
743 {
744         my $venv_ver;
745
746         # Avoid running sphinx-builds from venv if $cur_version is good
747         if ($cur_version && ($cur_version ge $rec_version)) {
748                 $latest_avail_ver = $cur_version;
749                 return;
750         }
751
752         # Get the highest version from sphinx_*/bin/sphinx-build and the
753         # corresponding command to activate the venv/virtenv
754         ($activate_cmd, $venv_ver) = get_virtenv();
755
756         # Store the highest version from Sphinx existing virtualenvs
757         if (($activate_cmd ne "") && ($venv_ver gt $cur_version)) {
758                 $latest_avail_ver = $venv_ver;
759         } else {
760                 $latest_avail_ver = $cur_version if ($cur_version);
761         }
762
763         # As we don't know package version of Sphinx, and there's no
764         # virtual environments, don't check if upgrades are needed
765         if (!$virtualenv) {
766                 return if (!$latest_avail_ver);
767         }
768
769         # Either there are already a virtual env or a new one should be created
770         $need_pip = 1;
771
772         return if (!$latest_avail_ver);
773
774         # Return if the reason is due to an upgrade or not
775         if ($latest_avail_ver lt $rec_version) {
776                 $rec_sphinx_upgrade = 1;
777         }
778
779         return $latest_avail_ver;
780 }
781
782 #
783 # The logic here is complex, as it have to deal with different versions:
784 #       - minimal supported version;
785 #       - minimal PDF version;
786 #       - recommended version.
787 # It also needs to work fine with both distro's package and venv/virtualenv
788 sub recommend_sphinx_version($)
789 {
790         my $virtualenv_cmd = shift;
791
792         # Version is OK. Nothing to do.
793         if ($cur_version && ($cur_version ge $rec_version)) {
794                 if ($cur_version lt $min_pdf_version) {
795                         print "note: If you want pdf, you need at least Sphinx $min_pdf_version.\n";
796                 }
797                 return;
798         };
799
800         if (!$need_sphinx) {
801                 # sphinx-build is present and its version is >= $min_version
802
803                 #only recommend enabling a newer virtenv version if makes sense.
804                 if ($latest_avail_ver gt $cur_version) {
805                         printf "\nYou may also use the newer Sphinx version $latest_avail_ver with:\n";
806                         printf "\tdeactivate\n"  if ($ENV{'PWD'} =~ /${virtenv_prefix}/);
807                         printf "\t. $activate_cmd\n";
808                         deactivate_help();
809
810                         return;
811                 }
812                 return if ($latest_avail_ver ge $rec_version);
813         }
814
815         if (!$virtualenv) {
816                 # No sphinx either via package or via virtenv. As we can't
817                 # Compare the versions here, just return, recommending the
818                 # user to install it from the package distro.
819                 return if (!$latest_avail_ver);
820
821                 # User doesn't want a virtenv recommendation, but he already
822                 # installed one via virtenv with a newer version.
823                 # So, print commands to enable it
824                 if ($latest_avail_ver gt $cur_version) {
825                         printf "\nYou may also use the Sphinx virtualenv version $latest_avail_ver with:\n";
826                         printf "\tdeactivate\n"  if ($ENV{'PWD'} =~ /${virtenv_prefix}/);
827                         printf "\t. $activate_cmd\n";
828                         deactivate_help();
829
830                         return;
831                 }
832                 print "\n";
833         } else {
834                 $need++ if ($need_sphinx);
835         }
836
837         # Suggest newer versions if current ones are too old
838         if ($latest_avail_ver && $latest_avail_ver ge $min_version) {
839                 # If there's a good enough version, ask the user to enable it
840                 if ($latest_avail_ver ge $rec_version) {
841                         printf "\nNeed to activate Sphinx (version $latest_avail_ver) on virtualenv with:\n";
842                         printf "\t. $activate_cmd\n";
843                         deactivate_help();
844
845                         if ($latest_avail_ver lt $min_pdf_version) {
846                                 print "note: If you want pdf, you need at least Sphinx $min_pdf_version.\n";
847                         }
848
849                         return;
850                 }
851
852                 # Version is above the minimal required one, but may be
853                 # below the recommended one. So, print warnings/notes
854
855                 if ($latest_avail_ver lt $rec_version) {
856                         print "Warning: It is recommended at least Sphinx version $rec_version.\n";
857                 }
858         }
859
860         # At this point, either it needs Sphinx or upgrade is recommended,
861         # both via pip
862
863         if ($rec_sphinx_upgrade) {
864                 if (!$virtualenv) {
865                         print "Instead of install/upgrade Python Sphinx pkg, you could use pip/pypi with:\n\n";
866                 } else {
867                         print "To upgrade Sphinx, use:\n\n";
868                 }
869         } else {
870                 print "\nSphinx needs to be installed either:\n1) via pip/pypi with:\n\n";
871         }
872
873         $python_cmd = find_python_no_venv();
874
875         printf "\t$virtualenv_cmd $virtenv_dir\n";
876
877         printf "\t. $virtenv_dir/bin/activate\n";
878         printf "\tpip install -r $requirement_file\n";
879         deactivate_help();
880
881         printf "\n2) As a package with:\n";
882
883         my $old_need = $need;
884         my $old_optional = $optional;
885         %missing = ();
886         $pdf = 0;
887         $optional = 0;
888         $install = "";
889         $verbose_warn_install = 0;
890
891         add_package("python-sphinx", 0);
892
893         check_distros();
894
895         $need = $old_need;
896         $optional = $old_optional;
897
898         printf "\n    Please note that Sphinx >= 3.0 will currently produce false-positive\n";
899         printf "   warning when the same name is used for more than one type (functions,\n";
900         printf "   structs, enums,...). This is known Sphinx bug. For more details, see:\n";
901         printf "\thttps://github.com/sphinx-doc/sphinx/pull/8313\n";
902 }
903
904 sub check_needs()
905 {
906         # Check if Sphinx is already accessible from current environment
907         check_sphinx();
908
909         if ($system_release) {
910                 print "Detected OS: $system_release.\n";
911         } else {
912                 print "Unknown OS\n";
913         }
914         printf "Sphinx version: %s\n\n", $cur_version if ($cur_version);
915
916         # Check python command line, trying first python3
917         $python_cmd = findprog("python3");
918         $python_cmd = check_program("python", 0) if (!$python_cmd);
919
920         # Check the type of virtual env, depending on Python version
921         if ($python_cmd) {
922                 if ($virtualenv) {
923                         my $tmp = qx($python_cmd --version 2>&1);
924                         if ($tmp =~ m/(\d+\.)(\d+\.)/) {
925                                 if ($1 < 3) {
926                                         # Fail if it finds python2 (or worse)
927                                         die "Python 3 is required to build the kernel docs\n";
928                                 }
929                                 if ($1 == 3 && $2 < 3) {
930                                         # Need Python 3.3 or upper for venv
931                                         $need_virtualenv = 1;
932                                 }
933                         } else {
934                                 die "Warning: couldn't identify $python_cmd version!";
935                         }
936                 } else {
937                         add_package("python-sphinx", 0);
938                 }
939         }
940
941         my $venv_ver = recommend_sphinx_upgrade();
942
943         my $virtualenv_cmd;
944
945         if ($need_pip) {
946                 # Set virtualenv command line, if python < 3.3
947                 if ($need_virtualenv) {
948                         $virtualenv_cmd = findprog("virtualenv-3");
949                         $virtualenv_cmd = findprog("virtualenv-3.5") if (!$virtualenv_cmd);
950                         if (!$virtualenv_cmd) {
951                                 check_program("virtualenv", 0);
952                                 $virtualenv_cmd = "virtualenv";
953                         }
954                 } else {
955                         $virtualenv_cmd = "$python_cmd -m venv";
956                         check_python_module("ensurepip", 0);
957                 }
958         }
959
960         # Check for needed programs/tools
961         check_perl_module("Pod::Usage", 0);
962         check_program("make", 0);
963         check_program("gcc", 0);
964         check_program("dot", 1);
965         check_program("convert", 1);
966
967         # Extra PDF files - should use 2 for is_optional
968         check_program("xelatex", 2) if ($pdf);
969         check_program("rsvg-convert", 2) if ($pdf);
970         check_program("latexmk", 2) if ($pdf);
971
972         # Do distro-specific checks and output distro-install commands
973         check_distros();
974
975         if (!$python_cmd) {
976                 if ($need == 1) {
977                         die "Can't build as $need mandatory dependency is missing";
978                 } elsif ($need) {
979                         die "Can't build as $need mandatory dependencies are missing";
980                 }
981         }
982
983         # Check if sphinx-build is called sphinx-build-3
984         if ($need_symlink) {
985                 printf "\tsudo ln -sf %s /usr/bin/sphinx-build\n\n",
986                        which("sphinx-build-3");
987         }
988
989         recommend_sphinx_version($virtualenv_cmd);
990         printf "\n";
991
992         print "All optional dependencies are met.\n" if (!$optional);
993
994         if ($need == 1) {
995                 die "Can't build as $need mandatory dependency is missing";
996         } elsif ($need) {
997                 die "Can't build as $need mandatory dependencies are missing";
998         }
999
1000         print "Needed package dependencies are met.\n";
1001 }
1002
1003 #
1004 # Main
1005 #
1006
1007 while (@ARGV) {
1008         my $arg = shift(@ARGV);
1009
1010         if ($arg eq "--no-virtualenv") {
1011                 $virtualenv = 0;
1012         } elsif ($arg eq "--no-pdf"){
1013                 $pdf = 0;
1014         } elsif ($arg eq "--version-check"){
1015                 $version_check = 1;
1016         } else {
1017                 print "Usage:\n\t$0 <--no-virtualenv> <--no-pdf> <--version-check>\n\n";
1018                 print "Where:\n";
1019                 print "\t--no-virtualenv\t- Recommend installing Sphinx instead of using a virtualenv\n";
1020                 print "\t--version-check\t- if version is compatible, don't check for missing dependencies\n";
1021                 print "\t--no-pdf\t- don't check for dependencies required to build PDF docs\n\n";
1022                 exit -1;
1023         }
1024 }
1025
1026 #
1027 # Determine the system type. There's no standard unique way that would
1028 # work with all distros with a minimal package install. So, several
1029 # methods are used here.
1030 #
1031 # By default, it will use lsb_release function. If not available, it will
1032 # fail back to reading the known different places where the distro name
1033 # is stored
1034 #
1035
1036 $system_release = qx(lsb_release -d) if which("lsb_release");
1037 $system_release =~ s/Description:\s*// if ($system_release);
1038 $system_release = catcheck("/etc/system-release") if !$system_release;
1039 $system_release = catcheck("/etc/redhat-release") if !$system_release;
1040 $system_release = catcheck("/etc/lsb-release") if !$system_release;
1041 $system_release = catcheck("/etc/gentoo-release") if !$system_release;
1042
1043 # This seems more common than LSB these days
1044 if (!$system_release) {
1045         my %os_var;
1046         if (open IN, "cat /etc/os-release|") {
1047                 while (<IN>) {
1048                         if (m/^([\w\d\_]+)=\"?([^\"]*)\"?\n/) {
1049                                 $os_var{$1}=$2;
1050                         }
1051                 }
1052                 $system_release = $os_var{"NAME"};
1053                 if (defined($os_var{"VERSION_ID"})) {
1054                         $system_release .= " " . $os_var{"VERSION_ID"} if (defined($os_var{"VERSION_ID"}));
1055                 } else {
1056                         $system_release .= " " . $os_var{"VERSION"};
1057                 }
1058         }
1059 }
1060 $system_release = catcheck("/etc/issue") if !$system_release;
1061 $system_release =~ s/\s+$//;
1062
1063 check_needs;