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;