tools/make-directive-index.py

   1 #!/usr/bin/env python3
   2 # SPDX-License-Identifier: LGPL-2.1+
   3
   4 import sys
   5 import collections
   6 import re
   7 from xml_helper import xml_parse, xml_print, tree
   8 from copy import deepcopy
   9
  10 TEMPLATE = '''\
  11 <refentry id="systemd.directives" conditional="HAVE_PYTHON">
  12
  13         <refentryinfo>
  14                 <title>systemd.directives</title>
  15                 <productname>systemd</productname>
  16         </refentryinfo>
  17
  18         <refmeta>
  19                 <refentrytitle>systemd.directives</refentrytitle>
  20                 <manvolnum>7</manvolnum>
  21         </refmeta>
  22
  23         <refnamediv>
  24                 <refname>systemd.directives</refname>
  25                 <refpurpose>Index of configuration directives</refpurpose>
  26         </refnamediv>
  27
  28         <refsect1>
  29                 <title>Unit directives</title>
  30
  31                 <para>Directives for configuring units, used in unit
  32                 files.</para>
  33
  34                 <variablelist id='unit-directives' />
  35         </refsect1>
  36
  37         <refsect1>
  38                 <title>Options on the kernel command line</title>
  39
  40                 <para>Kernel boot options for configuring the behaviour of the
  41                 systemd process.</para>
  42
  43                 <variablelist id='kernel-commandline-options' />
  44         </refsect1>
  45
  46         <refsect1>
  47                 <title>Environment variables</title>
  48
  49                 <para>Environment variables understood by the systemd manager
  50                 and other programs and environment variable-compatible settings.</para>
  51
  52                 <variablelist id='environment-variables' />
  53         </refsect1>
  54
  55         <refsect1>
  56                 <title>EFI variables</title>
  57
  58                 <para>EFI variables understood by
  59                 <citerefentry><refentrytitle>systemd-boot</refentrytitle><manvolnum>7</manvolnum></citerefentry>
  60                 and other programs.</para>
  61
  62                 <variablelist id='efi-variables' />
  63         </refsect1>
  64
  65         <refsect1>
  66                 <title>UDEV directives</title>
  67
  68                 <para>Directives for configuring systemd units through the
  69                 udev database.</para>
  70
  71                 <variablelist id='udev-directives' />
  72         </refsect1>
  73
  74         <refsect1>
  75                 <title>Network directives</title>
  76
  77                 <para>Directives for configuring network links through the
  78                 net-setup-link udev builtin and networks through
  79                 systemd-networkd.</para>
  80
  81                 <variablelist id='network-directives' />
  82         </refsect1>
  83
  84         <refsect1>
  85                 <title>Journal fields</title>
  86
  87                 <para>Fields in the journal events with a well known meaning.</para>
  88
  89                 <variablelist id='journal-directives' />
  90         </refsect1>
  91
  92         <refsect1>
  93                 <title>PAM configuration directives</title>
  94
  95                 <para>Directives for configuring PAM behaviour.</para>
  96
  97                 <variablelist id='pam-directives' />
  98         </refsect1>
  99
 100         <refsect1>
 101                 <title><filename>/etc/crypttab</filename> and
 102                 <filename>/etc/fstab</filename> options</title>
 103
 104                 <para>Options which influence mounted filesystems and
 105                 encrypted volumes.</para>
 106
 107                 <variablelist id='fstab-options' />
 108         </refsect1>
 109
 110         <refsect1>
 111                 <title><citerefentry><refentrytitle>systemd.nspawn</refentrytitle><manvolnum>5</manvolnum></citerefentry>
 112                 directives</title>
 113
 114                 <para>Directives for configuring systemd-nspawn containers.</para>
 115
 116                 <variablelist id='nspawn-directives' />
 117         </refsect1>
 118
 119         <refsect1>
 120                 <title>Program configuration options</title>
 121
 122                 <para>Directives for configuring the behaviour of the
 123                 systemd process and other tools through configuration files.</para>
 124
 125                 <variablelist id='config-directives' />
 126         </refsect1>
 127
 128         <refsect1>
 129                 <title>Command line options</title>
 130
 131                 <para>Command-line options accepted by programs in the
 132                 systemd suite.</para>
 133
 134                 <variablelist id='options' />
 135         </refsect1>
 136
 137         <refsect1>
 138                 <title>Constants</title>
 139
 140                 <para>Various constant used and/or defined by systemd.</para>
 141
 142                 <variablelist id='constants' />
 143         </refsect1>
 144
 145         <refsect1>
 146                 <title>Miscellaneous options and directives</title>
 147
 148                 <para>Other configuration elements which don't fit in
 149                 any of the above groups.</para>
 150
 151                 <variablelist id='miscellaneous' />
 152         </refsect1>
 153
 154         <refsect1>
 155                 <title>Files and directories</title>
 156
 157                 <para>Paths and file names referred to in the
 158                 documentation.</para>
 159
 160                 <variablelist id='filenames' />
 161         </refsect1>
 162
 163         <refsect1>
 164                 <title>Colophon</title>
 165                 <para id='colophon' />
 166         </refsect1>
 167 </refentry>
 168 '''
 169
 170 COLOPHON = '''\
 171 This index contains {count} entries in {sections} sections,
 172 referring to {pages} individual manual pages.
 173 '''
 174
 175 def _extract_directives(directive_groups, formatting, page):
 176     t = xml_parse(page)
 177     section = t.find('./refmeta/manvolnum').text
 178     pagename = t.find('./refmeta/refentrytitle').text
 179
 180     storopt = directive_groups['options']
 181     for variablelist in t.iterfind('.//variablelist'):
 182         klass = variablelist.attrib.get('class')
 183         storvar = directive_groups[klass or 'miscellaneous']
 184         # <option>s go in OPTIONS, unless class is specified
 185         for xpath, stor in (('./varlistentry/term/varname', storvar),
 186                             ('./varlistentry/term/option',
 187                              storvar if klass else storopt)):
 188             for name in variablelist.iterfind(xpath):
 189                 text = re.sub(r'([= ]).*', r'\1', name.text).rstrip()
 190                 stor[text].append((pagename, section))
 191                 if text not in formatting:
 192                     # use element as formatted display
 193                     if name.text[-1] in '= ':
 194                         name.clear()
 195                     else:
 196                         name.tail = ''
 197                     name.text = text
 198                     formatting[text] = name
 199
 200     storfile = directive_groups['filenames']
 201     for xpath, absolute_only in (('.//refsynopsisdiv//filename', False),
 202                                  ('.//refsynopsisdiv//command', False),
 203                                  ('.//filename', True)):
 204         for name in t.iterfind(xpath):
 205             if absolute_only and not (name.text and name.text.startswith('/')):
 206                 continue
 207             if name.attrib.get('noindex'):
 208                 continue
 209             name.tail = ''
 210             if name.text:
 211                 if name.text.endswith('*'):
 212                     name.text = name.text[:-1]
 213                 if not name.text.startswith('.'):
 214                     text = name.text.partition(' ')[0]
 215                     if text != name.text:
 216                         name.clear()
 217                         name.text = text
 218                     if text.endswith('/'):
 219                         text = text[:-1]
 220                     storfile[text].append((pagename, section))
 221                     if text not in formatting:
 222                         # use element as formatted display
 223                         formatting[text] = name
 224             else:
 225                 text = ' '.join(name.itertext())
 226                 storfile[text].append((pagename, section))
 227                 formatting[text] = name
 228
 229     storfile = directive_groups['constants']
 230     for name in t.iterfind('.//constant'):
 231         if name.attrib.get('noindex'):
 232             continue
 233         name.tail = ''
 234         if name.text.startswith('('): # a cast, strip it
 235             name.text = name.text.partition(' ')[2]
 236         storfile[name.text].append((pagename, section))
 237         formatting[name.text] = name
 238
 239 def _make_section(template, name, directives, formatting):
 240     varlist = template.find(".//*[@id='{}']".format(name))
 241     for varname, manpages in sorted(directives.items()):
 242         entry = tree.SubElement(varlist, 'varlistentry')
 243         term = tree.SubElement(entry, 'term')
 244         display = deepcopy(formatting[varname])
 245         term.append(display)
 246
 247         para = tree.SubElement(tree.SubElement(entry, 'listitem'), 'para')
 248
 249         b = None
 250         for manpage, manvolume in sorted(set(manpages)):
 251             if b is not None:
 252                 b.tail = ', '
 253             b = tree.SubElement(para, 'citerefentry')
 254             c = tree.SubElement(b, 'refentrytitle')
 255             c.text = manpage
 256             c.attrib['target'] = varname
 257             d = tree.SubElement(b, 'manvolnum')
 258             d.text = manvolume
 259         entry.tail = '\n\n'
 260
 261 def _make_colophon(template, groups):
 262     count = 0
 263     pages = set()
 264     for group in groups:
 265         count += len(group)
 266         for pagelist in group.values():
 267             pages |= set(pagelist)
 268
 269     para = template.find(".//para[@id='colophon']")
 270     para.text = COLOPHON.format(count=count,
 271                                 sections=len(groups),
 272                                 pages=len(pages))
 273
 274 def _make_page(template, directive_groups, formatting):
 275     """Create an XML tree from directive_groups.
 276
 277     directive_groups = {
 278        'class': {'variable': [('manpage', 'manvolume'), ...],
 279                  'variable2': ...},
 280        ...
 281     }
 282     """
 283     for name, directives in directive_groups.items():
 284         _make_section(template, name, directives, formatting)
 285
 286     _make_colophon(template, directive_groups.values())
 287
 288     return template
 289
 290 def make_page(*xml_files):
 291     "Extract directives from xml_files and return XML index tree."
 292     template = tree.fromstring(TEMPLATE)
 293     names = [vl.get('id') for vl in template.iterfind('.//variablelist')]
 294     directive_groups = {name:collections.defaultdict(list)
 295                         for name in names}
 296     formatting = {}
 297     for page in xml_files:
 298         try:
 299             _extract_directives(directive_groups, formatting, page)
 300         except Exception:
 301             raise ValueError("failed to process " + page)
 302
 303     return _make_page(template, directive_groups, formatting)
 304
 305 if __name__ == '__main__':
 306     with open(sys.argv[1], 'wb') as f:
 307         f.write(xml_print(make_page(*sys.argv[2:])))