build: install pre-disted manpages if available

When building from a release tarball of NetworkManager,
`meson.add_dist_script()` has copied various prebuilt manpages into the
tarball and building them again is not really necessary. We can just
install those directly.

This means that *all* manpages could be installed even without
introspection, even though some of them can only be *built* when
introspection is enabled.

It also means that manpages can be installed even when xsltproc is not
available at build time.

man/meson.build

@@ -1,5 +1,52 @@
 # SPDX-License-Identifier: LGPL-2.1-or-later
 
+mans = [
+  ['NetworkManager', '8'],
+  ['NetworkManager-dispatcher', '8'],
+  ['NetworkManager-wait-online.service', '8'],
+  ['NetworkManager.conf', '5'],
+  ['nm-online', '1'],
+  ['nmcli-examples', '7'],
+  ['nmcli', '1'],
+  ['nmtui', '1'],
+  ['nm-initrd-generator', '8'],
+]
+
+if enable_ovs
+  mans += [['nm-openvswitch', '7']]
+endif
+
+if enable_nm_cloud_setup
+  mans += [['nm-cloud-setup', '8']]
+endif
+
+introspection_mans = [
+  ['nm-settings-keyfile', '5'],
+  ['nm-settings-dbus',    '5'],
+  ['nm-settings-nmcli',   '5'],
+]
+
+if enable_ifcfg_rh
+  introspection_mans += [['nm-settings-ifcfg-rh', '5']]
+endif
+
+built_mans = []
+foreach man: mans + introspection_mans
+  name = man[0] + '.' + man[1]
+  if not fs.exists(name)
+    built_mans = []
+    break
+  endif
+
+  built_mans += name
+endforeach
+
+if built_mans.length() > 0
+  install_man(built_mans)
+  subdir_done()
+endif
+
+
 common_ent_file = configure_file(
   input: 'common.ent.in',
   output: '@BASENAME@',
@@ -24,26 +71,6 @@ docbook_xls = 'http://docbook.sourceforge.net/release/xsl/current/manpages/docbo
 
 mans_xmls = []
 
-mans = [
-  ['NetworkManager', '8'],
-  ['NetworkManager-dispatcher', '8'],
-  ['NetworkManager-wait-online.service', '8'],
-  ['NetworkManager.conf', '5'],
-  ['nm-online', '1'],
-  ['nmcli-examples', '7'],
-  ['nmcli', '1'],
-  ['nmtui', '1'],
-  ['nm-initrd-generator', '8'],
-]
-
-if enable_ovs
-  mans += [['nm-openvswitch', '7']]
-endif
-
-if enable_nm_cloud_setup
-  mans += [['nm-cloud-setup', '8']]
-endif
-
 foreach man: mans
   input = man[0] + '.xml'
   content_files += join_paths(meson.current_source_dir(), input)

meson.build

@@ -12,7 +12,7 @@ project(
     'c_std=gnu11',
     'warning_level=2' # value "2" will add "-Wall" and "-Wextra" to the compiler flags
   ],
-  meson_version: '>= 0.51.0',
+  meson_version: '>= 0.53.0',
 )
 
 nm_name = meson.project_name()
@@ -77,6 +77,7 @@ libnm_version = '@0@.@1@.@2@'.format(current - age, age, revision)
 
 libnm_pkgincludedir = join_paths(nm_includedir, libnm_name)
 
+fs = import('fs')
 gnome = import('gnome')
 i18n = import('i18n')
 pkg = import('pkgconfig')