meson: rework processing of unit files

Ideally, we would chain the m4 processing, .in substitutions, and file
installation so that the commands don't have to be repeated. Unfortunately
this does not seem currently possible, because custom_target() output cannot
be fed into install_data(), so it's necessary to use the 'install',
'install_dir' arguments to control installation. Nevertheless, rework the
rules to repeat less stuff and unify handling of conditions between the
different file types.

diff --git a/units/meson.build b/units/meson.build
index 62f1e33..44bfda4 100644 (file)
--- a/units/meson.build
+++ b/units/meson.build
@@ -105,21 +105,7 @@ units = [
   ['user.slice',                          ''],
   ['var-lib-machines.mount',              '',
    'local-fs.target.wants/'],
-  ]
-
-foreach tuple : units
-  file = tuple[0]
-  if tuple[1] == '' or conf.get(tuple[1], 0) == 1
-    install_data(file,
-                 install_dir : systemunitdir)
-
-    if tuple.length() > 2
-      foreach target : tuple[2].split()
-        meson.add_install_script('meson-add-wants.sh', systemunitdir, target, file)
-      endforeach
-    endif
-  endif
-endforeach
+]
 
 in_units = [
   ['debug-shell.service',                  ''],
@@ -217,10 +203,44 @@ in_units = [
    'multi-user.target.wants/'],
   ['systemd-vconsole-setup.service',       'ENABLE_VCONSOLE'],
   ['systemd-volatile-root.service',        ''],
-  ]
+]
+
+m4_units = [
+  ['getty@.service',                     '',
+   'autovt@.service ' +
+   pkgsysconfdir + '/system/getty.target.wants/getty@tty1.service'],
+  ['serial-getty@.service',              ''],
+  ['tmp.mount',                          '',
+   'local-fs.target.wants/'],
+]
+
+m4_in_units = [
+  ['console-getty.service',              ''],
+  ['container-getty@.service',           ''],
+  ['systemd-networkd.service',           'ENABLE_NETWORKD',
+   'dbus-org.freedesktop.network1.service ' +
+   pkgsysconfdir + '/system/multi-user.target.wants/ '],
+  ['systemd-resolved.service',           'ENABLE_RESOLVED',
+   'dbus-org.freedesktop.resolve1.service ' +
+   pkgsysconfdir + '/system/multi-user.target.wants/'],
+  ['user@.service',                      ''],
+]
+
+foreach tuple : m4_in_units
+  file = tuple[0]
+
+  gen = configure_file(
+      input : file + '.m4.in',
+      output : file + '.m4',
+      configuration : substs)
+
+  m4_units += [[file, tuple.get(1, ''), tuple.get(2, ''), gen]]
+endforeach
 
 foreach tuple : in_units
   file = tuple[0]
+
+  # we do this here because install_data does not accept custom_target output
   conds = tuple[1].split(' ')
   install = ((conds.get(0, '') == '' or conf.get(conds[0], 0) == 1) and
              (conds.get(1, '') == '' or conf.get(conds[1], 0) == 1))
@@ -235,7 +255,7 @@ foreach tuple : in_units
     output : file,
     command : [sed, '/^## /d', '@INPUT@'],
     capture : true,
-    install : install,
+    install : true,
     install_dir : systemunitdir)
 
   if install and tuple.length() > 2
@@ -245,22 +265,18 @@ foreach tuple : in_units
   endif
 endforeach
 
-m4_units = [
-  ['getty@.service',                     '',
-   'autovt@.service ' +
-   pkgsysconfdir + '/system/getty.target.wants/getty@tty1.service'],
-  ['serial-getty@.service',              ''],
-  ['tmp.mount',                          '',
-   'local-fs.target.wants/'],
-  ]
-
 foreach tuple : m4_units
   file = tuple[0]
-  install = tuple[1] == '' or conf.get(tuple[1], 0) == 1
+  input = tuple.get(3, file + '.m4')
+
+  # we do this here because install_data does not accept custom_target output
+  conds = tuple[1].split(' ')
+  install = ((conds.get(0, '') == '' or conf.get(conds[0], 0) == 1) and
+             (conds.get(1, '') == '' or conf.get(conds[1], 0) == 1))
 
   custom_target(
     file,
-    input : file + '.m4',
+    input : input,
     output: file,
     command : [m4, '-P'] + m4_defines + ['@INPUT@'],
     capture : true,
@@ -274,43 +290,28 @@ foreach tuple : m4_units
   endif
 endforeach
 
-m4_in_units = [
-  ['console-getty.service',              ''],
-  ['container-getty@.service',           ''],
-  ['systemd-networkd.service',           'ENABLE_NETWORKD',
-   'dbus-org.freedesktop.network1.service ' +
-   pkgsysconfdir + '/system/multi-user.target.wants/ '],
-  ['systemd-resolved.service',           'ENABLE_RESOLVED',
-   'dbus-org.freedesktop.resolve1.service ' +
-   pkgsysconfdir + '/system/multi-user.target.wants/'],
-  ['user@.service',                      ''],
-  ]
-
-foreach tuple : m4_in_units
+foreach tuple : units
   file = tuple[0]
-  install = tuple[1] == '' or conf.get(tuple[1], 0) == 1
+  input = tuple.get(3, file)
 
-  gen = configure_file(
-      input : file + '.m4.in',
-      output : file + '.m4',
-      configuration : substs)
+  conds = tuple[1].split(' ')
+  install = ((conds.get(0, '') == '' or conf.get(conds[0], 0) == 1) and
+             (conds.get(1, '') == '' or conf.get(conds[1], 0) == 1))
 
-  custom_target(
-    file,
-    input : gen,
-    output: file,
-    command : [m4, '-P'] + m4_defines + ['@INPUT@'],
-    capture : true,
-    install : install,
-    install_dir : systemunitdir)
+  if install
+    install_data(input,
+                 install_dir : systemunitdir)
 
-  if tuple.length() > 2 and install
-    foreach target : tuple[2].split()
-      meson.add_install_script('meson-add-wants.sh', systemunitdir, target, file)
-    endforeach
+    if tuple.length() > 2
+      foreach target : tuple[2].split()
+        meson.add_install_script('meson-add-wants.sh', systemunitdir, target, file)
+      endforeach
+    endif
   endif
 endforeach
 
+############################################################
+
 meson.add_install_script(meson_make_symlink,
                          pkgsysconfdir + '/user',
                          sysconfdir + '/xdg/systemd/user')