Merge pull request #22864 from abbradar/dbus-etc

Redo DBus configuration

nixos/modules/services/system/dbus-session-local.conf.in

···
-<!DOCTYPE busconfig PUBLIC "-//freedesktop//DTD D-Bus Bus Configuration 1.0//EN"
- "http://www.freedesktop.org/standards/dbus/1.0/busconfig.dtd">
-<busconfig>
-  @extra@
-</busconfig>

nixos/modules/services/system/dbus-system-local.conf.in

···
-<!DOCTYPE busconfig PUBLIC "-//freedesktop//DTD D-Bus Bus Configuration 1.0//EN"
- "http://www.freedesktop.org/standards/dbus/1.0/busconfig.dtd">
-<busconfig>
-  <servicehelper>@servicehelper@</servicehelper>
-  @extra@
-</busconfig>

nixos/modules/services/system/dbus.nix

···
 
   homeDir = "/run/dbus";
 
-  systemExtraxml = concatStrings (flip concatMap cfg.packages (d: [
-    "<servicedir>${d}/share/dbus-1/system-services</servicedir>"
-    "<includedir>${d}/etc/dbus-1/system.d</includedir>"
-  ]));
-
-  sessionExtraxml = concatStrings (flip concatMap cfg.packages (d: [
-    "<servicedir>${d}/share/dbus-1/services</servicedir>"
-    "<includedir>${d}/etc/dbus-1/session.d</includedir>"
-  ]));
-
-  configDir = pkgs.runCommand "dbus-conf"
-    { preferLocalBuild = true;
-      allowSubstitutes = false;
-    }
-    ''
-      mkdir -p $out
-
-      sed '${./dbus-system-local.conf.in}' \
-        -e 's,@servicehelper@,${config.security.wrapperDir}/dbus-daemon-launch-helper,g' \
-        -e 's,@extra@,${systemExtraxml},' \
-        > "$out/system-local.conf"
-
-      sed '${./dbus-session-local.conf.in}' \
-        -e 's,@extra@,${sessionExtraxml},' \
-        > "$out/session-local.conf"
-    '';
+  configDir = pkgs.makeDBusConf {
+    suidHelper = "${config.security.wrapperDir}/dbus-daemon-launch-helper";
+    serviceDirectories = cfg.packages;
+  };
 
 in
 

pkgs/development/libraries/dbus/default.nix

···
       "--with-systemdsystemunitdir=$(out)/etc/systemd/system"
       "--with-systemduserunitdir=$(out)/etc/systemd/user"
       "--enable-user-session"
-      "--libexecdir=$(out)/libexec" # we don't need dbus-daemon-launch-helper
+      "--datadir=/etc"
+      "--libexecdir=$(out)/libexec"
     ] ++ lib.optional (!x11Support) "--without-x";
 
     # Enable X11 autolaunch support in libdbus. This doesn't actually depend on X11
···
 
     doCheck = true;
 
-    installFlags = [ "sysconfdir=$(out)/etc" ];
+    installFlags = [ "sysconfdir=$(out)/etc" "datadir=$(out)/share" ];
+
+    postInstall = ''
+      mkdir -p $doc/share/xml/dbus
+      cp doc/*.dtd $doc/share/xml/dbus
+    '';
 
     # it's executed from $lib by absolute path
     postFixup = ''

pkgs/development/libraries/dbus/make-dbus-conf.nix

···
+{ runCommand, libxslt, dbus, serviceDirectories ? [], suidHelper ? "/var/setuid-wrappers/dbus-daemon-launch-helper" }:
+
+/* DBus has two configuration parsers -- normal and "trivial", which is used
+ * for suid helper. Unfortunately the latter doesn't support <include>
+ * directive. That means that we can't just place our configuration to
+ * *-local.conf -- it needs to be in the main configuration file.
+ */
+runCommand "dbus-1"
+  {
+    buildInputs = [ libxslt ];
+    inherit serviceDirectories suidHelper;
+  }
+  ''
+    mkdir -p $out
+
+    xsltproc \
+      --stringparam serviceDirectories "$serviceDirectories" \
+      --stringparam suidHelper "$suidHelper" \
+      --path ${dbus.doc}/share/xml/dbus \
+      ${./make-system-conf.xsl} ${dbus}/share/dbus-1/system.conf \
+      > $out/system.conf
+    xsltproc \
+      --stringparam serviceDirectories "$serviceDirectories" \
+      --path ${dbus.doc}/share/xml/dbus \
+      ${./make-session-conf.xsl} ${dbus}/share/dbus-1/session.conf \
+      > $out/session.conf
+  ''

pkgs/development/libraries/dbus/make-session-conf.xsl

···
+<?xml version="1.0"?>
+
+<!--
+  This script copies the original system.conf from the dbus
+  distribution, but sets paths from $serviceDirectories parameter
+  and suid helper from $suidHelper parameter.
+-->
+
+<xsl:stylesheet version="1.0"
+                xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
+                xmlns:str="http://exslt.org/strings"
+                extension-element-prefixes="str"
+                >
+
+  <xsl:output method='xml' encoding="UTF-8" doctype-system="busconfig.dtd" />
+
+  <xsl:param name="serviceDirectories" />
+
+  <xsl:template match="/busconfig">
+    <busconfig>
+      <xsl:copy-of select="child::node()[name() != 'include' and name() != 'standard_session_servicedirs' and name() != 'servicedir' and name() != 'includedir']" />
+
+      <xsl:for-each select="str:tokenize($serviceDirectories)">
+        <servicedir><xsl:value-of select="." />/share/dbus-1/services</servicedir>
+        <includedir><xsl:value-of select="." />/etc/dbus-1/session.d</includedir>
+      </xsl:for-each>
+    </busconfig>
+  </xsl:template>
+
+</xsl:stylesheet>

pkgs/development/libraries/dbus/make-system-conf.xsl

···
+<?xml version="1.0"?>
+
+<!--
+  This script copies the original system.conf from the dbus
+  distribution, but sets paths from $serviceDirectories parameter
+  and suid helper from $suidHelper parameter.
+-->
+
+<xsl:stylesheet version="1.0"
+                xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
+                xmlns:str="http://exslt.org/strings"
+                extension-element-prefixes="str"
+                >
+
+  <xsl:output method='xml' encoding="UTF-8" doctype-system="busconfig.dtd" />
+
+  <xsl:param name="serviceDirectories" />
+  <xsl:param name="suidHelper" />
+
+  <xsl:template match="/busconfig">
+    <busconfig>
+      <xsl:copy-of select="child::node()[name() != 'include' and name() != 'standard_system_servicedirs' and name() != 'servicehelper' and name() != 'servicedir' and name() != 'includedir']" />
+
+      <!-- set suid helper -->
+      <servicehelper><xsl:value-of select="$suidHelper" /></servicehelper>
+
+      <xsl:for-each select="str:tokenize($serviceDirectories)">
+        <servicedir><xsl:value-of select="." />/share/dbus-1/system-services</servicedir>
+        <includedir><xsl:value-of select="." />/etc/dbus-1/system.d</includedir>
+      </xsl:for-each>
+    </busconfig>
+  </xsl:template>
+
+</xsl:stylesheet>

pkgs/top-level/all-packages.nix

···
   dbus_libs = dbus;
   dbus_daemon = dbus.daemon;
 
+  makeDBusConf = { suidHelper, serviceDirectories }:
+    callPackage ../development/libraries/dbus/make-dbus-conf.nix {
+      inherit suidHelper serviceDirectories;
+    };
+
   dee = callPackage ../development/libraries/dee { };
 
   dhex = callPackage ../applications/editors/dhex { };