NEWS

@@ -495,6 +495,17 @@ CHANGES WITH 247 in spe:
           such as replay debuggers where non-deterministic behaviour is not
           desirable.
 
+        * When building systemd the Meson option
+          -Dcompat-mutable-uid-boundaries may now be specified. If enabled,
+          systemd reads the system UID boundaries from /etc/login.defs, instead
+          of using the built-in values selected during build-time. This is an
+          option to improve compatibility for upgrades from old systems. It's
+          strongly recommended not to make use of this functionality on new
+          systems (or even enable it during build), as it makes something
+          runtime-configurable that is mostly an implementation detail of the
+          OS, and permits avoidable differences in deployments that create all
+          kinds of problems in the long run.
+
         * The autopaging logic in systemd's various tools (such as systemctl)
           has been updated to turn on "secure" mode in "less"
           (i.e. $LESSECURE=1) if execution in a "sudo" environment is
@@ -502,44 +513,6 @@ CHANGES WITH 247 in spe:
           via the pipe logic. This behaviour may be overridden via the new
           $SYSTEMD_PAGERSECURE environment variable.
 
-        * Units which have resource limits (.service, .mount, .swap, .slice,
-          .socket, and .slice) gained new configuration settings
-          ManagedOOMSwap=, ManagedOOMMemoryPressure=, and
-          ManagedOOMMemoryPressureLimitPercent= that speicify resource pressure
-          limits and optional action taken by systemd-oomd.
-
-        * A new service systemd-oomd has been added. It monitors resource
-          contention for selected parts of the unit hierarchy using the PSI
-          information reported by the kernel, and kills processes when memory
-          or swap pressure is above configured limits. This service is only
-          enabled in developer mode (see below) and should be considered a
-          preview in this release. Behaviour details and option names are
-          subject to change without the usual backwards-compatibility promises.
-
-        * A new helper oomctl has been added to introspect systemd-oomd state.
-          If also is only available in developer mode and should be considered
-          a preview without the usual backwards-compatibility promises.
-
-        * New meson option -Dcompat-mutable-uid-boundaries= has been added. If
-          enabled, systemd reads the system UID boundaries from /etc/login.defs
-          at runtime, instead of using the built-in values selected during
-          build. This is an option to improve compatibility for upgrades from
-          old systems. It's strongly recommended not to make use of this
-          functionality on new systems (or even enable it during build), as it
-          makes something runtime-configurable that is mostly an implementation
-          detail of the OS, and permits avoidable differences in deployments
-          that create all kinds of problems in the long run.
-
-        * New meson option '-Dmode=developer|release' has been added. When
-          'developer', additional checks and features are enabled that are
-          relevant during upstream development, e.g. verification that
-          semi-automatically-generated documentation has been properly updated
-          following API changes. Those checks are considered hints for
-          developers and are not actionable in downstream builds. In addition,
-          extra features that are not ready for general consumption may be
-          enabled in developer mode. It is thus recommended to set
-          '-Dmode=release' in end-user and distro builds.
-
 CHANGES WITH 246:
 
         * The service manager gained basic support for cgroup v2 freezer. Units

man/org.freedesktop.oom1.xml

@@ -1,74 +0,0 @@
-<?xml version='1.0'?>
-<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
-  "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd" >
-<!-- SPDX-License-Identifier: LGPL-2.1+ -->
-
-<refentry id="org.freedesktop.oom1" conditional='ENABLE_OOMD'
-    xmlns:xi="http://www.w3.org/2001/XInclude">
-  <refentryinfo>
-    <title>org.freedesktop.oom1</title>
-    <productname>systemd</productname>
-  </refentryinfo>
-
-  <refmeta>
-    <refentrytitle>org.freedesktop.oom1</refentrytitle>
-    <manvolnum>5</manvolnum>
-  </refmeta>
-
-  <refnamediv>
-    <refname>org.freedesktop.oom1</refname>
-    <refpurpose>The D-Bus interface of systemd-oomd</refpurpose>
-  </refnamediv>
-
-  <refsect1>
-    <title>Introduction</title>
-
-    <para>
-    <citerefentry><refentrytitle>systemd-oomd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
-    is a system service which implements a userspace out-of-memory (OOM) killer. This page describes the
-    D-Bus interface.</para>
-  </refsect1>
-
-  <refsect1>
-    <title>The Manager Object</title>
-
-    <para>The service exposes the following interfaces on the Manager object on the bus:</para>
-
-    <programlisting executable="systemd-oomd" node="/org/freedesktop/oom1" interface="org.freedesktop.oom1.Manager">
-node /org/freedesktop/oom1 {
-  interface org.freedesktop.oom1.Manager {
-    methods:
-      DumpByFileDescriptor(out h fd);
-  };
-  interface org.freedesktop.DBus.Peer { ... };
-  interface org.freedesktop.DBus.Introspectable { ... };
-  interface org.freedesktop.DBus.Properties { ... };
-};
-    </programlisting>
-
-    <!--method DumpByFileDescriptor is not documented!-->
-
-    <!--Autogenerated cross-references for systemd.directives, do not edit-->
-
-    <variablelist class="dbus-interface" generated="True" extra-ref="org.freedesktop.oom1.Manager"/>
-
-    <variablelist class="dbus-interface" generated="True" extra-ref="org.freedesktop.oom1.Manager"/>
-
-    <variablelist class="dbus-method" generated="True" extra-ref="DumpByFileDescriptor()"/>
-
-    <!--End of Autogenerated section-->
-
-    <refsect2>
-      <title>Methods</title>
-
-      <para>...</para>
-    </refsect2>
-  </refsect1>
-
-  <refsect1>
-    <title>Versioning</title>
-
-    <para>These D-Bus interfaces follow <ulink url="http://0pointer.de/blog/projects/versioning-dbus.html">
-    the usual interface versioning guidelines</ulink>.</para>
-  </refsect1>
-</refentry>

man/rules/meson.build

@@ -54,7 +54,6 @@ manpages = [
  ['org.freedesktop.locale1', '5', [], 'ENABLE_LOCALED'],
  ['org.freedesktop.login1', '5', [], 'ENABLE_LOGIND'],
  ['org.freedesktop.machine1', '5', [], 'ENABLE_MACHINED'],
- ['org.freedesktop.oom1', '5', [], 'ENABLE_OOMD'],
  ['org.freedesktop.resolve1', '5', [], 'ENABLE_RESOLVE'],
  ['org.freedesktop.systemd1', '5', [], ''],
  ['org.freedesktop.timedate1', '5', [], 'ENABLE_TIMEDATED'],

meson.build

@@ -1412,15 +1412,7 @@ conf.set10('ENABLE_HOMED', have)
 have = have and conf.get('HAVE_PAM') == 1
 conf.set10('ENABLE_PAM_HOME', have)
 
-have = get_option('oomd')
-if have == 'auto'
-        have = get_option('mode') == 'developer'
-else
-        have = have == 'true'
-        if have and get_option('mode') != 'developer'
-                error('oomd is not available in release mode (yet)')
-        endif
-endif
+have = get_option('oomd') and get_option('mode') == 'developer'
 conf.set10('ENABLE_OOMD', have)
 
 want_remote = get_option('remote')

meson_options.txt

@@ -97,7 +97,7 @@ option('coredump', type : 'boolean',
        description : 'install the coredump handler')
 option('pstore', type : 'boolean',
        description : 'install the pstore archival tool')
-option('oomd', type : 'combo', choices : ['auto', 'true', 'false'],
+option('oomd', type : 'boolean', value : 'false',
        description : 'install the userspace oom killer')
 option('logind', type : 'boolean',
        description : 'install the systemd-logind stack')

src/basic/meson.build

@@ -333,7 +333,6 @@ libbasic = static_library(
         dependencies : [versiondep,
                         threads,
                         libcap,
-                        libseccomp,
                         libselinux,
                         libm,
                         libdl],

src/oom/oomd-manager-bus.c

@@ -29,19 +29,8 @@ static int bus_method_dump_by_fd(sd_bus_message *message, void *userdata, sd_bus
         return sd_bus_reply_method_return(message, "h", fd);
 }
 
-static const sd_bus_vtable manager_vtable[] = {
+const sd_bus_vtable manager_vtable[] = {
         SD_BUS_VTABLE_START(0),
-        SD_BUS_METHOD_WITH_NAMES("DumpByFileDescriptor",
-                                 NULL,,
-                                 "h",
-                                 SD_BUS_PARAM(fd),
-                                 bus_method_dump_by_fd,
-                                 SD_BUS_VTABLE_UNPRIVILEGED),
+        SD_BUS_METHOD("DumpByFileDescriptor", NULL, "h", bus_method_dump_by_fd, SD_BUS_VTABLE_UNPRIVILEGED),
         SD_BUS_VTABLE_END
 };
-
-const BusObjectImplementation manager_object = {
-        "/org/freedesktop/oom1",
-        "org.freedesktop.oom1.Manager",
-        .vtables = BUS_VTABLES(manager_vtable),
-};

src/oom/oomd-manager-bus.h

@@ -1,8 +1,8 @@
 /* SPDX-License-Identifier: LGPL-2.1+ */
 #pragma once
 
-#include "bus-object.h"
+#include "sd-bus.h"
 
 typedef struct Manager Manager;
 
-extern const BusObjectImplementation manager_object;
+extern const sd_bus_vtable manager_vtable[];

src/oom/oomd-manager.c

@@ -455,9 +455,9 @@ static int manager_connect_bus(Manager *m) {
         if (r < 0)
                 return log_error_errno(r, "Failed to connect to bus: %m");
 
-        r = bus_add_implementation(m->bus, &manager_object, m);
+        r = sd_bus_add_object_vtable(m->bus, NULL, "/org/freedesktop/oom1", "org.freedesktop.oom1.Manager", manager_vtable, m);
         if (r < 0)
-                return r;
+                return log_error_errno(r, "Failed to add manager object vtable: %m");
 
         r = bus_log_control_api_register(m->bus);
         if (r < 0)

src/oom/oomd.c

@@ -2,15 +2,12 @@
 
 #include <getopt.h>
 
-#include "bus-log-control-api.h"
-#include "bus-object.h"
 #include "cgroup-util.h"
 #include "conf-parser.h"
 #include "daemon-util.h"
 #include "log.h"
 #include "main-func.h"
 #include "oomd-manager.h"
-#include "oomd-manager-bus.h"
 #include "parse-util.h"
 #include "pretty-print.c"
 #include "psi-util.h"
@@ -46,31 +43,25 @@ static int help(void) {
                 return log_oom();
 
         printf("%s [OPTIONS...]\n\n"
-               "Run the userspace out-of-memory (OOM) killer.\n\n"
-               "  -h --help                 Show this help\n"
-               "     --version              Show package version\n"
-               "     --dry-run              Only print destructive actions instead of doing them\n"
-               "     --bus-introspect=PATH  Write D-Bus XML introspection data\n"
-               "\nSee the %s for details.\n"
-               , program_invocation_short_name
-               , link
-        );
+                        "Run the userspace out-of-memory (OOM) killer.\n\n"
+                        "  -h --help     Show this help\n"
+                        "     --dry-run  Log write/destructive actions instead of doing them\n"
+                        "\nSee the %s for details.\n"
+                        , program_invocation_short_name
+                        , link
+              );
 
         return 0;
 }
 
 static int parse_argv(int argc, char *argv[]) {
         enum {
-                ARG_VERSION = 0x100,
                 ARG_DRY_RUN,
-                ARG_BUS_INTROSPECT,
         };
 
         static const struct option options[] = {
-                { "help",           no_argument,       NULL, 'h'                },
-                { "version",        no_argument,       NULL, ARG_VERSION        },
-                { "dry-run",        no_argument,       NULL, ARG_DRY_RUN        },
-                { "bus-introspect", required_argument, NULL, ARG_BUS_INTROSPECT },
+                { "help",    no_argument, NULL, 'h'         },
+                { "dry-run", no_argument, NULL, ARG_DRY_RUN },
                 {}
         };
 
@@ -83,34 +74,20 @@ static int parse_argv(int argc, char *argv[]) {
 
                 switch (c) {
 
-                case 'h':
-                        return help();
+                        case 'h':
+                                return help();
 
-                case ARG_VERSION:
-                        return version();
+                        case ARG_DRY_RUN:
+                                arg_dry_run = true;
+                                break;
 
-                case ARG_DRY_RUN:
-                        arg_dry_run = true;
-                        break;
+                        case '?':
+                                return -EINVAL;
 
-                case ARG_BUS_INTROSPECT:
-                        return bus_introspect_implementations(
-                                        stdout,
-                                        optarg,
-                                        BUS_IMPLEMENTATIONS(&manager_object,
-                                                            &log_control_object));
-
-                case '?':
-                        return -EINVAL;
-
-                default:
-                        assert_not_reached("Unknown option code.");
+                        default:
+                                assert_not_reached("Invalid option passed.");
                 }
 
-        if (optind < argc)
-                return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
-                                       "This program takes no arguments.");
-
         return 1;
 }
 

src/test/meson.build

@@ -333,7 +333,7 @@ tests += [
 
         [['src/test/test-parse-util.c'],
          [],
-         [libseccomp]],
+         []],
 
         [['src/test/test-sysctl-util.c'],
          [],