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systemctl: add service-log-{level,target} verbs
Heavily inspired by #15622. This adds: systemctl service-log-level systemd-resolved systemctl service-log-level systemd-resolved info systemctl service-log-target systemd-resolved systemctl service-log-target systemd-resolved console We already have systemctl verbs log-level, log-target, and service-watchdogs. Those two new verbs tie nicely into this scheme.
This commit is contained in:
Zbigniew Jędrzejewski-Szmek
parent
172338d51b
commit
6824c132e9
@ -24,8 +24,8 @@
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<title>Introduction</title>
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<para><interfacename>org.freedesktop.LogControl1</interfacename> is a generic interface that is intended
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to be used by any daemon which should allow setting the log level and target over D-Bus. It is implemented
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by various daemons that are part of the
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to be used by any daemon which allows the log level and target to be set over D-Bus. It is implemented by
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various daemons that are part of the
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry> suite.</para>
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<para>It is assumed that those settings are global for the whole program, so a fixed object path is
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@ -95,12 +95,35 @@ node /org/freedesktop/LogControl1 {
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It is a short string that identifies the program that is the source of log messages that is passed to
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the <citerefentry project="man-pages"><refentrytitle>syslog</refentrytitle><manvolnum>3</manvolnum></citerefentry> call.
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</para>
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<para>Note: <command>journalctl</command> option <option>-p</option>/<option>--priority=</option> may
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be used to filter log messages by log level, option <option>-t</option>/<option>--identifier=</option>
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may be used to by the syslog identifier, and filters like <literal>_TRANSPORT=syslog</literal>,
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<literal>_TRANSPORT=journal</literal>, and <literal>_TRANSPORT=kernel</literal> may be used to filter
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messages by the mechanism through which they reached <command>systemd-journald</command>.</para>
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</refsect2>
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</refsect1>
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<refsect1>
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<title>Tools</title>
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<para><command>journalctl</command> option <option>-p</option>/<option>--priority=</option> may be used
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to filter log messages by log level, option <option>-t</option>/<option>--identifier=</option> may be
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used to by the syslog identifier, and filters like <literal>_TRANSPORT=syslog</literal>,
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<literal>_TRANSPORT=journal</literal>, and <literal>_TRANSPORT=kernel</literal> may be used to filter
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messages by the mechanism through which they reached <command>systemd-journald</command>.</para>
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<para><command>systemctl log-level</command> and <command>systemctl log-target</command> verbs may be
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used to query and set the <varname>LogLevel</varname> and <varname>LogTarget</varname> properties of the
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service manager. <command>systemctl service-log-level</command> and <command>systemctl
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service-log-target</command> may similarly be used for individual services. (Services must have the
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<varname>BusName=</varname> property set and must implement the interface described here. See
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<citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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for details about <varname>BusName=</varname>.)</para>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para>
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>journalctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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<citerefentry project='man-pages'><refentrytitle>syslog</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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@ -550,6 +550,62 @@ Jan 12 10:46:45 example.com bluetoothd[8900]: gatt-time-server: Input/output err
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><command>service-log-level</command> <replaceable>SERVICE</replaceable> [<replaceable>LEVEL</replaceable>]</term>
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<listitem><para>If the <replaceable>LEVEL</replaceable> argument is not given, print the current
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log level as reported by service <replaceable>SERVICE</replaceable>.</para>
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<para>If the optional argument <replaceable>LEVEL</replaceable> is provided, then change the
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current log level of the service to <replaceable>LEVEL</replaceable>. The log level should be a
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typical syslog log level, i.e. a value in the range 0…7 or one of the strings
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<constant>emerg</constant>, <constant>alert</constant>, <constant>crit</constant>,
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<constant>err</constant>, <constant>warning</constant>, <constant>notice</constant>,
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<constant>info</constant>, <constant>debug</constant>; see <citerefentry
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project='man-pages'><refentrytitle>syslog</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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for details.</para>
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<para>The service must have the appropriate
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<varname>BusName=<replaceable>destination</replaceable></varname> property and also implement the
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generic
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<citerefentry><refentrytitle>org.freedesktop.LogControl1</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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interface. (<filename>systemctl</filename> will use the generic D-Bus protocol to access the
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<interfacename>org.freedesktop.LogControl1.LogLevel</interfacename> interface for the D-Bus name
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<replaceable>destination</replaceable>.)</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><command>service-log-target</command> <replaceable>SERVICE</replaceable> [<replaceable>TARGET</replaceable>]</term>
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<listitem><para>If the <replaceable>TARGET</replaceable> argument is not given, print the current
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log target as reported by service <replaceable>SERVICE</replaceable>.</para>
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<para>If the optional argument <replaceable>TARGET</replaceable> is provided, then change the
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current log target of the service to <replaceable>TARGET</replaceable>. The log target should be
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one of the strings <constant>console</constant> (for log output to the service's standard error
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stream), <constant>kmsg</constant> (for log output to the kernel log buffer),
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<constant>journal</constant> (for log output to
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<citerefentry><refentrytitle>systemd-journald.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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using the native journal protocol), <constant>syslog</constant> (for log output to the classic
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syslog socket <filename>/dev/log</filename>), <constant>null</constant> (for no log output
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whatsoever) or <constant>auto</constant> (for an automatically determined choice, typically
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equivalent to <constant>console</constant> if the service is invoked interactively, and
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<constant>journal</constant> or <constant>syslog</constant> otherwise).</para>
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<para>For most services, only a small subset of log targets make sense. In particular, most
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"normal" services should only implement <constant>console</constant>, <constant>journal</constant>,
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and <constant>null</constant>. Anything else is only appropriate for low-level services that
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are active in very early boot before proper logging is established.</para>
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<para>The service must have the appropriate
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<varname>BusName=<replaceable>destination</replaceable></varname> property and also implement the
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generic
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<citerefentry><refentrytitle>org.freedesktop.LogControl1</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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interface. (<filename>systemctl</filename> will use the generic D-Bus protocol to access the
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<interfacename>org.freedesktop.LogControl1.LogLevel</interfacename> interface for the D-Bus name
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<replaceable>destination</replaceable>.)</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><command>reset-failed [<replaceable>PATTERN</replaceable>…]</command></term>
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@ -292,10 +292,11 @@
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<varlistentry>
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<term><varname>BusName=</varname></term>
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<listitem><para>Takes a D-Bus bus name that this service is
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reachable as. This option is mandatory for services where
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<varname>Type=</varname> is set to
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<option>dbus</option>.</para>
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<listitem><para>Takes a D-Bus destination name that this service shall use. This option is mandatory
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for services where <varname>Type=</varname> is set to <option>dbus</option>. It is recommended to
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always set this property if known to make it easy to map the service name to the D-Bus destination.
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In particular, <command>systemctl service-log-level/service-log-target</command> verbs make use of
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this.</para>
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</listitem>
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</varlistentry>
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@ -6327,6 +6327,98 @@ static int log_level(int argc, char *argv[], void *userdata) {
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return 0;
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}
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static int service_name_to_dbus(sd_bus *bus, const char *name, char **ret_dbus_name) {
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_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
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_cleanup_free_ char *bus_name = NULL;
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int r;
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/* First, look for the BusName= property */
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_cleanup_free_ char *dbus_path = unit_dbus_path_from_name(name);
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if (!dbus_path)
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return log_oom();
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r = sd_bus_get_property_string(
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bus,
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"org.freedesktop.systemd1",
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dbus_path,
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"org.freedesktop.systemd1.Service",
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"BusName",
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&error,
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&bus_name);
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if (r < 0)
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return log_error_errno(r, "Failed to obtain BusName= property of %s: %s",
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name, bus_error_message(&error, r));
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if (isempty(bus_name))
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return log_error_errno(SYNTHETIC_ERRNO(ENOLINK),
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"Unit %s doesn't declare BusName=.", name);
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*ret_dbus_name = TAKE_PTR(bus_name);
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return 0;
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}
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static int service_log_setting(int argc, char *argv[], void *userdata) {
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sd_bus *bus;
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_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
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_cleanup_free_ char *unit = NULL, *dbus_name = NULL;
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int r;
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assert(STR_IN_SET(argv[0], "service-log-level", "service-log-target"));
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bool level = streq(argv[0], "service-log-level");
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r = acquire_bus(BUS_FULL, &bus);
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if (r < 0)
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return r;
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r = unit_name_mangle_with_suffix(argv[1], argv[0],
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arg_quiet ? 0 : UNIT_NAME_MANGLE_WARN,
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".service", &unit);
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if (r < 0)
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return log_error_errno(r, "Failed to mangle unit name: %m");
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r = service_name_to_dbus(bus, unit, &dbus_name);
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if (r < 0)
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return r;
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if (argc == 2) {
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_cleanup_free_ char *value = NULL;
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r = sd_bus_get_property_string(
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bus,
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dbus_name,
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"/org/freedesktop/LogControl1",
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"org.freedesktop.LogControl1",
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level ? "LogLevel" : "LogTarget",
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&error,
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&value);
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if (r < 0)
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return log_error_errno(r, "Failed to get log %s of service %s: %s",
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level ? "level" : "target",
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dbus_name, bus_error_message(&error, r));
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puts(value);
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} else {
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assert(argc == 3);
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r = sd_bus_set_property(
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bus,
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dbus_name,
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"/org/freedesktop/LogControl1",
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"org.freedesktop.LogControl1",
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level ? "LogLevel" : "LogTarget",
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&error,
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"s",
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argv[2]);
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if (r < 0)
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return log_error_errno(r, "Failed to set log %s of service %s to %s: %s",
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level ? "level" : "target",
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dbus_name, argv[2], bus_error_message(&error, r));
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}
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return 0;
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}
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static int log_target(int argc, char *argv[], void *userdata) {
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sd_bus *bus;
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_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
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@ -7734,6 +7826,8 @@ static int systemctl_help(void) {
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" freeze PATTERN... Freeze execution of unit processes\n"
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" thaw PATTERN... Resume execution of a frozen unit\n"
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" set-property UNIT PROPERTY=VALUE... Sets one or more properties of a unit\n"
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" service-log-level SERVICE [LEVEL] Get/set logging threshold for service\n"
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" service-log-target SERVICE [TARGET] Get/set logging target for service\n"
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" reset-failed [PATTERN...] Reset failed state for all, one, or more\n"
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" units"
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"\n%3$sUnit File Commands:%4$s\n"
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@ -9034,6 +9128,8 @@ static int systemctl_main(int argc, char *argv[]) {
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{ "daemon-reexec", VERB_ANY, 1, VERB_ONLINE_ONLY, daemon_reload },
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{ "log-level", VERB_ANY, 2, VERB_ONLINE_ONLY, log_level },
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{ "log-target", VERB_ANY, 2, VERB_ONLINE_ONLY, log_target },
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{ "service-log-level", 2, 3, VERB_ONLINE_ONLY, service_log_setting },
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{ "service-log-target", 2, 3, VERB_ONLINE_ONLY, service_log_setting },
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{ "service-watchdogs", VERB_ANY, 2, VERB_ONLINE_ONLY, service_watchdogs },
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{ "show-environment", VERB_ANY, 1, VERB_ONLINE_ONLY, show_environment },
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{ "set-environment", 2, VERB_ANY, VERB_ONLINE_ONLY, set_environment },
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