machinectl: add --value option

man/machinectl.xml

@@ -136,6 +136,13 @@
         (<literal>.</literal>).</para></listitem>
       </varlistentry>
 
+       <varlistentry>
+        <term><option>--value</option></term>
+
+        <listitem><para>When printing properties with <command>show</command>, only print the value,
+        and skip the property name and <literal>=</literal>.</para></listitem>
+      </varlistentry>
+
       <varlistentry>
         <term><option>-l</option></term>
         <term><option>--full</option></term>

src/machine/machinectl.c

@@ -61,6 +61,7 @@
 
 static char **arg_property = NULL;
 static bool arg_all = false;
+static bool arg_value = false;
 static bool arg_full = false;
 static bool arg_no_pager = false;
 static bool arg_legend = true;
@@ -680,7 +681,7 @@ static int show_machine_properties(sd_bus *bus, const char *path, bool *new_line
 
         *new_line = true;
 
-        r = bus_print_all_properties(bus, "org.freedesktop.machine1", path, arg_property, arg_all);
+        r = bus_print_all_properties(bus, "org.freedesktop.machine1", path, arg_property, arg_value, arg_all);
         if (r < 0)
                 log_error_errno(r, "Could not get properties: %m");
 
@@ -929,7 +930,7 @@ static int show_image_properties(sd_bus *bus, const char *path, bool *new_line)
 
         *new_line = true;
 
-        r = bus_print_all_properties(bus, "org.freedesktop.machine1", path, arg_property, arg_all);
+        r = bus_print_all_properties(bus, "org.freedesktop.machine1", path, arg_property, arg_value, arg_all);
         if (r < 0)
                 log_error_errno(r, "Could not get properties: %m");
 
@@ -2356,6 +2357,7 @@ static int help(int argc, char *argv[], void *userdata) {
                "  -p --property=NAME          Show only properties by this name\n"
                "  -q --quiet                  Suppress output\n"
                "  -a --all                    Show all properties, including empty ones\n"
+               "     --value                  When showing properties, only print the value\n"
                "  -l --full                   Do not ellipsize output\n"
                "     --kill-who=WHO           Who to send signal to\n"
                "  -s --signal=SIGNAL          Which signal to send\n"
@@ -2418,6 +2420,7 @@ static int parse_argv(int argc, char *argv[]) {
                 ARG_VERSION = 0x100,
                 ARG_NO_PAGER,
                 ARG_NO_LEGEND,
+                ARG_VALUE,
                 ARG_KILL_WHO,
                 ARG_READ_ONLY,
                 ARG_MKDIR,
@@ -2434,6 +2437,7 @@ static int parse_argv(int argc, char *argv[]) {
                 { "version",         no_argument,       NULL, ARG_VERSION         },
                 { "property",        required_argument, NULL, 'p'                 },
                 { "all",             no_argument,       NULL, 'a'                 },
+                { "value",           no_argument,       NULL, ARG_VALUE           },
                 { "full",            no_argument,       NULL, 'l'                 },
                 { "no-pager",        no_argument,       NULL, ARG_NO_PAGER        },
                 { "no-legend",       no_argument,       NULL, ARG_NO_LEGEND       },
@@ -2485,6 +2489,10 @@ static int parse_argv(int argc, char *argv[]) {
                         arg_all = true;
                         break;
 
+                case ARG_VALUE:
+                        arg_value = true;
+                        break;
+
                 case 'l':
                         arg_full = true;
                         break;

src/shared/bus-util.c

@@ -930,7 +930,7 @@ int bus_print_property(const char *name, sd_bus_message *property, bool value, b
         return 0;
 }
 
-int bus_print_all_properties(sd_bus *bus, const char *dest, const char *path, char **filter, bool all) {
+int bus_print_all_properties(sd_bus *bus, const char *dest, const char *path, char **filter, bool value, bool all) {
         _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
         _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
         int r;
@@ -970,7 +970,7 @@ int bus_print_all_properties(sd_bus *bus, const char *dest, const char *path, ch
                         if (r < 0)
                                 return r;
 
-                        r = bus_print_property(name, reply, false, all);
+                        r = bus_print_property(name, reply, value, all);
                         if (r < 0)
                                 return r;
                         if (r == 0) {

src/shared/bus-util.h

@@ -79,7 +79,7 @@ int bus_connect_transport(BusTransport transport, const char *host, bool user, s
 int bus_connect_transport_systemd(BusTransport transport, const char *host, bool user, sd_bus **bus);
 
 int bus_print_property(const char *name, sd_bus_message *property, bool value, bool all);
-int bus_print_all_properties(sd_bus *bus, const char *dest, const char *path, char **filter, bool all);
+int bus_print_all_properties(sd_bus *bus, const char *dest, const char *path, char **filter, bool value, bool all);
 
 int bus_property_get_bool(sd_bus *bus, const char *path, const char *interface, const char *property, sd_bus_message *reply, void *userdata, sd_bus_error *error);