[systemd-devel] [PATCH] core: Filter by state behind the D-Bus API, not in the systemctl client.

[david at davidstrauss.net]

From: David Strauss <david at davidstrauss.net>

---
 src/core/dbus-manager.c                | 24 +++++++++++++++++++++++-
 src/core/org.freedesktop.systemd1.conf |  4 ++++
 src/systemctl/systemctl.c              | 24 +++++++++++++-----------
 3 files changed, 40 insertions(+), 12 deletions(-)

diff --git a/src/core/dbus-manager.c b/src/core/dbus-manager.c
index 135d314..febf475 100644
--- a/src/core/dbus-manager.c
+++ b/src/core/dbus-manager.c
@@ -728,7 +728,7 @@ static int method_reset_failed(sd_bus *bus, sd_bus_message *message, void *userd
         return sd_bus_reply_method_return(message, NULL);
 }
 
-static int method_list_units(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
+static int list_units_filtered(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error, char **states) {
         _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
         Manager *m = userdata;
         const char *k;
@@ -761,6 +761,12 @@ static int method_list_units(sd_bus *bus, sd_bus_message *message, void *userdat
 
                 following = unit_following(u);
 
+                if (!strv_isempty(states) &&
+                    !strv_contains(states, unit_load_state_to_string(u->load_state)) &&
+                    !strv_contains(states, unit_active_state_to_string(unit_active_state(u))) &&
+                    !strv_contains(states, unit_sub_state_to_string(u)))
+                        continue;
+
                 unit_path = unit_dbus_path(u);
                 if (!unit_path)
                         return -ENOMEM;
@@ -794,6 +800,21 @@ static int method_list_units(sd_bus *bus, sd_bus_message *message, void *userdat
         return sd_bus_send(bus, reply, NULL);
 }
 
+static int method_list_units(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
+        return list_units_filtered(bus, message, userdata, error, NULL);
+}
+
+static int method_list_units_filtered(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
+        _cleanup_strv_free_ char **states = NULL;
+        int r;
+
+        r = sd_bus_message_read_strv(message, &states);
+        if (r < 0)
+                return r;
+
+        return list_units_filtered(bus, message, userdata, error, states);
+}
+
 static int method_list_jobs(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
         _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
         Manager *m = userdata;
@@ -1670,6 +1691,7 @@ const sd_bus_vtable bus_manager_vtable[] = {
         SD_BUS_METHOD("ClearJobs", NULL, NULL, method_clear_jobs, 0),
         SD_BUS_METHOD("ResetFailed", NULL, NULL, method_reset_failed, 0),
         SD_BUS_METHOD("ListUnits", NULL, "a(ssssssouso)", method_list_units, SD_BUS_VTABLE_UNPRIVILEGED),
+        SD_BUS_METHOD("ListUnitsFiltered", "as", "a(ssssssouso)", method_list_units_filtered, SD_BUS_VTABLE_UNPRIVILEGED),
         SD_BUS_METHOD("ListJobs", NULL, "a(usssoo)", method_list_jobs, SD_BUS_VTABLE_UNPRIVILEGED),
         SD_BUS_METHOD("Subscribe", NULL, NULL, method_subscribe, SD_BUS_VTABLE_UNPRIVILEGED),
         SD_BUS_METHOD("Unsubscribe", NULL, NULL, method_unsubscribe, SD_BUS_VTABLE_UNPRIVILEGED),
diff --git a/src/core/org.freedesktop.systemd1.conf b/src/core/org.freedesktop.systemd1.conf
index a375dce..9dfca81 100644
--- a/src/core/org.freedesktop.systemd1.conf
+++ b/src/core/org.freedesktop.systemd1.conf
@@ -64,6 +64,10 @@
 
                 <allow send_destination="org.freedesktop.systemd1"
                        send_interface="org.freedesktop.systemd1.Manager"
+                       send_member="ListUnitsFiltered"/>
+
+                <allow send_destination="org.freedesktop.systemd1"
+                       send_interface="org.freedesktop.systemd1.Manager"
                        send_member="ListUnitFiles"/>
 
                 <allow send_destination="org.freedesktop.systemd1"
diff --git a/src/systemctl/systemctl.c b/src/systemctl/systemctl.c
index 7bc8ece..4b97cc0 100644
--- a/src/systemctl/systemctl.c
+++ b/src/systemctl/systemctl.c
@@ -319,12 +319,6 @@ static int compare_unit_info(const void *a, const void *b) {
 static bool output_show_unit(const UnitInfo *u, char **patterns) {
         const char *dot;
 
-        if (!strv_isempty(arg_states))
-                return
-                        strv_contains(arg_states, u->load_state) ||
-                        strv_contains(arg_states, u->sub_state) ||
-                        strv_contains(arg_states, u->active_state);
-
         if (!strv_isempty(patterns)) {
                 char **pattern;
 
@@ -513,6 +507,7 @@ static int get_unit_list(
                 int c,
                 sd_bus_message **_reply) {
 
+        _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
         _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
         _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
         size_t size = c;
@@ -523,15 +518,22 @@ static int get_unit_list(
         assert(unit_infos);
         assert(_reply);
 
-        r = sd_bus_call_method(
+        r = sd_bus_message_new_method_call(
                         bus,
+                        &m,
                         "org.freedesktop.systemd1",
                         "/org/freedesktop/systemd1",
                         "org.freedesktop.systemd1.Manager",
-                        "ListUnits",
-                        &error,
-                        &reply,
-                        NULL);
+                        "ListUnitsFiltered");
+
+        if (r < 0)
+                return bus_log_create_error(r);
+
+        r = sd_bus_message_append_strv(m, arg_states);
+        if (r < 0)
+                return bus_log_create_error(r);
+
+        r = sd_bus_call(bus, m, 0, &error, &reply);
         if (r < 0) {
                 log_error("Failed to list units: %s", bus_error_message(&error, r));
                 return r;
-- 
1.9.0