systemctl: drop useless DBus calls from 'systemctl show foo.service'
systemctl called LoadUnit, GetUnit, GetAll in this order to get the properties. It is useless to load units explicitly, because it won't ensure anything. The unit may be freed immediately by the garbage collector. It is unnecessary to call GetUnit, because systemctl can easily translate the unit name to DBus path by itself. GetAll will load the unit if necessary.
This commit is contained in:
Michal Schmidt
parent
80fbf05e75
commit
a223b325b4
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@ -2955,18 +2955,70 @@ finish:
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return r;
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}
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static int show(DBusConnection *bus, char **args) {
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static int show_one_by_pid(const char *verb, DBusConnection *bus, uint32_t pid, bool *new_line) {
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DBusMessage *m = NULL, *reply = NULL;
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int r, ret = 0;
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const char *path = NULL;
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DBusError error;
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int r;
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dbus_error_init(&error);
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m = dbus_message_new_method_call(
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"org.freedesktop.systemd1",
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"/org/freedesktop/systemd1",
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"org.freedesktop.systemd1.Manager",
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"GetUnitByPID");
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if (!m) {
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log_error("Could not allocate message.");
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r = -ENOMEM;
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goto finish;
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}
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if (!dbus_message_append_args(m,
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DBUS_TYPE_UINT32, &pid,
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DBUS_TYPE_INVALID)) {
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log_error("Could not append arguments to message.");
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r = -ENOMEM;
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goto finish;
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}
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reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error);
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if (!reply) {
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log_error("Failed to issue method call: %s", bus_error_message(&error));
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r = -EIO;
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goto finish;
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}
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if (!dbus_message_get_args(reply, &error,
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DBUS_TYPE_OBJECT_PATH, &path,
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DBUS_TYPE_INVALID)) {
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log_error("Failed to parse reply: %s", bus_error_message(&error));
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r = -EIO;
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goto finish;
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}
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r = show_one(verb, bus, path, false, new_line);
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finish:
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if (m)
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dbus_message_unref(m);
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if (reply)
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dbus_message_unref(reply);
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dbus_error_free(&error);
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return r;
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}
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static int show(DBusConnection *bus, char **args) {
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int r, ret = 0;
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bool show_properties, new_line = false;
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char **name;
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assert(bus);
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assert(args);
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dbus_error_init(&error);
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show_properties = !streq(args[0], "status");
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if (show_properties)
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@ -2976,157 +3028,55 @@ static int show(DBusConnection *bus, char **args) {
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/* If not argument is specified inspect the manager
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* itself */
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ret = show_one(args[0], bus, "/org/freedesktop/systemd1", show_properties, &new_line);
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goto finish;
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return show_one(args[0], bus, "/org/freedesktop/systemd1", show_properties, &new_line);
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}
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STRV_FOREACH(name, args+1) {
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const char *path = NULL;
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uint32_t id;
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if (safe_atou32(*name, &id) < 0) {
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/* Interpret as unit name */
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if (!(m = dbus_message_new_method_call(
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"org.freedesktop.systemd1",
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"/org/freedesktop/systemd1",
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"org.freedesktop.systemd1.Manager",
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"LoadUnit"))) {
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log_error("Could not allocate message.");
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ret = -ENOMEM;
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goto finish;
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}
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char *e, *p;
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e = bus_path_escape(*name);
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if (!e)
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return -ENOMEM;
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p = strappend("/org/freedesktop/systemd1/unit/", e);
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free(e);
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if (!p)
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return -ENOMEM;
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if (!dbus_message_append_args(m,
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DBUS_TYPE_STRING, name,
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DBUS_TYPE_INVALID)) {
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log_error("Could not append arguments to message.");
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ret = -ENOMEM;
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goto finish;
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}
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r = show_one(args[0], bus, p, show_properties, &new_line);
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free(p);
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if (!(reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error))) {
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if (!dbus_error_has_name(&error, DBUS_ERROR_ACCESS_DENIED)) {
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log_error("Failed to issue method call: %s", bus_error_message(&error));
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ret = -EIO;
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goto finish;
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}
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dbus_error_free(&error);
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dbus_message_unref(m);
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if (!(m = dbus_message_new_method_call(
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"org.freedesktop.systemd1",
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"/org/freedesktop/systemd1",
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"org.freedesktop.systemd1.Manager",
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"GetUnit"))) {
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log_error("Could not allocate message.");
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ret = -ENOMEM;
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goto finish;
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}
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if (!dbus_message_append_args(m,
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DBUS_TYPE_STRING, name,
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DBUS_TYPE_INVALID)) {
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log_error("Could not append arguments to message.");
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ret = -ENOMEM;
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goto finish;
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}
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if (!(reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error))) {
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log_error("Failed to issue method call: %s", bus_error_message(&error));
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if (dbus_error_has_name(&error, BUS_ERROR_NO_SUCH_UNIT))
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ret = 4; /* According to LSB: "program or service status is unknown" */
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else
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ret = -EIO;
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goto finish;
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}
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}
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if (r != 0)
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ret = r;
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} else if (show_properties) {
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/* Interpret as job id */
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if (!(m = dbus_message_new_method_call(
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"org.freedesktop.systemd1",
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"/org/freedesktop/systemd1",
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"org.freedesktop.systemd1.Manager",
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"GetJob"))) {
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log_error("Could not allocate message.");
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ret = -ENOMEM;
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goto finish;
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}
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char *p;
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if (asprintf(&p, "/org/freedesktop/systemd1/job/%u", id) < 0)
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return -ENOMEM;
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if (!dbus_message_append_args(m,
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DBUS_TYPE_UINT32, &id,
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DBUS_TYPE_INVALID)) {
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log_error("Could not append arguments to message.");
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ret = -ENOMEM;
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goto finish;
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}
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r = show_one(args[0], bus, p, show_properties, &new_line);
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free(p);
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if (r != 0)
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ret = r;
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if (!(reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error))) {
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log_error("Failed to issue method call: %s", bus_error_message(&error));
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ret = -EIO;
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goto finish;
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}
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} else {
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/* Interpret as PID */
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if (!(m = dbus_message_new_method_call(
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"org.freedesktop.systemd1",
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"/org/freedesktop/systemd1",
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"org.freedesktop.systemd1.Manager",
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"GetUnitByPID"))) {
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log_error("Could not allocate message.");
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ret = -ENOMEM;
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goto finish;
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}
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if (!dbus_message_append_args(m,
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DBUS_TYPE_UINT32, &id,
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DBUS_TYPE_INVALID)) {
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log_error("Could not append arguments to message.");
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ret = -ENOMEM;
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goto finish;
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}
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if (!(reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error))) {
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log_error("Failed to issue method call: %s", bus_error_message(&error));
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ret = -EIO;
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goto finish;
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}
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r = show_one_by_pid(args[0], bus, id, &new_line);
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if (r != 0)
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ret = r;
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}
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if (!dbus_message_get_args(reply, &error,
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DBUS_TYPE_OBJECT_PATH, &path,
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DBUS_TYPE_INVALID)) {
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log_error("Failed to parse reply: %s", bus_error_message(&error));
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ret = -EIO;
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goto finish;
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}
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if ((r = show_one(args[0], bus, path, show_properties, &new_line)) != 0)
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ret = r;
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dbus_message_unref(m);
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dbus_message_unref(reply);
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m = reply = NULL;
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}
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finish:
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if (m)
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dbus_message_unref(m);
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if (reply)
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dbus_message_unref(reply);
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dbus_error_free(&error);
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return ret;
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}
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