+static int init_session_output_path_group_by_session(
+ struct relay_session *session)
+{
+ /*
+ * session_directory:
+ *
+ * session_name/hostname-creation_time/base_path
+ *
+ * For session name including the datetime, use it as the complete name
+ * since. Do not perform modification on it since the datetime is an
+ * integral part of the name and how a user identify a session.
+ */
+ int ret = 0;
+ char *session_directory = NULL;
+ char creation_datetime[DATETIME_STR_LEN];
+
+ if (session->output_path[0] != '\0') {
+ /* output_path as been generated already */
+ goto end;
+ }
+
+ ret = time_to_datetime_str(LTTNG_OPTIONAL_GET(session->creation_time),
+ creation_datetime, sizeof(creation_datetime));
+ if (ret) {
+ ERR("Failed to format session creation timestamp while initializing session output directory handle");
+ ret = -1;
+ goto end;
+ }
+
+ ret = asprintf(&session_directory, "%s/%s-%s%s%s",
+ session->session_name, session->hostname,
+ creation_datetime,
+ session->base_path[0] != '\0' ? "/" : "",
+ session->base_path);
+ if (ret < 0) {
+ PERROR("Failed to format session directory name");
+ goto end;
+ }
+
+ if (strlen(session_directory) >= LTTNG_PATH_MAX) {
+ ERR("Session output directory exceeds maximal length");
+ ret = -1;
+ goto end;
+ }
+
+ strcpy(session->output_path, session_directory);
+ ret = 0;
+
+end:
+ free(session_directory);
+ return ret;
+}
+
+static int init_session_output_path(struct relay_session *session)
+{
+ int ret;
+
+ switch (opt_group_output_by) {
+ case RELAYD_GROUP_OUTPUT_BY_HOST:
+ ret = init_session_output_path_group_by_host(session);
+ break;
+ case RELAYD_GROUP_OUTPUT_BY_SESSION:
+ ret = init_session_output_path_group_by_session(session);
+ break;
+ case RELAYD_GROUP_OUTPUT_BY_UNKNOWN:
+ default:
+ abort();
+ break;
+ }
+
+ return ret;
+}
+
+static struct lttng_directory_handle *session_create_output_directory_handle(
+ struct relay_session *session)
+{
+ int ret;
+ /*
+ * relayd_output_path/session_directory
+ * e.g. /home/user/lttng-traces/hostname/session_name
+ */
+ char *full_session_path = NULL;
+ struct lttng_directory_handle *handle = NULL;
+
+ pthread_mutex_lock(&session->lock);
+ full_session_path = create_output_path(session->output_path);
+ if (!full_session_path) {
+ goto end;
+ }
+
+ ret = utils_mkdir_recursive(
+ full_session_path, S_IRWXU | S_IRWXG, -1, -1);
+ if (ret) {
+ ERR("Failed to create session output path \"%s\"",
+ full_session_path);
+ goto end;
+ }
+
+ handle = lttng_directory_handle_create(full_session_path);
+end:
+ pthread_mutex_unlock(&session->lock);
+ free(full_session_path);
+ return handle;
+}
+