Introduce LTTNG_RELAYD_WORKING_DIRECTORY environment variable

[lttng-tools.git] / src / bin / lttng-relayd / session.c

diff --git a/src/bin/lttng-relayd/session.c b/src/bin/lttng-relayd/session.c
index 31f27184f5e1abeefb0908dcb330b23d138b9c09..2f65848a9cedc2ed18bd56a630541b6922db8905 100644 (file)
--- a/src/bin/lttng-relayd/session.c
+++ b/src/bin/lttng-relayd/session.c
@@ -23,12 +23,15 @@
 #include <common/compat/uuid.h>
 #include <urcu/rculist.h>
 
+#include <sys/stat.h>
+
 #include "ctf-trace.h"
 #include "lttng-relayd.h"
 #include "session.h"
 #include "sessiond-trace-chunks.h"
 #include "stream.h"
 #include <common/defaults.h>
+#include "utils.h"
 
 /* Global session id used in the session creation. */
 static uint64_t last_relay_session_id;
@@ -128,31 +131,8 @@ static int session_set_anonymous_chunk(struct relay_session *session)
        struct lttng_trace_chunk *chunk = NULL;
        enum lttng_trace_chunk_status status;
        struct lttng_directory_handle output_directory;
-       char *output_path;
-       bool output_path_allocated = false;
-
-       if (!opt_output_path) {
-               /* No output path defined */
-               const char *home_dir = utils_get_home_dir();
-               if (!home_dir) {
-                       ERR("Home path not found."
-                                       " Please specify an output path using -o, --output PATH");
-                       ret = -1;
-                       goto end;
-               }
-               ret = asprintf(&output_path, "%s/%s", home_dir, DEFAULT_TRACE_DIR_NAME);
-               if (ret < 0) {
-                       PERROR("asprintf trace dir name");
-                       ret = -1;
-                       goto end;
-               }
-               output_path_allocated = true;
-       } else {
-               output_path = opt_output_path;
-               output_path_allocated = false;
-       }
 
-       ret = lttng_directory_handle_init(&output_directory, output_path);
+       ret = session_init_output_directory_handle(session, &output_directory);
        if (ret) {
                goto end;
        }
@@ -178,9 +158,6 @@ static int session_set_anonymous_chunk(struct relay_session *session)
 end:
        lttng_trace_chunk_put(chunk);
        lttng_directory_handle_fini(&output_directory);
-       if (output_path_allocated) {
-               free(output_path);
-       }
        return ret;
 }
 
@@ -204,17 +181,21 @@ struct relay_session *session_create(const char *session_name,
        int ret;
        struct relay_session *session = NULL;
 
-       if (session_name && strstr(session_name, ".")) {
+       assert(session_name);
+       assert(hostname);
+       assert(base_path);
+
+       if (strstr(session_name, ".")) {
                ERR("Illegal character in session name: \"%s\"",
                                session_name);
                goto error;
        }
-       if (base_path && strstr(base_path, "../")) {
+       if (strstr(base_path, "../")) {
                ERR("Invalid session base path walks up the path hierarchy: \"%s\"",
                                base_path);
                goto error;
        }
-       if (hostname && strstr(hostname, ".")) {
+       if (strstr(hostname, ".")) {
                ERR("Invalid character in hostname: \"%s\"",
                                hostname);
                goto error;
@@ -271,10 +252,14 @@ struct relay_session *session_create(const char *session_name,
                LTTNG_OPTIONAL_SET(&session->id_sessiond, *id_sessiond);
        }
 
-       ret = init_session_output_path(session);
-       if (ret) {
-               goto error;
+       if (major == 2 && minor >= 11) {
+               /* Only applies for 2.11+ peers using trace chunks. */
+               ret = init_session_output_path(session);
+               if (ret) {
+                       goto error;
+               }
        }
+
        ret = sessiond_trace_chunk_registry_session_created(
                        sessiond_trace_chunk_registry, sessiond_uuid);
        if (ret) {
@@ -408,6 +393,9 @@ void session_release(struct urcu_ref *ref)
 
 void session_put(struct relay_session *session)
 {
+       if (!session) {
+               return;
+       }
        rcu_read_lock();
        urcu_ref_put(&session->ref, session_release);
        rcu_read_unlock();
@@ -487,3 +475,38 @@ void print_sessions(void)
        }
        rcu_read_unlock();
 }
+
+int session_init_output_directory_handle(struct relay_session *session,
+               struct lttng_directory_handle *handle)
+{
+       int ret;
+       /*
+        * relayd_output_path/session_directory
+        * e.g. /home/user/lttng-traces/hostname/session_name
+        */
+       char *full_session_path = NULL;
+
+       pthread_mutex_lock(&session->lock);
+       full_session_path = create_output_path(session->output_path);
+       if (!full_session_path) {
+               ret = -1;
+               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;
+       }
+
+       ret = lttng_directory_handle_init(handle, full_session_path);
+       if (ret) {
+               goto end;
+       }
+end:
+       pthread_mutex_unlock(&session->lock);
+       free(full_session_path);
+       return ret;
+}