logrotate: don't exit at non-running instance

Just warn that the instance is not running and continue (like `tt stop`
or `tt kill` do)

Closes #774

cli/cmd/logrotate.go

@@ -47,11 +47,10 @@ func internalLogrotateModule(cmdCtx *cmdcontext.CmdCtx, args []string) error {
 	}
 
 	for _, run := range runningCtx.Instances {
-		res, err := running.Logrotate(&run)
+		err := running.Logrotate(&run)
 		if err != nil {
-			return err
+			log.Infof(err.Error())
 		}
-		log.Info(res)
 	}
 
 	return nil

cli/running/running.go

@@ -858,24 +858,27 @@ func Status(run *InstanceCtx) process_utils.ProcessState {
 }
 
 // Logrotate rotates logs of a started tarantool instance.
-func Logrotate(run *InstanceCtx) (string, error) {
+func Logrotate(run *InstanceCtx) error {
+	fullInstanceName := GetAppInstanceName(*run)
+
 	pid, err := process_utils.GetPIDFromFile(run.PIDFile)
 	if err != nil {
-		return "", errors.New(instStateStopped.String())
+		return fmt.Errorf("%s: the instance is not running, it must be started", fullInstanceName)
 	}
 
 	alive, err := process_utils.IsProcessAlive(pid)
 	if !alive {
-		return "", errors.New(instStateDead.String())
+		return errors.New(instStateDead.String())
 	}
 
 	if err := syscall.Kill(pid, syscall.Signal(syscall.SIGHUP)); err != nil {
-		return "", fmt.Errorf(`can't rotate logs: "%v"`, err)
+		return fmt.Errorf(`can't rotate logs: "%v"`, err)
 	}
 
 	// Rotates logs [instance name pid]
-	fullInstanceName := GetAppInstanceName(*run)
-	return fmt.Sprintf("%s: logs has been rotated. PID: %v.", fullInstanceName, pid), nil
+	log.Infof("%s (PID = %v): logs has been rotated.", fullInstanceName, pid)
+
+	return nil
 }
 
 // Check returns the result of checking the syntax of the application file.

test/integration/logrotate/test_logrotate.py

@@ -30,31 +30,26 @@ def post_start(tt_app, instances):
 
     # Do logrotate.
     rc, out = tt_app.logrotate(target)
-
-    # If any of the requested instances is not running return failure.
-    for inst in tt_app.instances_of(target):
-        if not tt_app.is_instance_of(inst, *running_targets):
-            assert rc != 0
-            assert "NOT RUNNING" in out
-            return
+    assert rc == 0
 
     # Wait for the log files to be re-created.
     tt_app_wait_log_files(tt_app, tt_app.instances_of(target))
 
     # Check the instances.
-    assert rc == 0
     status = tt_app.status()
     for inst in tt_app.instances:
         inst_id = tt_app.inst_id(inst)
         was_running = tt_app.is_instance_of(inst, *running_targets)
         if tt_app.is_instance_of(inst, target):
-            assert was_running
-            assert status[inst_id]["STATUS"] == "RUNNING"
-            assert status[inst_id]["PID"] == orig_status[inst_id]["PID"]
-            pid = status[inst_id]["PID"]
-            assert f"{inst_id}: logs has been rotated. PID: {pid}" in out
-            with open(tt_app.log_path(inst, log_file)) as f:
-                assert "reopened" in f.read()
+            if was_running:
+                assert status[inst_id]["STATUS"] == "RUNNING"
+                pid = status[inst_id]["PID"]
+                assert pid == orig_status[inst_id]["PID"]
+                assert f"{inst_id} (PID = {pid}): logs has been rotated." in out
+                with open(tt_app.log_path(inst, log_file)) as f:
+                    assert "reopened" in f.read()
+            else:
+                assert f"{inst_id}: the instance is not running, it must be started" in out
         else:
             assert inst_id not in out
             assert status[inst_id]["STATUS"] == orig_status[inst_id]["STATUS"]