// configureLoggers sets up the standard out/error file rotators
func (e *UniversalExecutor) configureLoggers() error {
e.rotatorLock.Lock()
defer e.rotatorLock.Unlock()
logFileSize := int64(e.ctx.Task.LogConfig.MaxFileSizeMB * 1024 * 1024)
if e.lro == nil {
lro, err := logging.NewFileRotator(e.ctx.AllocDir.LogDir(), fmt.Sprintf("%v.stdout", e.ctx.Task.Name),
e.ctx.Task.LogConfig.MaxFiles, logFileSize, e.logger)
if err != nil {
return err
}
e.lro = lro
}
if e.lre == nil {
lre, err := logging.NewFileRotator(e.ctx.AllocDir.LogDir(), fmt.Sprintf("%v.stderr", e.ctx.Task.Name),
e.ctx.Task.LogConfig.MaxFiles, logFileSize, e.logger)
if err != nil {
return err
}
e.lre = lre
}
return nil
}
// LaunchCmd launches a process and returns it's state. It also configures an
// applies isolation on certain platforms.
func (e *UniversalExecutor) LaunchCmd(command *ExecCommand, ctx *ExecutorContext) (*ProcessState, error) {
e.logger.Printf("[DEBUG] executor: launching command %v %v", command.Cmd, strings.Join(command.Args, " "))
e.ctx = ctx
// configuring the task dir
if err := e.configureTaskDir(); err != nil {
return nil, err
}
// configuring the chroot, cgroup and enters the plugin process in the
// chroot
if err := e.configureIsolation(); err != nil {
return nil, err
}
// setting the user of the process
if e.ctx.UnprivilegedUser {
if err := e.runAs("nobody"); err != nil {
return nil, err
}
}
logFileSize := int64(ctx.LogConfig.MaxFileSizeMB * 1024 * 1024)
lro, err := logging.NewFileRotator(ctx.AllocDir.LogDir(), fmt.Sprintf("%v.stdout", ctx.TaskName),
ctx.LogConfig.MaxFiles, logFileSize, e.logger)
if err != nil {
return nil, fmt.Errorf("error creating log rotator for stdout of task %v", err)
}
e.cmd.Stdout = lro
e.lro = lro
lre, err := logging.NewFileRotator(ctx.AllocDir.LogDir(), fmt.Sprintf("%v.stderr", ctx.TaskName),
ctx.LogConfig.MaxFiles, logFileSize, e.logger)
if err != nil {
return nil, fmt.Errorf("error creating log rotator for stderr of task %v", err)
}
e.cmd.Stderr = lre
e.lre = lre
// setting the env, path and args for the command
e.ctx.TaskEnv.Build()
e.cmd.Env = ctx.TaskEnv.EnvList()
e.cmd.Path = ctx.TaskEnv.ReplaceEnv(command.Cmd)
e.cmd.Args = append([]string{e.cmd.Path}, ctx.TaskEnv.ParseAndReplace(command.Args)...)
if filepath.Base(command.Cmd) == command.Cmd {
if lp, err := exec.LookPath(command.Cmd); err != nil {
} else {
e.cmd.Path = lp
}
}
// starting the process
if err := e.cmd.Start(); err != nil {
return nil, fmt.Errorf("error starting command: %v", err)
}
go e.wait()
ic := &cstructs.IsolationConfig{Cgroup: e.groups}
return &ProcessState{Pid: e.cmd.Process.Pid, ExitCode: -1, IsolationConfig: ic, Time: time.Now()}, nil
}