package libpod import ( "os" "time" "github.com/containers/libpod/libpod/define" "github.com/containers/libpod/libpod/logs" "github.com/pkg/errors" "github.com/sirupsen/logrus" ) // Log is a runtime function that can read one or more container logs. func (r *Runtime) Log(containers []*Container, options *logs.LogOptions, logChannel chan *logs.LogLine) error { for _, ctr := range containers { if err := ctr.ReadLog(options, logChannel); err != nil { return err } } return nil } // ReadLog reads a containers log based on the input options and returns loglines over a channel. func (c *Container) ReadLog(options *logs.LogOptions, logChannel chan *logs.LogLine) error { // TODO Skip sending logs until journald logs can be read // TODO make this not a magic string if c.LogDriver() == define.JournaldLogging { return c.readFromJournal(options, logChannel) } return c.readFromLogFile(options, logChannel) } func (c *Container) readFromLogFile(options *logs.LogOptions, logChannel chan *logs.LogLine) error { t, tailLog, err := logs.GetLogFile(c.LogPath(), options) if err != nil { // If the log file does not exist, this is not fatal. if os.IsNotExist(errors.Cause(err)) { return nil } return errors.Wrapf(err, "unable to read log file %s for %s ", c.ID(), c.LogPath()) } options.WaitGroup.Add(1) if len(tailLog) > 0 { for _, nll := range tailLog { nll.CID = c.ID() nll.CName = c.Name() if nll.Since(options.Since) { logChannel <- nll } } } go func() { var partial string for line := range t.Lines { nll, err := logs.NewLogLine(line.Text) if err != nil { logrus.Error(err) continue } if nll.Partial() { partial += nll.Msg continue } else if !nll.Partial() && len(partial) > 1 { nll.Msg = partial + nll.Msg partial = "" } nll.CID = c.ID() nll.CName = c.Name() if nll.Since(options.Since) { logChannel <- nll } } options.WaitGroup.Done() }() // Check if container is still running or paused go func() { if options.Follow { for { state, err := c.State() if err != nil && errors.Cause(err) != define.ErrNoSuchCtr { logrus.Error(err) break } else if err != nil { break } if state != define.ContainerStateRunning && state != define.ContainerStatePaused { err := t.Stop() if err != nil { logrus.Error(err) } break } time.Sleep(1 * time.Second) } } }() return nil }