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package main
import (
"os"
"time"
"github.com/containers/libpod/cmd/podman/cliconfig"
"github.com/containers/libpod/cmd/podman/libpodruntime"
"github.com/containers/libpod/libpod"
"github.com/containers/libpod/pkg/logs"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
"github.com/spf13/cobra"
)
var (
logsCommand cliconfig.LogsValues
logsDescription = `Retrieves logs for a container.
This does not guarantee execution order when combined with podman run (i.e. your run may not have generated any logs at the time you execute podman logs.
`
_logsCommand = &cobra.Command{
Use: "logs [flags] CONTAINER",
Short: "Fetch the logs of a container",
Long: logsDescription,
RunE: func(cmd *cobra.Command, args []string) error {
logsCommand.InputArgs = args
logsCommand.GlobalFlags = MainGlobalOpts
return logsCmd(&logsCommand)
},
Example: `podman logs ctrID
podman logs --tail 2 mywebserver
podman logs --follow=true --since 10m ctrID`,
}
)
func init() {
logsCommand.Command = _logsCommand
logsCommand.SetHelpTemplate(HelpTemplate())
logsCommand.SetUsageTemplate(UsageTemplate())
flags := logsCommand.Flags()
flags.BoolVar(&logsCommand.Details, "details", false, "Show extra details provided to the logs")
flags.BoolVarP(&logsCommand.Follow, "follow", "f", false, "Follow log output. The default is false")
flags.BoolVarP(&logsCommand.Latest, "latest", "l", false, "Act on the latest container podman is aware of")
flags.StringVar(&logsCommand.Since, "since", "", "Show logs since TIMESTAMP")
flags.Uint64Var(&logsCommand.Tail, "tail", 0, "Output the specified number of LINES at the end of the logs. Defaults to 0, which prints all lines")
flags.BoolVarP(&logsCommand.Timestamps, "timestamps", "t", false, "Output the timestamps in the log")
flags.MarkHidden("details")
flags.SetInterspersed(false)
markFlagHiddenForRemoteClient("latest", flags)
}
func logsCmd(c *cliconfig.LogsValues) error {
var ctr *libpod.Container
var err error
runtime, err := libpodruntime.GetRuntime(&c.PodmanCommand)
if err != nil {
return errors.Wrapf(err, "could not get runtime")
}
defer runtime.Shutdown(false)
args := c.InputArgs
if len(args) != 1 && !c.Latest {
return errors.Errorf("'podman logs' requires exactly one container name/ID")
}
sinceTime := time.Time{}
if c.Flag("since").Changed {
// parse time, error out if something is wrong
since, err := parseInputTime(c.Since)
if err != nil {
return errors.Wrapf(err, "could not parse time: %q", c.Since)
}
sinceTime = since
}
opts := &logs.LogOptions{
Details: c.Details,
Follow: c.Follow,
Since: sinceTime,
Tail: c.Tail,
Timestamps: c.Timestamps,
}
if c.Latest {
ctr, err = runtime.GetLatestContainer()
} else {
ctr, err = runtime.LookupContainer(args[0])
}
if err != nil {
return err
}
logPath := ctr.LogPath()
state, err := ctr.State()
if err != nil {
return err
}
// If the log file does not exist yet and the container is in the
// Configured state, it has never been started before and no logs exist
// Exit cleanly in this case
if _, err := os.Stat(logPath); err != nil {
if state == libpod.ContainerStateConfigured {
logrus.Debugf("Container has not been started, no logs exist yet")
return nil
}
}
return logs.ReadLogs(logPath, ctr, opts)
}
// parseInputTime takes the users input and to determine if it is valid and
// returns a time format and error. The input is compared to known time formats
// or a duration which implies no-duration
func parseInputTime(inputTime string) (time.Time, error) {
timeFormats := []string{time.RFC3339Nano, time.RFC3339, "2006-01-02T15:04:05", "2006-01-02T15:04:05.999999999",
"2006-01-02Z07:00", "2006-01-02"}
// iterate the supported time formats
for _, tf := range timeFormats {
t, err := time.Parse(tf, inputTime)
if err == nil {
return t, nil
}
}
// input might be a duration
duration, err := time.ParseDuration(inputTime)
if err != nil {
return time.Time{}, errors.Errorf("unable to interpret time value")
}
return time.Now().Add(-duration), nil
}
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