@@ -45,7 +45,7 @@ func newLogsCommand(dockerCli *command.DockerCli) *cobra.Command {

 	flags := cmd.Flags()

 	flags.BoolVar(&opts.noResolve, "no-resolve", false, "Do not map IDs to Names")

 	flags.BoolVarP(&opts.follow, "follow", "f", false, "Follow log output")

-	flags.StringVar(&opts.since, "since", "", "Show logs since timestamp")

+	flags.StringVar(&opts.since, "since", "", "Show logs since timestamp (e.g. 2013-01-02T13:23:37) or relative (e.g. 42m for 42 minutes)")

 	flags.BoolVarP(&opts.timestamps, "timestamps", "t", false, "Show timestamps")

 	flags.BoolVar(&opts.details, "details", false, "Show extra details provided to logs")

 	flags.StringVar(&opts.tail, "tail", "all", "Number of lines to show from the end of the logs")

@@ -417,7 +417,10 @@ func (c *containerAdapter) logs(ctx context.Context, options api.LogSubscription

 		if err != nil {

 			return nil, err

 		}

-		apiOptions.Since = since.Format(time.RFC3339Nano)

+		// print since as this formatted string because the docker container

+		// logs interface expects it like this.

+		// see github.com/docker/docker/api/types/time.ParseTimestamps

+		apiOptions.Since = fmt.Sprintf("%d.%09d", since.Unix(), int64(since.Nanosecond()))

 	}

 	if options.Tail < 0 {

@@ -6,7 +6,9 @@ import (

 	"fmt"

 	"io"

 	"os"

+	"strconv"

 	"strings"

+	"time"

 	"github.com/Sirupsen/logrus"

 	"github.com/docker/distribution/reference"

@@ -14,6 +16,7 @@ import (

 	apitypes "github.com/docker/docker/api/types"

 	"github.com/docker/docker/api/types/backend"

 	types "github.com/docker/docker/api/types/swarm"

+	timetypes "github.com/docker/docker/api/types/time"

 	"github.com/docker/docker/daemon/cluster/convert"

 	"github.com/docker/docker/daemon/logger"

 	"github.com/docker/docker/pkg/ioutils"

@@ -272,6 +275,44 @@ func (c *Cluster) ServiceLogs(ctx context.Context, input string, config *backend

 		stdStreams = append(stdStreams, swarmapi.LogStreamStderr)

 	}

+	// Get tail value squared away - the number of previous log lines we look at

+	var tail int64

+	if config.Tail == "all" {

+		// tail of 0 means send all logs on the swarmkit side

+		tail = 0

+	} else {

+		t, err := strconv.Atoi(config.Tail)

+		if err != nil {

+			return errors.New("tail value must be a positive integer or \"all\"")

+		}

+		if t < 0 {

+			return errors.New("negative tail values not supported")

+		}

+		// we actually use negative tail in swarmkit to represent messages

+		// backwards starting from the beginning. also, -1 means no logs. so,

+		// basically, for api compat with docker container logs, add one and

+		// flip the sign. we error above if you try to negative tail, which

+		// isn't supported by docker (and would error deeper in the stack

+		// anyway)

+		//

+		// See the logs protobuf for more information

+		tail = int64(-(t + 1))

+	}

+

+	// get the since value - the time in the past we're looking at logs starting from

+	var sinceProto *gogotypes.Timestamp

+	if config.Since != "" {

+		s, n, err := timetypes.ParseTimestamps(config.Since, 0)

+		if err != nil {

+			return errors.Wrap(err, "could not parse since timestamp")

+		}

+		since := time.Unix(s, n)

+		sinceProto, err = gogotypes.TimestampProto(since)

+		if err != nil {

+			return errors.Wrap(err, "could not parse timestamp to proto")

+		}

+	}

+

 	stream, err := state.logsClient.SubscribeLogs(ctx, &swarmapi.SubscribeLogsRequest{

 		Selector: &swarmapi.LogSelector{

 			ServiceIDs: []string{service.ID},

@@ -279,6 +320,8 @@ func (c *Cluster) ServiceLogs(ctx context.Context, input string, config *backend

 		Options: &swarmapi.LogSubscriptionOptions{

 			Follow:  config.Follow,

 			Streams: stdStreams,

+			Tail:    tail,

+			Since:   sinceProto,

 		},

 	})

 	if err != nil {

@@ -8,8 +8,10 @@ import (

 	"io"

 	"os/exec"

 	"strings"

+	"time"

 	"github.com/docker/docker/integration-cli/checker"

+	"github.com/docker/docker/integration-cli/daemon"

 	"github.com/go-check/check"

 )

@@ -49,6 +51,122 @@ func (s *DockerSwarmSuite) TestServiceLogs(c *check.C) {

 	}

 }

+// countLogLines returns a closure that can be used with waitAndAssert to

+// verify that a minimum number of expected container log messages have been

+// output.

+func countLogLines(d *daemon.Swarm, name string) func(*check.C) (interface{}, check.CommentInterface) {

+	return func(c *check.C) (interface{}, check.CommentInterface) {

+		out, err := d.Cmd("service", "logs", "-t", name)

+		c.Assert(err, checker.IsNil)

+		lines := strings.Split(strings.TrimSpace(out), "\n")

+		return len(lines), check.Commentf("output, %q", string(out))

+	}

+}

+

+func (s *DockerSwarmSuite) TestServiceLogsCompleteness(c *check.C) {

+	testRequires(c, ExperimentalDaemon)

+	d := s.AddDaemon(c, true, true)

+

+	name := "TestServiceLogsCompleteness"

+

+	// make a service that prints 6 lines

+	out, err := d.Cmd("service", "create", "--name", name, "busybox", "sh", "-c", "for line in $(seq 1 6); do echo log test $line; done; sleep 100000")

+	c.Assert(err, checker.IsNil)

+	c.Assert(strings.TrimSpace(out), checker.Not(checker.Equals), "")

+

+	// make sure task has been deployed.

+	waitAndAssert(c, defaultReconciliationTimeout, d.CheckActiveContainerCount, checker.Equals, 1)

+	// and make sure we have all the log lines

+	waitAndAssert(c, defaultReconciliationTimeout, countLogLines(d, name), checker.Equals, 6)

+

+	args := []string{"service", "logs", name}

+	cmd := exec.Command(dockerBinary, d.PrependHostArg(args)...)

+	r, w := io.Pipe()

+	cmd.Stdout = w

+	cmd.Stderr = w

+	c.Assert(cmd.Start(), checker.IsNil)

+

+	reader := bufio.NewReader(r)

+	// i have heard anecdotal reports that logs may come back from the engine

+	// mis-ordered. if this tests fails, consider the possibility that that

+	// might be occurring

+	for i := 1; i <= 6; i++ {

+		msg := &logMessage{}

+		msg.data, _, msg.err = reader.ReadLine()

+		c.Assert(msg.err, checker.IsNil)

+		c.Assert(string(msg.data), checker.Contains, fmt.Sprintf("log test %v", i))

+	}

+}

+

+func (s *DockerSwarmSuite) TestServiceLogsTail(c *check.C) {

+	testRequires(c, ExperimentalDaemon)

+	d := s.AddDaemon(c, true, true)

+

+	name := "TestServiceLogsTail"

+

+	// make a service that prints 6 lines

+	out, err := d.Cmd("service", "create", "--name", name, "busybox", "sh", "-c", "for line in $(seq 1 6); do echo log test $line; done; sleep 100000")

+	c.Assert(err, checker.IsNil)

+	c.Assert(strings.TrimSpace(out), checker.Not(checker.Equals), "")

+

+	// make sure task has been deployed.

+	waitAndAssert(c, defaultReconciliationTimeout, d.CheckActiveContainerCount, checker.Equals, 1)

+	waitAndAssert(c, defaultReconciliationTimeout, countLogLines(d, name), checker.Equals, 6)

+

+	args := []string{"service", "logs", "--tail=2", name}

+	cmd := exec.Command(dockerBinary, d.PrependHostArg(args)...)

+	r, w := io.Pipe()

+	cmd.Stdout = w

+	cmd.Stderr = w

+	c.Assert(cmd.Start(), checker.IsNil)

+

+	reader := bufio.NewReader(r)

+	// see TestServiceLogsCompleteness for comments about logs being well-

+	// ordered, if this flakes

+	for i := 5; i <= 6; i++ {

+		msg := &logMessage{}

+		msg.data, _, msg.err = reader.ReadLine()

+		c.Assert(msg.err, checker.IsNil)

+		c.Assert(string(msg.data), checker.Contains, fmt.Sprintf("log test %v", i))

+	}

+}

+

+func (s *DockerSwarmSuite) TestServiceLogsSince(c *check.C) {

+	// See DockerSuite.TestLogsSince, which is where this comes from

+	testRequires(c, ExperimentalDaemon)

+	d := s.AddDaemon(c, true, true)

+

+	name := "TestServiceLogsSince"

+

+	out, err := d.Cmd("service", "create", "--name", name, "busybox", "sh", "-c", "for i in $(seq 1 3); do sleep .1; echo log$i; done; sleep 10000000")

+	c.Assert(err, checker.IsNil)

+	c.Assert(strings.TrimSpace(out), checker.Not(checker.Equals), "")

+	waitAndAssert(c, defaultReconciliationTimeout, d.CheckActiveContainerCount, checker.Equals, 1)

+	// wait a sec for the logs to come in

+	waitAndAssert(c, defaultReconciliationTimeout, countLogLines(d, name), checker.Equals, 3)

+

+	out, err = d.Cmd("service", "logs", "-t", name)

+	c.Assert(err, checker.IsNil)

+

+	log2Line := strings.Split(strings.Split(out, "\n")[1], " ")

+	t, err := time.Parse(time.RFC3339Nano, log2Line[0]) // timestamp log2 is written

+	c.Assert(err, checker.IsNil)

+	u := t.Add(50 * time.Millisecond) // add .05s so log1 & log2 don't show up

+	since := u.Format(time.RFC3339Nano)

+

+	out, err = d.Cmd("service", "logs", "-t", fmt.Sprintf("--since=%v", since), name)

+	c.Assert(err, checker.IsNil)

+

+	unexpected := []string{"log1", "log2"}

+	expected := []string{"log3"}

+	for _, v := range unexpected {

+		c.Assert(out, checker.Not(checker.Contains), v, check.Commentf("unexpected log message returned, since=%v", u))

+	}

+	for _, v := range expected {

+		c.Assert(out, checker.Contains, v, check.Commentf("expected log message %v, was not present, since=%v", u))

+	}

+}

+

 func (s *DockerSwarmSuite) TestServiceLogsFollow(c *check.C) {

 	testRequires(c, ExperimentalDaemon)