Remove direct dependency on code.cloudfoundry.org/clock

Replace Clock field with a simpler func() time.Time that defaults to
time.Now.

This still allows time injection in tests if needed, without pulling in
a full Clock interface when only Now() is used.

The clock.Clock.Now() implementation just wraps time.Now(), so there
is no difference in time resolution or behavior.

The package is an indirect dependency via swarmkit.

Signed-off-by: Paweł Gronowski <pawel.gronowski@docker.com>

daemon/logger/journald/internal/fake/sender.go

@@ -19,7 +19,6 @@ import (
 	"testing"
 	"time"
 
-	"code.cloudfoundry.org/clock"
 	"github.com/coreos/go-systemd/v22/journal"
 	"github.com/google/uuid"
 	"github.com/moby/moby/v2/daemon/internal/lazyregexp"
@@ -60,8 +59,9 @@ type Sender struct {
 	CmdName    string
 	OutputPath string
 
-	// Clock for timestamping sent messages.
-	Clock clock.Clock
+	// Now returns the current time for timestamping sent messages.
+	// Defaults to time.Now if nil.
+	Now func() time.Time
 	// Whether to assign the event's realtime timestamp to the time
 	// specified by the SYSLOG_TIMESTAMP variable value. This is roughly
 	// analogous to journald receiving the event and assigning it a
@@ -90,7 +90,6 @@ func New(outpath string) (*Sender, error) {
 	sender := &Sender{
 		CmdName:    p,
 		OutputPath: outpath,
-		Clock:      clock.NewClock(),
 		BootID:     uuid.New(), // UUIDv4, like systemd itself generates for sd_id128 values.
 	}
 	return sender, nil
@@ -130,7 +129,11 @@ func (s *Sender) Send(message string, priority journal.Priority, vars map[string
 			return fmt.Errorf("fake: error parsing SYSLOG_TIMESTAMP value %q: %w", ts, err)
 		}
 	} else {
-		ts = s.Clock.Now()
+		now := s.Now
+		if now == nil {
+			now = time.Now
+		}
+		ts = now()
 	}
 	if err := export.WriteField(&buf, "__REALTIME_TIMESTAMP", strconv.FormatInt(ts.UnixMicro(), 10)); err != nil {
 		return fmt.Errorf("fake: error writing entry to systemd-journal-remote: %w", err)

go.mod

@@ -5,7 +5,6 @@ go 1.25.5
 require (
 	cloud.google.com/go/compute/metadata v0.9.0
 	cloud.google.com/go/logging v1.13.1
-	code.cloudfoundry.org/clock v1.60.0
 	dario.cat/mergo v1.0.2
 	github.com/AdaLogics/go-fuzz-headers v0.0.0-20240806141605-e8a1dd7889d6
 	github.com/Azure/go-ansiterm v0.0.0-20250102033503-faa5f7b0171c
@@ -126,6 +125,7 @@ require (
 	cloud.google.com/go/auth v0.18.0 // indirect
 	cloud.google.com/go/auth/oauth2adapt v0.2.8 // indirect
 	cloud.google.com/go/longrunning v0.7.0 // indirect
+	code.cloudfoundry.org/clock v1.60.0 // indirect
 	cyphar.com/go-pathrs v0.2.1 // indirect
 	github.com/Azure/azure-sdk-for-go/sdk/azcore v1.20.0 // indirect
 	github.com/Azure/azure-sdk-for-go/sdk/internal v1.11.2 // indirect