daemon: Simplify slices.Contains usage

Remove unnecessary intermediate variables and helper functions when
using slices.Contains.

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

daemon/libnetwork/networkdb/cluster.go

@@ -543,12 +543,7 @@ func (nDB *NetworkDB) bulkSyncTables() {
 		// successfully completed bulk sync in this iteration.
 		updatedNetworks := make([]string, 0, len(networks))
 		for _, nid := range networks {
-			var found bool
-			if slices.Contains(completed, nid) {
-				found = true
-			}
-
-			if !found {
+			if !slices.Contains(completed, nid) {
 				updatedNetworks = append(updatedNetworks, nid)
 			}
 		}

daemon/libnetwork/networkdb/delegate.go

@@ -154,10 +154,7 @@ func (nDB *NetworkDB) handleTableEvent(tEvent *TableEvent, isBulkSync bool) bool
 	network, ok := nDB.thisNodeNetworks[tEvent.NetworkID]
 	// Check if the owner of the event is still part of the network
 	nodes := nDB.networkNodes[tEvent.NetworkID]
-	var nodePresent bool
-	if slices.Contains(nodes, tEvent.NodeName) {
-		nodePresent = true
-	}
+	nodePresent := slices.Contains(nodes, tEvent.NodeName)
 
 	if !ok || network.leaving || !nodePresent {
 		// I'm out of the network OR the event owner is not anymore part of the network so do not propagate

daemon/libnetwork/networkdb/networkdb.go

@@ -730,8 +730,7 @@ func (nDB *NetworkDB) LeaveNetwork(nid string) error {
 // in the passed network only if it is not already present. Caller
 // should hold the NetworkDB lock while calling this
 func (nDB *NetworkDB) addNetworkNode(nid string, nodeName string) {
-	nodes := nDB.networkNodes[nid]
-	if slices.Contains(nodes, nodeName) {
+	if slices.Contains(nDB.networkNodes[nid], nodeName) {
 		return
 	}
 

daemon/oci_linux.go

@@ -466,12 +466,6 @@ var (
 	}
 )
 
-// inSlice tests whether a string is contained in a slice of strings or not.
-// Comparison is case sensitive
-func inSlice(slice []string, s string) bool {
-	return slices.Contains(slice, s)
-}
-
 // withMounts sets the container's mounts
 func withMounts(daemon *Daemon, daemonCfg *configStore, c *container.Container, mounts []container.Mount) coci.SpecOpts {
 	return func(ctx context.Context, _ coci.Client, _ *containers.Container, s *coci.Spec) error {
@@ -641,7 +635,7 @@ func withMounts(daemon *Daemon, daemonCfg *configStore, c *container.Container,
 					continue
 				}
 				if _, ok := userMounts[m.Destination]; !ok {
-					if !inSlice(m.Options, "ro") {
+					if !slices.Contains(m.Options, "ro") {
 						s.Mounts[i].Options = append(s.Mounts[i].Options, "ro")
 					}
 				}

daemon/oci_linux_test.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"os"
 	"path/filepath"
+	"slices"
 	"testing"
 
 	"github.com/google/go-cmp/cmp/cmpopts"
@@ -119,7 +120,7 @@ func TestIpcPrivateVsReadonly(t *testing.T) {
 		if m.Destination != "/dev/shm" {
 			continue
 		}
-		assert.Check(t, is.Equal(false, inSlice(m.Options, "ro")))
+		assert.Check(t, is.Equal(false, slices.Contains(m.Options, "ro")))
 	}
 }
 

daemon/pkg/oci/caps/utils.go

@@ -38,11 +38,6 @@ func knownCapabilities() map[string]*struct{} {
 	return knownCaps
 }
 
-// inSlice tests whether a string is contained in a slice of strings or not.
-func inSlice(slice []string, s string) bool {
-	return slices.Contains(slice, s)
-}
-
 const allCapabilities = "ALL"
 
 // NormalizeLegacyCapabilities normalizes, and validates CapAdd/CapDrop capabilities
@@ -99,20 +94,20 @@ func TweakCapabilities(basics, adds, drops []string, privileged bool) ([]string,
 	var caps []string
 
 	switch {
-	case inSlice(capAdd, allCapabilities):
+	case slices.Contains(capAdd, allCapabilities):
 		// Add all capabilities except ones on capDrop
 		for _, c := range GetAllCapabilities() {
-			if !inSlice(capDrop, c) {
+			if !slices.Contains(capDrop, c) {
 				caps = append(caps, c)
 			}
 		}
-	case inSlice(capDrop, allCapabilities):
+	case slices.Contains(capDrop, allCapabilities):
 		// "Drop" all capabilities; use what's in capAdd instead
 		caps = capAdd
 	default:
 		// First drop some capabilities
 		for _, c := range basics {
-			if !inSlice(capDrop, c) {
+			if !slices.Contains(capDrop, c) {
 				caps = append(caps, c)
 			}
 		}

daemon/pkg/oci/caps/utils_linux.go

@@ -2,6 +2,7 @@ package caps
 
 import (
 	"context"
+	"slices"
 	"sync"
 
 	ccaps "github.com/containerd/containerd/v2/pkg/cap"
@@ -27,7 +28,7 @@ func initCaps() {
 			// old (pre-detection) behavior, and prevents creating containers with
 			// no capabilities. The OCI runtime or kernel may still refuse capa-
 			// bilities that are not available, and produce an error in that case.
-			if len(curCaps) > 0 && !inSlice(curCaps, capName) {
+			if len(curCaps) > 0 && !slices.Contains(curCaps, capName) {
 				knownCaps[capName] = nil
 				continue
 			}