cmd/cli: use slices.Contains

cmd/cli/os_linux.go

@@ -9,6 +9,7 @@ import (
 	"net"
 	"net/netip"
 	"os/exec"
+	"slices"
 	"strings"
 	"syscall"
 	"time"
@@ -285,8 +286,7 @@ func ignoringEINTR(fn func() error) error {
 func isSubSet(s1, s2 []string) bool {
 	ok := true
 	for _, ns := range s1 {
-		// TODO(cuonglm): use slices.Contains once upgrading to go1.21
-		if sliceContains(s2, ns) {
+		if slices.Contains(s2, ns) {
 			continue
 		}
 		ok = false
@@ -294,19 +294,3 @@ func isSubSet(s1, s2 []string) bool {
 	}
 	return ok
 }
-
-// sliceContains reports whether v is present in s.
-func sliceContains[S ~[]E, E comparable](s S, v E) bool {
-	return sliceIndex(s, v) >= 0
-}
-
-// sliceIndex returns the index of the first occurrence of v in s,
-// or -1 if not present.
-func sliceIndex[S ~[]E, E comparable](s S, v E) int {
-	for i := range s {
-		if v == s[i] {
-			return i
-		}
-	}
-	return -1
-}