validate: allow non-linux compatibility

validate/validate.go

@@ -862,17 +862,6 @@ func CapValid(c string, hostSpecific bool) error {
 	return nil
 }
 
-// LastCap return last cap of system
-func LastCap() capability.Cap {
-	last := capability.CAP_LAST_CAP
-	// hack for RHEL6 which has no /proc/sys/kernel/cap_last_cap
-	if last == capability.Cap(63) {
-		last = capability.CAP_BLOCK_SUSPEND
-	}
-
-	return last
-}
-
 func envValid(env string) bool {
 	items := strings.Split(env, "=")
 	if len(items) < 2 {

validate/validate_linux.go

@@ -0,0 +1,18 @@
+// +build linux
+
+package validate
+
+import (
+	"github.com/syndtr/gocapability/capability"
+)
+
+// LastCap return last cap of system
+func LastCap() capability.Cap {
+	last := capability.CAP_LAST_CAP
+	// hack for RHEL6 which has no /proc/sys/kernel/cap_last_cap
+	if last == capability.Cap(63) {
+		last = capability.CAP_BLOCK_SUSPEND
+	}
+
+	return last
+}

validate/validate_unsupported.go

@@ -0,0 +1,12 @@
+// +build !linux
+
+package validate
+
+import (
+	"github.com/syndtr/gocapability/capability"
+)
+
+// LastCap return last cap of system
+func LastCap() capability.Cap {
+	return capability.Cap(-1)
+}