Initial

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alexellis2@gmail.com>

vendor/github.com/Microsoft/hcsshim/internal/hns/hnssupport.go

@@ -0,0 +1,49 @@
+package hns
+
+import (
+	"github.com/sirupsen/logrus"
+)
+
+type HNSSupportedFeatures struct {
+	Acl HNSAclFeatures `json:"ACL"`
+}
+
+type HNSAclFeatures struct {
+	AclAddressLists       bool `json:"AclAddressLists"`
+	AclNoHostRulePriority bool `json:"AclHostRulePriority"`
+	AclPortRanges         bool `json:"AclPortRanges"`
+	AclRuleId             bool `json:"AclRuleId"`
+}
+
+func GetHNSSupportedFeatures() HNSSupportedFeatures {
+	var hnsFeatures HNSSupportedFeatures
+
+	globals, err := GetHNSGlobals()
+	if err != nil {
+		// Expected on pre-1803 builds, all features will be false/unsupported
+		logrus.Debugf("Unable to obtain HNS globals: %s", err)
+		return hnsFeatures
+	}
+
+	hnsFeatures.Acl = HNSAclFeatures{
+		AclAddressLists:       isHNSFeatureSupported(globals.Version, HNSVersion1803),
+		AclNoHostRulePriority: isHNSFeatureSupported(globals.Version, HNSVersion1803),
+		AclPortRanges:         isHNSFeatureSupported(globals.Version, HNSVersion1803),
+		AclRuleId:             isHNSFeatureSupported(globals.Version, HNSVersion1803),
+	}
+
+	return hnsFeatures
+}
+
+func isHNSFeatureSupported(currentVersion HNSVersion, minVersionSupported HNSVersion) bool {
+	if currentVersion.Major < minVersionSupported.Major {
+		return false
+	}
+	if currentVersion.Major > minVersionSupported.Major {
+		return true
+	}
+	if currentVersion.Minor < minVersionSupported.Minor {
+		return false
+	}
+	return true
+}