validate: add network host-specific check

Signed-off-by: Ma Shimiao <[email protected]>

Author: Ma Shimiao

cmd/ocitools/validate.go

@@ -6,6 +6,7 @@ import (
 	"errors"
 	"fmt"
 	"io/ioutil"
+	"net"
 	"os"
 	"path"
 	"path/filepath"
@@ -397,6 +398,26 @@ func checkLinuxResources(r rspec.Resources, hostCheck bool) (msgs []string) {
 			msgs = append(msgs, fmt.Sprintf("Minimum memory limit should be larger than memory reservation"))
 		}
 	}
+	if r.Network != nil && hostCheck {
+		var exist bool
+		interfaces, err := net.Interfaces()
+		if err != nil {
+			msgs = append(msgs, err.Error())
+			return
+		}
+		for _, prio := range r.Network.Priorities {
+			exist = false
+			for _, ni := range interfaces {
+				if prio.Name == ni.Name {
+					exist = true
+					break
+				}
+			}
+			if !exist {
+				msgs = append(msgs, fmt.Sprintf("Interface %s does not exist on host", prio.Name))
+			}
+		}
+	}
 
 	return
 }