implement read ifd from file

test/e2e/pkg/infrastructure.go

@@ -1,8 +1,10 @@
 package e2e
 
 import (
+	"encoding/json"
 	"fmt"
 	"net"
+	"os"
 )
 
 // InfrastructureData contains the relevant information for a set of existing
@@ -42,3 +44,13 @@ func NewDockerInfrastructureData(m Manifest) (InfrastructureData, error) {
 	}
 	return ifd, nil
 }
+
+func InfrastructureDataFromFile(p string) (InfrastructureData, error) {
+	ifd := InfrastructureData{}
+	b, err := os.ReadFile(p)
+	err = json.Unmarshal(b, &ifd)
+	if err != nil {
+		return InfrastructureData{}, err
+	}
+	return ifd, nil
+}

test/e2e/runner/main.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"context"
+	"errors"
 	"fmt"
 	"math/rand"
 	"os"
@@ -59,6 +60,15 @@ func NewCLI() *CLI {
 				if err != nil {
 					return err
 				}
+			case "digital-ocean":
+				p, err := cmd.Flags().GetString("infrastructure-data")
+				if err != nil {
+					return err
+				}
+				if p == "" {
+					return errors.New("'--infrastructure-data' must be set when using the 'digital-ocean' infrastructure-type")
+				}
+				ifd, err = e2e.InfrastructureDataFromFile(p)
 			// TODO(williambanfield): add a section that implements the 'digital-ocean' infrastructure-type
 			default:
 				return fmt.Errorf("unknown infrastructure type '%s'", t)