kubetest2-kops: get KOPS_BASE_URL in non-periodic jobs

Otherwise we're not using the version we just built

tests/e2e/kubetest2-kops/builder/build.go

@@ -18,7 +18,10 @@ package builder
 
 import (
 	"fmt"
+	"io/ioutil"
 	"os"
+	"path/filepath"
+	"strings"
 
 	"sigs.k8s.io/kubetest2/pkg/exec"
 )
@@ -39,5 +42,21 @@ func (b *BuildOptions) Build() error {
 	)
 	cmd.SetDir(b.KopsRoot)
 	exec.InheritOutput(cmd)
-	return cmd.Run()
+	if err := cmd.Run(); err != nil {
+		return err
+	}
+
+	// Write some meta files so that other tooling can know e.g. KOPS_BASE_URL
+	metaDir := filepath.Join(b.KopsRoot, ".kubetest2")
+
+	if err := os.MkdirAll(metaDir, 0755); err != nil {
+		return fmt.Errorf("failed to Mkdir(%q): %w", metaDir, err)
+	}
+	p := filepath.Join(metaDir, "kops-base-url")
+	kopsBaseURL := strings.Replace(b.StageLocation, "gs://", "https://storage.googleapis.com/", 1)
+	if err := ioutil.WriteFile(p, []byte(kopsBaseURL), 0644); err != nil {
+		return fmt.Errorf("failed to WriteFile(%q): %w", p, err)
+	}
+
+	return nil
 }

tests/e2e/scenarios/lib/common.sh

@@ -108,6 +108,9 @@ function kops-acquire-latest() {
          fi
          $KUBETEST2 --build
          KOPS="${REPO_ROOT}/.bazelbuild/dist/linux/amd64/kops"
+         KOPS_BASE_URL=$(cat "${REPO_ROOT}/.kubetest2/kops-base-url")
+         export KOPS_BASE_URL
+         echo "KOPS_BASE_URL=$KOPS_BASE_URL"
     fi
 }