test/e2e: Support logging an individual resources' state to stdout

Add initial support for debugging individual Kubernetes resources,
executing arbitrary shell commands, etc. This is mainly useful in the
context of debugging cluster-scoped resources (e.g. the Operator API)
that don't necessary fit into the test/e2e/collect-ci-artifacts.sh
gather script.

Signed-off-by: timflannagan <[email protected]>

Author: timflannagan

test/e2e/ctx/ctx.go

@@ -1,6 +1,7 @@
 package ctx
 
 import (
+	"bytes"
 	"fmt"
 	"os"
 	"os/exec"
@@ -127,6 +128,32 @@ func (ctx TestContext) DumpNamespaceArtifacts(namespace string) error {
 	return nil
 }
 
+func (ctx TestContext) DescribeResource(command string) error {
+	ctx.Logf("Running command %s", command)
+	stdout, stderr, err := ctx.ExecCommand(command)
+	if err != nil {
+		return fmt.Errorf("failed to run command: %s", strings.TrimSpace(stderr+err.Error()))
+	}
+	ctx.Logf("%s", strings.TrimSpace(stdout))
+	return nil
+}
+
+func (ctx TestContext) ExecCommand(command string) (string, string, error) {
+	var (
+		stdoutBuf bytes.Buffer
+		stderrBuf bytes.Buffer
+	)
+	cmd := exec.Command("bash", "-c", command)
+	cmd.Stdout = &stdoutBuf
+	cmd.Stderr = &stderrBuf
+	cmd.Env = []string{"KUBECONFIG=" + ctx.kubeconfigPath}
+
+	if err := cmd.Run(); err != nil {
+		return stdoutBuf.String(), stderrBuf.String(), err
+	}
+	return stdoutBuf.String(), stderrBuf.String(), nil
+}
+
 func setDerivedFields(ctx *TestContext) error {
 	if ctx == nil {
 		return fmt.Errorf("nil test context")