Patch to return debug info from from crossplane-xfn to crossplane container

gistfile1.txt

diff --git a/cmd/xfn/run/run.go b/cmd/xfn/run/run.go
index c2699bf5..a06bc334 100644
--- a/cmd/xfn/run/run.go
+++ b/cmd/xfn/run/run.go
@@ -141,4 +141,4 @@ func networkPolicy(p string) v1alpha1.NetworkPolicy {
 	default:
 		return v1alpha1.NetworkPolicy_NETWORK_POLICY_ISOLATED
 	}
-}
+}
\ No newline at end of file
diff --git a/cmd/xfn/spark/spark.go b/cmd/xfn/spark/spark.go
index 3f315aff..53652bd2 100644
--- a/cmd/xfn/spark/spark.go
+++ b/cmd/xfn/spark/spark.go
@@ -27,6 +27,7 @@ import (
 	"path/filepath"
 	"time"
 
+	"github.com/crossplane/crossplane-runtime/pkg/logging"
 	"github.com/google/go-containerregistry/pkg/name"
 	"github.com/google/uuid"
 	runtime "github.com/opencontainers/runtime-spec/specs-go"
@@ -78,7 +79,7 @@ type Command struct {
 // Run a Composition Function inside an unprivileged user namespace. Reads a
 // protocol buffer serialized RunFunctionRequest from stdin, and writes a
 // protocol buffer serialized RunFunctionResponse to stdout.
-func (c *Command) Run() error { //nolint:gocyclo // TODO(negz): Refactor some of this out into functions, add tests.
+func (c *Command) Run(log logging.Logger) error { //nolint:gocyclo // TODO(negz): Refactor some of this out into functions, add tests.
 	pb, err := io.ReadAll(os.Stdin)
 	if err != nil {
 		return errors.Wrap(err, errReadRequest)
@@ -153,14 +154,28 @@ func (c *Command) Run() error { //nolint:gocyclo // TODO(negz): Refactor some of
 	// recommended; 'run' is more for testing. In practice though run seems to
 	// work just fine for our use case.
 
+	log.Debug("about to run: ", c.Runtime, "--root="+root, "run", "--bundle="+b.Path(), runID, "with", req.GetInput())
 	//nolint:gosec // Executing with user-supplied input is intentional.
 	cmd := exec.CommandContext(ctx, c.Runtime, "--root="+root, "run", "--bundle="+b.Path(), runID)
 	cmd.Stdin = bytes.NewReader(req.GetInput())
 
 	out, err := cmd.Output()
+	if out != nil {
+		log.Debug("output from xfn: ", out)
+	}
 	if err != nil {
+		errMsg := errRuntime + " command: " + c.Runtime + "--root=" + root + " run " + " --bundle=" + b.Path() + runID + " input: " + string(req.GetInput())
+
+		if exiterr, ok := err.(*exec.ExitError); ok {
+			errMsg += " stderr: " + string(exiterr.Stderr)
+		}
+
+		if out != nil {
+			errMsg += string(out)
+		}
+
 		_ = b.Cleanup()
-		return errors.Wrap(err, errRuntime)
+		return errors.Wrap(err, errMsg)
 	}
 	if err := b.Cleanup(); err != nil {
 		return errors.Wrap(err, errCleanupBundle)
@@ -223,4 +238,4 @@ func FromRunFunctionConfig(cfg *v1alpha1.RunFunctionConfig) spec.Option {
 
 		return nil
 	}
-}
+}
\ No newline at end of file