Added the git ls-files merged output to artifacts for troubleshooting #…

…3068

.buildkite/pipeline.yml

@@ -9,5 +9,6 @@ steps:
     command: ".buildkite/scripts/integration_tests.sh"
     artifact_paths:
       - "build/TEST-**"
+      - "archive-files"
     agents:
       provider: "gcp"

pkg/testing/runner/archiver.go

@@ -11,6 +11,7 @@ import (
 	"context"
 	"fmt"
 	"io"
+	"io/ioutil"
 	"os"
 	"os/exec"
 	"path/filepath"
@@ -44,6 +45,12 @@ func createRepoZipArchive(ctx context.Context, dir string, dest string) error {
 		return fmt.Errorf("failed to run git ls-files -o: exited code %d", processDone.ExitCode())
 	}
 
+	// Added for troubleshooting https://github.com/elastic/elastic-agent/issues/3068
+	err = saveFilesList(absDir, stdout)
+	if err != nil {
+		fmt.Printf("Error writing to file: %v\n", err)
+	}
+
 	archive, err := os.Create(dest)
 	if err != nil {
 		return fmt.Errorf("failed to create file %s: %w", dest, err)
@@ -111,3 +118,12 @@ func workDir(dir string) process.CmdOption {
 		return nil
 	}
 }
+
+// Added for troubleshooting https://github.com/elastic/elastic-agent/issues/3068
+func saveFilesList(dir string, stdout bytes.Buffer) error {
+	err := ioutil.WriteFile(filepath.Join(dir, "archive-files"), stdout.Bytes(), 0644)
+	if err != nil {
+		return err
+	}
+	return nil
+}