batches: File upload error handling (#1015)

* Add the filename to the error to help determine which file is erroring

* Shadow the error to prevent the error being returned later on

Author: Piszmog

cmd/src/batch_common.go

@@ -535,7 +535,7 @@ func executeBatchSpec(ctx context.Context, opts executeBatchSpecOpts) (err error
 	}
 	if hasWorkspaceFiles {
 		execUI.UploadingWorkspaceFiles()
-		if err = svc.UploadBatchSpecWorkspaceFiles(ctx, batchSpecDir, string(id), batchSpec.Steps); err != nil {
+		if err := svc.UploadBatchSpecWorkspaceFiles(ctx, batchSpecDir, string(id), batchSpec.Steps); err != nil {
 			// Since failing to upload workspace files should not stop processing, just warn
 			execUI.UploadingWorkspaceFilesWarning(errors.Wrap(err, "uploading workspace files"))
 		} else {

internal/batches/service/remote.go

@@ -213,7 +213,7 @@ func createFormFile(w *multipart.Writer, workingDir string, mountPath string) er
 		return err
 	}
 	if fileStat.Size() > maxFileSize {
-		return errors.New("file exceeds limit of 10MB")
+		return errors.Newf("file %q exceeds limit of 10MB", mountPath)
 	}
 
 	filePath, fileName := filepath.Split(mountPath)