Create timestamp file in variant analysis storage directory

extensions/ql-vscode/src/remote-queries/run-remote-query.ts

@@ -280,6 +280,8 @@ export async function runRemoteQuery(
 
       variantAnalysisManager.onVariantAnalysisSubmitted(processedVariantAnalysis);
 
+      await variantAnalysisManager.prepareStorageDirectory(processedVariantAnalysis.id);
+
       void logger.log(`Variant analysis:\n${JSON.stringify(processedVariantAnalysis, null, 2)}`);
 
       void showAndLogInformationMessage(`Variant analysis ${processedVariantAnalysis.query.name} submitted for processing`);

extensions/ql-vscode/src/remote-queries/variant-analysis-manager.ts

@@ -23,6 +23,7 @@ import { CodeQLCliServer } from '../cli';
 import { getControllerRepo } from './run-remote-query';
 import { processUpdatedVariantAnalysis } from './variant-analysis-processor';
 import PQueue from 'p-queue';
+import { createTimestampFile } from '../helpers';
 
 export class VariantAnalysisManager extends DisposableObject implements VariantAnalysisViewManager<VariantAnalysisView> {
   private readonly _onVariantAnalysisAdded = this.push(new EventEmitter<VariantAnalysis>());
@@ -180,6 +181,16 @@ export class VariantAnalysisManager extends DisposableObject implements VariantA
     return this.variantAnalysisResultsManager.getStorageDirectory(variantAnalysisId);
   }
 
+  /**
+   * Prepares a directory for storing results for a variant analysis.
+   * This directory contains a timestamp file, which will be
+   * used by the query history manager to determine when the directory
+   * should be deleted.
+   */
+  public async prepareStorageDirectory(variantAnalysisId: number): Promise<void> {
+    await createTimestampFile(this.getVariantAnalysisStorageLocation(variantAnalysisId));
+  }
+
   public async promptOpenVariantAnalysis() {
     const credentials = await Credentials.initialize(this.ctx);
     if (!credentials) { throw Error('Error authenticating with GitHub'); }