Add version check to new feature

Co-authored by: Marc Jaramillo mnj.webdeveloper@gmail.com
Co-authored by: Musab Guma'a mgsium@github.com

Author: marcnjaramillo

extensions/ql-vscode/src/cli.ts

@@ -1083,6 +1083,11 @@ export class CliVersionConstraint {
    */
   public static CLI_VERSION_WITH_ALLOW_LIBRARY_PACKS_IN_RESOLVE_QUERIES = new SemVer('2.6.1');
 
+  /**
+   * CLI version where the `database unbundle` subcommand was introduced.
+   */
+  public static CLI_VERSION_WITH_DATABASE_UNBUNDLE = new SemVer('2.6.4');
+
   constructor(private readonly cli: CodeQLCliServer) {
     /**/
   }
@@ -1114,4 +1119,9 @@ export class CliVersionConstraint {
   async supportsDatabaseRegistration() {
     return this.isVersionAtLeast(CliVersionConstraint.CLI_VERSION_WITH_DB_REGISTRATION);
   }
+
+  async supportsDatabaseUnbundle() {
+    return this.isVersionAtLeast(CliVersionConstraint.CLI_VERSION_WITH_DATABASE_UNBUNDLE);
+  }
+
 }

extensions/ql-vscode/src/databaseFetcher.ts

@@ -1,12 +1,13 @@
 import fetch, { Response } from 'node-fetch';
 import { zip } from 'zip-a-folder';
+import * as unzipper from 'unzipper';
 import {
   Uri,
   CancellationToken,
   commands,
   window,
 } from 'vscode';
-import {CodeQLCliServer} from './cli';
+import { CodeQLCliServer } from './cli';
 import * as fs from 'fs-extra';
 import * as path from 'path';
 
@@ -267,10 +268,16 @@ async function readAndUnzip(
     step: 9,
     message: `Unzipping into ${path.basename(unzipPath)}`
   });
-  // Must get the zip central directory since streaming the
-  // zip contents may not have correct local file headers.
-  // Instead, we can only rely on the central directory.
-  await cli.databaseUnbundle(zipFile, unzipPath);
+  if(cli.cliConstraints.supportsDatabaseUnbundle()) {
+    // Use the `database unbundle` command if the installed cli version supports it
+    await cli.databaseUnbundle(zipFile, unzipPath);
+  } else {
+    // Must get the zip central directory since streaming the
+    // zip contents may not have correct local file headers.
+    // Instead, we can only rely on the central directory.
+    const directory = await unzipper.Open.file(zipFile);
+    await directory.extract({ path: unzipPath });
+  }
 }
 
 async function fetchAndUnzip(