git file system should wait for model to be initialized

extensions/git/package.json

@@ -14,7 +14,8 @@
     "Other"
   ],
   "activationEvents": [
-    "*"
+    "*",
+    "onFileSystem:git"
   ],
   "main": "./out/main",
   "icon": "resources/icons/git.png",

extensions/git/src/fileSystemProvider.ts

@@ -133,6 +133,8 @@ export class GitFileSystemProvider implements FileSystemProvider {
 	}
 
 	async stat(uri: Uri): Promise<FileStat> {
+		await this.model.isInitialized;
+
 		const { submoduleOf, path, ref } = fromGitUri(uri);
 		const repository = submoduleOf ? this.model.getRepository(submoduleOf) : this.model.getRepository(uri);
 		if (!repository) {
@@ -158,6 +160,8 @@ export class GitFileSystemProvider implements FileSystemProvider {
 	}
 
 	async readFile(uri: Uri): Promise<Uint8Array> {
+		await this.model.isInitialized;
+
 		const { path, ref, submoduleOf } = fromGitUri(uri);
 
 		if (submoduleOf) {

extensions/git/src/model.ts

@@ -6,7 +6,7 @@
 import { workspace, WorkspaceFoldersChangeEvent, Uri, window, Event, EventEmitter, QuickPickItem, Disposable, SourceControl, SourceControlResourceGroup, TextEditor, Memento, OutputChannel, commands } from 'vscode';
 import { Repository, RepositoryState } from './repository';
 import { memoize, sequentialize, debounce } from './decorators';
-import { dispose, anyEvent, filterEvent, isDescendant, firstIndex, pathEquals, toDisposable } from './util';
+import { dispose, anyEvent, filterEvent, isDescendant, firstIndex, pathEquals, toDisposable, eventToPromise } from './util';
 import { Git } from './git';
 import * as path from 'path';
 import * as fs from 'fs';
@@ -77,6 +77,15 @@ export class Model implements IRemoteSourceProviderRegistry {
 		commands.executeCommand('setContext', 'git.state', state);
 	}
 
+	@memoize
+	get isInitialized(): Promise<void> {
+		if (this._state === 'initialized') {
+			return Promise.resolve();
+		}
+
+		return eventToPromise(filterEvent(this.onDidChangeState, s => s === 'initialized')) as Promise<any>;
+	}
+
 	private remoteSourceProviders = new Set<RemoteSourceProvider>();
 
 	private _onDidAddRemoteSourceProvider = new EventEmitter<RemoteSourceProvider>();