Add more stdio checks when spawning git processes.

extensions/git/src/git.ts

@@ -1924,7 +1924,15 @@ export class Repository {
 	async stage(path: string, data: Uint8Array): Promise<void> {
 		const relativePath = this.sanitizeRelativePath(path);
 		const child = this.stream(['hash-object', '--stdin', '-w', '--path', relativePath], { stdio: [null, null, null] });
-		child.stdin!.end(data);
+
+		if (!child.stdin) {
+			throw new GitError({
+				message: 'Failed to spawn git process',
+				exitCode: -1
+			});
+		}
+
+		child.stdin.end(data);
 
 		const { exitCode, stdout } = await exec(child);
 		const hash = stdout.toString('utf8');

extensions/git/src/repository.ts

@@ -2347,7 +2347,15 @@ export class Repository implements Disposable {
 
 				// https://git-scm.com/docs/git-check-ignore#git-check-ignore--z
 				const child = this.repository.stream(['check-ignore', '-v', '-z', '--stdin'], { stdio: [null, null, null] });
-				child.stdin!.end(filePaths.join('\0'), 'utf8');
+
+				if (!child.stdin) {
+					return reject(new GitError({
+						message: 'Failed to spawn git process',
+						exitCode: -1
+					}));
+				}
+
+				child.stdin.end(filePaths.join('\0'), 'utf8');
 
 				const onExit = (exitCode: number) => {
 					if (exitCode === 1) {
@@ -2369,12 +2377,16 @@ export class Repository implements Disposable {
 					data += raw;
 				};
 
-				child.stdout!.setEncoding('utf8');
-				child.stdout!.on('data', onStdoutData);
+				if (child.stdout) {
+					child.stdout.setEncoding('utf8');
+					child.stdout.on('data', onStdoutData);
+				}
 
 				let stderr: string = '';
-				child.stderr!.setEncoding('utf8');
-				child.stderr!.on('data', raw => stderr += raw);
+				if (child.stderr) {
+					child.stderr.setEncoding('utf8');
+					child.stderr.on('data', raw => stderr += raw);
+				}
 
 				child.on('error', reject);
 				child.on('exit', onExit);