Fixes #91548 - git 2.25+ network drive issue

On Git 2.25+ if you call rev-parse --show-toplevel on a mapped drive, instead of getting the mapped drive path back, you get the UNC path for the mapped drive.

So we will try to normalize it back to the mapped drive path if possible

extensions/git/src/git.ts

@@ -18,9 +18,11 @@ import { detectEncoding } from './encoding';
 import { Ref, RefType, Branch, Remote, GitErrorCodes, LogOptions, Change, Status, CommitOptions } from './api/git';
 import * as byline from 'byline';
 import { StringDecoder } from 'string_decoder';
+import { promisify } from 'util';
 
 // https://github.com/microsoft/vscode/issues/65693
 const MAX_CLI_LENGTH = 30000;
+const isWindows = process.platform === 'win32';
 
 export interface IGit {
 	path: string;
@@ -419,8 +421,37 @@ export class Git {
 
 	async getRepositoryRoot(repositoryPath: string): Promise<string> {
 		const result = await this.exec(repositoryPath, ['rev-parse', '--show-toplevel']);
+
 		// Keep trailing spaces which are part of the directory name
-		return path.normalize(result.stdout.trimLeft().replace(/(\r\n|\r|\n)+$/, ''));
+		const repoPath = path.normalize(result.stdout.trimLeft().replace(/(\r\n|\r|\n)+$/, ''));
+
+		if (isWindows) {
+			// On Git 2.25+ if you call `rev-parse --show-toplevel` on a mapped drive, instead of getting the mapped drive path back, you get the UNC path for the mapped drive.
+			// So we will try to normalize it back to the mapped drive path, if possible
+			const repoUri = Uri.file(repoPath);
+			const pathUri = Uri.file(repositoryPath);
+			if (repoUri.authority.length !== 0 && pathUri.authority.length === 0) {
+				let match = /(?<=^\/?)([a-zA-Z])(?=:\/)/.exec(pathUri.path);
+				if (match !== null) {
+					const [, letter] = match;
+
+					try {
+						const result = await promisify(cp.exec)(`wmic logicaldisk where 'drivetype=4 and deviceid="${letter}:"' get deviceid,providername`);
+						match = /([A-Z]):\s+(.*?)\s*$/m.exec(result?.stdout.toString() ?? '');
+						if (match !== null) {
+							const [, , networkPath] = match;
+							return path.normalize(
+								repoUri.fsPath.replace(networkPath, `${letter.toLowerCase()}:`),
+							);
+						}
+					} catch { }
+				}
+
+				return path.normalize(pathUri.fsPath);
+			}
+		}
+
+		return repoPath;
 	}
 
 	async getRepositoryDotGit(repositoryPath: string): Promise<string> {