feat: support symbolic link git dir

lib/resolveGitRepo.js

@@ -19,6 +19,11 @@
   const stats = await fs.lstat(defaultDir)
   // If .git is a directory, use it
   if (stats.isDirectory()) return defaultDir
+  // If .git is a symbolic link, find realpath and use it,
+  // thought realpath is a directory, avoid infinite recursion.
+  if (stats.isSymbolicLink()) {
+    return fs.realpath(defaultDir);
+  }
   // Otherwise .git is a file containing path to real location
   const file = (await readFile(defaultDir)).toString()
   return path.resolve(gitDir, file.replace(/^gitdir: /, '')).trim()

test/unit/resolveGitRepo.spec.js

@@ -1,4 +1,5 @@
 import path from 'node:path'
+import fs from 'node:fs/promises'
 
 import { normalizePath } from '../../lib/normalizePath.js'
 import { determineGitDir, resolveGitRepo } from '../../lib/resolveGitRepo.js'
@@ -48,6 +49,21 @@
     expect(gitDir).toEqual(null)
   })
 
+  it('should resolve when git config dir is symbolic link', async () => {
+    const link = path.join(__dirname, '.git')
+    await fs.symlink(expected, link)
+
+    const processCwdBkp = process.cwd
+    process.cwd = () => __dirname
+
+    const { gitDir, gitConfigDir } = await resolveGitRepo()
+    expect(gitDir).toEqual(expected)
+    expect(gitConfigDir).toEqual(path.join(expected, '.git'));
+
+    await fs.unlink(link);
+    process.cwd = processCwdBkp
+  })
+
   describe('determineGitDir', () => {
     it('should resolve to current working dir when relative dir is empty', () => {
       const cwd = process.cwd()