fix: respect resolve.preserveSymlinks when resolving root (fix #23197) (#23198)

Co-authored-by: sapphi-red <green@sapphi.red>

Author: lazerg

packages/vite/src/node/__tests__/config.spec.ts

@@ -2037,6 +2037,28 @@ describe('loadConfigFromFile', () => {
   })
 })
 
+describe('root resolution', () => {
+  const fixtureRoot = path.resolve(
+    import.meta.dirname,
+    './fixtures/config/root-resolution',
+  )
+  const realDir = path.join(fixtureRoot, 'real')
+  const linkDir = path.join(fixtureRoot, 'link')
+
+  test('resolves a symlinked root to its real path', async () => {
+    const config = await resolveConfig({ root: linkDir }, 'serve')
+    expect(config.root).toBe(normalizePath(fs.realpathSync.native(realDir)))
+  })
+
+  test('keeps a symlinked root when resolve.preserveSymlinks is true', async () => {
+    const config = await resolveConfig(
+      { root: linkDir, resolve: { preserveSymlinks: true } },
+      'serve',
+    )
+    expect(config.root).toBe(normalizePath(linkDir))
+  })
+})
+
 describe('resolveServerOptions', () => {
   const warnFn = vi.fn()
   const logger = { warn: warnFn } as unknown as Logger

packages/vite/src/node/__tests__/fixtures/config/root-resolution/link

@@ -0,0 +1 @@
+real

packages/vite/src/node/__tests__/fixtures/config/root-resolution/real/.gitkeep

@@ -0,0 +1 @@
+

packages/vite/src/node/config.ts

@@ -1600,9 +1600,11 @@ export async function resolveConfig(
   let nonNormalizedResolvedRoot = config.root
     ? path.resolve(config.root)
     : process.cwd()
-  try {
-    nonNormalizedResolvedRoot = safeRealpathSync(nonNormalizedResolvedRoot)
-  } catch {}
+  if (!config.resolve?.preserveSymlinks) {
+    try {
+      nonNormalizedResolvedRoot = safeRealpathSync(nonNormalizedResolvedRoot)
+    } catch {}
+  }
   const resolvedRoot = normalizePath(nonNormalizedResolvedRoot)
 
   checkBadCharactersInPath(