fix(windows): resolve symlinked config paths for plugin detection (fixes #2271)

src/cli/doctor/checks/system-loaded-version.test.ts

@@ -1,5 +1,5 @@
 import { afterEach, describe, expect, it } from "bun:test"
-import { mkdirSync, mkdtempSync, rmSync, writeFileSync } from "node:fs"
+import { mkdirSync, mkdtempSync, realpathSync, rmSync, symlinkSync, writeFileSync } from "node:fs"
 import { tmpdir } from "node:os"
 import { dirname, join } from "node:path"
 
@@ -104,6 +104,31 @@ describe("system loaded version", () => {
       expect(loadedVersion.expectedVersion).toBe("2.3.4")
       expect(loadedVersion.loadedVersion).toBe("2.3.4")
     })
+
+    it("resolves symlinked config directories before selecting install path", () => {
+      //#given
+      const realConfigDir = createTemporaryDirectory("omo-real-config-")
+      const symlinkBaseDir = createTemporaryDirectory("omo-symlink-base-")
+      const symlinkConfigDir = join(symlinkBaseDir, "config-link")
+
+      symlinkSync(realConfigDir, symlinkConfigDir, process.platform === "win32" ? "junction" : "dir")
+      process.env.OPENCODE_CONFIG_DIR = symlinkConfigDir
+
+      writeJson(join(realConfigDir, "package.json"), {
+        dependencies: { [PACKAGE_NAME]: "4.5.6" },
+      })
+      writeJson(join(realConfigDir, "node_modules", PACKAGE_NAME, "package.json"), {
+        version: "4.5.6",
+      })
+
+      //#when
+      const loadedVersion = getLoadedPluginVersion()
+
+      //#then
+      expect(loadedVersion.cacheDir).toBe(realpathSync(symlinkConfigDir))
+      expect(loadedVersion.expectedVersion).toBe("4.5.6")
+      expect(loadedVersion.loadedVersion).toBe("4.5.6")
+    })
   })
 
   describe("getSuggestedInstallTag", () => {

src/cli/doctor/checks/system-loaded-version.ts

@@ -1,4 +1,4 @@
-import { existsSync, readFileSync } from "node:fs"
+import { existsSync, readFileSync, realpathSync } from "node:fs"
 import { homedir } from "node:os"
 import { join } from "node:path"
 
@@ -36,6 +36,16 @@ function resolveOpenCodeCacheDir(): string {
   return platformDefault
 }
 
+function resolveExistingDir(dirPath: string): string {
+  if (!existsSync(dirPath)) return dirPath
+
+  try {
+    return realpathSync(dirPath)
+  } catch {
+    return dirPath
+  }
+}
+
 function readPackageJson(filePath: string): PackageJsonShape | null {
   if (!existsSync(filePath)) return null
 
@@ -55,12 +65,13 @@ function normalizeVersion(value: string | undefined): string | null {
 
 export function getLoadedPluginVersion(): LoadedVersionInfo {
   const configPaths = getOpenCodeConfigPaths({ binary: "opencode" })
-  const cacheDir = resolveOpenCodeCacheDir()
+  const configDir = resolveExistingDir(configPaths.configDir)
+  const cacheDir = resolveExistingDir(resolveOpenCodeCacheDir())
   const candidates = [
     {
-      cacheDir: configPaths.configDir,
-      cachePackagePath: configPaths.packageJson,
-      installedPackagePath: join(configPaths.configDir, "node_modules", PACKAGE_NAME, "package.json"),
+      cacheDir: configDir,
+      cachePackagePath: join(configDir, "package.json"),
+      installedPackagePath: join(configDir, "node_modules", PACKAGE_NAME, "package.json"),
     },
     {
       cacheDir,