fix(config): handle unavailable config directories (#35632)

Co-authored-by: James Long <jlongster@users.noreply.github.com>

packages/core/src/fs-util.ts

@@ -60,9 +60,10 @@ export namespace FSUtil {
       })
 
       const readFileStringSafe = Effect.fn("FileSystem.readFileStringSafe")(function* (path: string) {
-        return yield* fs
+        return yield* fs.readFileString(path).pipe(
-          .readFileString(path)
+          Effect.catchReason("PlatformError", "NotFound", () => Effect.succeed(undefined)),
-          .pipe(Effect.catchReason("PlatformError", "NotFound", () => Effect.succeed(undefined)))
+          Effect.catchReason("PlatformError", "PermissionDenied", () => Effect.succeed(undefined)),
+        )
       })
 
       const isDir = Effect.fn("FileSystem.isDir")(function* (path: string) {

packages/opencode/src/config/config.ts

@@ -293,6 +293,7 @@ const layer = Layer.effect(
     })
 
     const ensureGitignore = Effect.fn("Config.ensureGitignore")(function* (dir: string) {
+      yield* fs.ensureDir(dir)
       const gitignore = path.join(dir, ".gitignore")
       const hasIgnore = yield* fs.existsSafe(gitignore)
       if (!hasIgnore) {

packages/opencode/test/config/config.test.ts

@@ -923,6 +923,31 @@ it.effect("does not try to install dependencies in read-only OPENCODE_CONFIG_DIR
   }).pipe(Effect.provide(testInstanceStoreLayer), Effect.provide(LayerNode.compile(CrossSpawnSpawner.node))),
 )
 
+it.effect("ignores an inaccessible OPENCODE_CONFIG_DIR", () =>
+  Effect.gen(function* () {
+    if (process.platform === "win32") return
+
+    const dir = yield* tmpdirScoped()
+    const configDir = path.join(dir, "inaccessible")
+    yield* FSUtil.use.ensureDir(configDir)
+    yield* FSUtil.use.chmod(configDir, 0o000)
+    yield* Effect.addFinalizer(() => FSUtil.use.chmod(configDir, 0o755).pipe(Effect.ignore))
+
+    yield* withProcessEnv("OPENCODE_CONFIG_DIR", configDir, Config.use.get().pipe(provideInstanceEffect(dir)))
+  }).pipe(Effect.provide(testInstanceStoreLayer), Effect.provide(LayerNode.compile(CrossSpawnSpawner.node))),
+)
+
+it.effect("creates a missing OPENCODE_CONFIG_DIR", () =>
+  Effect.gen(function* () {
+    const dir = yield* tmpdirScoped()
+    const configDir = path.join(dir, "configdir")
+
+    yield* withProcessEnv("OPENCODE_CONFIG_DIR", configDir, Config.use.get().pipe(provideInstanceEffect(dir)))
+
+    expect(yield* FSUtil.use.readFileString(path.join(configDir, ".gitignore"))).toContain("node_modules")
+  }).pipe(Effect.provide(testInstanceStoreLayer), Effect.provide(LayerNode.compile(CrossSpawnSpawner.node))),
+)
+
 it.effect("installs dependencies in writable OPENCODE_CONFIG_DIR", () =>
   Effect.gen(function* () {
     const dir = yield* tmpdirScoped()