.drone.yml

@@ -0,0 +1,17 @@
+---
+kind: pipeline
+name: compliance
+trigger:
+  event:
+    - pull_request
+steps:
+  - name: build
+    pull: always
+    image: golang:1.16
+    commands:
+      - make test
+  - name: check
+    pull: always
+    image: golang:1.16
+    commands:
+      - make vet

.woodpecker.yml

@@ -1,8 +0,0 @@
-pipeline:
-  compliance:
-    image: golang:1.17
-    commands:
-      - go test -race ./...
-      - go vet ./...
-    when:
-      event: [ pull_request ]

Makefile

@@ -0,0 +1,17 @@
+GO ?= go
+
+.PHONY: vet
+vet:
+	$(GO) vet ./...
+
+.PHONY: fmt
+fmt:
+	$(GO) fmt ./...
+
+.PHONY: test
+test:
+	$(GO) test -race ./...
+
+.PHONY: bench
+bench:
+	$(GO) test -benchmem -bench=.

bench.txt

@@ -0,0 +1,9 @@
+go test -benchmem -bench=.
+goos: linux
+goarch: amd64
+pkg: go.jolheiser.com/overlay
+cpu: Intel(R) Core(TM) i7-4700MQ CPU @ 2.40GHz
+BenchmarkCache-8     	134959974	         9.003 ns/op	       0 B/op	       0 allocs/op
+BenchmarkNoCache-8   	  897212	      1369 ns/op	     280 B/op	       4 allocs/op
+PASS
+ok  	go.jolheiser.com/overlay	3.360s

overlay.go

@@ -18,17 +18,12 @@ type FS struct {
 	cache   map[string]bool
 }
 
-// PurgeCache purges the cache
-func (f *FS) PurgeCache() {
-	f.cache = make(map[string]bool)
-}
-
 func (f *FS) apn(name string) string {
 	return path.Join(f.root, name)
 }
 
 func (f *FS) exists(name string) bool {
-	if has, ok := f.cache[name]; ok {
+	if has, ok := f.cache[name]; ok && f.doCache {
 		return has
 	}
 	_, err := os.Stat(f.apn(name))
@@ -68,9 +63,10 @@ type Option func(*FS) error
 // New returns a new FS
 func New(root string, fs fs.FS, opts ...Option) (*FS, error) {
 	x := &FS{
-		fs:    fs,
+		fs:      fs,
-		root:  root,
+		root:    root,
-		cache: make(map[string]bool),
+		doCache: true,
+		cache:   make(map[string]bool),
 	}
 
 	for _, opt := range opts {