refactor: change package names

hcloudimages/backoff/backoff.go

@@ -0,0 +1,28 @@
+package backoff
+
+import (
+	"math"
+	"time"
+
+	"github.com/hetznercloud/hcloud-go/v2/hcloud"
+)
+
+// From https://github.com/hetznercloud/terraform-provider-hcloud/blob/v1.46.1/internal/control/retry.go
+// Copyright (c) Hetzner Cloud GmbH
+
+// ExponentialBackoffWithLimit returns a [hcloud.BackoffFunc] which implements an exponential
+// backoff.
+// It uses the formula:
+//
+//	min(b^retries * d, limit)
+func ExponentialBackoffWithLimit(b float64, d time.Duration, limit time.Duration) hcloud.BackoffFunc {
+	return func(retries int) time.Duration {
+		current := time.Duration(math.Pow(b, float64(retries))) * d
+
+		if current > limit {
+			return limit
+		} else {
+			return current
+		}
+	}
+}