mirror of
https://github.com/tailscale/tailscale.git
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46 lines
1.0 KiB
Go
46 lines
1.0 KiB
Go
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// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Package cloudenv reports which known cloud environment we're running in.
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package cloudenv
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import (
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"sync/atomic"
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gcpmetadata "cloud.google.com/go/compute/metadata"
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)
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// GoogleMetadataAndDNSIP is the metadata IP used by Google Cloud.
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// It's also the *.internal DNS server, and proxies to 8.8.8.8.
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const GoogleMetadataAndDNSIP = "169.254.169.254"
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// Cloud is a recognize cloud environment with properties that
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// Tailscale can specialize for in places.
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type Cloud string
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const (
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GCP = Cloud("gcp") // Google Cloud
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)
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var cloudAtomic atomic.Value // of Cloud
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// Get returns the current cloud, or the empty string if unknown.
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func Get() Cloud {
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c, ok := cloudAtomic.Load().(Cloud)
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if ok {
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return c
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}
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c = getCloud()
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cloudAtomic.Store(c) // even if empty
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return c
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}
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func getCloud() Cloud {
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if gcpmetadata.OnGCE() {
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return GCP
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}
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// TODO: more, as needed.
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return ""
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}
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