118 lines
2.6 KiB
Go
118 lines
2.6 KiB
Go
// Copyright (c) 2020 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 hostinfo answers questions about the host environment that Tailscale is
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// running on.
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//
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// TODO(bradfitz): move more of control/controlclient/hostinfo_* into this package.
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package hostinfo
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import (
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"io"
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"os"
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"runtime"
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"sync/atomic"
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"go4.org/mem"
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"tailscale.com/util/lineread"
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)
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// EnvType represents a known environment type.
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// The empty string, the default, means unknown.
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type EnvType string
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const (
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KNative = EnvType("kn")
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AWSLambda = EnvType("lm")
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Heroku = EnvType("hr")
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AzureAppService = EnvType("az")
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)
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var envType atomic.Value // of EnvType
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func GetEnvType() EnvType {
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if e, ok := envType.Load().(EnvType); ok {
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return e
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}
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e := getEnvType()
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envType.Store(e)
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return e
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}
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func getEnvType() EnvType {
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if inKnative() {
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return KNative
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}
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if inAWSLambda() {
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return AWSLambda
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}
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if inHerokuDyno() {
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return Heroku
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}
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if inAzureAppService() {
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return AzureAppService
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}
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return ""
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}
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// InContainer reports whether we're running in a container.
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func InContainer() bool {
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if runtime.GOOS != "linux" {
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return false
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}
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var ret bool
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lineread.File("/proc/1/cgroup", func(line []byte) error {
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if mem.Contains(mem.B(line), mem.S("/docker/")) ||
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mem.Contains(mem.B(line), mem.S("/lxc/")) {
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ret = true
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return io.EOF // arbitrary non-nil error to stop loop
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}
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return nil
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})
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lineread.File("/proc/mounts", func(line []byte) error {
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if mem.Contains(mem.B(line), mem.S("fuse.lxcfs")) {
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ret = true
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return io.EOF
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}
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return nil
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})
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return ret
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}
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func inKnative() bool {
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// https://cloud.google.com/run/docs/reference/container-contract#env-vars
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if os.Getenv("K_REVISION") != "" && os.Getenv("K_CONFIGURATION") != "" &&
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os.Getenv("K_SERVICE") != "" && os.Getenv("PORT") != "" {
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return true
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}
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return false
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}
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func inAWSLambda() bool {
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// https://docs.aws.amazon.com/lambda/latest/dg/configuration-envvars.html
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if os.Getenv("AWS_LAMBDA_FUNCTION_NAME") != "" &&
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os.Getenv("AWS_LAMBDA_FUNCTION_VERSION") != "" &&
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os.Getenv("AWS_LAMBDA_INITIALIZATION_TYPE") != "" &&
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os.Getenv("AWS_LAMBDA_RUNTIME_API") != "" {
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return true
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}
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return false
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}
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func inHerokuDyno() bool {
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// https://devcenter.heroku.com/articles/dynos#local-environment-variables
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if os.Getenv("PORT") != "" && os.Getenv("DYNO") != "" {
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return true
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}
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return false
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}
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func inAzureAppService() bool {
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if os.Getenv("APPSVC_RUN_ZIP") != "" && os.Getenv("WEBSITE_STACK") != "" &&
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os.Getenv("WEBSITE_AUTH_AUTO_AAD") != "" {
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return true
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}
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return false
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}
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