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https://github.com/tailscale/tailscale.git
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e28bc49e5f
With netns handling localhost now, existing tests no longer need special handling. The tests set up their connections to localhost, and the connections work without fuss. Remove the special handling for tests. Also remove the hostinfo.TestCase support, since this was the only use of it. It can be added back later if really needed, but it would be better to try to make tests work without special cases. Signed-off-by: Denton Gentry <dgentry@tailscale.com>
129 lines
2.8 KiB
Go
129 lines
2.8 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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AWSFargate = EnvType("fg")
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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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if inAWSFargate() {
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return AWSFargate
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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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func inAWSFargate() bool {
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if os.Getenv("AWS_EXECUTION_ENV") == "AWS_ECS_FARGATE" {
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return true
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}
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return false
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}
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