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// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package tailscaleroot
import (
"fmt"
"os"
"regexp"
"strings"
"testing"
)
func TestDockerfileVersion(t *testing.T) {
goMod, err := os.ReadFile("go.mod")
if err != nil {
t.Fatal(err)
}
m := regexp.MustCompile(`(?m)^go (\d\.\d+)\r?$`).FindStringSubmatch(string(goMod))
if m == nil {
t.Fatalf("didn't find go version in go.mod")
}
goVersion := m[1]
dockerFile, err := os.ReadFile("Dockerfile")
if err != nil {
t.Fatal(err)
}
wantSub := fmt.Sprintf("FROM golang:%s-alpine AS build-env", goVersion)
if !strings.Contains(string(dockerFile), wantSub) {
t.Errorf("didn't find %q in Dockerfile", wantSub)
}
}
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