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// Copyright 2021 The Bazel Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package main
import (
"encoding/json"
"errors"
"fmt"
"io"
"net/http"
"sort"
"golang.org/x/mod/semver"
)
func genBoilerplate(version, shasum, goVersion string) string {
return fmt.Sprintf(`load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
http_archive(
name = "io_bazel_rules_go",
sha256 = "%[2]s",
urls = [
"https://mirror.bazel.build/github.com/bazelbuild/rules_go/releases/download/%[1]s/rules_go-%[1]s.zip",
"https://github.com/bazelbuild/rules_go/releases/download/%[1]s/rules_go-%[1]s.zip",
],
)
load("@io_bazel_rules_go//go:deps.bzl", "go_register_toolchains", "go_rules_dependencies")
go_rules_dependencies()
go_register_toolchains(version = "%[3]s")`, version, shasum, goVersion)
}
func findLatestGoVersion() (v string, err error) {
defer func() {
if err != nil {
err = fmt.Errorf("finding latest go version: %w", err)
}
}()
resp, err := http.Get("https://golang.org/dl/?mode=json")
if err != nil {
return "", err
}
defer resp.Body.Close()
data, err := io.ReadAll(resp.Body)
if err != nil {
return "", err
}
type version struct {
Version string
}
var versions []version
if err := json.Unmarshal(data, &versions); err != nil {
return "", err
}
if len(versions) == 0 {
return "", errors.New("no versions found")
}
sort.Slice(versions, func(i, j int) bool {
vi := "v" + versions[i].Version[len("go"):]
vj := "v" + versions[j].Version[len("go"):]
return semver.Compare(vi, vj) > 0
})
return versions[0].Version[len("go"):], nil
}
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