82 lines
2.8 KiB
Go
82 lines
2.8 KiB
Go
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// Copyright 2019 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package build
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import (
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"bytes"
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"crypto/sha256"
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"fmt"
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"io/ioutil"
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"net/http"
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"os"
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"path/filepath"
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"strings"
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)
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// EnsureGoSources ensures that path contains a file with the given SHA256 hash,
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// and if not, it downloads a fresh Go source package from upstream and replaces
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// path with it (if the hash matches).
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func EnsureGoSources(version string, hash []byte, path string) error {
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// Sanity check the destination path to ensure we don't do weird things
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if !strings.HasSuffix(path, ".tar.gz") {
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return fmt.Errorf("destination path (%s) must end with .tar.gz", path)
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}
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// If the file exists, validate it's hash
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if archive, err := ioutil.ReadFile(path); err == nil { // Go sources are ~20MB, it's fine to read all
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hasher := sha256.New()
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hasher.Write(archive)
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have := hasher.Sum(nil)
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if bytes.Equal(have, hash) {
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fmt.Printf("Go %s [%x] available at %s\n", version, hash, path)
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return nil
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}
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fmt.Printf("Go %s hash mismatch (have %x, want %x) at %s, deleting old archive\n", version, have, hash, path)
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if err := os.Remove(path); err != nil {
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return err
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}
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}
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// Archive missing or bad hash, download a new one
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fmt.Printf("Downloading Go %s [want %x] into %s\n", version, hash, path)
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res, err := http.Get(fmt.Sprintf("https://dl.google.com/go/go%s.src.tar.gz", version))
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if err != nil || res.StatusCode != http.StatusOK {
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return fmt.Errorf("failed to access Go sources: code %d, err %v", res.StatusCode, err)
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}
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defer res.Body.Close()
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archive, err := ioutil.ReadAll(res.Body)
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if err != nil {
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return err
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}
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// Sanity check the downloaded archive, save if checks out
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hasher := sha256.New()
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hasher.Write(archive)
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if have := hasher.Sum(nil); !bytes.Equal(have, hash) {
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return fmt.Errorf("downloaded Go %s hash mismatch (have %x, want %x)", version, have, hash)
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}
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if err := os.MkdirAll(filepath.Dir(path), 0755); err != nil {
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return err
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}
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if err := ioutil.WriteFile(path, archive, 0644); err != nil {
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return err
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}
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fmt.Printf("Downloaded Go %s [%x] into %s\n", version, hash, path)
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return nil
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}
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