mirror of
https://github.com/octoleo/syncthing.git
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e2febf246e
Storing assets as []byte requires every compiled-in asset to be copied into writable memory at program startup. That currently takes up 1.6MB per syncthing process. Strings stay in the RODATA section and should be shared between processes running the same binary.
122 lines
2.3 KiB
Go
122 lines
2.3 KiB
Go
// Copyright (C) 2014 The Syncthing Authors.
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//
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// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this file,
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// You can obtain one at https://mozilla.org/MPL/2.0/.
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// +build ignore
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package main
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import (
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"bytes"
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"compress/gzip"
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"flag"
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"fmt"
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"go/format"
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"io"
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"os"
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"path/filepath"
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"strconv"
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"strings"
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"text/template"
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"time"
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)
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var tpl = template.Must(template.New("assets").Parse(`// Code generated by genassets.go - DO NOT EDIT.
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package auto
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const Generated int64 = {{.Generated}}
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func Assets() map[string]string {
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var assets = make(map[string]string, {{.Assets | len}})
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{{range $asset := .Assets}}
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assets["{{$asset.Name}}"] = {{$asset.Data}}{{end}}
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return assets
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}
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`))
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type asset struct {
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Name string
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Data string
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}
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var assets []asset
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func walkerFor(basePath string) filepath.WalkFunc {
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return func(name string, info os.FileInfo, err error) error {
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if err != nil {
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return err
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}
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if strings.HasPrefix(filepath.Base(name), ".") {
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// Skip dotfiles
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return nil
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}
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if info.Mode().IsRegular() {
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fd, err := os.Open(name)
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if err != nil {
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return err
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}
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var buf bytes.Buffer
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gw := gzip.NewWriter(&buf)
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io.Copy(gw, fd)
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fd.Close()
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gw.Flush()
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gw.Close()
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name, _ = filepath.Rel(basePath, name)
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assets = append(assets, asset{
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Name: filepath.ToSlash(name),
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Data: fmt.Sprintf("%q", buf.String()),
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})
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}
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return nil
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}
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}
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type templateVars struct {
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Assets []asset
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Generated int64
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}
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func main() {
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outfile := flag.String("o", "", "Name of output file (default stdout)")
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flag.Parse()
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filepath.Walk(flag.Arg(0), walkerFor(flag.Arg(0)))
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var buf bytes.Buffer
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// Generated time is now, except if the SOURCE_DATE_EPOCH environment
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// variable is set (for reproducible builds).
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generated := time.Now().Unix()
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if s, _ := strconv.ParseInt(os.Getenv("SOURCE_DATE_EPOCH"), 10, 64); s > 0 {
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generated = s
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}
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tpl.Execute(&buf, templateVars{
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Assets: assets,
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Generated: generated,
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})
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bs, err := format.Source(buf.Bytes())
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if err != nil {
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fmt.Fprintln(os.Stderr, err)
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os.Exit(1)
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}
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out := io.Writer(os.Stdout)
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if *outfile != "" {
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out, err = os.Create(*outfile)
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if err != nil {
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fmt.Fprintln(os.Stderr, err)
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os.Exit(1)
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}
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}
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out.Write(bs)
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}
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