143 lines
4.0 KiB
Go
143 lines
4.0 KiB
Go
// Copyright 2016 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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"flag"
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"fmt"
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"io"
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"io/ioutil"
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"log"
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"os"
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"os/exec"
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"path/filepath"
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"strings"
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"text/template"
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)
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var DryRunFlag = flag.Bool("n", false, "dry run, don't execute commands")
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// MustRun executes the given command and exits the host process for
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// any error.
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func MustRun(cmd *exec.Cmd) {
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fmt.Println(">>>", strings.Join(cmd.Args, " "))
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if !*DryRunFlag {
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cmd.Stderr = os.Stderr
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cmd.Stdout = os.Stdout
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if err := cmd.Run(); err != nil {
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log.Fatal(err)
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}
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}
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}
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func MustRunCommand(cmd string, args ...string) {
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MustRun(exec.Command(cmd, args...))
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}
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// GOPATH returns the value that the GOPATH environment
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// variable should be set to.
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func GOPATH() string {
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path := filepath.SplitList(os.Getenv("GOPATH"))
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if len(path) == 0 {
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log.Fatal("GOPATH is not set")
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}
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// Ensure that our internal vendor folder in on GOPATH
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vendor, _ := filepath.Abs(filepath.Join("build", "_vendor"))
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for _, dir := range path {
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if dir == vendor {
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return strings.Join(path, string(filepath.ListSeparator))
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}
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}
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newpath := append(path[:1], append([]string{vendor}, path[1:]...)...)
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return strings.Join(newpath, string(filepath.ListSeparator))
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}
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// VERSION returns the content of the VERSION file.
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func VERSION() string {
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version, err := ioutil.ReadFile("VERSION")
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if err != nil {
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log.Fatal(err)
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}
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return string(bytes.TrimSpace(version))
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}
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// RunGit runs a git subcommand and returns its output.
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// The command must complete successfully.
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func RunGit(args ...string) string {
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cmd := exec.Command("git", args...)
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var stdout, stderr bytes.Buffer
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cmd.Stdout, cmd.Stderr = &stdout, &stderr
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if err := cmd.Run(); err == exec.ErrNotFound {
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log.Println("no git in PATH")
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return ""
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} else if err != nil {
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log.Fatal(strings.Join(cmd.Args, " "), ": ", err, "\n", stderr.String())
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}
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return strings.TrimSpace(stdout.String())
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}
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// Render renders the given template file into outputFile.
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func Render(templateFile, outputFile string, outputPerm os.FileMode, x interface{}) {
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tpl := template.Must(template.ParseFiles(templateFile))
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render(tpl, outputFile, outputPerm, x)
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}
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// RenderString renders the given template string into outputFile.
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func RenderString(templateContent, outputFile string, outputPerm os.FileMode, x interface{}) {
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tpl := template.Must(template.New("").Parse(templateContent))
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render(tpl, outputFile, outputPerm, x)
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}
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func render(tpl *template.Template, outputFile string, outputPerm os.FileMode, x interface{}) {
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if err := os.MkdirAll(filepath.Dir(outputFile), 0755); err != nil {
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log.Fatal(err)
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}
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out, err := os.OpenFile(outputFile, os.O_CREATE|os.O_WRONLY|os.O_EXCL, outputPerm)
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if err != nil {
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log.Fatal(err)
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}
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if err := tpl.Execute(out, x); err != nil {
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log.Fatal(err)
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}
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if err := out.Close(); err != nil {
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log.Fatal(err)
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}
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}
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// CopyFile copies a file.
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func CopyFile(dst, src string, mode os.FileMode) {
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if err := os.MkdirAll(filepath.Dir(dst), 0755); err != nil {
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log.Fatal(err)
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}
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destFile, err := os.OpenFile(dst, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, mode)
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if err != nil {
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log.Fatal(err)
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}
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defer destFile.Close()
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srcFile, err := os.Open(src)
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if err != nil {
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log.Fatal(err)
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}
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defer srcFile.Close()
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if _, err := io.Copy(destFile, srcFile); err != nil {
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log.Fatal(err)
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}
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}
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