c213fd1fd8
There is no need to depend on the old context package now that the minimum Go version is 1.7. The move to "context" eliminates our weird vendoring setup. Some vendored code still uses golang.org/x/net/context and it is now vendored in the normal way. This change triggered new vet checks around context.WithTimeout which didn't fire with golang.org/x/net/context.
139 lines
3.7 KiB
Go
139 lines
3.7 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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if os.Getenv("GOPATH") == "" {
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log.Fatal("GOPATH is not set")
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}
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return os.Getenv("GOPATH")
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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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var warnedAboutGit bool
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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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if !warnedAboutGit {
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log.Println("Warning: can't find 'git' in PATH")
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warnedAboutGit = true
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}
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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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