perkeep/misc/release/build-binaries.go

// +build ignore

/*
Copyright 2015 The Perkeep Authors

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.
*/

// Command build-binaries builds perkeepd and the Perkeep tools.
// It should be run in a docker container.
package main // import "perkeep.org/misc/docker/release"

import (
	"bufio"
	"flag"
	"fmt"
	"log"
	"os"
	"os/exec"
	"path"
	"runtime"
	"strings"
)

var (
	flagRev = flag.String("rev", "", "Perkeep revision to build (tag or commit hash). For development purposes, you can instead specify the path to a local Perkeep source tree from which to build, with the form \"WIP:/path/to/dir\".")
	outDir  = flag.String("outdir", "/OUT/", "Output directory, where the binaries will be written")
	buildOS = flag.String("os", runtime.GOOS, "Operating system to build for.")
)

func usage() {
	fmt.Fprintf(os.Stderr, "Usage:\n")
	fmt.Fprintf(os.Stderr, "%s --rev=perkeep_revision\n", os.Args[0])
	fmt.Fprintf(os.Stderr, "%s --rev=WIP:/path/to/perkeep/source/dir\n", os.Args[0])
	flag.PrintDefaults()
	example(os.Args[0])
	os.Exit(1)
}

func example(program string) {
	fmt.Fprintf(os.Stderr, "Examples:\n")
	fmt.Fprintf(os.Stderr, "\tdocker run --rm --volume=/tmp/camli-build/perkeep.org:/OUT perkeep/go %s --rev=4e8413c5012c\n", program)
	fmt.Fprintf(os.Stderr, "\tdocker run --rm --volume=/tmp/camli-build/perkeep.org:/OUT --volume=~/perkeep.org:/IN perkeep/go %s --rev=WIP:/IN\n", program)
}

func isWIP() bool {
	return strings.HasPrefix(*flagRev, "WIP")
}

// localCamliSource returns the path to the local Perkeep source tree
// that should be specified in *flagRev if *flagRev starts with "WIP:",
// empty string otherwise.
func localCamliSource() string {
	if !isWIP() {
		return ""
	}
	return strings.TrimPrefix(*flagRev, "WIP:")
}

func getCamliSrc() {
	if localCamliSource() != "" {
		mirrorCamliSrc(localCamliSource())
	} else {
		fetchCamliSrc()
	}
}

func mirrorCamliSrc(srcDir string) {
	check(os.MkdirAll("/gopath/src", 0777))
	cmd := exec.Command("cp", "-a", srcDir, "/gopath/src/perkeep.org")
	cmd.Stdout = os.Stdout
	cmd.Stderr = os.Stderr
	if err := cmd.Run(); err != nil {
		log.Fatalf("Error mirroring perkeep source from %v: %v", srcDir, err)
	}
}

func fetchCamliSrc() {
	check(os.MkdirAll("/gopath/src/perkeep.org", 0777))
	check(os.Chdir("/gopath/src"))

	cmd := exec.Command("git", "clone", "https://github.com/perkeep/perkeep", "perkeep.org")
	if err := cmd.Run(); err != nil {
		log.Fatal("Error cloning Perkeep")
	}

	check(os.Chdir("perkeep.org"))
	cmd = exec.Command("git", "reset", "--hard", *flagRev)
	if err := cmd.Run(); err != nil {
		log.Fatalf("Error resetting to %v", *flagRev)
	}
}

func build() {
	check(os.Chdir("/gopath/src/perkeep.org"))
	oldPath := os.Getenv("PATH")
	os.Setenv("GOPATH", "/gopath")
	os.Setenv("PATH", "/usr/local/go/bin:"+oldPath)
	check(os.Setenv("CAMLI_GOPHERJS_GOROOT", "/usr/local/go"))
	cmd := exec.Command("go", "run", "make.go", "--os", *buildOS)
	cmd.Stdout = os.Stdout
	cmd.Stderr = os.Stderr
	if err := cmd.Run(); err != nil {
		log.Fatalf("Error building all Perkeep binaries for %v in go container: %v", *buildOS, err)
	}
	srcDir := "/gopath/bin"
	if *buildOS != "linux" {
		// TODO(mpl): probably bail early if GOARCH != amd64. Or do we want to distribute for other arches?
		srcDir = path.Join(srcDir, *buildOS+"_amd64")
	}
	cmd = exec.Command("mv", srcDir, path.Join(*outDir, "/bin"))
	if err := cmd.Run(); err != nil {
		log.Fatalf("Error copying Perkeep binaries to %v: %v", path.Join(*outDir, "/bin"), err)
	}
}

func checkArgs() {
	if flag.NArg() != 0 {
		usage()
	}
	if *flagRev == "" {
		fmt.Fprintf(os.Stderr, "Usage error: --rev is required.\n")
		usage()
	}
}

func inDocker() bool {
	r, err := os.Open("/proc/self/cgroup")
	if err != nil {
		log.Fatalf(`can't open "/proc/self/cgroup": %v`, err)
	}
	defer r.Close()
	sc := bufio.NewScanner(r)
	for sc.Scan() {
		l := sc.Text()
		fields := strings.SplitN(l, ":", 3)
		if len(fields) != 3 {
			log.Fatal(`unexpected line in "/proc/self/cgroup"`)
		}
		if fields[2] == "/" {
			continue
		}
		if !strings.HasPrefix(fields[2], "/docker/") {
			return false
		}
	}
	if err := sc.Err(); err != nil {
		log.Fatal(err)
	}
	return true
}

func main() {
	flag.Usage = usage
	flag.Parse()
	if !inDocker() {
		fmt.Fprintf(os.Stderr, "Usage error: this program should be run within a docker container, and is meant to be called from misc/docker/dock.go\n")
		usage()
	}
	checkArgs()

	getCamliSrc()
	build()
}

func check(err error) {
	if err != nil {
		log.Fatal(err)
	}
}