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// Copyright 2010 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Experimental Go package installer; see doc.go.
package main
import (
"bytes"
"exec"
"flag"
"fmt"
"io"
"os"
"path"
"strings"
)
func usage() {
fmt.Fprint(os.Stderr, "usage: goinstall importpath...\n")
flag.PrintDefaults()
os.Exit(2)
}
var (
argv0 = os.Args[0]
errors = false
gobin = os.Getenv("GOBIN")
parents = make(map[string]string)
root = os.Getenv("GOROOT")
visit = make(map[string]status)
reportToDashboard = flag.Bool("dashboard", true, "report public packages at "+dashboardURL)
update = flag.Bool("u", false, "update already-downloaded packages")
verbose = flag.Bool("v", false, "verbose")
)
type status int // status for visited map
const (
unvisited status = iota
visiting
done
)
func main() {
flag.Usage = usage
flag.Parse()
if root == "" {
fmt.Fprintf(os.Stderr, "%s: no $GOROOT\n", argv0)
os.Exit(1)
}
root += "/src/pkg/"
if gobin == "" {
gobin = os.Getenv("HOME") + "/bin"
}
// special case - "unsafe" is already installed
visit["unsafe"] = done
// install command line arguments
args := flag.Args()
if len(args) == 0 {
usage()
}
for _, path := range args {
install(path, "")
}
if errors {
os.Exit(1)
}
}
// printDeps prints the dependency path that leads to pkg.
func printDeps(pkg string) {
if pkg == "" {
return
}
if visit[pkg] != done {
printDeps(parents[pkg])
}
fmt.Fprintf(os.Stderr, "\t%s ->\n", pkg)
}
// install installs the package named by path, which is needed by parent.
func install(pkg, parent string) {
// Make sure we're not already trying to install pkg.
switch visit[pkg] {
case done:
return
case visiting:
fmt.Fprintf(os.Stderr, "%s: package dependency cycle\n", argv0)
printDeps(parent)
fmt.Fprintf(os.Stderr, "\t%s\n", pkg)
os.Exit(2)
}
visit[pkg] = visiting
parents[pkg] = parent
if *verbose {
fmt.Println(pkg)
}
// Check whether package is local or remote.
// If remote, download or update it.
var dir string
local := false
if isLocalPath(pkg) {
dir = pkg
local = true
} else if isStandardPath(pkg) {
dir = path.Join(root, pkg)
local = true
} else {
var err os.Error
dir, err = download(pkg)
if err != nil {
fmt.Fprintf(os.Stderr, "%s: %s: %s\n", argv0, pkg, err)
errors = true
visit[pkg] = done
return
}
}
// Install prerequisites.
files, m, pkgname, err := goFiles(dir, parent == "")
if err != nil {
fmt.Fprintf(os.Stderr, "%s: %s: %s\n", argv0, pkg, err)
errors = true
visit[pkg] = done
return
}
if len(files) == 0 {
fmt.Fprintf(os.Stderr, "%s: %s: package has no files\n", argv0, pkg)
errors = true
visit[pkg] = done
return
}
for p := range m {
install(p, pkg)
}
if pkgname == "main" {
if !errors {
fmt.Fprintf(os.Stderr, "%s: %s's dependencies are installed.\n", argv0, pkg)
}
errors = true
visit[pkg] = done
return
}
// Install this package.
if !errors {
if err := domake(dir, pkg, local); err != nil {
fmt.Fprintf(os.Stderr, "%s: installing %s: %s\n", argv0, pkg, err)
errors = true
}
}
visit[pkg] = done
}
// Is this a local path? /foo ./foo ../foo . ..
func isLocalPath(s string) bool {
return strings.HasPrefix(s, "/") || strings.HasPrefix(s, "./") || strings.HasPrefix(s, "../") || s == "." || s == ".."
}
// Is this a standard package path? strings container/vector etc.
// Assume that if the first element has a dot, it's a domain name
// and is not the standard package path.
func isStandardPath(s string) bool {
dot := strings.Index(s, ".")
slash := strings.Index(s, "/")
return dot < 0 || 0 < slash && slash < dot
}
// run runs the command cmd in directory dir with standard input stdin.
// If the command fails, run prints the command and output on standard error
// in addition to returning a non-nil os.Error.
func run(dir string, stdin []byte, cmd ...string) os.Error {
return genRun(dir, stdin, cmd, false)
}
// quietRun is like run but prints nothing on failure unless -v is used.
func quietRun(dir string, stdin []byte, cmd ...string) os.Error {
return genRun(dir, stdin, cmd, true)
}
// genRun implements run and quietRun.
func genRun(dir string, stdin []byte, cmd []string, quiet bool) os.Error {
bin, err := exec.LookPath(cmd[0])
if err != nil {
// report binary as well as the error
return os.NewError(cmd[0] + ": " + err.String())
}
p, err := exec.Run(bin, cmd, os.Environ(), dir, exec.Pipe, exec.Pipe, exec.MergeWithStdout)
if *verbose {
fmt.Fprintf(os.Stderr, "%s: %s; %s %s\n", argv0, dir, bin, strings.Join(cmd[1:], " "))
}
if err != nil {
return err
}
go func() {
p.Stdin.Write(stdin)
p.Stdin.Close()
}()
var buf bytes.Buffer
io.Copy(&buf, p.Stdout)
io.Copy(&buf, p.Stdout)
w, err := p.Wait(0)
p.Close()
if !w.Exited() || w.ExitStatus() != 0 {
if !quiet || *verbose {
if dir != "" {
dir = "cd " + dir + "; "
}
fmt.Fprintf(os.Stderr, "%s: === %s%s\n", argv0, dir, strings.Join(cmd, " "))
os.Stderr.Write(buf.Bytes())
fmt.Fprintf(os.Stderr, "--- %s\n", w)
}
return os.ErrorString("running " + cmd[0] + ": " + w.String())
}
return nil
}
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