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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.
// Download remote packages.
package main
import (
"http"
"os"
"path"
"regexp"
"strings"
)
const dashboardURL = "http://godashboard.appspot.com/package"
// maybeReportToDashboard reports path to dashboard unless
// -dashboard=false is on command line. It ignores errors.
func maybeReportToDashboard(path string) {
// if -dashboard=false was on command line, do nothing
if !*reportToDashboard {
return
}
// otherwise lob url to dashboard
r, _ := http.Post(dashboardURL, "application/x-www-form-urlencoded", strings.NewReader("path="+path))
if r != nil && r.Body != nil {
r.Body.Close()
}
}
var googlecode = regexp.MustCompile(`^([a-z0-9\-]+\.googlecode\.com/(svn|hg))(/[a-z0-9A-Z_.\-/]*)?$`)
var github = regexp.MustCompile(`^(github\.com/[a-z0-9A-Z_.\-]+/[a-z0-9A-Z_.\-]+)(/[a-z0-9A-Z_.\-/]*)?$`)
var bitbucket = regexp.MustCompile(`^(bitbucket\.org/[a-z0-9A-Z_.\-]+/[a-z0-9A-Z_.\-]+)(/[a-z0-9A-Z_.\-/]*)?$`)
// download checks out or updates pkg from the remote server.
func download(pkg string) (string, os.Error) {
if strings.Index(pkg, "..") >= 0 {
return "", os.ErrorString("invalid path (contains ..)")
}
if m := bitbucket.MatchStrings(pkg); m != nil {
if err := vcsCheckout(&hg, root+m[1], "http://"+m[1], m[1]); err != nil {
return "", err
}
return root + pkg, nil
}
if m := googlecode.MatchStrings(pkg); m != nil {
var v *vcs
switch m[2] {
case "hg":
v = &hg
case "svn":
v = &svn
default:
// regexp only allows hg, svn to get through
panic("missing case in download: " + pkg)
}
if err := vcsCheckout(v, root+m[1], "http://"+m[1], m[1]); err != nil {
return "", err
}
return root + pkg, nil
}
if m := github.MatchStrings(pkg); m != nil {
if strings.HasSuffix(m[1], ".git") {
return "", os.ErrorString("repository " + pkg + " should not have .git suffix")
}
if err := vcsCheckout(&git, root+m[1], "http://"+m[1]+".git", m[1]); err != nil {
return "", err
}
return root + pkg, nil
}
return "", os.ErrorString("unknown repository: " + pkg)
}
// a vcs represents a version control system
// like Mercurial, Git, or Subversion.
type vcs struct {
cmd string
metadir string
clone string
update string
pull string
log string
logLimitFlag string
logReleaseFlag string
}
var hg = vcs{
cmd: "hg",
metadir: ".hg",
clone: "clone",
update: "update",
pull: "pull",
log: "log",
logLimitFlag: "-l1",
logReleaseFlag: "-rrelease",
}
var git = vcs{
cmd: "git",
metadir: ".git",
clone: "clone",
update: "pull",
pull: "fetch",
log: "log",
logLimitFlag: "-n1",
logReleaseFlag: "release",
}
var svn = vcs{
cmd: "svn",
metadir: ".svn",
clone: "checkout",
update: "update",
pull: "",
log: "log",
logLimitFlag: "-l1",
logReleaseFlag: "release",
}
// vcsCheckout checks out repo into dst using vcs.
// It tries to check out (or update, if the dst already
// exists and -u was specified on the command line)
// the repository at tag/branch "release". If there is no
// such tag or branch, it falls back to the repository tip.
func vcsCheckout(vcs *vcs, dst, repo, dashpath string) os.Error {
dir, err := os.Stat(dst + "/" + vcs.metadir)
if err == nil && !dir.IsDirectory() {
return os.ErrorString("not a directory: " + dst)
}
if err != nil {
parent, _ := path.Split(dst)
if err := os.MkdirAll(parent, 0777); err != nil {
return err
}
if err := run("/", nil, vcs.cmd, vcs.clone, repo, dst); err != nil {
return err
}
quietRun(dst, nil, vcs.cmd, vcs.update, "release")
// success on first installation - report
maybeReportToDashboard(dashpath)
} else if *update {
if vcs.pull != "" {
if err := run(dst, nil, vcs.cmd, vcs.pull); err != nil {
return err
}
}
// check for release with hg log -l 1 -r release
// if success, hg update release
// else hg update
if err := quietRun(dst, nil, vcs.cmd, vcs.log, vcs.logLimitFlag, vcs.logReleaseFlag); err == nil {
if err := run(dst, nil, vcs.cmd, vcs.update, "release"); err != nil {
return err
}
} else {
if err := run(dst, nil, vcs.cmd, vcs.update); err != nil {
return err
}
}
}
return nil
}
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