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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/filepath"
"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_.\-/]*)?$`)
var launchpad = regexp.MustCompile(`^(launchpad\.net/([a-z0-9A-Z_.\-]+(/[a-z0-9A-Z_.\-]+)?|~[a-z0-9A-Z_.\-]+/(\+junk|[a-z0-9A-Z_.\-]+)/[a-z0-9A-Z_.\-]+))(/[a-z0-9A-Z_.\-/]+)?$`)
// download checks out or updates pkg from the remote server.
func download(pkg, srcDir string) os.Error {
if strings.Contains(pkg, "..") {
return os.ErrorString("invalid path (contains ..)")
}
if m := bitbucket.FindStringSubmatch(pkg); m != nil {
if err := vcsCheckout(&hg, srcDir, m[1], "http://"+m[1], m[1]); err != nil {
return err
}
return nil
}
if m := googlecode.FindStringSubmatch(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, srcDir, m[1], "https://"+m[1], m[1]); err != nil {
return err
}
return nil
}
if m := github.FindStringSubmatch(pkg); m != nil {
if strings.HasSuffix(m[1], ".git") {
return os.ErrorString("repository " + pkg + " should not have .git suffix")
}
if err := vcsCheckout(&git, srcDir, m[1], "http://"+m[1]+".git", m[1]); err != nil {
return err
}
return nil
}
if m := launchpad.FindStringSubmatch(pkg); m != nil {
// Either lp.net/<project>[/<series>[/<path>]]
// or lp.net/~<user or team>/<project>/<branch>[/<path>]
if err := vcsCheckout(&bzr, srcDir, m[1], "https://"+m[1], m[1]); err != nil {
return err
}
return 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
checkout string
clone string
update string
updateReleaseFlag string
pull string
pullForceFlag string
log string
logLimitFlag string
logReleaseFlag string
}
var hg = vcs{
cmd: "hg",
metadir: ".hg",
checkout: "checkout",
clone: "clone",
update: "update",
updateReleaseFlag: "release",
pull: "pull",
log: "log",
logLimitFlag: "-l1",
logReleaseFlag: "-rrelease",
}
var git = vcs{
cmd: "git",
metadir: ".git",
checkout: "checkout",
clone: "clone",
update: "pull",
updateReleaseFlag: "release",
pull: "fetch",
log: "show-ref",
logLimitFlag: "",
logReleaseFlag: "release",
}
var svn = vcs{
cmd: "svn",
metadir: ".svn",
checkout: "checkout",
clone: "checkout",
update: "update",
updateReleaseFlag: "release",
log: "log",
logLimitFlag: "-l1",
logReleaseFlag: "release",
}
var bzr = vcs{
cmd: "bzr",
metadir: ".bzr",
checkout: "update",
clone: "branch",
update: "update",
updateReleaseFlag: "-rrelease",
pull: "pull",
pullForceFlag: "--overwrite",
log: "log",
logLimitFlag: "-l1",
logReleaseFlag: "-rrelease",
}
// Try to detect if a "release" tag exists. If it does, update
// to the tagged version, otherwise just update the current branch.
// NOTE(_nil): svn will always fail because it is trying to get
// the revision history of a file named "release" instead of
// looking for a commit with a release tag
func (v *vcs) updateRepo(dst string) os.Error {
if err := quietRun(dst, nil, v.cmd, v.log, v.logLimitFlag, v.logReleaseFlag); err == nil {
if err := run(dst, nil, v.cmd, v.checkout, v.updateReleaseFlag); err != nil {
return err
}
} else if err := run(dst, nil, v.cmd, v.update); err != nil {
return err
}
return nil
}
// 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, srcDir, pkgprefix, repo, dashpath string) os.Error {
dst := filepath.Join(srcDir, filepath.FromSlash(pkgprefix))
dir, err := os.Stat(filepath.Join(dst, vcs.metadir))
if err == nil && !dir.IsDirectory() {
return os.ErrorString("not a directory: " + dst)
}
if err != nil {
parent, _ := filepath.Split(dst)
if err := os.MkdirAll(parent, 0777); err != nil {
return err
}
if err := run(string(filepath.Separator), nil, vcs.cmd, vcs.clone, repo, dst); err != nil {
return err
}
if err := vcs.updateRepo(dst); err != nil {
return err
}
// success on first installation - report
maybeReportToDashboard(dashpath)
} else if *update {
// Retrieve new revisions from the remote branch, if the VCS
// supports this operation independently (e.g. svn doesn't)
if vcs.pull != "" {
if vcs.pullForceFlag != "" {
if err := run(dst, nil, vcs.cmd, vcs.pull, vcs.pullForceFlag); err != nil {
return err
}
} else if err := run(dst, nil, vcs.cmd, vcs.pull); err != nil {
return err
}
}
// Update to release or latest revision
if err := vcs.updateRepo(dst); err != nil {
return err
}
}
return nil
}
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