Add generated file

This PR adds generated files under pkg/client and vendor folder.

vendor/golang.org/x/tools/go/vcs/vcs.go

@@ -0,0 +1,768 @@
+// Copyright 2012 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.
+
+// Package vcs exposes functions for resolving import paths
+// and using version control systems, which can be used to
+// implement behavior similar to the standard "go get" command.
+//
+// This package is a copy of internal code in package cmd/go/internal/get,
+// modified to make the identifiers exported. It's provided here
+// for developers who want to write tools with similar semantics.
+// It needs to be manually kept in sync with upstream when changes are
+// made to cmd/go/internal/get; see https://golang.org/issues/11490.
+//
+package vcs // import "golang.org/x/tools/go/vcs"
+
+import (
+	"bytes"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"log"
+	"net/url"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"regexp"
+	"strconv"
+	"strings"
+)
+
+// Verbose enables verbose operation logging.
+var Verbose bool
+
+// ShowCmd controls whether VCS commands are printed.
+var ShowCmd bool
+
+// A Cmd describes how to use a version control system
+// like Mercurial, Git, or Subversion.
+type Cmd struct {
+	Name string
+	Cmd  string // name of binary to invoke command
+
+	CreateCmd   string // command to download a fresh copy of a repository
+	DownloadCmd string // command to download updates into an existing repository
+
+	TagCmd         []TagCmd // commands to list tags
+	TagLookupCmd   []TagCmd // commands to lookup tags before running tagSyncCmd
+	TagSyncCmd     string   // command to sync to specific tag
+	TagSyncDefault string   // command to sync to default tag
+
+	LogCmd string // command to list repository changelogs in an XML format
+
+	Scheme  []string
+	PingCmd string
+}
+
+// A TagCmd describes a command to list available tags
+// that can be passed to Cmd.TagSyncCmd.
+type TagCmd struct {
+	Cmd     string // command to list tags
+	Pattern string // regexp to extract tags from list
+}
+
+// vcsList lists the known version control systems
+var vcsList = []*Cmd{
+	vcsHg,
+	vcsGit,
+	vcsSvn,
+	vcsBzr,
+}
+
+// ByCmd returns the version control system for the given
+// command name (hg, git, svn, bzr).
+func ByCmd(cmd string) *Cmd {
+	for _, vcs := range vcsList {
+		if vcs.Cmd == cmd {
+			return vcs
+		}
+	}
+	return nil
+}
+
+// vcsHg describes how to use Mercurial.
+var vcsHg = &Cmd{
+	Name: "Mercurial",
+	Cmd:  "hg",
+
+	CreateCmd:   "clone -U {repo} {dir}",
+	DownloadCmd: "pull",
+
+	// We allow both tag and branch names as 'tags'
+	// for selecting a version.  This lets people have
+	// a go.release.r60 branch and a go1 branch
+	// and make changes in both, without constantly
+	// editing .hgtags.
+	TagCmd: []TagCmd{
+		{"tags", `^(\S+)`},
+		{"branches", `^(\S+)`},
+	},
+	TagSyncCmd:     "update -r {tag}",
+	TagSyncDefault: "update default",
+
+	LogCmd: "log --encoding=utf-8 --limit={limit} --template={template}",
+
+	Scheme:  []string{"https", "http", "ssh"},
+	PingCmd: "identify {scheme}://{repo}",
+}
+
+// vcsGit describes how to use Git.
+var vcsGit = &Cmd{
+	Name: "Git",
+	Cmd:  "git",
+
+	CreateCmd:   "clone {repo} {dir}",
+	DownloadCmd: "pull --ff-only",
+
+	TagCmd: []TagCmd{
+		// tags/xxx matches a git tag named xxx
+		// origin/xxx matches a git branch named xxx on the default remote repository
+		{"show-ref", `(?:tags|origin)/(\S+)$`},
+	},
+	TagLookupCmd: []TagCmd{
+		{"show-ref tags/{tag} origin/{tag}", `((?:tags|origin)/\S+)$`},
+	},
+	TagSyncCmd:     "checkout {tag}",
+	TagSyncDefault: "checkout master",
+
+	Scheme:  []string{"git", "https", "http", "git+ssh"},
+	PingCmd: "ls-remote {scheme}://{repo}",
+}
+
+// vcsBzr describes how to use Bazaar.
+var vcsBzr = &Cmd{
+	Name: "Bazaar",
+	Cmd:  "bzr",
+
+	CreateCmd: "branch {repo} {dir}",
+
+	// Without --overwrite bzr will not pull tags that changed.
+	// Replace by --overwrite-tags after http://pad.lv/681792 goes in.
+	DownloadCmd: "pull --overwrite",
+
+	TagCmd:         []TagCmd{{"tags", `^(\S+)`}},
+	TagSyncCmd:     "update -r {tag}",
+	TagSyncDefault: "update -r revno:-1",
+
+	Scheme:  []string{"https", "http", "bzr", "bzr+ssh"},
+	PingCmd: "info {scheme}://{repo}",
+}
+
+// vcsSvn describes how to use Subversion.
+var vcsSvn = &Cmd{
+	Name: "Subversion",
+	Cmd:  "svn",
+
+	CreateCmd:   "checkout {repo} {dir}",
+	DownloadCmd: "update",
+
+	// There is no tag command in subversion.
+	// The branch information is all in the path names.
+
+	LogCmd: "log --xml --limit={limit}",
+
+	Scheme:  []string{"https", "http", "svn", "svn+ssh"},
+	PingCmd: "info {scheme}://{repo}",
+}
+
+func (v *Cmd) String() string {
+	return v.Name
+}
+
+// run runs the command line cmd in the given directory.
+// keyval is a list of key, value pairs.  run expands
+// instances of {key} in cmd into value, but only after
+// splitting cmd into individual arguments.
+// If an error occurs, run prints the command line and the
+// command's combined stdout+stderr to standard error.
+// Otherwise run discards the command's output.
+func (v *Cmd) run(dir string, cmd string, keyval ...string) error {
+	_, err := v.run1(dir, cmd, keyval, true)
+	return err
+}
+
+// runVerboseOnly is like run but only generates error output to standard error in verbose mode.
+func (v *Cmd) runVerboseOnly(dir string, cmd string, keyval ...string) error {
+	_, err := v.run1(dir, cmd, keyval, false)
+	return err
+}
+
+// runOutput is like run but returns the output of the command.
+func (v *Cmd) runOutput(dir string, cmd string, keyval ...string) ([]byte, error) {
+	return v.run1(dir, cmd, keyval, true)
+}
+
+// run1 is the generalized implementation of run and runOutput.
+func (v *Cmd) run1(dir string, cmdline string, keyval []string, verbose bool) ([]byte, error) {
+	m := make(map[string]string)
+	for i := 0; i < len(keyval); i += 2 {
+		m[keyval[i]] = keyval[i+1]
+	}
+	args := strings.Fields(cmdline)
+	for i, arg := range args {
+		args[i] = expand(m, arg)
+	}
+
+	_, err := exec.LookPath(v.Cmd)
+	if err != nil {
+		fmt.Fprintf(os.Stderr,
+			"go: missing %s command. See http://golang.org/s/gogetcmd\n",
+			v.Name)
+		return nil, err
+	}
+
+	cmd := exec.Command(v.Cmd, args...)
+	cmd.Dir = dir
+	cmd.Env = envForDir(cmd.Dir)
+	if ShowCmd {
+		fmt.Printf("cd %s\n", dir)
+		fmt.Printf("%s %s\n", v.Cmd, strings.Join(args, " "))
+	}
+	var buf bytes.Buffer
+	cmd.Stdout = &buf
+	cmd.Stderr = &buf
+	err = cmd.Run()
+	out := buf.Bytes()
+	if err != nil {
+		if verbose || Verbose {
+			fmt.Fprintf(os.Stderr, "# cd %s; %s %s\n", dir, v.Cmd, strings.Join(args, " "))
+			os.Stderr.Write(out)
+		}
+		return nil, err
+	}
+	return out, nil
+}
+
+// Ping pings the repo to determine if scheme used is valid.
+// This repo must be pingable with this scheme and VCS.
+func (v *Cmd) Ping(scheme, repo string) error {
+	return v.runVerboseOnly(".", v.PingCmd, "scheme", scheme, "repo", repo)
+}
+
+// Create creates a new copy of repo in dir.
+// The parent of dir must exist; dir must not.
+func (v *Cmd) Create(dir, repo string) error {
+	return v.run(".", v.CreateCmd, "dir", dir, "repo", repo)
+}
+
+// CreateAtRev creates a new copy of repo in dir at revision rev.
+// The parent of dir must exist; dir must not.
+// rev must be a valid revision in repo.
+func (v *Cmd) CreateAtRev(dir, repo, rev string) error {
+	if err := v.Create(dir, repo); err != nil {
+		return err
+	}
+	return v.run(dir, v.TagSyncCmd, "tag", rev)
+}
+
+// Download downloads any new changes for the repo in dir.
+// dir must be a valid VCS repo compatible with v.
+func (v *Cmd) Download(dir string) error {
+	return v.run(dir, v.DownloadCmd)
+}
+
+// Tags returns the list of available tags for the repo in dir.
+// dir must be a valid VCS repo compatible with v.
+func (v *Cmd) Tags(dir string) ([]string, error) {
+	var tags []string
+	for _, tc := range v.TagCmd {
+		out, err := v.runOutput(dir, tc.Cmd)
+		if err != nil {
+			return nil, err
+		}
+		re := regexp.MustCompile(`(?m-s)` + tc.Pattern)
+		for _, m := range re.FindAllStringSubmatch(string(out), -1) {
+			tags = append(tags, m[1])
+		}
+	}
+	return tags, nil
+}
+
+// TagSync syncs the repo in dir to the named tag, which is either a
+// tag returned by Tags or the empty string (the default tag).
+// dir must be a valid VCS repo compatible with v and the tag must exist.
+func (v *Cmd) TagSync(dir, tag string) error {
+	if v.TagSyncCmd == "" {
+		return nil
+	}
+	if tag != "" {
+		for _, tc := range v.TagLookupCmd {
+			out, err := v.runOutput(dir, tc.Cmd, "tag", tag)
+			if err != nil {
+				return err
+			}
+			re := regexp.MustCompile(`(?m-s)` + tc.Pattern)
+			m := re.FindStringSubmatch(string(out))
+			if len(m) > 1 {
+				tag = m[1]
+				break
+			}
+		}
+	}
+	if tag == "" && v.TagSyncDefault != "" {
+		return v.run(dir, v.TagSyncDefault)
+	}
+	return v.run(dir, v.TagSyncCmd, "tag", tag)
+}
+
+// Log logs the changes for the repo in dir.
+// dir must be a valid VCS repo compatible with v.
+func (v *Cmd) Log(dir, logTemplate string) ([]byte, error) {
+	if err := v.Download(dir); err != nil {
+		return []byte{}, err
+	}
+
+	const N = 50 // how many revisions to grab
+	return v.runOutput(dir, v.LogCmd, "limit", strconv.Itoa(N), "template", logTemplate)
+}
+
+// LogAtRev logs the change for repo in dir at the rev revision.
+// dir must be a valid VCS repo compatible with v.
+// rev must be a valid revision for the repo in dir.
+func (v *Cmd) LogAtRev(dir, rev, logTemplate string) ([]byte, error) {
+	if err := v.Download(dir); err != nil {
+		return []byte{}, err
+	}
+
+	// Append revision flag to LogCmd.
+	logAtRevCmd := v.LogCmd + " --rev=" + rev
+	return v.runOutput(dir, logAtRevCmd, "limit", strconv.Itoa(1), "template", logTemplate)
+}
+
+// A vcsPath describes how to convert an import path into a
+// version control system and repository name.
+type vcsPath struct {
+	prefix string                              // prefix this description applies to
+	re     string                              // pattern for import path
+	repo   string                              // repository to use (expand with match of re)
+	vcs    string                              // version control system to use (expand with match of re)
+	check  func(match map[string]string) error // additional checks
+	ping   bool                                // ping for scheme to use to download repo
+
+	regexp *regexp.Regexp // cached compiled form of re
+}
+
+// FromDir inspects dir and its parents to determine the
+// version control system and code repository to use.
+// On return, root is the import path
+// corresponding to the root of the repository.
+func FromDir(dir, srcRoot string) (vcs *Cmd, root string, err error) {
+	// Clean and double-check that dir is in (a subdirectory of) srcRoot.
+	dir = filepath.Clean(dir)
+	srcRoot = filepath.Clean(srcRoot)
+	if len(dir) <= len(srcRoot) || dir[len(srcRoot)] != filepath.Separator {
+		return nil, "", fmt.Errorf("directory %q is outside source root %q", dir, srcRoot)
+	}
+
+	var vcsRet *Cmd
+	var rootRet string
+
+	origDir := dir
+	for len(dir) > len(srcRoot) {
+		for _, vcs := range vcsList {
+			if _, err := os.Stat(filepath.Join(dir, "."+vcs.Cmd)); err == nil {
+				root := filepath.ToSlash(dir[len(srcRoot)+1:])
+				// Record first VCS we find, but keep looking,
+				// to detect mistakes like one kind of VCS inside another.
+				if vcsRet == nil {
+					vcsRet = vcs
+					rootRet = root
+					continue
+				}
+				// Allow .git inside .git, which can arise due to submodules.
+				if vcsRet == vcs && vcs.Cmd == "git" {
+					continue
+				}
+				// Otherwise, we have one VCS inside a different VCS.
+				return nil, "", fmt.Errorf("directory %q uses %s, but parent %q uses %s",
+					filepath.Join(srcRoot, rootRet), vcsRet.Cmd, filepath.Join(srcRoot, root), vcs.Cmd)
+			}
+		}
+
+		// Move to parent.
+		ndir := filepath.Dir(dir)
+		if len(ndir) >= len(dir) {
+			// Shouldn't happen, but just in case, stop.
+			break
+		}
+		dir = ndir
+	}
+
+	if vcsRet != nil {
+		return vcsRet, rootRet, nil
+	}
+
+	return nil, "", fmt.Errorf("directory %q is not using a known version control system", origDir)
+}
+
+// RepoRoot represents a version control system, a repo, and a root of
+// where to put it on disk.
+type RepoRoot struct {
+	VCS *Cmd
+
+	// Repo is the repository URL, including scheme.
+	Repo string
+
+	// Root is the import path corresponding to the root of the
+	// repository.
+	Root string
+}
+
+// RepoRootForImportPath analyzes importPath to determine the
+// version control system, and code repository to use.
+func RepoRootForImportPath(importPath string, verbose bool) (*RepoRoot, error) {
+	rr, err := RepoRootForImportPathStatic(importPath, "")
+	if err == errUnknownSite {
+		rr, err = RepoRootForImportDynamic(importPath, verbose)
+
+		// RepoRootForImportDynamic returns error detail
+		// that is irrelevant if the user didn't intend to use a
+		// dynamic import in the first place.
+		// Squelch it.
+		if err != nil {
+			if Verbose {
+				log.Printf("import %q: %v", importPath, err)
+			}
+			err = fmt.Errorf("unrecognized import path %q", importPath)
+		}
+	}
+
+	if err == nil && strings.Contains(importPath, "...") && strings.Contains(rr.Root, "...") {
+		// Do not allow wildcards in the repo root.
+		rr = nil
+		err = fmt.Errorf("cannot expand ... in %q", importPath)
+	}
+	return rr, err
+}
+
+var errUnknownSite = errors.New("dynamic lookup required to find mapping")
+
+// RepoRootForImportPathStatic attempts to map importPath to a
+// RepoRoot using the commonly-used VCS hosting sites in vcsPaths
+// (github.com/user/dir), or from a fully-qualified importPath already
+// containing its VCS type (foo.com/repo.git/dir)
+//
+// If scheme is non-empty, that scheme is forced.
+func RepoRootForImportPathStatic(importPath, scheme string) (*RepoRoot, error) {
+	if strings.Contains(importPath, "://") {
+		return nil, fmt.Errorf("invalid import path %q", importPath)
+	}
+	for _, srv := range vcsPaths {
+		if !strings.HasPrefix(importPath, srv.prefix) {
+			continue
+		}
+		m := srv.regexp.FindStringSubmatch(importPath)
+		if m == nil {
+			if srv.prefix != "" {
+				return nil, fmt.Errorf("invalid %s import path %q", srv.prefix, importPath)
+			}
+			continue
+		}
+
+		// Build map of named subexpression matches for expand.
+		match := map[string]string{
+			"prefix": srv.prefix,
+			"import": importPath,
+		}
+		for i, name := range srv.regexp.SubexpNames() {
+			if name != "" && match[name] == "" {
+				match[name] = m[i]
+			}
+		}
+		if srv.vcs != "" {
+			match["vcs"] = expand(match, srv.vcs)
+		}
+		if srv.repo != "" {
+			match["repo"] = expand(match, srv.repo)
+		}
+		if srv.check != nil {
+			if err := srv.check(match); err != nil {
+				return nil, err
+			}
+		}
+		vcs := ByCmd(match["vcs"])
+		if vcs == nil {
+			return nil, fmt.Errorf("unknown version control system %q", match["vcs"])
+		}
+		if srv.ping {
+			if scheme != "" {
+				match["repo"] = scheme + "://" + match["repo"]
+			} else {
+				for _, scheme := range vcs.Scheme {
+					if vcs.Ping(scheme, match["repo"]) == nil {
+						match["repo"] = scheme + "://" + match["repo"]
+						break
+					}
+				}
+			}
+		}
+		rr := &RepoRoot{
+			VCS:  vcs,
+			Repo: match["repo"],
+			Root: match["root"],
+		}
+		return rr, nil
+	}
+	return nil, errUnknownSite
+}
+
+// RepoRootForImportDynamic finds a *RepoRoot for a custom domain that's not
+// statically known by RepoRootForImportPathStatic.
+//
+// This handles custom import paths like "name.tld/pkg/foo" or just "name.tld".
+func RepoRootForImportDynamic(importPath string, verbose bool) (*RepoRoot, error) {
+	slash := strings.Index(importPath, "/")
+	if slash < 0 {
+		slash = len(importPath)
+	}
+	host := importPath[:slash]
+	if !strings.Contains(host, ".") {
+		return nil, errors.New("import path doesn't contain a hostname")
+	}
+	urlStr, body, err := httpsOrHTTP(importPath)
+	if err != nil {
+		return nil, fmt.Errorf("http/https fetch: %v", err)
+	}
+	defer body.Close()
+	imports, err := parseMetaGoImports(body)
+	if err != nil {
+		return nil, fmt.Errorf("parsing %s: %v", importPath, err)
+	}
+	metaImport, err := matchGoImport(imports, importPath)
+	if err != nil {
+		if err != errNoMatch {
+			return nil, fmt.Errorf("parse %s: %v", urlStr, err)
+		}
+		return nil, fmt.Errorf("parse %s: no go-import meta tags", urlStr)
+	}
+	if verbose {
+		log.Printf("get %q: found meta tag %#v at %s", importPath, metaImport, urlStr)
+	}
+	// If the import was "uni.edu/bob/project", which said the
+	// prefix was "uni.edu" and the RepoRoot was "evilroot.com",
+	// make sure we don't trust Bob and check out evilroot.com to
+	// "uni.edu" yet (possibly overwriting/preempting another
+	// non-evil student).  Instead, first verify the root and see
+	// if it matches Bob's claim.
+	if metaImport.Prefix != importPath {
+		if verbose {
+			log.Printf("get %q: verifying non-authoritative meta tag", importPath)
+		}
+		urlStr0 := urlStr
+		urlStr, body, err = httpsOrHTTP(metaImport.Prefix)
+		if err != nil {
+			return nil, fmt.Errorf("fetch %s: %v", urlStr, err)
+		}
+		imports, err := parseMetaGoImports(body)
+		if err != nil {
+			return nil, fmt.Errorf("parsing %s: %v", importPath, err)
+		}
+		if len(imports) == 0 {
+			return nil, fmt.Errorf("fetch %s: no go-import meta tag", urlStr)
+		}
+		metaImport2, err := matchGoImport(imports, importPath)
+		if err != nil || metaImport != metaImport2 {
+			return nil, fmt.Errorf("%s and %s disagree about go-import for %s", urlStr0, urlStr, metaImport.Prefix)
+		}
+	}
+
+	if err := validateRepoRoot(metaImport.RepoRoot); err != nil {
+		return nil, fmt.Errorf("%s: invalid repo root %q: %v", urlStr, metaImport.RepoRoot, err)
+	}
+	rr := &RepoRoot{
+		VCS:  ByCmd(metaImport.VCS),
+		Repo: metaImport.RepoRoot,
+		Root: metaImport.Prefix,
+	}
+	if rr.VCS == nil {
+		return nil, fmt.Errorf("%s: unknown vcs %q", urlStr, metaImport.VCS)
+	}
+	return rr, nil
+}
+
+// validateRepoRoot returns an error if repoRoot does not seem to be
+// a valid URL with scheme.
+func validateRepoRoot(repoRoot string) error {
+	url, err := url.Parse(repoRoot)
+	if err != nil {
+		return err
+	}
+	if url.Scheme == "" {
+		return errors.New("no scheme")
+	}
+	return nil
+}
+
+// metaImport represents the parsed <meta name="go-import"
+// content="prefix vcs reporoot" /> tags from HTML files.
+type metaImport struct {
+	Prefix, VCS, RepoRoot string
+}
+
+// errNoMatch is returned from matchGoImport when there's no applicable match.
+var errNoMatch = errors.New("no import match")
+
+// pathPrefix reports whether sub is a prefix of s,
+// only considering entire path components.
+func pathPrefix(s, sub string) bool {
+	// strings.HasPrefix is necessary but not sufficient.
+	if !strings.HasPrefix(s, sub) {
+		return false
+	}
+	// The remainder after the prefix must either be empty or start with a slash.
+	rem := s[len(sub):]
+	return rem == "" || rem[0] == '/'
+}
+
+// matchGoImport returns the metaImport from imports matching importPath.
+// An error is returned if there are multiple matches.
+// errNoMatch is returned if none match.
+func matchGoImport(imports []metaImport, importPath string) (_ metaImport, err error) {
+	match := -1
+	for i, im := range imports {
+		if !pathPrefix(importPath, im.Prefix) {
+			continue
+		}
+
+		if match != -1 {
+			err = fmt.Errorf("multiple meta tags match import path %q", importPath)
+			return
+		}
+		match = i
+	}
+	if match == -1 {
+		err = errNoMatch
+		return
+	}
+	return imports[match], nil
+}
+
+// expand rewrites s to replace {k} with match[k] for each key k in match.
+func expand(match map[string]string, s string) string {
+	for k, v := range match {
+		s = strings.Replace(s, "{"+k+"}", v, -1)
+	}
+	return s
+}
+
+// vcsPaths lists the known vcs paths.
+var vcsPaths = []*vcsPath{
+	// go.googlesource.com
+	{
+		prefix: "go.googlesource.com",
+		re:     `^(?P<root>go\.googlesource\.com/[A-Za-z0-9_.\-]+/?)$`,
+		vcs:    "git",
+		repo:   "https://{root}",
+		check:  noVCSSuffix,
+	},
+
+	// Github
+	{
+		prefix: "github.com/",
+		re:     `^(?P<root>github\.com/[A-Za-z0-9_.\-]+/[A-Za-z0-9_.\-]+)(/[\p{L}0-9_.\-]+)*$`,
+		vcs:    "git",
+		repo:   "https://{root}",
+		check:  noVCSSuffix,
+	},
+
+	// Bitbucket
+	{
+		prefix: "bitbucket.org/",
+		re:     `^(?P<root>bitbucket\.org/(?P<bitname>[A-Za-z0-9_.\-]+/[A-Za-z0-9_.\-]+))(/[A-Za-z0-9_.\-]+)*$`,
+		repo:   "https://{root}",
+		check:  bitbucketVCS,
+	},
+
+	// Launchpad
+	{
+		prefix: "launchpad.net/",
+		re:     `^(?P<root>launchpad\.net/((?P<project>[A-Za-z0-9_.\-]+)(?P<series>/[A-Za-z0-9_.\-]+)?|~[A-Za-z0-9_.\-]+/(\+junk|[A-Za-z0-9_.\-]+)/[A-Za-z0-9_.\-]+))(/[A-Za-z0-9_.\-]+)*$`,
+		vcs:    "bzr",
+		repo:   "https://{root}",
+		check:  launchpadVCS,
+	},
+
+	// Git at OpenStack
+	{
+		prefix: "git.openstack.org",
+		re:     `^(?P<root>git\.openstack\.org/[A-Za-z0-9_.\-]+/[A-Za-z0-9_.\-]+)(\.git)?(/[A-Za-z0-9_.\-]+)*$`,
+		vcs:    "git",
+		repo:   "https://{root}",
+		check:  noVCSSuffix,
+	},
+
+	// General syntax for any server.
+	{
+		re:   `^(?P<root>(?P<repo>([a-z0-9.\-]+\.)+[a-z0-9.\-]+(:[0-9]+)?/[A-Za-z0-9_.\-/]*?)\.(?P<vcs>bzr|git|hg|svn))(/[A-Za-z0-9_.\-]+)*$`,
+		ping: true,
+	},
+}
+
+func init() {
+	// fill in cached regexps.
+	// Doing this eagerly discovers invalid regexp syntax
+	// without having to run a command that needs that regexp.
+	for _, srv := range vcsPaths {
+		srv.regexp = regexp.MustCompile(srv.re)
+	}
+}
+
+// noVCSSuffix checks that the repository name does not
+// end in .foo for any version control system foo.
+// The usual culprit is ".git".
+func noVCSSuffix(match map[string]string) error {
+	repo := match["repo"]
+	for _, vcs := range vcsList {
+		if strings.HasSuffix(repo, "."+vcs.Cmd) {
+			return fmt.Errorf("invalid version control suffix in %s path", match["prefix"])
+		}
+	}
+	return nil
+}
+
+// bitbucketVCS determines the version control system for a
+// Bitbucket repository, by using the Bitbucket API.
+func bitbucketVCS(match map[string]string) error {
+	if err := noVCSSuffix(match); err != nil {
+		return err
+	}
+
+	var resp struct {
+		SCM string `json:"scm"`
+	}
+	url := expand(match, "https://api.bitbucket.org/1.0/repositories/{bitname}")
+	data, err := httpGET(url)
+	if err != nil {
+		return err
+	}
+	if err := json.Unmarshal(data, &resp); err != nil {
+		return fmt.Errorf("decoding %s: %v", url, err)
+	}
+
+	if ByCmd(resp.SCM) != nil {
+		match["vcs"] = resp.SCM
+		if resp.SCM == "git" {
+			match["repo"] += ".git"
+		}
+		return nil
+	}
+
+	return fmt.Errorf("unable to detect version control system for bitbucket.org/ path")
+}
+
+// launchpadVCS solves the ambiguity for "lp.net/project/foo". In this case,
+// "foo" could be a series name registered in Launchpad with its own branch,
+// and it could also be the name of a directory within the main project
+// branch one level up.
+func launchpadVCS(match map[string]string) error {
+	if match["project"] == "" || match["series"] == "" {
+		return nil
+	}
+	_, err := httpGET(expand(match, "https://code.launchpad.net/{project}{series}/.bzr/branch-format"))
+	if err != nil {
+		match["root"] = expand(match, "launchpad.net/{project}")
+		match["repo"] = expand(match, "https://{root}")
+	}
+	return nil
+}