[Vendor] Switch go-version lib (#12719)

* vendor: switch from "mcuadros/go-version" to "hashicorp/go-version" * Adapt P1 * simplify * fix lint * adapt * fix lint & rm old code * no deadlock * rm RWMutex and check GoVersion only 1-time * Copyright header Co-authored-by: techknowlogick <techknowlogick@gitea.io>
5 years ago · cb0ad7427b
--- a/go.mod
+++ b/go.mod
@@ -51,6 +51,7 @@ require (
 	github.com/google/uuid v1.1.1
 	github.com/gorilla/context v1.1.1
 	github.com/hashicorp/go-retryablehttp v0.6.6 // indirect
 	github.com/hashicorp/go-version v1.2.1
 	github.com/huandu/xstrings v1.3.0
 	github.com/issue9/assert v1.3.2 // indirect
 	github.com/issue9/identicon v1.0.1
@@ -65,7 +66,6 @@ require (
 	github.com/markbates/goth v1.61.2
 	github.com/mattn/go-isatty v0.0.12
 	github.com/mattn/go-sqlite3 v1.14.0
 	github.com/mcuadros/go-version v0.0.0-20190308113854-92cdf37c5b75
 	github.com/mgechev/dots v0.0.0-20190921121421-c36f7dcfbb81
 	github.com/mgechev/revive v1.0.2
 	github.com/mholt/archiver/v3 v3.3.0
--- a/go.sum
+++ b/go.sum
@@ -482,6 +482,8 @@ github.com/hashicorp/go-sockaddr v1.0.0/go.mod h1:7Xibr9yA9JjQq1JpNB2Vw7kxv8xerX
 github.com/hashicorp/go-syslog v1.0.0/go.mod h1:qPfqrKkXGihmCqbJM2mZgkZGvKG1dFdvsLplgctolz4=
 github.com/hashicorp/go-uuid v1.0.0/go.mod h1:6SBZvOh/SIDV7/2o3Jml5SYk/TvGqwFJ/bN7x4byOro=
 github.com/hashicorp/go-uuid v1.0.1/go.mod h1:6SBZvOh/SIDV7/2o3Jml5SYk/TvGqwFJ/bN7x4byOro=
 github.com/hashicorp/go-version v1.2.1 h1:zEfKbn2+PDgroKdiOzqiE8rsmLqU2uwi5PB5pBJ3TkI=
 github.com/hashicorp/go-version v1.2.1/go.mod h1:fltr4n8CU8Ke44wwGCBoEymUuxUHl09ZGVZPK5anwXA=
 github.com/hashicorp/go.net v0.0.1/go.mod h1:hjKkEWcCURg++eb33jQU7oqQcI9XDCnUzHA0oac0k90=
 github.com/hashicorp/golang-lru v0.5.0/go.mod h1:/m3WP610KZHVQ1SGc6re/UDhFvYD7pJ4Ao+sR/qLZy8=
 github.com/hashicorp/golang-lru v0.5.1/go.mod h1:/m3WP610KZHVQ1SGc6re/UDhFvYD7pJ4Ao+sR/qLZy8=
@@ -659,8 +661,6 @@ github.com/mattn/go-sqlite3 v1.14.0 h1:mLyGNKR8+Vv9CAU7PphKa2hkEqxxhn8i32J6FPj1/
 github.com/mattn/go-sqlite3 v1.14.0/go.mod h1:JIl7NbARA7phWnGvh0LKTyg7S9BA+6gx71ShQilpsus=
 github.com/matttproud/golang_protobuf_extensions v1.0.1 h1:4hp9jkHxhMHkqkrB3Ix0jegS5sx/RkqARlsWZ6pIwiU=
 github.com/matttproud/golang_protobuf_extensions v1.0.1/go.mod h1:D8He9yQNgCq6Z5Ld7szi9bcBfOoFv/3dc6xSMkL2PC0=
 github.com/mcuadros/go-version v0.0.0-20190308113854-92cdf37c5b75 h1:Pijfgr7ZuvX7QIQiEwLdRVr3RoMG+i0SbBO1Qu+7yVk=
 github.com/mcuadros/go-version v0.0.0-20190308113854-92cdf37c5b75/go.mod h1:76rfSfYPWj01Z85hUf/ituArm797mNKcvINh1OlsZKo=
 github.com/mgechev/dots v0.0.0-20190921121421-c36f7dcfbb81 h1:QASJXOGm2RZ5Ardbc86qNFvby9AqkLDibfChMtAg5QM=
 github.com/mgechev/dots v0.0.0-20190921121421-c36f7dcfbb81/go.mod h1:KQ7+USdGKfpPjXk4Ga+5XxQM4Lm4e3gAogrreFAYpOg=
 github.com/mgechev/revive v1.0.2 h1:v0NxxQ7fSFz/u1NQydPo6EGdq7va0J1BtsZmae6kzUg=
--- a/modules/git/command.go
+++ b/modules/git/command.go
@@ -1,3 +1,4 @@
 // Copyright 2020 The Gitea Authors. All rights reserved.
 // Copyright 2015 The Gogs Authors. All rights reserved.
 // Use of this source code is governed by a MIT-style
 // license that can be found in the LICENSE file.
@@ -11,12 +12,10 @@ import (
 	"io"
 	"os"
 	"os/exec"
 	"runtime"
 	"strings"
 	"time"

 	"code.gitea.io/gitea/modules/process"
 	"github.com/mcuadros/go-version"
 )

 var (
@@ -132,7 +131,7 @@ func (c *Command) RunInDirTimeoutEnvFullPipelineFunc(env []string, timeout time.
 	}

 	// TODO: verify if this is still needed in golang 1.15
 	if version.Compare(runtime.Version(), "go1.15", "<") {
 	if goVersionLessThan115 {
 		cmd.Env = append(cmd.Env, "GODEBUG=asyncpreemptoff=1")
 	}
 	cmd.Dir = dir
--- a/modules/git/commit.go
+++ b/modules/git/commit.go
@@ -21,7 +21,6 @@ import (
 	"strings"

 	"github.com/go-git/go-git/v5/plumbing/object"
 	"github.com/mcuadros/go-version"
 )

 // Commit represents a git commit.
@@ -470,7 +469,7 @@ func (c *Commit) GetSubModule(entryname string) (*SubModule, error) {

 // GetBranchName gets the closest branch name (as returned by 'git name-rev --name-only')
 func (c *Commit) GetBranchName() (string, error) {
 	binVersion, err := BinVersion()
 	err := LoadGitVersion()
 	if err != nil {
 		return "", fmt.Errorf("Git version missing: %v", err)
 	}
@@ -478,7 +477,7 @@ func (c *Commit) GetBranchName() (string, error) {
 	args := []string{
 		"name-rev",
 	}
 	if version.Compare(binVersion, "2.13.0", ">=") {
 	if CheckGitVersionConstraint(">= 2.13.0") == nil {
 		args = append(args, "--exclude", "refs/tags/*")
 	}
 	args = append(args, "--name-only", "--no-undefined", c.ID.String())
--- a/modules/git/git.go
+++ b/modules/git/git.go
@@ -15,14 +15,9 @@ import (

 	"code.gitea.io/gitea/modules/process"

 	"github.com/mcuadros/go-version"
 	"github.com/hashicorp/go-version"
 )

 // Version return this package's current version
 func Version() string {
 	return "0.4.2"
 }

 var (
 	// Debug enables verbose logging on everything.
 	// This should be false in case Gogs starts in SSH mode.
@@ -39,7 +34,10 @@ var (
 	// DefaultContext is the default context to run git commands in
 	DefaultContext = context.Background()

 	gitVersion string
 	gitVersion *version.Version

 	// will be checked on Init
 	goVersionLessThan115 = true
 )

 func log(format string, args ...interface{}) {
@@ -55,31 +53,43 @@ func log(format string, args ...interface{}) {
 	}
 }

 // BinVersion returns current Git version from shell.
 func BinVersion() (string, error) {
 	if len(gitVersion) > 0 {
 		return gitVersion, nil
 // LocalVersion returns current Git version from shell.
 func LocalVersion() (*version.Version, error) {
 	if err := LoadGitVersion(); err != nil {
 		return nil, err
 	}
 	return gitVersion, nil
 }

 // LoadGitVersion returns current Git version from shell.
 func LoadGitVersion() error {
 	// doesn't need RWMutex because its exec by Init()
 	if gitVersion != nil {
 		return nil
 	}

 	stdout, err := NewCommand("version").Run()
 	if err != nil {
 		return "", err
 		return err
 	}

 	fields := strings.Fields(stdout)
 	if len(fields) < 3 {
 		return "", fmt.Errorf("not enough output: %s", stdout)
 		return fmt.Errorf("not enough output: %s", stdout)
 	}

 	var versionString string

 	// Handle special case on Windows.
 	i := strings.Index(fields[2], "windows")
 	if i >= 1 {
 		gitVersion = fields[2][:i-1]
 		return gitVersion, nil
 		versionString = fields[2][:i-1]
 	} else {
 		versionString = fields[2]
 	}

 	gitVersion = fields[2]
 	return gitVersion, nil
 	gitVersion, err = version.NewVersion(versionString)
 	return err
 }

 // SetExecutablePath changes the path of git executable and checks the file permission and version.
@@ -94,11 +104,17 @@ func SetExecutablePath(path string) error {
 	}
 	GitExecutable = absPath

 	gitVersion, err := BinVersion()
 	err = LoadGitVersion()
 	if err != nil {
 		return fmt.Errorf("Git version missing: %v", err)
 	}
 	if version.Compare(gitVersion, GitVersionRequired, "<") {

 	versionRequired, err := version.NewVersion(GitVersionRequired)
 	if err != nil {
 		return err
 	}

 	if gitVersion.LessThan(versionRequired) {
 		return fmt.Errorf("Git version not supported. Requires version > %v", GitVersionRequired)
 	}

@@ -108,6 +124,20 @@ func SetExecutablePath(path string) error {
 // Init initializes git module
 func Init(ctx context.Context) error {
 	DefaultContext = ctx

 	// Save current git version on init to gitVersion otherwise it would require an RWMutex
 	if err := LoadGitVersion(); err != nil {
 		return err
 	}

 	// Save if the go version used to compile gitea is greater or equal 1.15
 	runtimeVersion, err := version.NewVersion(strings.TrimPrefix(runtime.Version(), "go"))
 	if err != nil {
 		return err
 	}
 	version115, _ := version.NewVersion("1.15")
 	goVersionLessThan115 = runtimeVersion.LessThan(version115)

 	// Git requires setting user.name and user.email in order to commit changes - if they're not set just add some defaults
 	for configKey, defaultValue := range map[string]string{"user.name": "Gitea", "user.email": "gitea@fake.local"} {
 		if err := checkAndSetConfig(configKey, defaultValue, false); err != nil {
@@ -120,13 +150,13 @@ func Init(ctx context.Context) error {
 		return err
 	}

 	if version.Compare(gitVersion, "2.10", ">=") {
 	if CheckGitVersionConstraint(">= 2.10") == nil {
 		if err := checkAndSetConfig("receive.advertisePushOptions", "true", true); err != nil {
 			return err
 		}
 	}

 	if version.Compare(gitVersion, "2.18", ">=") {
 	if CheckGitVersionConstraint(">= 2.18") == nil {
 		if err := checkAndSetConfig("core.commitGraph", "true", true); err != nil {
 			return err
 		}
@@ -143,6 +173,21 @@ func Init(ctx context.Context) error {
 	return nil
 }

 // CheckGitVersionConstraint check version constrain against local installed git version
 func CheckGitVersionConstraint(constraint string) error {
 	if err := LoadGitVersion(); err != nil {
 		return err
 	}
 	check, err := version.NewConstraint(constraint)
 	if err != nil {
 		return err
 	}
 	if !check.Check(gitVersion) {
 		return fmt.Errorf("installed git binary  %s does not satisfy version constraint %s", gitVersion.Original(), constraint)
 	}
 	return nil
 }

 func checkAndSetConfig(key, defaultValue string, forceToDefault bool) error {
 	stdout, stderr, err := process.GetManager().Exec("git.Init(get setting)", GitExecutable, "config", "--get", key)
 	if err != nil {
--- a/modules/git/repo_attribute.go
+++ b/modules/git/repo_attribute.go
@@ -7,8 +7,6 @@ package git
 import (
 	"bytes"
 	"fmt"

 	"github.com/mcuadros/go-version"
 )

 // CheckAttributeOpts represents the possible options to CheckAttribute
@@ -21,7 +19,7 @@ type CheckAttributeOpts struct {

 // CheckAttribute return the Blame object of file
 func (repo *Repository) CheckAttribute(opts CheckAttributeOpts) (map[string]map[string]string, error) {
 	binVersion, err := BinVersion()
 	err := LoadGitVersion()
 	if err != nil {
 		return nil, fmt.Errorf("Git version missing: %v", err)
 	}
@@ -42,7 +40,7 @@ func (repo *Repository) CheckAttribute(opts CheckAttributeOpts) (map[string]map[
 	}

 	// git check-attr --cached first appears in git 1.7.8
 	if opts.CachedOnly && version.Compare(binVersion, "1.7.8", ">=") {
 	if opts.CachedOnly && CheckGitVersionConstraint(">= 1.7.8") == nil {
 		cmdArgs = append(cmdArgs, "--cached")
 	}

--- a/modules/git/repo_commit.go
+++ b/modules/git/repo_commit.go
@@ -14,7 +14,6 @@ import (

 	"github.com/go-git/go-git/v5/plumbing"
 	"github.com/go-git/go-git/v5/plumbing/object"
 	"github.com/mcuadros/go-version"
 )

 // GetRefCommitID returns the last commit ID string of given reference (branch or tag).
@@ -470,7 +469,7 @@ func (repo *Repository) getCommitsBeforeLimit(id SHA1, num int) (*list.List, err
 }

 func (repo *Repository) getBranches(commit *Commit, limit int) ([]string, error) {
 	if version.Compare(gitVersion, "2.7.0", ">=") {
 	if CheckGitVersionConstraint(">= 2.7.0") == nil {
 		stdout, err := NewCommand("for-each-ref", "--count="+strconv.Itoa(limit), "--format=%(refname:strip=2)", "--contains", commit.ID.String(), BranchPrefix).RunInDir(repo.Path)
 		if err != nil {
 			return nil, err
--- a/modules/git/repo_tag.go
+++ b/modules/git/repo_tag.go
@@ -10,7 +10,6 @@ import (
 	"strings"

 	"github.com/go-git/go-git/v5/plumbing"
 	"github.com/mcuadros/go-version"
 )

 // TagPrefix tags prefix path on the repository
@@ -239,8 +238,6 @@ func (repo *Repository) GetTags() ([]string, error) {
 		return nil
 	})

 	version.Sort(tagNames)

 	// Reverse order
 	for i := 0; i < len(tagNames)/2; i++ {
 		j := len(tagNames) - i - 1
--- a/modules/git/repo_tree.go
+++ b/modules/git/repo_tree.go
@@ -11,8 +11,6 @@ import (
 	"os"
 	"strings"
 	"time"

 	"github.com/mcuadros/go-version"
 )

 func (repo *Repository) getTree(id SHA1) (*Tree, error) {
@@ -65,7 +63,7 @@ type CommitTreeOpts struct {

 // CommitTree creates a commit from a given tree id for the user with provided message
 func (repo *Repository) CommitTree(sig *Signature, tree *Tree, opts CommitTreeOpts) (SHA1, error) {
 	binVersion, err := BinVersion()
 	err := LoadGitVersion()
 	if err != nil {
 		return SHA1{}, err
 	}
@@ -91,11 +89,11 @@ func (repo *Repository) CommitTree(sig *Signature, tree *Tree, opts CommitTreeOp
 	_, _ = messageBytes.WriteString(opts.Message)
 	_, _ = messageBytes.WriteString("\n")

 	if version.Compare(binVersion, "1.7.9", ">=") && (opts.KeyID != "" || opts.AlwaysSign) {
 	if CheckGitVersionConstraint(">= 1.7.9") == nil && (opts.KeyID != "" || opts.AlwaysSign) {
 		cmd.AddArguments(fmt.Sprintf("-S%s", opts.KeyID))
 	}

 	if version.Compare(binVersion, "2.0.0", ">=") && opts.NoGPGSign {
 	if CheckGitVersionConstraint(">= 2.0.0") == nil && opts.NoGPGSign {
 		cmd.AddArguments("--no-gpg-sign")
 	}

--- a/modules/repofiles/temp_repo.go
+++ b/modules/repofiles/temp_repo.go
@@ -19,8 +19,6 @@ import (
 	"code.gitea.io/gitea/modules/log"
 	"code.gitea.io/gitea/modules/setting"
 	"code.gitea.io/gitea/services/gitdiff"

 	"github.com/mcuadros/go-version"
 )

 // TemporaryUploadRepository is a type to wrap our upload repositories as a shallow clone
@@ -196,7 +194,7 @@ func (t *TemporaryUploadRepository) CommitTreeWithDate(author, committer *models
 	authorSig := author.NewGitSig()
 	committerSig := committer.NewGitSig()

 	binVersion, err := git.BinVersion()
 	err := git.LoadGitVersion()
 	if err != nil {
 		return "", fmt.Errorf("Unable to get git version: %v", err)
 	}
@@ -218,11 +216,11 @@ func (t *TemporaryUploadRepository) CommitTreeWithDate(author, committer *models
 	args := []string{"commit-tree", treeHash, "-p", "HEAD"}

 	// Determine if we should sign
 	if version.Compare(binVersion, "1.7.9", ">=") {
 	if git.CheckGitVersionConstraint(">= 1.7.9") == nil {
 		sign, keyID, _ := t.repo.SignCRUDAction(author, t.basePath, "HEAD")
 		if sign {
 			args = append(args, "-S"+keyID)
 		} else if version.Compare(binVersion, "2.0.0", ">=") {
 		} else if git.CheckGitVersionConstraint(">= 2.0.0") == nil {
 			args = append(args, "--no-gpg-sign")
 		}
 	}
@@ -309,7 +307,7 @@ func (t *TemporaryUploadRepository) DiffIndex() (*gitdiff.Diff, error) {

 // CheckAttribute checks the given attribute of the provided files
 func (t *TemporaryUploadRepository) CheckAttribute(attribute string, args ...string) (map[string]map[string]string, error) {
 	binVersion, err := git.BinVersion()
 	err := git.LoadGitVersion()
 	if err != nil {
 		log.Error("Error retrieving git version: %v", err)
 		return nil, err
@@ -321,7 +319,7 @@ func (t *TemporaryUploadRepository) CheckAttribute(attribute string, args ...str
 	cmdArgs := []string{"check-attr", "-z", attribute}

 	// git check-attr --cached first appears in git 1.7.8
 	if version.Compare(binVersion, "1.7.8", ">=") {
 	if git.CheckGitVersionConstraint(">= 1.7.8") == nil {
 		cmdArgs = append(cmdArgs, "--cached")
 	}
 	cmdArgs = append(cmdArgs, "--")
--- a/modules/repository/init.go
+++ b/modules/repository/init.go
@@ -19,7 +19,6 @@ import (
 	"code.gitea.io/gitea/modules/setting"
 	"code.gitea.io/gitea/modules/util"

 	"github.com/mcuadros/go-version"
 	"github.com/unknwon/com"
 )

@@ -122,7 +121,7 @@ func initRepoCommit(tmpPath string, repo *models.Repository, u *models.User, def
 		return fmt.Errorf("git add --all: %v", err)
 	}

 	binVersion, err := git.BinVersion()
 	err = git.LoadGitVersion()
 	if err != nil {
 		return fmt.Errorf("Unable to get git version: %v", err)
 	}
@@ -132,11 +131,11 @@ func initRepoCommit(tmpPath string, repo *models.Repository, u *models.User, def
 		"-m", "Initial commit",
 	}

 	if version.Compare(binVersion, "1.7.9", ">=") {
 	if git.CheckGitVersionConstraint(">= 1.7.9") == nil {
 		sign, keyID, _ := models.SignInitialCommit(tmpPath, u)
 		if sign {
 			args = append(args, "-S"+keyID)
 		} else if version.Compare(binVersion, "2.0.0", ">=") {
 		} else if git.CheckGitVersionConstraint(">= 2.0.0") == nil {
 			args = append(args, "--no-gpg-sign")
 		}
 	}
--- a/modules/setting/git.go
+++ b/modules/setting/git.go
@@ -9,8 +9,6 @@ import (

 	"code.gitea.io/gitea/modules/git"
 	"code.gitea.io/gitea/modules/log"

 	version "github.com/mcuadros/go-version"
 )

 var (
@@ -71,20 +69,20 @@ func newGit() {
 	}
 	git.DefaultCommandExecutionTimeout = time.Duration(Git.Timeout.Default) * time.Second

 	binVersion, err := git.BinVersion()
 	version, err := git.LocalVersion()
 	if err != nil {
 		log.Fatal("Error retrieving git version: %v", err)
 	}

 	if version.Compare(binVersion, "2.9", ">=") {
 	if git.CheckGitVersionConstraint(">= 2.9") == nil {
 		// Explicitly disable credential helper, otherwise Git credentials might leak
 		git.GlobalCommandArgs = append(git.GlobalCommandArgs, "-c", "credential.helper=")
 	}

 	var format = "Git Version: %s"
 	var args = []interface{}{binVersion}
 	var args = []interface{}{version.Original()}
 	// Since git wire protocol has been released from git v2.18
 	if Git.EnableAutoGitWireProtocol && version.Compare(binVersion, "2.18", ">=") {
 	if Git.EnableAutoGitWireProtocol && git.CheckGitVersionConstraint(">= 2.18") == nil {
 		git.GlobalCommandArgs = append(git.GlobalCommandArgs, "-c", "protocol.version=2")
 		format += ", Wire Protocol %s Enabled"
 		args = append(args, "Version 2") // for focus color
--- a/modules/setting/setting.go
+++ b/modules/setting/setting.go
@@ -28,7 +28,6 @@ import (
 	"code.gitea.io/gitea/modules/user"

 	shellquote "github.com/kballard/go-shellquote"
 	version "github.com/mcuadros/go-version"
 	"github.com/unknwon/com"
 	ini "gopkg.in/ini.v1"
 	"strk.kbt.io/projects/go/libravatar"
@@ -479,12 +478,12 @@ func CheckLFSVersion() {
 		//Disable LFS client hooks if installed for the current OS user
 		//Needs at least git v2.1.2

 		binVersion, err := git.BinVersion()
 		err := git.LoadGitVersion()
 		if err != nil {
 			log.Fatal("Error retrieving git version: %v", err)
 		}

 		if !version.Compare(binVersion, "2.1.2", ">=") {
 		if git.CheckGitVersionConstraint(">= 2.1.2") != nil {
 			LFS.StartServer = false
 			log.Error("LFS server support needs at least Git v2.1.2")
 		} else {
--- a/routers/admin/admin.go
+++ b/routers/admin/admin.go
@@ -243,7 +243,9 @@ func Config(ctx *context.Context) {
 	ctx.Data["DisableRouterLog"] = setting.DisableRouterLog
 	ctx.Data["RunUser"] = setting.RunUser
 	ctx.Data["RunMode"] = strings.Title(macaron.Env)
 	ctx.Data["GitVersion"], _ = git.BinVersion()
 	if version, err := git.LocalVersion(); err == nil {
 		ctx.Data["GitVersion"] = version.Original()
 	}
 	ctx.Data["RepoRootPath"] = setting.RepoRootPath
 	ctx.Data["CustomRootPath"] = setting.CustomPath
 	ctx.Data["StaticRootPath"] = setting.StaticRootPath
--- a/routers/repo/lfs.go
+++ b/routers/repo/lfs.go
@@ -33,7 +33,6 @@ import (
 	gogit "github.com/go-git/go-git/v5"
 	"github.com/go-git/go-git/v5/plumbing"
 	"github.com/go-git/go-git/v5/plumbing/object"
 	"github.com/mcuadros/go-version"
 	"github.com/unknwon/com"
 )

@@ -541,7 +540,7 @@ func LFSPointerFiles(ctx *context.Context) {
 		return
 	}
 	ctx.Data["PageIsSettingsLFS"] = true
 	binVersion, err := git.BinVersion()
 	err := git.LoadGitVersion()
 	if err != nil {
 		log.Fatal("Error retrieving git version: %v", err)
 	}
@@ -586,7 +585,7 @@ func LFSPointerFiles(ctx *context.Context) {
 	go createPointerResultsFromCatFileBatch(catFileBatchReader, &wg, pointerChan, ctx.Repo.Repository, ctx.User)
 	go pipeline.CatFileBatch(shasToBatchReader, catFileBatchWriter, &wg, basePath)
 	go pipeline.BlobsLessThan1024FromCatFileBatchCheck(catFileCheckReader, shasToBatchWriter, &wg)
 	if !version.Compare(binVersion, "2.6.0", ">=") {
 	if git.CheckGitVersionConstraint(">= 2.6.0") != nil {
 		revListReader, revListWriter := io.Pipe()
 		shasToCheckReader, shasToCheckWriter := io.Pipe()
 		wg.Add(2)
--- a/services/mirror/mirror.go
+++ b/services/mirror/mirror.go
@@ -23,7 +23,6 @@ import (
 	"code.gitea.io/gitea/modules/timeutil"
 	"code.gitea.io/gitea/modules/util"

 	"github.com/mcuadros/go-version"
 	"github.com/unknwon/com"
 )

@@ -43,11 +42,11 @@ func readAddress(m *models.Mirror) {

 func remoteAddress(repoPath string) (string, error) {
 	var cmd *git.Command
 	binVersion, err := git.BinVersion()
 	err := git.LoadGitVersion()
 	if err != nil {
 		return "", err
 	}
 	if version.Compare(binVersion, "2.7", ">=") {
 	if git.CheckGitVersionConstraint(">= 2.7") == nil {
 		cmd = git.NewCommand("remote", "get-url", "origin")
 	} else {
 		cmd = git.NewCommand("config", "--get", "remote.origin.url")
--- a/services/pull/merge.go
+++ b/services/pull/merge.go
@@ -25,8 +25,6 @@ import (
 	"code.gitea.io/gitea/modules/setting"
 	"code.gitea.io/gitea/modules/timeutil"
 	issue_service "code.gitea.io/gitea/services/issue"

 	"github.com/mcuadros/go-version"
 )

 // Merge merges pull request to base repository.
@@ -113,9 +111,9 @@ func Merge(pr *models.PullRequest, doer *models.User, baseGitRepo *git.Repositor

 // rawMerge perform the merge operation without changing any pull information in database
 func rawMerge(pr *models.PullRequest, doer *models.User, mergeStyle models.MergeStyle, message string) (string, error) {
 	binVersion, err := git.BinVersion()
 	err := git.LoadGitVersion()
 	if err != nil {
 		log.Error("git.BinVersion: %v", err)
 		log.Error("git.LoadGitVersion: %v", err)
 		return "", fmt.Errorf("Unable to get git version: %v", err)
 	}

@@ -157,7 +155,7 @@ func rawMerge(pr *models.PullRequest, doer *models.User, mergeStyle models.Merge
 	}

 	var gitConfigCommand func() *git.Command
 	if version.Compare(binVersion, "1.8.0", ">=") {
 	if git.CheckGitVersionConstraint(">= 1.8.0") == nil {
 		gitConfigCommand = func() *git.Command {
 			return git.NewCommand("config", "--local")
 		}
@@ -213,11 +211,11 @@ func rawMerge(pr *models.PullRequest, doer *models.User, mergeStyle models.Merge

 	// Determine if we should sign
 	signArg := ""
 	if version.Compare(binVersion, "1.7.9", ">=") {
 	if git.CheckGitVersionConstraint(">= 1.7.9") == nil {
 		sign, keyID, _ := pr.SignMerge(doer, tmpBasePath, "HEAD", trackingBranch)
 		if sign {
 			signArg = "-S" + keyID
 		} else if version.Compare(binVersion, "2.0.0", ">=") {
 		} else if git.CheckGitVersionConstraint(">= 2.0.0") == nil {
 			signArg = "--no-gpg-sign"
 		}
 	}
--- a/vendor/github.com/hashicorp/go-version/LICENSE
+++ b/vendor/github.com/hashicorp/go-version/LICENSE
@@ -0,0 +1,354 @@
 Mozilla Public License, version 2.0

 1. Definitions

 1.1. “Contributor”

     means each individual or legal entity that creates, contributes to the
     creation of, or owns Covered Software.

 1.2. “Contributor Version”

     means the combination of the Contributions of others (if any) used by a
     Contributor and that particular Contributor’s Contribution.

 1.3. “Contribution”

     means Covered Software of a particular Contributor.

 1.4. “Covered Software”

     means Source Code Form to which the initial Contributor has attached the
     notice in Exhibit A, the Executable Form of such Source Code Form, and
     Modifications of such Source Code Form, in each case including portions
     thereof.

 1.5. “Incompatible With Secondary Licenses”
     means

     a. that the initial Contributor has attached the notice described in
        Exhibit B to the Covered Software; or

     b. that the Covered Software was made available under the terms of version
        1.1 or earlier of the License, but not also under the terms of a
        Secondary License.

 1.6. “Executable Form”

     means any form of the work other than Source Code Form.

 1.7. “Larger Work”

     means a work that combines Covered Software with other material, in a separate
     file or files, that is not Covered Software.

 1.8. “License”

     means this document.

 1.9. “Licensable”

     means having the right to grant, to the maximum extent possible, whether at the
     time of the initial grant or subsequently, any and all of the rights conveyed by
     this License.

 1.10. “Modifications”

     means any of the following:

     a. any file in Source Code Form that results from an addition to, deletion
        from, or modification of the contents of Covered Software; or

     b. any new file in Source Code Form that contains any Covered Software.

 1.11. “Patent Claims” of a Contributor

      means any patent claim(s), including without limitation, method, process,
      and apparatus claims, in any patent Licensable by such Contributor that
      would be infringed, but for the grant of the License, by the making,
      using, selling, offering for sale, having made, import, or transfer of
      either its Contributions or its Contributor Version.

 1.12. “Secondary License”

      means either the GNU General Public License, Version 2.0, the GNU Lesser
      General Public License, Version 2.1, the GNU Affero General Public
      License, Version 3.0, or any later versions of those licenses.

 1.13. “Source Code Form”

      means the form of the work preferred for making modifications.

 1.14. “You” (or “Your”)

      means an individual or a legal entity exercising rights under this
      License. For legal entities, “You” includes any entity that controls, is
      controlled by, or is under common control with You. For purposes of this
      definition, “control” means (a) the power, direct or indirect, to cause
      the direction or management of such entity, whether by contract or
      otherwise, or (b) ownership of more than fifty percent (50%) of the
      outstanding shares or beneficial ownership of such entity.


 2. License Grants and Conditions

 2.1. Grants

     Each Contributor hereby grants You a world-wide, royalty-free,
     non-exclusive license:

     a. under intellectual property rights (other than patent or trademark)
        Licensable by such Contributor to use, reproduce, make available,
        modify, display, perform, distribute, and otherwise exploit its
        Contributions, either on an unmodified basis, with Modifications, or as
        part of a Larger Work; and

     b. under Patent Claims of such Contributor to make, use, sell, offer for
        sale, have made, import, and otherwise transfer either its Contributions
        or its Contributor Version.

 2.2. Effective Date

     The licenses granted in Section 2.1 with respect to any Contribution become
     effective for each Contribution on the date the Contributor first distributes
     such Contribution.

 2.3. Limitations on Grant Scope

     The licenses granted in this Section 2 are the only rights granted under this
     License. No additional rights or licenses will be implied from the distribution
     or licensing of Covered Software under this License. Notwithstanding Section
     2.1(b) above, no patent license is granted by a Contributor:

     a. for any code that a Contributor has removed from Covered Software; or

     b. for infringements caused by: (i) Your and any other third party’s
        modifications of Covered Software, or (ii) the combination of its
        Contributions with other software (except as part of its Contributor
        Version); or

     c. under Patent Claims infringed by Covered Software in the absence of its
        Contributions.

     This License does not grant any rights in the trademarks, service marks, or
     logos of any Contributor (except as may be necessary to comply with the
     notice requirements in Section 3.4).

 2.4. Subsequent Licenses

     No Contributor makes additional grants as a result of Your choice to
     distribute the Covered Software under a subsequent version of this License
     (see Section 10.2) or under the terms of a Secondary License (if permitted
     under the terms of Section 3.3).

 2.5. Representation

     Each Contributor represents that the Contributor believes its Contributions
     are its original creation(s) or it has sufficient rights to grant the
     rights to its Contributions conveyed by this License.

 2.6. Fair Use

     This License is not intended to limit any rights You have under applicable
     copyright doctrines of fair use, fair dealing, or other equivalents.

 2.7. Conditions

     Sections 3.1, 3.2, 3.3, and 3.4 are conditions of the licenses granted in
     Section 2.1.


 3. Responsibilities

 3.1. Distribution of Source Form

     All distribution of Covered Software in Source Code Form, including any
     Modifications that You create or to which You contribute, must be under the
     terms of this License. You must inform recipients that the Source Code Form
     of the Covered Software is governed by the terms of this License, and how
     they can obtain a copy of this License. You may not attempt to alter or
     restrict the recipients’ rights in the Source Code Form.

 3.2. Distribution of Executable Form

     If You distribute Covered Software in Executable Form then:

     a. such Covered Software must also be made available in Source Code Form,
        as described in Section 3.1, and You must inform recipients of the
        Executable Form how they can obtain a copy of such Source Code Form by
        reasonable means in a timely manner, at a charge no more than the cost
        of distribution to the recipient; and

     b. You may distribute such Executable Form under the terms of this License,
        or sublicense it under different terms, provided that the license for
        the Executable Form does not attempt to limit or alter the recipients’
        rights in the Source Code Form under this License.

 3.3. Distribution of a Larger Work

     You may create and distribute a Larger Work under terms of Your choice,
     provided that You also comply with the requirements of this License for the
     Covered Software. If the Larger Work is a combination of Covered Software
     with a work governed by one or more Secondary Licenses, and the Covered
     Software is not Incompatible With Secondary Licenses, this License permits
     You to additionally distribute such Covered Software under the terms of
     such Secondary License(s), so that the recipient of the Larger Work may, at
     their option, further distribute the Covered Software under the terms of
     either this License or such Secondary License(s).

 3.4. Notices

     You may not remove or alter the substance of any license notices (including
     copyright notices, patent notices, disclaimers of warranty, or limitations
     of liability) contained within the Source Code Form of the Covered
     Software, except that You may alter any license notices to the extent
     required to remedy known factual inaccuracies.

 3.5. Application of Additional Terms

     You may choose to offer, and to charge a fee for, warranty, support,
     indemnity or liability obligations to one or more recipients of Covered
     Software. However, You may do so only on Your own behalf, and not on behalf
     of any Contributor. You must make it absolutely clear that any such
     warranty, support, indemnity, or liability obligation is offered by You
     alone, and You hereby agree to indemnify every Contributor for any
     liability incurred by such Contributor as a result of warranty, support,
     indemnity or liability terms You offer. You may include additional
     disclaimers of warranty and limitations of liability specific to any
     jurisdiction.

 4. Inability to Comply Due to Statute or Regulation

   If it is impossible for You to comply with any of the terms of this License
   with respect to some or all of the Covered Software due to statute, judicial
   order, or regulation then You must: (a) comply with the terms of this License
   to the maximum extent possible; and (b) describe the limitations and the code
   they affect. Such description must be placed in a text file included with all
   distributions of the Covered Software under this License. Except to the
   extent prohibited by statute or regulation, such description must be
   sufficiently detailed for a recipient of ordinary skill to be able to
   understand it.

 5. Termination

 5.1. The rights granted under this License will terminate automatically if You
     fail to comply with any of its terms. However, if You become compliant,
     then the rights granted under this License from a particular Contributor
     are reinstated (a) provisionally, unless and until such Contributor
     explicitly and finally terminates Your grants, and (b) on an ongoing basis,
     if such Contributor fails to notify You of the non-compliance by some
     reasonable means prior to 60 days after You have come back into compliance.
     Moreover, Your grants from a particular Contributor are reinstated on an
     ongoing basis if such Contributor notifies You of the non-compliance by
     some reasonable means, this is the first time You have received notice of
     non-compliance with this License from such Contributor, and You become
     compliant prior to 30 days after Your receipt of the notice.

 5.2. If You initiate litigation against any entity by asserting a patent
     infringement claim (excluding declaratory judgment actions, counter-claims,
     and cross-claims) alleging that a Contributor Version directly or
     indirectly infringes any patent, then the rights granted to You by any and
     all Contributors for the Covered Software under Section 2.1 of this License
     shall terminate.

 5.3. In the event of termination under Sections 5.1 or 5.2 above, all end user
     license agreements (excluding distributors and resellers) which have been
     validly granted by You or Your distributors under this License prior to
     termination shall survive termination.

 6. Disclaimer of Warranty

   Covered Software is provided under this License on an “as is” basis, without
   warranty of any kind, either expressed, implied, or statutory, including,
   without limitation, warranties that the Covered Software is free of defects,
   merchantable, fit for a particular purpose or non-infringing. The entire
   risk as to the quality and performance of the Covered Software is with You.
   Should any Covered Software prove defective in any respect, You (not any
   Contributor) assume the cost of any necessary servicing, repair, or
   correction. This disclaimer of warranty constitutes an essential part of this
   License. No use of  any Covered Software is authorized under this License
   except under this disclaimer.

 7. Limitation of Liability

   Under no circumstances and under no legal theory, whether tort (including
   negligence), contract, or otherwise, shall any Contributor, or anyone who
   distributes Covered Software as permitted above, be liable to You for any
   direct, indirect, special, incidental, or consequential damages of any
   character including, without limitation, damages for lost profits, loss of
   goodwill, work stoppage, computer failure or malfunction, or any and all
   other commercial damages or losses, even if such party shall have been
   informed of the possibility of such damages. This limitation of liability
   shall not apply to liability for death or personal injury resulting from such
   party’s negligence to the extent applicable law prohibits such limitation.
   Some jurisdictions do not allow the exclusion or limitation of incidental or
   consequential damages, so this exclusion and limitation may not apply to You.

 8. Litigation

   Any litigation relating to this License may be brought only in the courts of
   a jurisdiction where the defendant maintains its principal place of business
   and such litigation shall be governed by laws of that jurisdiction, without
   reference to its conflict-of-law provisions. Nothing in this Section shall
   prevent a party’s ability to bring cross-claims or counter-claims.

 9. Miscellaneous

   This License represents the complete agreement concerning the subject matter
   hereof. If any provision of this License is held to be unenforceable, such
   provision shall be reformed only to the extent necessary to make it
   enforceable. Any law or regulation which provides that the language of a
   contract shall be construed against the drafter shall not be used to construe
   this License against a Contributor.


 10. Versions of the License

 10.1. New Versions

      Mozilla Foundation is the license steward. Except as provided in Section
      10.3, no one other than the license steward has the right to modify or
      publish new versions of this License. Each version will be given a
      distinguishing version number.

 10.2. Effect of New Versions

      You may distribute the Covered Software under the terms of the version of
      the License under which You originally received the Covered Software, or
      under the terms of any subsequent version published by the license
      steward.

 10.3. Modified Versions

      If you create software not governed by this License, and you want to
      create a new license for such software, you may create and use a modified
      version of this License if you rename the license and remove any
      references to the name of the license steward (except to note that such
      modified license differs from this License).

 10.4. Distributing Source Code Form that is Incompatible With Secondary Licenses
      If You choose to distribute Source Code Form that is Incompatible With
      Secondary Licenses under the terms of this version of the License, the
      notice described in Exhibit B of this License must be attached.

 Exhibit A - Source Code Form License Notice

      This Source Code Form is subject to the
      terms of the Mozilla Public License, v.
      2.0. If a copy of the MPL was not
      distributed with this file, You can
      obtain one at
      http://mozilla.org/MPL/2.0/.

 If it is not possible or desirable to put the notice in a particular file, then
 You may include the notice in a location (such as a LICENSE file in a relevant
 directory) where a recipient would be likely to look for such a notice.

 You may add additional accurate notices of copyright ownership.

 Exhibit B - “Incompatible With Secondary Licenses” Notice

      This Source Code Form is “Incompatible
      With Secondary Licenses”, as defined by
      the Mozilla Public License, v. 2.0.

--- a/vendor/github.com/hashicorp/go-version/README.md
+++ b/vendor/github.com/hashicorp/go-version/README.md
@@ -0,0 +1,66 @@
 # Versioning Library for Go
 [![Build Status](https://circleci.com/gh/hashicorp/go-version/tree/master.svg?style=svg)](https://circleci.com/gh/hashicorp/go-version/tree/master)
 [![GoDoc](https://godoc.org/github.com/hashicorp/go-version?status.svg)](https://godoc.org/github.com/hashicorp/go-version)

 go-version is a library for parsing versions and version constraints,
 and verifying versions against a set of constraints. go-version
 can sort a collection of versions properly, handles prerelease/beta
 versions, can increment versions, etc.

 Versions used with go-version must follow [SemVer](http://semver.org/).

 ## Installation and Usage

 Package documentation can be found on
 [GoDoc](http://godoc.org/github.com/hashicorp/go-version).

 Installation can be done with a normal `go get`:

 ```
 $ go get github.com/hashicorp/go-version
 ```

 #### Version Parsing and Comparison

 ```go
 v1, err := version.NewVersion("1.2")
 v2, err := version.NewVersion("1.5+metadata")

 // Comparison example. There is also GreaterThan, Equal, and just
 // a simple Compare that returns an int allowing easy >=, <=, etc.
 if v1.LessThan(v2) {
    fmt.Printf("%s is less than %s", v1, v2)
 }
 ```

 #### Version Constraints

 ```go
 v1, err := version.NewVersion("1.2")

 // Constraints example.
 constraints, err := version.NewConstraint(">= 1.0, < 1.4")
 if constraints.Check(v1) {
 	fmt.Printf("%s satisfies constraints %s", v1, constraints)
 }
 ```

 #### Version Sorting

 ```go
 versionsRaw := []string{"1.1", "0.7.1", "1.4-beta", "1.4", "2"}
 versions := make([]*version.Version, len(versionsRaw))
 for i, raw := range versionsRaw {
    v, _ := version.NewVersion(raw)
    versions[i] = v
 }

 // After this, the versions are properly sorted
 sort.Sort(version.Collection(versions))
 ```

 ## Issues and Contributing

 If you find an issue with this library, please report an issue. If you'd
 like, we welcome any contributions. Fork this library and submit a pull
 request.
--- a/vendor/github.com/hashicorp/go-version/constraint.go
+++ b/vendor/github.com/hashicorp/go-version/constraint.go
@@ -0,0 +1,204 @@
 package version

 import (
 	"fmt"
 	"reflect"
 	"regexp"
 	"strings"
 )

 // Constraint represents a single constraint for a version, such as
 // ">= 1.0".
 type Constraint struct {
 	f        constraintFunc
 	check    *Version
 	original string
 }

 // Constraints is a slice of constraints. We make a custom type so that
 // we can add methods to it.
 type Constraints []*Constraint

 type constraintFunc func(v, c *Version) bool

 var constraintOperators map[string]constraintFunc

 var constraintRegexp *regexp.Regexp

 func init() {
 	constraintOperators = map[string]constraintFunc{
 		"":   constraintEqual,
 		"=":  constraintEqual,
 		"!=": constraintNotEqual,
 		">":  constraintGreaterThan,
 		"<":  constraintLessThan,
 		">=": constraintGreaterThanEqual,
 		"<=": constraintLessThanEqual,
 		"~>": constraintPessimistic,
 	}

 	ops := make([]string, 0, len(constraintOperators))
 	for k := range constraintOperators {
 		ops = append(ops, regexp.QuoteMeta(k))
 	}

 	constraintRegexp = regexp.MustCompile(fmt.Sprintf(
 		`^\s*(%s)\s*(%s)\s*$`,
 		strings.Join(ops, "|"),
 		VersionRegexpRaw))
 }

 // NewConstraint will parse one or more constraints from the given
 // constraint string. The string must be a comma-separated list of
 // constraints.
 func NewConstraint(v string) (Constraints, error) {
 	vs := strings.Split(v, ",")
 	result := make([]*Constraint, len(vs))
 	for i, single := range vs {
 		c, err := parseSingle(single)
 		if err != nil {
 			return nil, err
 		}

 		result[i] = c
 	}

 	return Constraints(result), nil
 }

 // Check tests if a version satisfies all the constraints.
 func (cs Constraints) Check(v *Version) bool {
 	for _, c := range cs {
 		if !c.Check(v) {
 			return false
 		}
 	}

 	return true
 }

 // Returns the string format of the constraints
 func (cs Constraints) String() string {
 	csStr := make([]string, len(cs))
 	for i, c := range cs {
 		csStr[i] = c.String()
 	}

 	return strings.Join(csStr, ",")
 }

 // Check tests if a constraint is validated by the given version.
 func (c *Constraint) Check(v *Version) bool {
 	return c.f(v, c.check)
 }

 func (c *Constraint) String() string {
 	return c.original
 }

 func parseSingle(v string) (*Constraint, error) {
 	matches := constraintRegexp.FindStringSubmatch(v)
 	if matches == nil {
 		return nil, fmt.Errorf("Malformed constraint: %s", v)
 	}

 	check, err := NewVersion(matches[2])
 	if err != nil {
 		return nil, err
 	}

 	return &Constraint{
 		f:        constraintOperators[matches[1]],
 		check:    check,
 		original: v,
 	}, nil
 }

 func prereleaseCheck(v, c *Version) bool {
 	switch vPre, cPre := v.Prerelease() != "", c.Prerelease() != ""; {
 	case cPre && vPre:
 		// A constraint with a pre-release can only match a pre-release version
 		// with the same base segments.
 		return reflect.DeepEqual(c.Segments64(), v.Segments64())

 	case !cPre && vPre:
 		// A constraint without a pre-release can only match a version without a
 		// pre-release.
 		return false

 	case cPre && !vPre:
 		// OK, except with the pessimistic operator
 	case !cPre && !vPre:
 		// OK
 	}
 	return true
 }

 //-------------------------------------------------------------------
 // Constraint functions
 //-------------------------------------------------------------------

 func constraintEqual(v, c *Version) bool {
 	return v.Equal(c)
 }

 func constraintNotEqual(v, c *Version) bool {
 	return !v.Equal(c)
 }

 func constraintGreaterThan(v, c *Version) bool {
 	return prereleaseCheck(v, c) && v.Compare(c) == 1
 }

 func constraintLessThan(v, c *Version) bool {
 	return prereleaseCheck(v, c) && v.Compare(c) == -1
 }

 func constraintGreaterThanEqual(v, c *Version) bool {
 	return prereleaseCheck(v, c) && v.Compare(c) >= 0
 }

 func constraintLessThanEqual(v, c *Version) bool {
 	return prereleaseCheck(v, c) && v.Compare(c) <= 0
 }

 func constraintPessimistic(v, c *Version) bool {
 	// Using a pessimistic constraint with a pre-release, restricts versions to pre-releases
 	if !prereleaseCheck(v, c) || (c.Prerelease() != "" && v.Prerelease() == "") {
 		return false
 	}

 	// If the version being checked is naturally less than the constraint, then there
 	// is no way for the version to be valid against the constraint
 	if v.LessThan(c) {
 		return false
 	}
 	// We'll use this more than once, so grab the length now so it's a little cleaner
 	// to write the later checks
 	cs := len(c.segments)

 	// If the version being checked has less specificity than the constraint, then there
 	// is no way for the version to be valid against the constraint
 	if cs > len(v.segments) {
 		return false
 	}

 	// Check the segments in the constraint against those in the version. If the version
 	// being checked, at any point, does not have the same values in each index of the
 	// constraints segments, then it cannot be valid against the constraint.
 	for i := 0; i < c.si-1; i++ {
 		if v.segments[i] != c.segments[i] {
 			return false
 		}
 	}

 	// Check the last part of the segment in the constraint. If the version segment at
 	// this index is less than the constraints segment at this index, then it cannot
 	// be valid against the constraint
 	if c.segments[cs-1] > v.segments[cs-1] {
 		return false
 	}

 	// If nothing has rejected the version by now, it's valid
 	return true
 }
--- a/vendor/github.com/hashicorp/go-version/go.mod
+++ b/vendor/github.com/hashicorp/go-version/go.mod
@@ -0,0 +1 @@
 module github.com/hashicorp/go-version
--- a/vendor/github.com/hashicorp/go-version/version.go
+++ b/vendor/github.com/hashicorp/go-version/version.go
@@ -0,0 +1,384 @@
 package version

 import (
 	"bytes"
 	"fmt"
 	"reflect"
 	"regexp"
 	"strconv"
 	"strings"
 )

 // The compiled regular expression used to test the validity of a version.
 var (
 	versionRegexp *regexp.Regexp
 	semverRegexp  *regexp.Regexp
 )

 // The raw regular expression string used for testing the validity
 // of a version.
 const (
 	VersionRegexpRaw string = `v?([0-9]+(\.[0-9]+)*?)` +
 		`(-([0-9]+[0-9A-Za-z\-~]*(\.[0-9A-Za-z\-~]+)*)|(-?([A-Za-z\-~]+[0-9A-Za-z\-~]*(\.[0-9A-Za-z\-~]+)*)))?` +
 		`(\+([0-9A-Za-z\-~]+(\.[0-9A-Za-z\-~]+)*))?` +
 		`?`

 	// SemverRegexpRaw requires a separator between version and prerelease
 	SemverRegexpRaw string = `v?([0-9]+(\.[0-9]+)*?)` +
 		`(-([0-9]+[0-9A-Za-z\-~]*(\.[0-9A-Za-z\-~]+)*)|(-([A-Za-z\-~]+[0-9A-Za-z\-~]*(\.[0-9A-Za-z\-~]+)*)))?` +
 		`(\+([0-9A-Za-z\-~]+(\.[0-9A-Za-z\-~]+)*))?` +
 		`?`
 )

 // Version represents a single version.
 type Version struct {
 	metadata string
 	pre      string
 	segments []int64
 	si       int
 	original string
 }

 func init() {
 	versionRegexp = regexp.MustCompile("^" + VersionRegexpRaw + "$")
 	semverRegexp = regexp.MustCompile("^" + SemverRegexpRaw + "$")
 }

 // NewVersion parses the given version and returns a new
 // Version.
 func NewVersion(v string) (*Version, error) {
 	return newVersion(v, versionRegexp)
 }

 // NewSemver parses the given version and returns a new
 // Version that adheres strictly to SemVer specs
 // https://semver.org/
 func NewSemver(v string) (*Version, error) {
 	return newVersion(v, semverRegexp)
 }

 func newVersion(v string, pattern *regexp.Regexp) (*Version, error) {
 	matches := pattern.FindStringSubmatch(v)
 	if matches == nil {
 		return nil, fmt.Errorf("Malformed version: %s", v)
 	}
 	segmentsStr := strings.Split(matches[1], ".")
 	segments := make([]int64, len(segmentsStr))
 	si := 0
 	for i, str := range segmentsStr {
 		val, err := strconv.ParseInt(str, 10, 64)
 		if err != nil {
 			return nil, fmt.Errorf(
 				"Error parsing version: %s", err)
 		}

 		segments[i] = int64(val)
 		si++
 	}

 	// Even though we could support more than three segments, if we
 	// got less than three, pad it with 0s. This is to cover the basic
 	// default usecase of semver, which is MAJOR.MINOR.PATCH at the minimum
 	for i := len(segments); i < 3; i++ {
 		segments = append(segments, 0)
 	}

 	pre := matches[7]
 	if pre == "" {
 		pre = matches[4]
 	}

 	return &Version{
 		metadata: matches[10],
 		pre:      pre,
 		segments: segments,
 		si:       si,
 		original: v,
 	}, nil
 }

 // Must is a helper that wraps a call to a function returning (*Version, error)
 // and panics if error is non-nil.
 func Must(v *Version, err error) *Version {
 	if err != nil {
 		panic(err)
 	}

 	return v
 }

 // Compare compares this version to another version. This
 // returns -1, 0, or 1 if this version is smaller, equal,
 // or larger than the other version, respectively.
 //
 // If you want boolean results, use the LessThan, Equal,
 // GreaterThan, GreaterThanOrEqual or LessThanOrEqual methods.
 func (v *Version) Compare(other *Version) int {
 	// A quick, efficient equality check
 	if v.String() == other.String() {
 		return 0
 	}

 	segmentsSelf := v.Segments64()
 	segmentsOther := other.Segments64()

 	// If the segments are the same, we must compare on prerelease info
 	if reflect.DeepEqual(segmentsSelf, segmentsOther) {
 		preSelf := v.Prerelease()
 		preOther := other.Prerelease()
 		if preSelf == "" && preOther == "" {
 			return 0
 		}
 		if preSelf == "" {
 			return 1
 		}
 		if preOther == "" {
 			return -1
 		}

 		return comparePrereleases(preSelf, preOther)
 	}

 	// Get the highest specificity (hS), or if they're equal, just use segmentSelf length
 	lenSelf := len(segmentsSelf)
 	lenOther := len(segmentsOther)
 	hS := lenSelf
 	if lenSelf < lenOther {
 		hS = lenOther
 	}
 	// Compare the segments
 	// Because a constraint could have more/less specificity than the version it's
 	// checking, we need to account for a lopsided or jagged comparison
 	for i := 0; i < hS; i++ {
 		if i > lenSelf-1 {
 			// This means Self had the lower specificity
 			// Check to see if the remaining segments in Other are all zeros
 			if !allZero(segmentsOther[i:]) {
 				// if not, it means that Other has to be greater than Self
 				return -1
 			}
 			break
 		} else if i > lenOther-1 {
 			// this means Other had the lower specificity
 			// Check to see if the remaining segments in Self are all zeros -
 			if !allZero(segmentsSelf[i:]) {
 				//if not, it means that Self has to be greater than Other
 				return 1
 			}
 			break
 		}
 		lhs := segmentsSelf[i]
 		rhs := segmentsOther[i]
 		if lhs == rhs {
 			continue
 		} else if lhs < rhs {
 			return -1
 		}
 		// Otherwis, rhs was > lhs, they're not equal
 		return 1
 	}

 	// if we got this far, they're equal
 	return 0
 }

 func allZero(segs []int64) bool {
 	for _, s := range segs {
 		if s != 0 {
 			return false
 		}
 	}
 	return true
 }

 func comparePart(preSelf string, preOther string) int {
 	if preSelf == preOther {
 		return 0
 	}

 	var selfInt int64
 	selfNumeric := true
 	selfInt, err := strconv.ParseInt(preSelf, 10, 64)
 	if err != nil {
 		selfNumeric = false
 	}

 	var otherInt int64
 	otherNumeric := true
 	otherInt, err = strconv.ParseInt(preOther, 10, 64)
 	if err != nil {
 		otherNumeric = false
 	}

 	// if a part is empty, we use the other to decide
 	if preSelf == "" {
 		if otherNumeric {
 			return -1
 		}
 		return 1
 	}

 	if preOther == "" {
 		if selfNumeric {
 			return 1
 		}
 		return -1
 	}

 	if selfNumeric && !otherNumeric {
 		return -1
 	} else if !selfNumeric && otherNumeric {
 		return 1
 	} else if !selfNumeric && !otherNumeric && preSelf > preOther {
 		return 1
 	} else if selfInt > otherInt {
 		return 1
 	}

 	return -1
 }

 func comparePrereleases(v string, other string) int {
 	// the same pre release!
 	if v == other {
 		return 0
 	}

 	// split both pre releases for analyse their parts
 	selfPreReleaseMeta := strings.Split(v, ".")
 	otherPreReleaseMeta := strings.Split(other, ".")

 	selfPreReleaseLen := len(selfPreReleaseMeta)
 	otherPreReleaseLen := len(otherPreReleaseMeta)

 	biggestLen := otherPreReleaseLen
 	if selfPreReleaseLen > otherPreReleaseLen {
 		biggestLen = selfPreReleaseLen
 	}

 	// loop for parts to find the first difference
 	for i := 0; i < biggestLen; i = i + 1 {
 		partSelfPre := ""
 		if i < selfPreReleaseLen {
 			partSelfPre = selfPreReleaseMeta[i]
 		}

 		partOtherPre := ""
 		if i < otherPreReleaseLen {
 			partOtherPre = otherPreReleaseMeta[i]
 		}

 		compare := comparePart(partSelfPre, partOtherPre)
 		// if parts are equals, continue the loop
 		if compare != 0 {
 			return compare
 		}
 	}

 	return 0
 }

 // Equal tests if two versions are equal.
 func (v *Version) Equal(o *Version) bool {
 	if v == nil || o == nil {
 		return v == o
 	}

 	return v.Compare(o) == 0
 }

 // GreaterThan tests if this version is greater than another version.
 func (v *Version) GreaterThan(o *Version) bool {
 	return v.Compare(o) > 0
 }

 // GreaterThanOrEqual tests if this version is greater than or equal to another version.
 func (v *Version) GreaterThanOrEqual(o *Version) bool {
 	return v.Compare(o) >= 0
 }

 // LessThan tests if this version is less than another version.
 func (v *Version) LessThan(o *Version) bool {
 	return v.Compare(o) < 0
 }

 // LessThanOrEqual tests if this version is less than or equal to another version.
 func (v *Version) LessThanOrEqual(o *Version) bool {
 	return v.Compare(o) <= 0
 }

 // Metadata returns any metadata that was part of the version
 // string.
 //
 // Metadata is anything that comes after the "+" in the version.
 // For example, with "1.2.3+beta", the metadata is "beta".
 func (v *Version) Metadata() string {
 	return v.metadata
 }

 // Prerelease returns any prerelease data that is part of the version,
 // or blank if there is no prerelease data.
 //
 // Prerelease information is anything that comes after the "-" in the
 // version (but before any metadata). For example, with "1.2.3-beta",
 // the prerelease information is "beta".
 func (v *Version) Prerelease() string {
 	return v.pre
 }

 // Segments returns the numeric segments of the version as a slice of ints.
 //
 // This excludes any metadata or pre-release information. For example,
 // for a version "1.2.3-beta", segments will return a slice of
 // 1, 2, 3.
 func (v *Version) Segments() []int {
 	segmentSlice := make([]int, len(v.segments))
 	for i, v := range v.segments {
 		segmentSlice[i] = int(v)
 	}
 	return segmentSlice
 }

 // Segments64 returns the numeric segments of the version as a slice of int64s.
 //
 // This excludes any metadata or pre-release information. For example,
 // for a version "1.2.3-beta", segments will return a slice of
 // 1, 2, 3.
 func (v *Version) Segments64() []int64 {
 	result := make([]int64, len(v.segments))
 	copy(result, v.segments)
 	return result
 }

 // String returns the full version string included pre-release
 // and metadata information.
 //
 // This value is rebuilt according to the parsed segments and other
 // information. Therefore, ambiguities in the version string such as
 // prefixed zeroes (1.04.0 => 1.4.0), `v` prefix (v1.0.0 => 1.0.0), and
 // missing parts (1.0 => 1.0.0) will be made into a canonicalized form
 // as shown in the parenthesized examples.
 func (v *Version) String() string {
 	var buf bytes.Buffer
 	fmtParts := make([]string, len(v.segments))
 	for i, s := range v.segments {
 		// We can ignore err here since we've pre-parsed the values in segments
 		str := strconv.FormatInt(s, 10)
 		fmtParts[i] = str
 	}
 	fmt.Fprintf(&buf, strings.Join(fmtParts, "."))
 	if v.pre != "" {
 		fmt.Fprintf(&buf, "-%s", v.pre)
 	}
 	if v.metadata != "" {
 		fmt.Fprintf(&buf, "+%s", v.metadata)
 	}

 	return buf.String()
 }

 // Original returns the original parsed version as-is, including any
 // potential whitespace, `v` prefix, etc.
 func (v *Version) Original() string {
 	return v.original
 }
--- a/vendor/github.com/hashicorp/go-version/version_collection.go
+++ b/vendor/github.com/hashicorp/go-version/version_collection.go
@@ -0,0 +1,17 @@
 package version

 // Collection is a type that implements the sort.Interface interface
 // so that versions can be sorted.
 type Collection []*Version

 func (v Collection) Len() int {
 	return len(v)
 }

 func (v Collection) Less(i, j int) bool {
 	return v[i].LessThan(v[j])
 }

 func (v Collection) Swap(i, j int) {
 	v[i], v[j] = v[j], v[i]
 }
--- a/vendor/github.com/mcuadros/go-version/.gitignore
+++ b/vendor/github.com/mcuadros/go-version/.gitignore
@@ -1,22 +0,0 @@
 # Compiled Object files, Static and Dynamic libs (Shared Objects)
 *.o
 *.a
 *.so

 # Folders
 _obj
 _test

 # Architecture specific extensions/prefixes
 *.[568vq]
 [568vq].out

 *.cgo1.go
 *.cgo2.c
 _cgo_defun.c
 _cgo_gotypes.go
 _cgo_export.*

 _testmain.go

 *.exe
--- a/vendor/github.com/mcuadros/go-version/.travis.yml
+++ b/vendor/github.com/mcuadros/go-version/.travis.yml
@@ -1 +0,0 @@
 language: go
--- a/vendor/github.com/mcuadros/go-version/LICENSE
+++ b/vendor/github.com/mcuadros/go-version/LICENSE
@@ -1,19 +0,0 @@
 Copyright (c) 2013 Máximo Cuadros

 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
 in the Software without restriction, including without limitation the rights
 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 copies of the Software, and to permit persons to whom the Software is furnished
 to do so, subject to the following conditions:

 The above copyright notice and this permission notice shall be included in all
 copies or substantial portions of the Software.

 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 THE SOFTWARE.
--- a/vendor/github.com/mcuadros/go-version/README.md
+++ b/vendor/github.com/mcuadros/go-version/README.md
@@ -1,80 +0,0 @@
 go-version [![Build Status](https://travis-ci.org/mcuadros/go-version.svg?branch=master)](https://travis-ci.org/mcuadros/go-version) [![GoDoc](https://godoc.org/github.com/mcuadros/go-version?status.svg)](http://godoc.org/github.com/mcuadros/go-version)
 ==============================

 Version normalizer and comparison library for go, heavy based on PHP version_compare function and Version comparsion libs from [Composer](https://github.com/composer/composer) PHP project

 Installation
 ------------

 The recommended way to install go-version

 ```
 go get github.com/mcuadros/go-version
 ```

 Examples
 --------

 How import the package

 ```go
 import (
    "github.com/mcuadros/go-version"
 )
 ```

 `version.Normalize()`: Normalizes a version string to be able to perform comparisons on it

 ```go
 version.Normalize("10.4.13-b")
 //Returns: 10.4.13.0-beta
 ```


 `version.CompareSimple()`: Compares two normalizated version number strings

 ```go
 version.CompareSimple("1.2", "1.0.1")
 //Returns: 1

 version.CompareSimple("1.0rc1", "1.0")
 //Returns: -1
 ```


 `version.Compare()`: Compares two normalizated version number strings, for a particular relationship

 ```go
 version.Compare("1.0-dev", "1.0", "<")
 //Returns: true

 version.Compare("1.0rc1", "1.0", ">=")
 //Returns: false

 version.Compare("2.3.4", "v3.1.2", "<")
 //Returns: true
 ```

 `version.ConstrainGroup.Match()`: Match a given version againts a group of constrains, read about constraint string format at [Composer documentation](http://getcomposer.org/doc/01-basic-usage.md#package-versions)  

 ```go
 c := version.NewConstrainGroupFromString(">2.0,<=3.0")
 c.Match("2.5.0beta")
 //Returns: true

 c := version.NewConstrainGroupFromString("~1.2.3")
 c.Match("1.2.3.5")
 //Returns: true
 ```

 `version.Sort()`: Sorts a string slice of version number strings using version.CompareSimple()

 ```go
 version.Sort([]string{"1.10-dev", "1.0rc1", "1.0", "1.0-dev"})
 //Returns []string{"1.0-dev", "1.0rc1", "1.0", "1.10-dev"}
 ```

 License
 -------

 MIT, see [LICENSE](LICENSE)
--- a/vendor/github.com/mcuadros/go-version/compare.go
+++ b/vendor/github.com/mcuadros/go-version/compare.go
@@ -1,173 +0,0 @@
 package version

 import (
 	"regexp"
 	"strconv"
 	"strings"
 )

 var regexpSigns = regexp.MustCompile(`[_\-+]`)
 var regexpDotBeforeDigit = regexp.MustCompile(`([^.\d]+)`)
 var regexpMultipleDots = regexp.MustCompile(`\.{2,}`)

 var specialForms = map[string]int{
 	"SNAPSHOT": -7,
 	"snapshot": -7,
 	"dev":      -6,
 	"alpha":    -5,
 	"a":        -5,
 	"beta":     -4,
 	"b":        -4,
 	"RC":       -3,
 	"rc":       -3,
 	"#":        -2,
 	"p":        1,
 	"pl":       1,
 }

 var unknownForm int = -7

 // Compares two version number strings, for a particular relationship
 //
 // Usage
 //     version.Compare("2.3.4", "v3.1.2", "<")
 //     Returns: true
 //
 //     version.Compare("1.0rc1", "1.0", ">=")
 //     Returns: false
 func Compare(version1, version2, operator string) bool {
 	version1N := Normalize(version1)
 	version2N := Normalize(version2)

 	return CompareNormalized(version1N, version2N, operator)
 }

 // Compares two normalizated version number strings, for a particular relationship
 //
 // The function first replaces _, - and + with a dot . in the version strings
 // and also inserts dots . before and after any non number so that for example
 // '4.3.2RC1' becomes '4.3.2.RC.1'.
 //
 // Then it splits the results like if you were using Split(version, '.').
 // Then it compares the parts starting from left to right. If a part contains
 // special version strings these are handled in the following order: any string
 // not found in this list:
 //   < dev < alpha = a < beta = b < RC = rc < # < pl = p.
 //
 // Usage
 //     version.CompareNormalized("1.0-dev", "1.0", "<")
 //     Returns: true
 //
 //     version.CompareNormalized("1.0rc1", "1.0", ">=")
 //     Returns: false
 //
 //     version.CompareNormalized("1.0", "1.0b1", "ge")
 //     Returns: true
 func CompareNormalized(version1, version2, operator string) bool {
 	compare := CompareSimple(version1, version2)

 	switch {
 	case operator == ">" || operator == "gt":
 		return compare > 0
 	case operator == ">=" || operator == "ge":
 		return compare >= 0
 	case operator == "<=" || operator == "le":
 		return compare <= 0
 	case operator == "==" || operator == "=" || operator == "eq":
 		return compare == 0
 	case operator == "<>" || operator == "!=" || operator == "ne":
 		return compare != 0
 	case operator == "" || operator == "<" || operator == "lt":
 		return compare < 0
 	}

 	return false
 }

 // Compares two normalizated version number strings
 //
 // Just the same of CompareVersion but return a int result, 0 if both version
 // are equal, 1 if the right side is bigger and -1 if the right side is lower
 //
 // Usage
 //     version.CompareSimple("1.2", "1.0.1")
 //     Returns: 1
 //
 //     version.CompareSimple("1.0rc1", "1.0")
 //     Returns: -1
 func CompareSimple(version1, version2 string) int {
 	var x, r, l int = 0, 0, 0

 	v1, v2 := prepVersion(version1), prepVersion(version2)
 	len1, len2 := len(v1), len(v2)

 	if len1 > len2 {
 		x = len1
 	} else {
 		x = len2
 	}

 	for i := 0; i < x; i++ {
 		if i < len1 && i < len2 {
 			if v1[i] == v2[i] {
 				continue
 			}
 		}

 		r = 0
 		if i < len1 {
 			r = numVersion(v1[i])
 		}

 		l = 0
 		if i < len2 {
 			l = numVersion(v2[i])
 		}

 		if r < l {
 			return -1
 		} else if r > l {
 			return 1
 		}
 	}

 	return 0
 }

 func prepVersion(version string) []string {
 	if len(version) == 0 {
 		return []string{""}
 	}

 	version = regexpSigns.ReplaceAllString(version, ".")
 	version = regexpDotBeforeDigit.ReplaceAllString(version, ".$1.")
 	version = regexpMultipleDots.ReplaceAllString(version, ".")

 	return strings.Split(version, ".")
 }

 func numVersion(value string) int {
 	if value == "" {
 		return 0
 	}

 	if number, err := strconv.Atoi(value); err == nil {
 		return number
 	}

 	if special, ok := specialForms[value]; ok {
 		return special
 	}

 	return unknownForm
 }

 func ValidSimpleVersionFormat(value string) bool {
 	normalized := Normalize(value)
 	for _, component := range prepVersion(normalized) {
 		if numVersion(component) == unknownForm {
 			return false
 		}
 	}
 	return true
 }
--- a/vendor/github.com/mcuadros/go-version/constraint.go
+++ b/vendor/github.com/mcuadros/go-version/constraint.go
@@ -1,49 +0,0 @@
 package version

 import (
 	"strings"
 )

 type Constraint struct {
 	operator string
 	version  string
 }

 // Return a new Constrain and sets operator and version to compare
 func NewConstrain(operator, version string) *Constraint {
 	constraint := new(Constraint)
 	constraint.SetOperator(operator)
 	constraint.SetVersion(version)

 	return constraint
 }

 // Sets operator to compare
 func (self *Constraint) SetOperator(operator string) {
 	self.operator = operator
 }

 // Get operator to compare
 func (self *Constraint) GetOperator() string {
 	return self.operator
 }

 // Sets version to compare
 func (self *Constraint) SetVersion(version string) {
 	self.version = version
 }

 // Get version to compare
 func (self *Constraint) GetVersion() string {
 	return self.version
 }

 // Match a given version againts the constraint
 func (self *Constraint) Match(version string) bool {
 	return Compare(version, self.version, self.operator)
 }

 // Return a string representation
 func (self *Constraint) String() string {
 	return strings.Trim(self.operator+" "+self.version, " ")
 }
--- a/vendor/github.com/mcuadros/go-version/doc.go
+++ b/vendor/github.com/mcuadros/go-version/doc.go
@@ -1,6 +0,0 @@
 /*
 Version normalizer and comparison library for go, heavy based on PHP 
 version_compare function and Version comparsion libs from Composer 
 (https://github.com/composer/composer) PHP project
 */
 package version
--- a/vendor/github.com/mcuadros/go-version/group.go
+++ b/vendor/github.com/mcuadros/go-version/group.go
@@ -1,300 +0,0 @@
 package version

 import (
 	"regexp"
 	"strconv"
 	"strings"
 	"sync"
 )

 type ConstraintGroup struct {
 	constraints []*Constraint
 }

 // Return a new NewConstrainGroup
 func NewConstrainGroup() *ConstraintGroup {
 	group := new(ConstraintGroup)

 	return group
 }

 // Return a new NewConstrainGroup and create the constraints based on a string
 //
 // Version constraints can be specified in a few different ways:
 //
 // Exact version: You can specify the exact version of a package, for 
 // example 1.0.2.
 //
 // Range: By using comparison operators you can specify ranges of valid versions. 
 // Valid operators are >, >=, <, <=, !=. An example range would be >=1.0. You can 
 // define multiple ranges, separated by a comma: >=1.0,<2.0.
 // 
 // Wildcard: You can specify a pattern with a * wildcard. 1.0.* is the equivalent 
 // of >=1.0,<1.1.
 //
 // Next Significant Release (Tilde Operator): The ~ operator is best explained by 
 // example: ~1.2 is equivalent to >=1.2,<2.0, while ~1.2.3 is equivalent to 
 // >=1.2.3,<1.3. As you can see it is mostly useful for projects respecting 
 // semantic versioning. A common usage would be to mark the minimum minor 
 // version you depend on, like ~1.2 (which allows anything up to, but not 
 // including, 2.0). Since in theory there should be no backwards compatibility 
 // breaks until 2.0, that works well. Another way of looking at it is that 
 // using ~ specifies a minimum version, but allows the last digit specified 
 // to go up.
 //
 // By default only stable releases are taken into consideration. If you would like 
 // to also get RC, beta, alpha or dev versions of your dependencies you can do so 
 // using stability flags. To change that for all packages instead of doing per 
 // dependency you can also use the minimum-stability setting.
 // 
 // From: http://getcomposer.org/doc/01-basic-usage.md#package-versions
 func NewConstrainGroupFromString(name string) *ConstraintGroup {
 	group := new(ConstraintGroup)
 	group.fromString(name)

 	return group
 }

 // Adds a Contraint to the group
 func (self *ConstraintGroup) AddConstraint(constraint ...*Constraint) {
 	if self.constraints == nil {
 		self.constraints = make([]*Constraint, 0)
 	}

 	self.constraints = append(self.constraints, constraint...)
 }

 // Return all the constraints
 func (self *ConstraintGroup) GetConstraints() []*Constraint {
 	return self.constraints
 }

 // Match a given version againts the group
 //
 // Usage
 //     c := version.NewConstrainGroupFromString(">2.0,<=3.0")
 //     c.Match("2.5.0beta")
 //     Returns: true
 //
 //     c := version.NewConstrainGroupFromString("~1.2.3")
 //     c.Match("1.2.3.5")
 //     Returns: true
 func (self *ConstraintGroup) Match(version string) bool {
 	for _, constraint := range self.constraints {
 		if constraint.Match(version) == false {
 			return false
 		}
 	}

 	return true
 }

 func (self *ConstraintGroup) fromString(constraint string) bool {
 	result := RegFind(`(?i)^([^,\s]*?)@(stable|RC|beta|alpha|dev)$`, constraint)
 	if result != nil {
 		constraint = result[1]
 		if constraint == "" {
 			constraint = "*"
 		}
 	}

 	result = RegFind(`(?i)^(dev-[^,\s@]+?|[^,\s@]+?\.x-dev)#.+$`, constraint)
 	if result != nil {
 		if result[1] != "" {
 			constraint = result[1]
 		}
 	}

 	constraints := RegSplit(`\s*,\s*`, strings.Trim(constraint, " "))

 	if len(constraints) > 1 {
 		for _, part := range constraints {
 			self.AddConstraint(self.parseConstraint(part)...)
 		}

 		return true
 	}

 	self.AddConstraint(self.parseConstraint(constraints[0])...)

 	return true
 }

 func (self *ConstraintGroup) parseConstraint(constraint string) []*Constraint {

 	stabilityModifier := ""

 	result := RegFind(`(?i)^([^,\s]+?)@(stable|RC|beta|alpha|dev)$`, constraint)
 	if result != nil {
 		constraint = result[1]
 		if result[2] != "stable" {
 			stabilityModifier = result[2]
 		}
 	}

 	result = RegFind(`^[x*](\.[x*])*$`, constraint)
 	if result != nil {
 		return make([]*Constraint, 0)
 	}

 	highVersion := ""
 	lowVersion := ""

 	result = RegFind(`(?i)^~(\d+)(?:\.(\d+))?(?:\.(\d+))?(?:\.(\d+))?`+modifierRegex+`?$`, constraint)
 	if result != nil {
 		if len(result) > 4 && result[4] != "" {
 			last, _ := strconv.Atoi(result[3])
 			highVersion = result[1] + "." + result[2] + "." + strconv.Itoa(last+1) + ".0-dev"
 			lowVersion = result[1] + "." + result[2] + "." + result[3] + "." + result[4]
 		} else if len(result) > 3 && result[3] != "" {
 			last, _ := strconv.Atoi(result[2])
 			highVersion = result[1] + "." + strconv.Itoa(last+1) + ".0.0-dev"
 			lowVersion = result[1] + "." + result[2] + "." + result[3] + ".0"
 		} else {
 			last, _ := strconv.Atoi(result[1])
 			highVersion = strconv.Itoa(last+1) + ".0.0.0-dev"
 			if len(result) > 2 && result[2] != "" {
 				lowVersion = result[1] + "." + result[2] + ".0.0"
 			} else {
 				lowVersion = result[1] + ".0.0.0"
 			}
 		}

 		if len(result) > 5 && result[5] != "" {
 			lowVersion = lowVersion + "-" + expandStability(result[5])

 		}

 		if len(result) > 6 && result[6] != "" {
 			lowVersion = lowVersion + result[6]
 		}

 		if len(result) > 7 && result[7] != "" {
 			lowVersion = lowVersion + "-dev"
 		}

 		return []*Constraint{
 			{">=", lowVersion},
 			{"<", highVersion},
 		}
 	}

 	result = RegFind(`^(\d+)(?:\.(\d+))?(?:\.(\d+))?\.[x*]$`, constraint)
 	if result != nil {
 		if len(result) > 3 && result[3] != "" {
 			highVersion = result[1] + "." + result[2] + "." + result[3] + ".9999999"
 			if result[3] == "0" {
 				last, _ := strconv.Atoi(result[2])
 				lowVersion = result[1] + "." + strconv.Itoa(last-1) + ".9999999.9999999"
 			} else {
 				last, _ := strconv.Atoi(result[3])
 				lowVersion = result[1] + "." + result[2] + "." + strconv.Itoa(last-1) + ".9999999"
 			}

 		} else if len(result) > 2 && result[2] != "" {
 			highVersion = result[1] + "." + result[2] + ".9999999.9999999"
 			if result[2] == "0" {
 				last, _ := strconv.Atoi(result[1])
 				lowVersion = strconv.Itoa(last-1) + ".9999999.9999999.9999999"
 			} else {
 				last, _ := strconv.Atoi(result[2])
 				lowVersion = result[1] + "." + strconv.Itoa(last-1) + ".9999999.9999999"
 			}

 		} else {
 			highVersion = result[1] + ".9999999.9999999.9999999"
 			if result[1] == "0" {
 				return []*Constraint{{"<", highVersion}}
 			} else {
 				last, _ := strconv.Atoi(result[1])
 				lowVersion = strconv.Itoa(last-1) + ".9999999.9999999.9999999"
 			}
 		}

 		return []*Constraint{
 			{">", lowVersion},
 			{"<", highVersion},
 		}
 	}

 	// match operators constraints
 	result = RegFind(`^(<>|!=|>=?|<=?|==?)?\s*(.*)`, constraint)
 	if result != nil {
 		version := Normalize(result[2])

 		if stabilityModifier != "" && parseStability(version) == "stable" {
 			version = version + "-" + stabilityModifier
 		} else if result[1] == "<" {
 			match := RegFind(`(?i)-stable$`, result[2])
 			if match == nil {
 				version = version + "-dev"
 			}
 		}

 		if len(result) > 1 && result[1] != "" {
 			return []*Constraint{{result[1], version}}
 		} else {
 			return []*Constraint{{"=", version}}

 		}
 	}

 	return []*Constraint{{constraint, stabilityModifier}}
 }

 // PCRegMap : PreCompiled Regex Map
 type PCRegMap struct {
 	sync.RWMutex
 	m map[string]*regexp.Regexp
 }

 // MustCompile : to replace regexp.MustCompile in RegFind.
 func (p *PCRegMap) MustCompile(pattern string) *regexp.Regexp {
 	p.RLock()
 	ret, exist := p.m[pattern]
 	p.RUnlock()
 	if exist {
 		return ret
 	}
 	ret = regexp.MustCompile(pattern)
 	p.Lock()
 	p.m[pattern] = ret
 	p.Unlock()
 	return ret
 }

 var (
 	regexpCache *PCRegMap
 )

 func init() {
 	regexpCache = new(PCRegMap)
 	regexpCache.m = make(map[string]*regexp.Regexp)
 }

 func RegFind(pattern, subject string) []string {
 	reg := regexpCache.MustCompile(pattern)
 	matched := reg.FindAllStringSubmatch(subject, -1)

 	if matched != nil {
 		return matched[0]
 	}

 	return nil
 }

 func RegSplit(pattern, subject string) []string {
 	reg := regexp.MustCompile(pattern)
 	indexes := reg.FindAllStringIndex(subject, -1)

 	laststart := 0
 	result := make([]string, len(indexes)+1)

 	for i, element := range indexes {
 		result[i] = subject[laststart:element[0]]
 		laststart = element[1]
 	}

 	result[len(indexes)] = subject[laststart:len(subject)]
 	return result
 }
--- a/vendor/github.com/mcuadros/go-version/normalize.go
+++ b/vendor/github.com/mcuadros/go-version/normalize.go
@@ -1,116 +0,0 @@
 package version

 import (
 	"regexp"
 	"strings"
 )

 var modifierRegex = `[._-]?(?:(stable|beta|b|RC|alpha|a|patch|pl|p)(?:[.-]?(\d+))?)?([.-]?dev)?`

 var regexpMasterLikeBranches = regexp.MustCompile(`^(?:dev-)?(?:master|trunk|default)$`)
 var regexpBranchNormalize = regexp.MustCompile(`(?i)^v?(\d+)(\.(?:\d+|[x*]))?(\.(?:\d+|[x*]))?(\.(?:\d+|[x*]))?$`)

 // Normalizes a version string to be able to perform comparisons on it
 //
 // Example:
 //     version.Normalize("10.4.13-b")
 //     Returns: 10.4.13.0-beta
 //
 func Normalize(version string) string {

 	// ignore aliases and just assume the alias is required instead of the source
 	result := RegFind(`^([^,\s]+) +as +([^,\s]+)$`, version)
 	if result != nil {
 		version = result[1]
 	}

 	// match master-like branches
 	if regexpMasterLikeBranches.MatchString(strings.ToLower(version)) {
 		return "9999999-dev"
 	}

 	if strings.HasPrefix(strings.ToLower(version), "dev-") {
 		return "dev-" + version[4:len(version)]
 	}

 	index := 0

 	// match classical versioning
 	result = RegFind(`(?i)^v?(\d{1,3})(\.\d+)?(\.\d+)?(\.\d+)?`+modifierRegex+`$`, version)
 	if result != nil {
 		version = ""
 		for _, val := range result[1:5] {
 			if val != "" {
 				version = version + val
 			} else {
 				version = version + ".0"
 			}
 		}

 		index = 5
 	} else {
 		// match date-based versioning
 		result = RegFind(`(?i)^v?(\d{4}(?:[.:-]?\d{2}){1,6}(?:[.:-]?\d{1,3})?)`+modifierRegex+`$`, version)
 		if result != nil {
 			version = regexp.MustCompile(`\D`).ReplaceAllString(result[1], "-")
 			index = 2
 		}
 	}

 	if index != 0 {
 		if result[index] != "" {
 			if result[index] == "stable" {
 				return version
 			}

 			version = version + "-" + expandStability(result[index])
 			if result[index+1] != "" {
 				version = version + result[index+1]
 			}
 		}

 		if result[index+2] != "" {
 			version = version + "-dev"
 		}

 		return version
 	}

 	result = RegFind(`(?i)(.*?)[.-]?dev$`, version)
 	if result != nil {
 		return normalizeBranch(result[1])
 	}

 	return version
 }

 func normalizeBranch(name string) string {
 	name = strings.Trim(name, " ")

 	if name == "master" || name == "trunk" || name == "default" {
 		return Normalize(name)
 	}

 	replace := strings.NewReplacer("*", "9999999", "x", "9999999")

 	matched := regexpBranchNormalize.FindAllStringSubmatch(name, -1)
 	if matched != nil {
 		name = ""
 		for _, val := range matched[0][1:5] {
 			if val != "" {
 				name = name + replace.Replace(val)
 			} else {
 				name = name + ".9999999"
 			}
 		}

 		return name + "-dev"

 	}

 	if strings.HasSuffix(strings.ToLower(name), "-dev") {
 		return name
 	}

 	return "dev-" + name
 }
--- a/vendor/github.com/mcuadros/go-version/sort.go
+++ b/vendor/github.com/mcuadros/go-version/sort.go
@@ -1,36 +0,0 @@
 package version

 import (
 	"sort"
 )

 // Sorts a string slice of version number strings using version.CompareSimple()
 //
 // Example:
 //     version.Sort([]string{"1.10-dev", "1.0rc1", "1.0", "1.0-dev"})
 //     Returns []string{"1.0-dev", "1.0rc1", "1.0", "1.10-dev"}
 //
 func Sort(versionStrings []string) {
 	versions := versionSlice(versionStrings)
 	sort.Sort(versions)
 }

 type versionSlice []string

 func (s versionSlice) Len() int {
 	return len(s)
 }

 func (s versionSlice) Less(i, j int) bool {
 	cmp := CompareSimple(Normalize(s[i]), Normalize(s[j]))
 	if cmp == 0 {
 		return s[i] < s[j]
 	}
 	return cmp < 0
 }

 func (s versionSlice) Swap(i, j int) {
 	tmp := s[j]
 	s[j] = s[i]
 	s[i] = tmp
 }
--- a/vendor/github.com/mcuadros/go-version/stability.go
+++ b/vendor/github.com/mcuadros/go-version/stability.go
@@ -1,83 +0,0 @@
 package version

 import (
 	"regexp"
 	"strings"
 )

 const (
 	Development = iota
 	Alpha
 	Beta
 	RC
 	Stable
 )

 func expandStability(stability string) string {
 	stability = strings.ToLower(stability)

 	switch stability {
 	case "a":
 		return "alpha"
 	case "b":
 		return "beta"
 	case "p":
 		return "patch"
 	case "pl":
 		return "patch"
 	case "rc":
 		return "RC"
 	}

 	return stability
 }

 func parseStability(version string) string {
 	version = regexp.MustCompile(`(?i)#.+$`).ReplaceAllString(version, " ")
 	version = strings.ToLower(version)

 	if strings.HasPrefix(version, "dev-") || strings.HasSuffix(version, "-dev") {
 		return "dev"
 	}

 	result := RegFind(`(?i)^v?(\d{1,3})(\.\d+)?(\.\d+)?(\.\d+)?`+modifierRegex+`$`, version)
 	if result != nil {
 		if len(result) > 3 {
 			return "dev"
 		}
 	}

 	if result[1] != "" {
 		if "beta" == result[1] || "b" == result[1] {
 			return "beta"
 		}
 		if "alpha" == result[1] || "a" == result[1] {
 			return "alpha"
 		}
 		if "rc" == result[1] {
 			return "RC"
 		}
 	}

 	return "stable"
 }

 func GetStability(version string) int {
 	result := RegFind(`(?i)(stable|RC|beta|alpha|dev)`, Normalize(version))
 	if len(result) == 0 {
 		return Stable
 	}

 	switch result[1] {
 	case "dev":
 		return Development
 	case "alpha":
 		return Alpha
 	case "beta":
 		return Beta
 	case "RC":
 		return RC
 	}

 	return Stable
 }
--- a/vendor/modules.txt
+++ b/vendor/modules.txt
@@ -423,6 +423,9 @@ github.com/hashicorp/go-cleanhttp
 # github.com/hashicorp/go-retryablehttp v0.6.6
 ## explicit
 github.com/hashicorp/go-retryablehttp
 # github.com/hashicorp/go-version v1.2.1
 ## explicit
 github.com/hashicorp/go-version
 # github.com/hashicorp/hcl v1.0.0
 github.com/hashicorp/hcl
 github.com/hashicorp/hcl/hcl/ast
@@ -547,9 +550,6 @@ github.com/mattn/go-runewidth
 github.com/mattn/go-sqlite3
 # github.com/matttproud/golang_protobuf_extensions v1.0.1
 github.com/matttproud/golang_protobuf_extensions/pbutil
 # github.com/mcuadros/go-version v0.0.0-20190308113854-92cdf37c5b75
 ## explicit
 github.com/mcuadros/go-version
 # github.com/mgechev/dots v0.0.0-20190921121421-c36f7dcfbb81
 ## explicit
 github.com/mgechev/dots