mv internal lib
This commit is contained in:
Jakob Borg
227
lib/upgrade/upgrade_common.go
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227
lib/upgrade/upgrade_common.go
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// Copyright (C) 2014 The Syncthing Authors.
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//
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// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this file,
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// You can obtain one at http://mozilla.org/MPL/2.0/.
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// Package upgrade downloads and compares releases, and upgrades the running binary.
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package upgrade
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import (
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"errors"
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"fmt"
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"runtime"
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"strconv"
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"strings"
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"github.com/kardianos/osext"
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)
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type Release struct {
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Tag string `json:"tag_name"`
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Prerelease bool `json:"prerelease"`
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Assets []Asset `json:"assets"`
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}
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type Asset struct {
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URL string `json:"url"`
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Name string `json:"name"`
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}
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var (
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ErrVersionUpToDate = errors.New("current version is up to date")
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ErrVersionUnknown = errors.New("couldn't fetch release information")
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ErrUpgradeUnsupported = errors.New("upgrade unsupported")
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ErrUpgradeInProgress = errors.New("upgrade already in progress")
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upgradeUnlocked = make(chan bool, 1)
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)
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func init() {
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upgradeUnlocked <- true
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}
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func To(rel Release) error {
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select {
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case <-upgradeUnlocked:
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path, err := osext.Executable()
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if err != nil {
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upgradeUnlocked <- true
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return err
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}
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err = upgradeTo(path, rel)
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// If we've failed to upgrade, unlock so that another attempt could be made
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if err != nil {
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upgradeUnlocked <- true
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}
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return err
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default:
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return ErrUpgradeInProgress
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}
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}
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func ToURL(url string) error {
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select {
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case <-upgradeUnlocked:
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path, err := osext.Executable()
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if err != nil {
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upgradeUnlocked <- true
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return err
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}
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err = upgradeToURL(path, url)
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// If we've failed to upgrade, unlock so that another attempt could be made
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if err != nil {
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upgradeUnlocked <- true
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}
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return err
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default:
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return ErrUpgradeInProgress
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}
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}
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type Relation int
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const (
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MajorOlder Relation = -2 // Older by a major version (x in x.y.z or 0.x.y).
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Older = -1 // Older by a minor version (y or z in x.y.z, or y in 0.x.y)
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Equal = 0 // Versions are semantically equal
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Newer = 1 // Newer by a minor version (y or z in x.y.z, or y in 0.x.y)
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MajorNewer = 2 // Newer by a major version (x in x.y.z or 0.x.y).
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)
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// CompareVersions returns a relation describing how a compares to b.
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func CompareVersions(a, b string) Relation {
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arel, apre := versionParts(a)
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brel, bpre := versionParts(b)
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minlen := len(arel)
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if l := len(brel); l < minlen {
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minlen = l
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}
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// First compare major-minor-patch versions
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for i := 0; i < minlen; i++ {
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if arel[i] < brel[i] {
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if i == 0 {
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return MajorOlder
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}
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if i == 1 && arel[0] == 0 {
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return MajorOlder
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}
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return Older
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}
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if arel[i] > brel[i] {
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if i == 0 {
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return MajorNewer
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}
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if i == 1 && arel[0] == 0 {
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return MajorNewer
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}
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return Newer
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}
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}
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// Longer version is newer, when the preceding parts are equal
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if len(arel) < len(brel) {
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return Older
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}
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if len(arel) > len(brel) {
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return Newer
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}
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// Prerelease versions are older, if the versions are the same
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if len(apre) == 0 && len(bpre) > 0 {
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return Newer
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}
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if len(apre) > 0 && len(bpre) == 0 {
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return Older
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}
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minlen = len(apre)
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if l := len(bpre); l < minlen {
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minlen = l
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}
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// Compare prerelease strings
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for i := 0; i < minlen; i++ {
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switch av := apre[i].(type) {
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case int:
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switch bv := bpre[i].(type) {
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case int:
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if av < bv {
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return Older
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}
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if av > bv {
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return Newer
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}
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case string:
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return Older
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}
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case string:
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switch bv := bpre[i].(type) {
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case int:
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return Newer
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case string:
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if av < bv {
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return Older
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}
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if av > bv {
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return Newer
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}
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}
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}
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}
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// If all else is equal, longer prerelease string is newer
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if len(apre) < len(bpre) {
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return Older
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}
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if len(apre) > len(bpre) {
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return Newer
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}
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// Looks like they're actually the same
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return Equal
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}
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// Split a version into parts.
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// "1.2.3-beta.2" -> []int{1, 2, 3}, []interface{}{"beta", 2}
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func versionParts(v string) ([]int, []interface{}) {
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if strings.HasPrefix(v, "v") || strings.HasPrefix(v, "V") {
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// Strip initial 'v' or 'V' prefix if present.
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v = v[1:]
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}
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parts := strings.SplitN(v, "+", 2)
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parts = strings.SplitN(parts[0], "-", 2)
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fields := strings.Split(parts[0], ".")
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release := make([]int, len(fields))
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for i, s := range fields {
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v, _ := strconv.Atoi(s)
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release[i] = v
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}
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var prerelease []interface{}
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if len(parts) > 1 {
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fields = strings.Split(parts[1], ".")
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prerelease = make([]interface{}, len(fields))
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for i, s := range fields {
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v, err := strconv.Atoi(s)
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if err == nil {
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prerelease[i] = v
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} else {
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prerelease[i] = s
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}
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}
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}
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return release, prerelease
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}
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func releaseName(tag string) string {
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switch runtime.GOOS {
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case "darwin":
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return fmt.Sprintf("syncthing-macosx-%s-%s.", runtime.GOARCH, tag)
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default:
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return fmt.Sprintf("syncthing-%s-%s-%s.", runtime.GOOS, runtime.GOARCH, tag)
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}
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}
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