syncthing/cmd/stupgrades/main.go

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// Copyright (C) 2019 The Syncthing Authors.
//
// 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 https://mozilla.org/MPL/2.0/.
package main
import (
"encoding/json"
"flag"
"os"
"sort"
"github.com/syncthing/syncthing/lib/upgrade"
)
const defaultURL = "https://api.github.com/repos/syncthing/syncthing/releases?per_page=25"
func main() {
url := flag.String("u", defaultURL, "GitHub releases url")
flag.Parse()
rels := upgrade.FetchLatestReleases(*url, "")
if rels == nil {
// An error was already logged
os.Exit(1)
}
sort.Sort(upgrade.SortByRelease(rels))
rels = filterForLatest(rels)
if err := json.NewEncoder(os.Stdout).Encode(rels); err != nil {
os.Exit(1)
}
}
// filterForLatest returns the latest stable and prerelease only. If the
// stable version is newer (comes first in the list) there is no need to go
// looking for a prerelease at all.
func filterForLatest(rels []upgrade.Release) []upgrade.Release {
var filtered []upgrade.Release
var havePre bool
for _, rel := range rels {
if !rel.Prerelease {
// We found a stable version, we're good now.
filtered = append(filtered, rel)
break
}
if rel.Prerelease && !havePre {
// We remember the first prerelease we find.
filtered = append(filtered, rel)
havePre = true
}
}
return filtered
}