mirror of
https://github.com/ProtonMail/proton-bridge.git
synced 2025-12-13 06:06:44 +00:00
110 lines
3.0 KiB
Go
110 lines
3.0 KiB
Go
// Copyright (c) 2022 Proton AG
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//
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// This file is part of Proton Mail Bridge.
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//
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// Proton Mail Bridge is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Proton Mail Bridge is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Proton Mail Bridge. If not, see <https://www.gnu.org/licenses/>.
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//go:build !windows
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// +build !windows
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package app
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import (
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"fmt"
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"os"
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"path/filepath"
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"strconv"
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"strings"
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"time"
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"github.com/Masterminds/semver/v3"
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"github.com/ProtonMail/proton-bridge/v2/internal/focus"
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"github.com/allan-simon/go-singleinstance"
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"golang.org/x/sys/unix"
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)
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// checkSingleInstance checks if another instance of the application is already running.
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// It tries to create a lock file at the given path.
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// If it succeeds, it returns the lock file and a nil error.
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//
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// For macOS and Linux when already running version is older than this instance
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// it will kill old and continue with this new bridge (i.e. no error returned).
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func checkSingleInstance(lockFilePath string, curVersion *semver.Version) (*os.File, error) {
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if lock, err := singleinstance.CreateLockFile(lockFilePath); err == nil {
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return lock, nil
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}
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// We couldn't create the lock file, so another instance is probably running.
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// Check if it's an older version of the app.
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lastVersion, ok := focus.TryVersion()
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if !ok {
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return nil, fmt.Errorf("failed to determine version of running instance")
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}
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if !lastVersion.LessThan(curVersion) {
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return nil, fmt.Errorf("running instance is newer than this one")
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}
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// The other instance is an older version, so we should kill it.
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pid, err := getPID(lockFilePath)
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if err != nil {
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return nil, err
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}
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if err := unix.Kill(pid, unix.SIGTERM); err != nil {
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return nil, err
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}
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// Need to wait some time to release file lock
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time.Sleep(time.Second)
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return singleinstance.CreateLockFile(lockFilePath)
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}
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func getPID(lockFilePath string) (int, error) {
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file, err := os.Open(filepath.Clean(lockFilePath))
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if err != nil {
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return 0, err
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}
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defer func() { _ = file.Close() }()
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rawPID := make([]byte, 10) // PID is probably up to 7 digits long, 10 should be enough
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n, err := file.Read(rawPID)
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if err != nil {
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return 0, err
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}
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return strconv.Atoi(strings.TrimSpace(string(rawPID[:n])))
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}
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/*
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func runningVersionIsOlder() error {
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currentVer, err := semver.StrictNewVersion(constants.Version)
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if err != nil {
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return err
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}
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runningVer, err := semver.StrictNewVersion(settingsObj.Get(settings.LastVersionKey))
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if err != nil {
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return err
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}
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if !runningVer.LessThan(currentVer) {
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return errors.New("running version is not older")
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}
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return nil
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}
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*/
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