71 lines
2.4 KiB
Go
71 lines
2.4 KiB
Go
// Copyright (c) 2024 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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package app
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import (
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"fmt"
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"os"
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"time"
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"github.com/Masterminds/semver/v3"
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"github.com/ProtonMail/proton-bridge/v3/internal/focus"
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"github.com/allan-simon/go-singleinstance"
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"github.com/sirupsen/logrus"
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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(settingPath, lockFilePath string, curVersion *semver.Version) (*os.File, error) {
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if lock, err := singleinstance.CreateLockFile(lockFilePath); err == nil {
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logrus.WithField("path", lockFilePath).Debug("Created lock file; no other instance is running")
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return lock, nil
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}
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logrus.Warn("Failed to create lock file; another instance is running")
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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(settingPath)
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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 := killPID(pid); 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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