forked from Silverfish/proton-bridge
107 lines
2.8 KiB
Go
107 lines
2.8 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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package app
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import (
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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/allan-simon/go-singleinstance"
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"github.com/hashicorp/go-multierror"
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"github.com/pkg/errors"
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"github.com/sirupsen/logrus"
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)
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func migrateOldVersions() (allErrors error) {
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cacheDir, cacheError := os.UserCacheDir()
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if cacheError != nil {
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allErrors = multierror.Append(allErrors, errors.Wrap(cacheError, "cannot get os cache"))
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return // not need to continue for now (with more migrations might be still ok to continue)
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}
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if err := killV2AppAndRemoveV2LockFiles(filepath.Join(cacheDir, "protonmail", "bridge", "bridge.lock")); err != nil {
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allErrors = multierror.Append(allErrors, errors.Wrap(err, "cannot migrate lockfiles"))
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}
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return
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}
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func killV2AppAndRemoveV2LockFiles(lockFilePathV2 string) error {
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l := logrus.WithField("path", lockFilePathV2)
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if _, err := os.Stat(lockFilePathV2); os.IsNotExist(err) {
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l.Debug("no v2 lockfile")
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return nil
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}
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lock, err := singleinstance.CreateLockFile(lockFilePathV2)
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if err == nil {
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l.Debug("no other v2 instance is running")
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if errClose := lock.Close(); errClose != nil {
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l.WithError(errClose).Error("Cannot close lock file")
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}
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return os.Remove(lockFilePathV2)
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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(lockFilePathV2)
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if err != nil {
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return errors.Wrap(err, "cannot get v2 pid")
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}
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if err := killPID(pid); err != nil {
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return errors.Wrapf(err, "cannot kill v2 app (PID %d)", pid)
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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 nil
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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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func killPID(pid int) error {
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p, err := os.FindProcess(pid)
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if err != nil {
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return err
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}
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return p.Kill()
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}
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