1f0638747b
By default Gitea will always unlink any sockets that are provided using the `LISTEN_FDS` environment variable. This is because it uses this variable to handle passing when it is doing a graceful restart. However, this same mechanism is used by systemd - which explicitly expects that passed in sockets should not be unlinked by the receiving process. This PR adjusts Gitea's graceful restart mechanism to use an additional environment variable which tracks if a listening socket was opened by Gitea - and therefore should be unlinked on shutdown by Gitea. Fix #20490 Co-authored-by: zeripath <art27@cantab.net>
103 lines
2.6 KiB
Go
103 lines
2.6 KiB
Go
// Copyright 2019 The Gitea Authors. All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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// This code is heavily inspired by the archived gofacebook/gracenet/net.go handler
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//go:build !windows
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package graceful
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import (
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"fmt"
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"net"
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"os"
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"os/exec"
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"strconv"
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"strings"
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"sync"
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"syscall"
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)
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var killParent sync.Once
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// KillParent sends the kill signal to the parent process if we are a child
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func KillParent() {
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killParent.Do(func() {
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if GetManager().IsChild() {
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ppid := syscall.Getppid()
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if ppid > 1 {
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_ = syscall.Kill(ppid, syscall.SIGTERM)
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}
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}
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})
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}
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// RestartProcess starts a new process passing it the active listeners. It
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// doesn't fork, but starts a new process using the same environment and
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// arguments as when it was originally started. This allows for a newly
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// deployed binary to be started. It returns the pid of the newly started
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// process when successful.
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func RestartProcess() (int, error) {
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listeners := getActiveListeners()
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// Extract the fds from the listeners.
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files := make([]*os.File, len(listeners))
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for i, l := range listeners {
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var err error
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// Now, all our listeners actually have File() functions so instead of
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// individually casting we just use a hacky interface
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files[i], err = l.(filer).File()
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if err != nil {
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return 0, err
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}
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if unixListener, ok := l.(*net.UnixListener); ok {
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unixListener.SetUnlinkOnClose(false)
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}
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// Remember to close these at the end.
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defer func(i int) {
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_ = files[i].Close()
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}(i)
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}
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// Use the original binary location. This works with symlinks such that if
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// the file it points to has been changed we will use the updated symlink.
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argv0, err := exec.LookPath(os.Args[0])
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if err != nil {
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return 0, err
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}
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// Pass on the environment and replace the old count key with the new one.
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var env []string
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for _, v := range os.Environ() {
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if !strings.HasPrefix(v, listenFDs+"=") {
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env = append(env, v)
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}
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}
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env = append(env, fmt.Sprintf("%s=%d", listenFDs, len(listeners)))
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sb := &strings.Builder{}
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for i, unlink := range getActiveListenersToUnlink() {
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if !unlink {
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continue
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}
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_, _ = sb.WriteString(strconv.Itoa(i))
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_, _ = sb.WriteString(",")
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}
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unlinkStr := sb.String()
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if len(unlinkStr) > 0 {
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unlinkStr = unlinkStr[:len(unlinkStr)-1]
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env = append(env, fmt.Sprintf("%s=%s", unlinkFDs, unlinkStr))
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}
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allFiles := append([]*os.File{os.Stdin, os.Stdout, os.Stderr}, files...)
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process, err := os.StartProcess(argv0, os.Args, &os.ProcAttr{
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Dir: originalWD,
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Env: env,
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Files: allFiles,
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})
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if err != nil {
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return 0, err
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}
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return process.Pid, nil
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}
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