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https://github.com/go-gitea/gitea
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f067e12859
* Only attempt to kill parent once * Apply suggestions from code review Co-Authored-By: guillep2k <18600385+guillep2k@users.noreply.github.com> * Add waitgroup for running servers
85 lines
2.2 KiB
Go
85 lines
2.2 KiB
Go
// +build !windows
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// 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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package graceful
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import (
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"fmt"
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"os"
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"os/exec"
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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 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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// Remember to close these at the end.
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defer files[i].Close()
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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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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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type filer interface {
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File() (*os.File, error)
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}
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