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e81ccc406b
Change all license headers to comply with REUSE specification. Fix #16132 Co-authored-by: flynnnnnnnnnn <flynnnnnnnnnn@github> Co-authored-by: John Olheiser <john.olheiser@gmail.com>
104 lines
2.6 KiB
Go
104 lines
2.6 KiB
Go
// Copyright 2019 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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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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