LogDog Butler: Catch SIGTERM on Linux.

client/cmd/logdog_butler/main_posix.go

 // Copyright 2015 The LUCI Authors. All rights reserved.
 // Use of this source code is governed under the Apache License, Version 2.0
 // that can be found in the LICENSE file.
 
 // +build darwin dragonfly freebsd linux netbsd openbsd
 
 package main
 
 import (
         "errors"
         "fmt"
+        "os"
+        "syscall"
 
         "github.com/luci/luci-go/client/internal/logdog/butler/streamserver"
         "golang.org/x/net/context"
 )
 
 const (
         // An example stream server URI.
         exampleStreamServerURI = streamServerURI("unix:/var/run/butler.sock")
 )
 
+// interruptSignals is the set of signals to handle gracefully (e.g., flush,
+// shutdown).
+var interruptSignals = []os.Signal{
+        os.Interrupt,
+        syscall.SIGTERM,
+}
+
 type streamServerURI string
 
 func (u streamServerURI) Parse() (string, error) {
         typ, value := parseStreamServer(string(u))
         if typ != "unix" {
                 return "", fmt.Errorf("unsupported URI scheme: [%s]", typ)
         }
         if value == "" {
                 return "", errors.New("empty stream server path")
         }
         return value, nil
 }
 
 // Validates that the URI is correct for Windows.
 func (u streamServerURI) Validate() (err error) {
         _, err = u.Parse()
         return
 }
 
 // Create a POSIX (UNIX named pipe) stream server
 func createStreamServer(ctx context.Context, uri streamServerURI) streamserver.StreamServer {
         path, err := uri.Parse()
         if err != nil {
                 panic("Failed to parse stream server URI.")
         }
         return streamserver.NewNamedPipeServer(ctx, path)
 }