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script.go
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script.go
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package main
import (
"bytes"
"encoding/json"
"io"
"log"
"net"
"os"
"os/exec"
"strconv"
)
const script = `
# see: https://unix.stackexchange.com/questions/146756/forward-sigterm-to-child-in-bash
prep_term()
{
unset term_child_pid
unset term_kill_needed
trap 'handle_term' TERM INT
}
handle_term()
{
if [ "${term_child_pid}" ]; then
kill -TERM "${term_child_pid}" 2>/dev/null
else
term_kill_needed="yes"
fi
}
wait_term()
{
if [ "${term_kill_needed}" ]; then
kill -TERM "${term_child_pid}" 2>/dev/null
fi
wait ${term_child_pid} 2>/dev/null
trap - TERM INT
wait ${term_child_pid} 2>/dev/null
}
start_child()
{
__add_child=1 "$exe" "$@"
}
`
var children []*exec.Cmd
type StartChildRequest struct {
Out, Err uintptr
Dir, Script string
Command []string
}
type StartChildResponse struct {
Pid int
Error string
ExitCode int
}
func initChildClient(port string, script bool, argv ...string) {
var (
servAddr = "localhost:" + port
req = StartChildRequest{Out: os.Stdout.Fd(), Err: os.Stderr.Fd()}
buf bytes.Buffer
err error
)
if req.Dir, err = os.Getwd(); err != nil {
log.Fatalf("Read work directory fail: %v\n", err)
}
if script {
if _, err = io.Copy(&buf, os.Stdin); err != nil {
log.Fatalln("read stdin fail:", err)
os.Exit(1)
}
req.Script = buf.String()
} else {
req.Command = argv
}
tcpAddr, err := net.ResolveTCPAddr("tcp", servAddr)
if err != nil {
log.Fatalln("ResolveTCPAddr failed:", err)
}
conn, err := net.DialTCP("tcp", nil, tcpAddr)
if err != nil {
log.Fatalln("Dial failed:", err)
}
defer conn.Close()
var data []byte
data, err = json.Marshal(req)
if err != nil {
log.Fatalln("Marshall request failed:", err)
}
conn.Write(data)
var resp StartChildResponse
if err = json.NewDecoder(conn).Decode(&resp); err != nil {
log.Fatalln("Decode response failed:", err)
}
os.Stdout.WriteString(strconv.Itoa(resp.Pid) + "\n")
if resp.Error != "" {
os.Stderr.WriteString(resp.Error)
os.Stderr.WriteString("\n")
}
os.Exit(resp.ExitCode)
}
func startChild(conn net.Conn) {
var (
err error
req StartChildRequest
resp StartChildResponse
)
defer conn.Close()
if err = json.NewDecoder(conn).Decode(&req); err != nil {
resp.Error = err.Error()
resp.ExitCode = 1
b, _ := json.Marshal(resp)
conn.Write(b)
return
}
var opt CmdOpt
if len(req.Command) > 0 {
opt.Name, opt.Args = req.Command[0], req.Command[1:]
} else {
opt.Script = req.Script
}
opt.Out = req.Out
opt.Err = req.Err
opt.Dir = req.Dir
child := opt.Create()
if err = cmds.Start(child); err != nil {
resp.Error = err.Error()
resp.ExitCode = 1
b, _ := json.Marshal(resp)
conn.Write(b)
return
}
resp.Pid = child.Process.Pid
b, _ := json.Marshal(resp)
conn.Write(b)
}
func startChildServer() (port string) {
// Listen for incoming connections on random port.
l, err := net.Listen("tcp", "localhost:0")
if err != nil {
log.Fatalf("Error listening: %s\n", err)
}
go func() {
// Close the listener when the application closes.
defer l.Close()
for {
// Listen for an incoming connection.
conn, err := l.Accept()
if err != nil {
log.Printf("START_CHILD_SERVER: accept fail: %s\n", err)
return
}
go startChild(conn)
}
}()
_, port, _ = net.SplitHostPort(l.Addr().String())
return
}