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main_netcat.go
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main_netcat.go
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package main
import (
"fmt"
"io"
"net"
"os"
"sync"
"github.com/lxc/lxd/shared"
"github.com/lxc/lxd/shared/eagain"
)
// Netcat is called with:
//
// lxd netcat /path/to/unix/socket
//
// and does unbuffered netcatting of to socket to stdin/stdout. Any arguments
// after the path to the unix socket are ignored, so that this can be passed
// directly to rsync as the sync command.
func cmdNetcat(args *Args) error {
if len(args.Params) < 2 {
return fmt.Errorf("Bad arguments %q", args.Params)
}
logPath := shared.LogPath(args.Params[1], "netcat.log")
if shared.PathExists(logPath) {
os.Remove(logPath)
}
logFile, err := os.OpenFile(logPath, os.O_WRONLY|os.O_CREATE|os.O_SYNC, 0644)
if err != nil {
return err
}
defer logFile.Close()
uAddr, err := net.ResolveUnixAddr("unix", args.Params[0])
if err != nil {
logFile.WriteString(fmt.Sprintf("Could not resolve unix domain socket \"%s\": %s.\n", args.Params[0], err))
return err
}
conn, err := net.DialUnix("unix", nil, uAddr)
if err != nil {
logFile.WriteString(fmt.Sprintf("Could not dial unix domain socket \"%s\": %s.\n", args.Params[0], err))
return err
}
wg := sync.WaitGroup{}
wg.Add(1)
go func() {
_, err := io.Copy(eagain.Writer{Writer: os.Stdout}, eagain.Reader{Reader: conn})
if err != nil {
logFile.WriteString(fmt.Sprintf("Error while copying from stdout to unix domain socket \"%s\": %s.\n", args.Params[0], err))
}
conn.Close()
wg.Done()
}()
go func() {
_, err := io.Copy(eagain.Writer{Writer: conn}, eagain.Reader{Reader: os.Stdin})
if err != nil {
logFile.WriteString(fmt.Sprintf("Error while copying from unix domain socket \"%s\" to stdin: %s.\n", args.Params[0], err))
}
}()
wg.Wait()
return nil
}