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server.go
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server.go
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package main
import (
"bufio"
"encoding/gob"
"io"
"os"
"os/exec"
"github.com/calmh/zfs"
)
func server() {
bstdin := bufio.NewReader(os.Stdin)
e := gob.NewEncoder(os.Stdout)
d := gob.NewDecoder(bstdin)
negotiateVersion(e, d)
logf(VERBOSE, "server: starting up\n")
var c Command
for {
err := d.Decode(&c)
if err == io.EOF {
break
}
panicOn(err)
switch c.Command {
case CmdListSnapshots:
logf(DEBUG, "server: listing snapshots\n")
s, _ := zfs.ListSnapshots(c.Params[0])
err = e.Encode(s)
panicOn(err)
case CmdReceive:
logf(DEBUG, "server: zfs recv %v\n", c.Params)
receive(c, e, bstdin)
}
}
}
func receive(c Command, e *gob.Encoder, in io.Reader) {
args := []string{"recv"}
args = append(args, c.Params...)
cmd := exec.Command("zfs", args...)
recvIn, err := cmd.StdinPipe()
panicOn(err)
recvErr, err := cmd.StderrPipe()
panicOn(err)
go printLines("zfs recv: ", recvErr)
recvOut, err := cmd.StdoutPipe()
panicOn(err)
go printLines("zfs recv: ", recvOut)
err = cmd.Start()
panicOn(err)
bufRecvIn := bufio.NewWriterSize(recvIn, opts.bufferBytes)
cr := ChunkedReader{in}
_, err = io.Copy(bufRecvIn, cr)
panicOn(err)
err = bufRecvIn.Flush()
panicOn(err)
err = recvIn.Close()
panicOn(err)
err = cmd.Wait()
panicOn(err)
resp := Command{Command: CmdResult}
err = e.Encode(&resp)
panicOn(err)
}