forked from docker-archive/go-p9p
/
main.go
343 lines (280 loc) · 6.68 KB
/
main.go
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package main
import (
"bytes"
"flag"
"fmt"
"io"
"log"
"net"
"net/http"
_ "net/http/pprof"
"os"
"path"
"strings"
"text/tabwriter"
"time"
"github.com/chzyer/readline"
"github.com/docker/go-p9p"
"golang.org/x/net/context"
)
var addr string
func init() {
flag.StringVar(&addr, "addr", ":5640", "addr of 9p service")
}
func main() {
go func() {
log.Println(http.ListenAndServe("localhost:6060", nil))
}()
ctx := context.Background()
log.SetFlags(0)
flag.Parse()
proto := "tcp"
if strings.HasPrefix(addr, "unix:") {
proto = "unix"
addr = addr[5:]
}
log.Println("dialing", addr)
conn, err := net.Dial(proto, addr)
if err != nil {
log.Fatal(err)
}
csession, err := p9p.NewSession(ctx, conn)
if err != nil {
log.Fatalln(err)
}
commander := &fsCommander{
ctx: context.Background(),
session: csession,
pwd: "/",
stdout: os.Stdout,
stderr: os.Stderr,
}
completer := readline.NewPrefixCompleter(
readline.PcItem("ls"),
// readline.PcItem("find"),
readline.PcItem("stat"),
readline.PcItem("cat"),
readline.PcItem("cd"),
readline.PcItem("pwd"),
)
rl, err := readline.NewEx(&readline.Config{
HistoryFile: ".history",
AutoComplete: completer,
})
if err != nil {
log.Fatalln(err)
}
commander.readline = rl
msize, version := commander.session.Version()
if err != nil {
log.Fatalln(err)
}
log.Println("9p version", version, msize)
// attach root
commander.nextfid = 1
if _, err := commander.session.Attach(commander.ctx, commander.nextfid, p9p.NOFID, "anyone", "/"); err != nil {
log.Fatalln(err)
}
commander.rootfid = commander.nextfid
commander.nextfid++
// clone the pwd fid so we can clunk it
if _, err := commander.session.Walk(commander.ctx, commander.rootfid, commander.nextfid); err != nil {
log.Fatalln(err)
}
commander.pwdfid = commander.nextfid
commander.nextfid++
for {
commander.readline.SetPrompt(fmt.Sprintf("%s 🐳 > ", commander.pwd))
line, err := rl.Readline()
if err != nil {
log.Fatalln("error: ", err)
}
if line == "" {
continue
}
args := strings.Fields(line)
name := args[0]
var cmd func(ctx context.Context, args ...string) error
switch name {
case "ls":
cmd = commander.cmdls
case "cd":
cmd = commander.cmdcd
case "pwd":
cmd = commander.cmdpwd
case "cat":
cmd = commander.cmdcat
case "stat":
cmd = commander.cmdstat
default:
cmd = func(ctx context.Context, args ...string) error {
return fmt.Errorf("command not implemented")
}
}
ctx, _ = context.WithTimeout(commander.ctx, 5*time.Second)
if err := cmd(ctx, args[1:]...); err != nil {
if err == p9p.ErrClosed {
log.Println("connection closed, shutting down")
return
}
log.Printf("👹 %s: %v", name, err)
}
}
}
type fsCommander struct {
ctx context.Context
session p9p.Session
pwd string
pwdfid p9p.Fid
rootfid p9p.Fid
nextfid p9p.Fid
readline *readline.Instance
stdout io.Writer
stderr io.Writer
}
func (c *fsCommander) cmdls(ctx context.Context, args ...string) error {
ps := []string{c.pwd}
if len(args) > 0 {
ps = args
}
wr := tabwriter.NewWriter(c.stdout, 0, 8, 8, ' ', 0)
for _, p := range ps {
// create a header if have more than one path.
if len(ps) > 1 {
fmt.Fprintln(wr, p+":")
}
if !path.IsAbs(p) {
p = path.Join(c.pwd, p)
}
targetfid := c.nextfid
c.nextfid++
components := strings.Split(strings.Trim(p, "/"), "/")
if _, err := c.session.Walk(ctx, c.rootfid, targetfid, components...); err != nil {
return err
}
defer c.session.Clunk(ctx, targetfid)
_, iounit, err := c.session.Open(ctx, targetfid, p9p.OREAD)
if err != nil {
return err
}
if iounit < 1 {
msize, _ := c.session.Version()
iounit = uint32(msize - 24) // size of message max minus fcall io header (Rread)
}
p := make([]byte, iounit)
n, err := c.session.Read(ctx, targetfid, p, 0)
if err != nil {
return err
}
rd := bytes.NewReader(p[:n])
codec := p9p.NewCodec() // TODO(stevvooe): Need way to resolve codec based on session.
for {
var d p9p.Dir
if err := p9p.DecodeDir(codec, rd, &d); err != nil {
if err == io.EOF {
break
}
return err
}
fmt.Fprintf(wr, "%v\t%v\t%v\t%s\n", os.FileMode(d.Mode), d.Length, d.ModTime, d.Name)
}
if len(ps) > 1 {
fmt.Fprintln(wr, "")
}
}
// all output is dumped only after success.
return wr.Flush()
}
func (c *fsCommander) cmdcd(ctx context.Context, args ...string) error {
var p string
switch len(args) {
case 0:
p = "/"
case 1:
p = args[0]
default:
return fmt.Errorf("cd: invalid args: %v", args)
}
if !path.IsAbs(p) {
p = path.Join(c.pwd, p)
}
targetfid := c.nextfid
c.nextfid++
components := strings.Split(strings.TrimSpace(strings.Trim(p, "/")), "/")
if _, err := c.session.Walk(c.ctx, c.rootfid, targetfid, components...); err != nil {
return err
}
defer c.session.Clunk(c.ctx, c.pwdfid)
log.Println("cd", p, targetfid)
c.pwd = p
c.pwdfid = targetfid
return nil
}
func (c *fsCommander) cmdstat(ctx context.Context, args ...string) error {
ps := []string{c.pwd}
if len(args) > 0 {
ps = args
}
wr := tabwriter.NewWriter(c.stdout, 0, 8, 8, ' ', 0)
for _, p := range ps {
targetfid := c.nextfid
c.nextfid++
components := strings.Split(strings.Trim(p, "/"), "/")
if _, err := c.session.Walk(ctx, c.rootfid, targetfid, components...); err != nil {
return err
}
defer c.session.Clunk(ctx, targetfid)
d, err := c.session.Stat(ctx, targetfid)
if err != nil {
return err
}
fmt.Fprintf(wr, "%v\t%v\t%v\t%s\n", os.FileMode(d.Mode), d.Length, d.ModTime, d.Name)
}
return wr.Flush()
}
func (c *fsCommander) cmdpwd(ctx context.Context, args ...string) error {
if len(args) != 0 {
return fmt.Errorf("pwd takes no arguments")
}
fmt.Println(c.pwd)
return nil
}
func (c *fsCommander) cmdcat(ctx context.Context, args ...string) error {
var p string
switch len(args) {
case 0:
p = "/"
case 1:
p = args[0]
default:
return fmt.Errorf("cd: invalid args: %v", args)
}
if !path.IsAbs(p) {
p = path.Join(c.pwd, p)
}
targetfid := c.nextfid
c.nextfid++
components := strings.Split(strings.TrimSpace(strings.Trim(p, "/")), "/")
if _, err := c.session.Walk(ctx, c.rootfid, targetfid, components...); err != nil {
return err
}
defer c.session.Clunk(ctx, c.pwdfid)
_, iounit, err := c.session.Open(ctx, targetfid, p9p.OREAD)
if err != nil {
return err
}
if iounit < 1 {
msize, _ := c.session.Version()
iounit = uint32(msize - 24) // size of message max minus fcall io header (Rread)
}
b := make([]byte, iounit)
n, err := c.session.Read(ctx, targetfid, b, 0)
if err != nil {
return err
}
if _, err := os.Stdout.Write(b[:n]); err != nil {
return err
}
os.Stdout.Write([]byte("\n"))
return nil
}