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cl.go
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cl.go
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package main
// An interactive client for 9P servers.
import (
"bufio"
"flag"
"fmt"
"io"
"k8s.io/minikube/third_party/go9p/p"
"k8s.io/minikube/third_party/go9p/p/clnt"
"os"
"path"
"strings"
)
var addr = flag.String("addr", "127.0.0.1:5640", "network address")
var ouser = flag.String("user", "", "user to connect as")
var cmdfile = flag.String("file", "", "read commands from file")
var prompt = flag.String("prompt", "9p> ", "prompt for interactive client")
var debug = flag.Bool("d", false, "enable debugging (fcalls)")
var debugall = flag.Bool("D", false, "enable debugging (raw packets)")
var cwd = "/"
var cfid *clnt.Fid
type Cmd struct {
fun func(c *clnt.Clnt, s []string)
help string
}
var cmds map[string]*Cmd
func init() {
cmds = make(map[string]*Cmd)
cmds["write"] = &Cmd{cmdwrite, "write file string [...]\t«write the unmodified string to file, create file if necessary»"}
cmds["echo"] = &Cmd{cmdecho, "echo file string [...]\t«echo string to file (newline appended)»"}
cmds["stat"] = &Cmd{cmdstat, "stat file [...]\t«stat file»"}
cmds["ls"] = &Cmd{cmdls, "ls [-l] file [...]\t«list contents of directory or file»"}
cmds["cd"] = &Cmd{cmdcd, "cd dir\t«change working directory»"}
cmds["cat"] = &Cmd{cmdcat, "cat file [...]\t«print the contents of file»"}
cmds["mkdir"] = &Cmd{cmdmkdir, "mkdir dir [...]\t«create dir on remote server»"}
cmds["get"] = &Cmd{cmdget, "get file [local]\t«get file from remote server»"}
cmds["put"] = &Cmd{cmdput, "put file [remote]\t«put file on the remote server as 'file'»"}
cmds["pwd"] = &Cmd{cmdpwd, "pwd\t«print working directory»"}
cmds["rm"] = &Cmd{cmdrm, "rm file [...]\t«remove file from remote server»"}
cmds["help"] = &Cmd{cmdhelp, "help [cmd]\t«print available commands or help on cmd»"}
cmds["quit"] = &Cmd{cmdquit, "quit\t«exit»"}
cmds["exit"] = &Cmd{cmdquit, "exit\t«quit»"}
}
// normalize user-supplied path. path starting with '/' is left untouched, otherwise is considered
// local from cwd
func normpath(s string) string {
if len(s) > 0 {
if s[0] == '/' {
return path.Clean(s)
}
return path.Clean(cwd + "/" + s)
}
return "/"
}
func b(mode uint32, s uint8) string {
var bits = []string{"---", "--x", "-w-", "-wx", "r--", "r-x", "rw-", "rwx"}
return bits[(mode>>s)&7]
}
// Convert file mode bits to string representation
func modetostr(mode uint32) string {
d := "-"
if mode&p.DMDIR != 0 {
d = "d"
} else if mode&p.DMAPPEND != 0 {
d = "a"
}
return fmt.Sprintf("%s%s%s%s", d, b(mode, 6), b(mode, 3), b(mode, 0))
}
// Write the string s to remote file f. Create f if it doesn't exist
func writeone(c *clnt.Clnt, f, s string) {
fname := normpath(f)
file, oserr := c.FCreate(fname, 0666, p.OWRITE)
if oserr != nil {
file, oserr = c.FOpen(fname, p.OWRITE|p.OTRUNC)
if oserr != nil {
fmt.Fprintf(os.Stderr, "error opening %s: %v\n", fname, oserr)
return
}
}
defer file.Close()
m, oserr := file.Write([]byte(s))
if oserr != nil {
fmt.Fprintf(os.Stderr, "error writing to %s: %v\n", fname, oserr)
return
}
if m != len(s) {
fmt.Fprintf(os.Stderr, "short write %s\n", fname)
return
}
}
// Write s[1:] (with appended spaces) to the file s[0]
func cmdwrite(c *clnt.Clnt, s []string) {
fname := normpath(s[0])
str := strings.Join(s[1:], " ")
writeone(c, fname, str)
}
// Echo (append newline) s[1:] to s[0]
func cmdecho(c *clnt.Clnt, s []string) {
fname := normpath(s[0])
str := strings.Join(s[1:], " ") + "\n"
writeone(c, fname, str)
}
// Stat the remote file f
func statone(c *clnt.Clnt, f string) {
fname := normpath(f)
stat, oserr := c.FStat(fname)
if oserr != nil {
fmt.Fprintf(os.Stderr, "error in stat %s: %v\n", fname, oserr)
return
}
fmt.Fprintf(os.Stdout, "%s\n", stat)
}
func cmdstat(c *clnt.Clnt, s []string) {
for _, f := range s {
statone(c, normpath(f))
}
}
func dirtostr(d *p.Dir) string {
return fmt.Sprintf("%s %s %s %-8d\t\t%s", modetostr(d.Mode), d.Uid, d.Gid, d.Length, d.Name)
}
func lsone(c *clnt.Clnt, s string, long bool) {
st, oserr := c.FStat(normpath(s))
if oserr != nil {
fmt.Fprintf(os.Stderr, "error stat: %v\n", oserr)
return
}
if st.Mode&p.DMDIR != 0 {
file, oserr := c.FOpen(s, p.OREAD)
if oserr != nil {
fmt.Fprintf(os.Stderr, "error opening dir: %s\n", oserr)
return
}
defer file.Close()
for {
d, oserr := file.Readdir(0)
if oserr != nil {
fmt.Fprintf(os.Stderr, "error reading dir: %v\n", oserr)
}
if d == nil || len(d) == 0 {
break
}
for _, dir := range d {
if long {
fmt.Fprintf(os.Stdout, "%s\n", dirtostr(dir))
} else {
os.Stdout.WriteString(dir.Name + "\n")
}
}
}
} else {
fmt.Fprintf(os.Stdout, "%s\n", dirtostr(st))
}
}
func cmdls(c *clnt.Clnt, s []string) {
long := false
if len(s) > 0 && s[0] == "-l" {
long = true
s = s[1:]
}
if len(s) == 0 {
lsone(c, cwd, long)
} else {
for _, d := range s {
lsone(c, cwd+d, long)
}
}
}
func walkone(c *clnt.Clnt, s string, fileok bool) {
ncwd := normpath(s)
fid, err := c.FWalk(ncwd)
defer c.Clunk(fid)
if err != nil {
fmt.Fprintf(os.Stderr, "walk error: %s\n", err)
return
}
if fileok != true && (fid.Type&p.QTDIR == 0) {
fmt.Fprintf(os.Stderr, "can't cd to file [%s]\n", ncwd)
return
}
cwd = ncwd
}
func cmdcd(c *clnt.Clnt, s []string) {
if s != nil {
walkone(c, strings.Join(s, "/"), false)
}
}
// Print the contents of f
func cmdcat(c *clnt.Clnt, s []string) {
buf := make([]byte, 8192)
Outer:
for _, f := range s {
fname := normpath(f)
file, oserr := c.FOpen(fname, p.OREAD)
if oserr != nil {
fmt.Fprintf(os.Stderr, "error opening %s: %v\n", f, oserr)
continue Outer
}
defer file.Close()
for {
n, oserr := file.Read(buf)
if oserr != nil && oserr != io.EOF {
fmt.Fprintf(os.Stderr, "error reading %s: %v\n", f, oserr)
}
if n == 0 {
break
}
os.Stdout.Write(buf[0:n])
}
}
}
// Create a single directory on remote server
func mkone(c *clnt.Clnt, s string) {
fname := normpath(s)
file, oserr := c.FCreate(fname, 0777|p.DMDIR, p.OWRITE)
if oserr != nil {
fmt.Fprintf(os.Stderr, "error creating directory %s: %v\n", fname, oserr)
return
}
file.Close()
}
// Create directories on remote server
func cmdmkdir(c *clnt.Clnt, s []string) {
for _, f := range s {
mkone(c, f)
}
}
// Copy a remote file to local filesystem
func cmdget(c *clnt.Clnt, s []string) {
var from, to string
switch len(s) {
case 1:
from = normpath(s[0])
_, to = path.Split(s[0])
case 2:
from, to = normpath(s[0]), s[1]
default:
fmt.Fprintf(os.Stderr, "from arguments; usage: get from to\n")
}
tofile, err := os.Create(to)
if err != nil {
fmt.Fprintf(os.Stderr, "error opening %s for writing: %s\n", to, err)
return
}
defer tofile.Close()
file, ferr := c.FOpen(from, p.OREAD)
if ferr != nil {
fmt.Fprintf(os.Stderr, "error opening %s for writing: %s\n", to, err)
return
}
defer file.Close()
buf := make([]byte, 8192)
for {
n, oserr := file.Read(buf)
if oserr != nil {
fmt.Fprintf(os.Stderr, "error reading %s: %s\n", from, oserr)
return
}
if n == 0 {
break
}
m, err := tofile.Write(buf[0:n])
if err != nil {
fmt.Fprintf(os.Stderr, "error writing %s: %s\n", to, err)
return
}
if m != n {
fmt.Fprintf(os.Stderr, "short write %s\n", to)
return
}
}
}
// Copy a local file to remote server
func cmdput(c *clnt.Clnt, s []string) {
var from, to string
switch len(s) {
case 1:
_, to = path.Split(s[0])
to = normpath(to)
from = s[0]
case 2:
from, to = s[0], normpath(s[1])
default:
fmt.Fprintf(os.Stderr, "incorrect arguments; usage: put local [remote]\n")
}
fromfile, err := os.Open(from)
if err != nil {
fmt.Fprintf(os.Stderr, "error opening %s for reading: %s\n", from, err)
return
}
defer fromfile.Close()
file, ferr := c.FOpen(to, p.OWRITE|p.OTRUNC)
if ferr != nil {
file, ferr = c.FCreate(to, 0666, p.OWRITE)
if ferr != nil {
fmt.Fprintf(os.Stderr, "error opening %s for writing: %s\n", to, err)
return
}
}
defer file.Close()
buf := make([]byte, 8192)
for {
n, oserr := fromfile.Read(buf)
if oserr != nil && oserr != io.EOF {
fmt.Fprintf(os.Stderr, "error reading %s: %s\n", from, oserr)
return
}
if n == 0 {
break
}
m, oserr := file.Write(buf[0:n])
if oserr != nil {
fmt.Fprintf(os.Stderr, "error writing %s: %v\n", to, oserr)
return
}
if m != n {
fmt.Fprintf(os.Stderr, "short write %s\n", to)
return
}
}
}
func cmdpwd(c *clnt.Clnt, s []string) { fmt.Fprintf(os.Stdout, cwd+"\n") }
// Remove f from remote server
func rmone(c *clnt.Clnt, f string) {
fname := normpath(f)
err := c.FRemove(fname)
if err != nil {
fmt.Fprintf(os.Stderr, "error in stat %s", err)
return
}
}
// Remove one or more files from the server
func cmdrm(c *clnt.Clnt, s []string) {
for _, f := range s {
rmone(c, normpath(f))
}
}
// Print available commands
func cmdhelp(c *clnt.Clnt, s []string) {
cmdstr := ""
if len(s) > 0 {
for _, h := range s {
v, ok := cmds[h]
if ok {
cmdstr = cmdstr + v.help + "\n"
} else {
cmdstr = cmdstr + "unknown command: " + h + "\n"
}
}
} else {
cmdstr = "available commands: "
for k := range cmds {
cmdstr = cmdstr + " " + k
}
cmdstr = cmdstr + "\n"
}
fmt.Fprintf(os.Stdout, "%s", cmdstr)
}
func cmdquit(c *clnt.Clnt, s []string) { os.Exit(0) }
func cmd(c *clnt.Clnt, cmd string) {
ncmd := strings.Fields(cmd)
if len(ncmd) <= 0 {
return
}
v, ok := cmds[ncmd[0]]
if ok == false {
fmt.Fprintf(os.Stderr, "unknown command: %s\n", ncmd[0])
return
}
v.fun(c, ncmd[1:])
return
}
func interactive(c *clnt.Clnt) {
reader := bufio.NewReaderSize(os.Stdin, 8192)
for {
fmt.Print(*prompt)
line, err := reader.ReadSlice('\n')
if err != nil {
fmt.Fprintf(os.Stderr, "exiting...\n")
break
}
str := strings.TrimSpace(string(line))
// TODO: handle larger input lines by doubling buffer
in := strings.Split(str, "\n")
for i := range in {
if len(in[i]) > 0 {
cmd(c, in[i])
}
}
}
}
func main() {
var user p.User
var err error
var c *clnt.Clnt
var file *clnt.File
flag.Parse()
if *ouser == "" {
user = p.OsUsers.Uid2User(os.Geteuid())
} else {
user = p.OsUsers.Uname2User(*ouser)
}
naddr := *addr
if strings.LastIndex(naddr, ":") == -1 {
naddr = naddr + ":5640"
}
c, err = clnt.Mount("tcp", naddr, "", user)
if err != nil {
fmt.Fprintf(os.Stderr, "error mounting %s: %s\n", naddr, err)
os.Exit(1)
}
if *debug {
c.Debuglevel = 1
}
if *debugall {
c.Debuglevel = 2
}
walkone(c, "/", false)
if file != nil {
//process(c)
fmt.Sprint(os.Stderr, "file reading unimplemented\n")
} else if flag.NArg() > 0 {
flags := flag.Args()
for _, uc := range flags {
cmd(c, uc)
}
} else {
interactive(c)
}
return
}