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Drop local_server support. 

PiperOrigin-RevId: 255713414
This commit is contained in:
Adin Scannell 2019-06-28 20:34:03 -07:00 committed by gVisor bot
parent 45566fa4e4
commit 6d204f6a34
2 changed files with 0 additions and 367 deletions
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14
pkg/p9/local_server/BUILD
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@ -1,14 +0,0 @@
load("@io_bazel_rules_go//go:def.bzl", "go_binary")
package(licenses = ["notice"])
go_binary(
name = "local_server",
srcs = ["local_server.go"],
deps = [
"//pkg/fd",
"//pkg/log",
"//pkg/p9",
"//pkg/unet",
],
)

353
pkg/p9/local_server/local_server.go
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@ -1,353 +0,0 @@
// Copyright 2018 The gVisor Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Binary local_server provides a local 9P2000.L server for the p9 package.
//
// To use, first start the server:
// local_server /tmp/my_bind_addr
//
// Then, connect using the Linux 9P filesystem:
// mount -t 9p -o trans=unix /tmp/my_bind_addr /mnt
//
// This package also serves as an examplar.
package main
import (
"os"
"path"
"syscall"
"gvisor.dev/gvisor/pkg/fd"
"gvisor.dev/gvisor/pkg/log"
"gvisor.dev/gvisor/pkg/p9"
"gvisor.dev/gvisor/pkg/unet"
)
// local wraps a local file.
type local struct {
p9.DefaultWalkGetAttr
path string
file *os.File
}
// info constructs a QID for this file.
func (l *local) info() (p9.QID, os.FileInfo, error) {
var (
qid p9.QID
fi os.FileInfo
err error
)
// Stat the file.
if l.file != nil {
fi, err = l.file.Stat()
} else {
fi, err = os.Lstat(l.path)
}
if err != nil {
log.Warningf("error stating %#v: %v", l, err)
return qid, nil, err
}
// Construct the QID type.
qid.Type = p9.ModeFromOS(fi.Mode()).QIDType()
// Save the path from the Ino.
qid.Path = fi.Sys().(*syscall.Stat_t).Ino
return qid, fi, nil
}
// Attach implements p9.Attacher.Attach.
func (l *local) Attach() (p9.File, error) {
return &local{path: "/"}, nil
}
// Walk implements p9.File.Walk.
func (l *local) Walk(names []string) ([]p9.QID, p9.File, error) {
var qids []p9.QID
last := &local{path: l.path}
for _, name := range names {
c := &local{path: path.Join(last.path, name)}
qid, _, err := c.info()
if err != nil {
return nil, nil, err
}
qids = append(qids, qid)
last = c
}
return qids, last, nil
}
// StatFS implements p9.File.StatFS.
//
// Not implemented.
func (l *local) StatFS() (p9.FSStat, error) {
return p9.FSStat{}, syscall.ENOSYS
}
// FSync implements p9.File.FSync.
func (l *local) FSync() error {
return l.file.Sync()
}
// GetAttr implements p9.File.GetAttr.
//
// Not fully implemented.
func (l *local) GetAttr(req p9.AttrMask) (p9.QID, p9.AttrMask, p9.Attr, error) {
qid, fi, err := l.info()
if err != nil {
return qid, p9.AttrMask{}, p9.Attr{}, err
}
stat := fi.Sys().(*syscall.Stat_t)
attr := p9.Attr{
Mode: p9.FileMode(stat.Mode),
UID: p9.UID(stat.Uid),
GID: p9.GID(stat.Gid),
NLink: stat.Nlink,
RDev: stat.Rdev,
Size: uint64(stat.Size),
BlockSize: uint64(stat.Blksize),
Blocks: uint64(stat.Blocks),
ATimeSeconds: uint64(stat.Atim.Sec),
ATimeNanoSeconds: uint64(stat.Atim.Nsec),
MTimeSeconds: uint64(stat.Mtim.Sec),
MTimeNanoSeconds: uint64(stat.Mtim.Nsec),
CTimeSeconds: uint64(stat.Ctim.Sec),
CTimeNanoSeconds: uint64(stat.Ctim.Nsec),
}
valid := p9.AttrMask{
Mode: true,
UID: true,
GID: true,
NLink: true,
RDev: true,
Size: true,
Blocks: true,
ATime: true,
MTime: true,
CTime: true,
}
return qid, valid, attr, nil
}
// SetAttr implements p9.File.SetAttr.
//
// Not implemented.
func (l *local) SetAttr(valid p9.SetAttrMask, attr p9.SetAttr) error {
return syscall.ENOSYS
}
// Remove implements p9.File.Remove.
//
// Not implemented.
func (l *local) Remove() error {
return syscall.ENOSYS
}
// Rename implements p9.File.Rename.
//
// Not implemented.
func (l *local) Rename(directory p9.File, name string) error {
return syscall.ENOSYS
}
// Close implements p9.File.Close.
func (l *local) Close() error {
if l.file != nil {
return l.file.Close()
}
return nil
}
// Open implements p9.File.Open.
func (l *local) Open(mode p9.OpenFlags) (*fd.FD, p9.QID, uint32, error) {
qid, _, err := l.info()
if err != nil {
return nil, qid, 0, err
}
// Do the actual open.
f, err := os.OpenFile(l.path, int(mode), 0)
if err != nil {
return nil, qid, 0, err
}
l.file = f
// Note: we don't send the local file for this server.
return nil, qid, 4096, nil
}
// Read implements p9.File.Read.
func (l *local) ReadAt(p []byte, offset uint64) (int, error) {
return l.file.ReadAt(p, int64(offset))
}
// Write implements p9.File.Write.
func (l *local) WriteAt(p []byte, offset uint64) (int, error) {
return l.file.WriteAt(p, int64(offset))
}
// Create implements p9.File.Create.
func (l *local) Create(name string, mode p9.OpenFlags, permissions p9.FileMode, _ p9.UID, _ p9.GID) (*fd.FD, p9.File, p9.QID, uint32, error) {
f, err := os.OpenFile(l.path, int(mode)|syscall.O_CREAT|syscall.O_EXCL, os.FileMode(permissions))
if err != nil {
return nil, nil, p9.QID{}, 0, err
}
l2 := &local{path: path.Join(l.path, name), file: f}
qid, _, err := l2.info()
if err != nil {
l2.Close()
return nil, nil, p9.QID{}, 0, err
}
return nil, l2, qid, 4096, nil
}
// Mkdir implements p9.File.Mkdir.
//
// Not properly implemented.
func (l *local) Mkdir(name string, permissions p9.FileMode, _ p9.UID, _ p9.GID) (p9.QID, error) {
if err := os.Mkdir(path.Join(l.path, name), os.FileMode(permissions)); err != nil {
return p9.QID{}, err
}
// Blank QID.
return p9.QID{}, nil
}
// Symlink implements p9.File.Symlink.
//
// Not properly implemented.
func (l *local) Symlink(oldname string, newname string, _ p9.UID, _ p9.GID) (p9.QID, error) {
if err := os.Symlink(oldname, path.Join(l.path, newname)); err != nil {
return p9.QID{}, err
}
// Blank QID.
return p9.QID{}, nil
}
// Link implements p9.File.Link.
//
// Not properly implemented.
func (l *local) Link(target p9.File, newname string) error {
return os.Link(target.(*local).path, path.Join(l.path, newname))
}
// Mknod implements p9.File.Mknod.
//
// Not implemented.
func (l *local) Mknod(name string, mode p9.FileMode, major uint32, minor uint32, _ p9.UID, _ p9.GID) (p9.QID, error) {
return p9.QID{}, syscall.ENOSYS
}
// RenameAt implements p9.File.RenameAt.
//
// Not implemented.
func (l *local) RenameAt(oldname string, newdir p9.File, newname string) error {
return syscall.ENOSYS
}
// UnlinkAt implements p9.File.UnlinkAt.
//
// Not implemented.
func (l *local) UnlinkAt(name string, flags uint32) error {
return syscall.ENOSYS
}
// Readdir implements p9.File.Readdir.
func (l *local) Readdir(offset uint64, count uint32) ([]p9.Dirent, error) {
// We only do *all* dirents in single shot.
const maxDirentBuffer = 1024 * 1024
buf := make([]byte, maxDirentBuffer)
n, err := syscall.ReadDirent(int(l.file.Fd()), buf)
if err != nil {
// Return zero entries.
return nil, nil
}
// Parse the entries; note that we read up to offset+count here.
_, newCount, newNames := syscall.ParseDirent(buf[:n], int(offset)+int(count), nil)
var dirents []p9.Dirent
for i := int(offset); i >= 0 && i < newCount; i++ {
entry := local{path: path.Join(l.path, newNames[i])}
qid, _, err := entry.info()
if err != nil {
continue
}
dirents = append(dirents, p9.Dirent{
QID: qid,
Type: qid.Type,
Name: newNames[i],
Offset: uint64(i + 1),
})
}
return dirents, nil
}
// Readlink implements p9.File.Readlink.
//
// Not properly implemented.
func (l *local) Readlink() (string, error) {
return os.Readlink(l.path)
}
// Flush implements p9.File.Flush.
func (l *local) Flush() error {
return nil
}
// Connect implements p9.File.Connect.
func (l *local) Connect(p9.ConnectFlags) (*fd.FD, error) {
return nil, syscall.ECONNREFUSED
}
// Renamed implements p9.File.Renamed.
func (l *local) Renamed(parent p9.File, newName string) {
l.path = path.Join(parent.(*local).path, newName)
}
// Allocate implements p9.File.Allocate.
func (l *local) Allocate(mode p9.AllocateMode, offset, length uint64) error {
return syscall.Fallocate(int(l.file.Fd()), mode.ToLinux(), int64(offset), int64(length))
}
func main() {
log.SetLevel(log.Debug)
if len(os.Args) != 2 {
log.Warningf("usage: %s <bind-addr>", os.Args[0])
os.Exit(1)
}
// Bind and listen on the socket.
serverSocket, err := unet.BindAndListen(os.Args[1], false)
if err != nil {
log.Warningf("err binding: %v", err)
os.Exit(1)
}
// Run the server.
s := p9.NewServer(&local{})
s.Serve(serverSocket)
}
var (
_ p9.File = &local{}
)