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/*
* Copyright (c) 2021 Cisco Systems and/or its affiliates.
* 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.
*/
/*
* Copyright 2016 the Go-FUSE Authors. All rights reserved.
* Use of this source code is governed by a BSD-style
* license that can be found in the LICENSE file.
*/
// This file is the main program driver to mount the stats segment filesystem.
package main
import (
"flag"
"fmt"
"log"
"log/syslog"
"os"
"os/signal"
"runtime"
"strings"
"syscall"
"git.fd.io/govpp.git/adapter/statsclient"
"git.fd.io/govpp.git/core"
"github.com/hanwen/go-fuse/v2/fs"
)
func LogMsg(msg string) {
fmt.Fprint(os.Stderr, msg)
log.Print(msg)
}
func main() {
syslogger, err := syslog.New(syslog.LOG_ERR|syslog.LOG_DAEMON, "statsfs")
if err != nil {
log.Fatalln(err)
}
log.SetOutput(syslogger)
statsSocket := flag.String("socket", statsclient.DefaultSocketName, "Path to VPP stats socket")
debug := flag.Bool("debug", false, "print debugging messages.")
flag.Parse()
if flag.NArg() < 1 {
LogMsg(fmt.Sprintf("usage: %s MOUNTPOINT\n", os.Args[0]))
os.Exit(2)
}
//Conection to the stat segment socket.
sc := statsclient.NewStatsClient(*statsSocket)
fmt.Println("Waiting for the VPP socket to be available. Be sure a VPP instance is running.")
c, err := core.ConnectStats(sc)
if err != nil {
LogMsg(fmt.Sprintf("Failed to connect to the stats socket: %v\n", err))
os.Exit(1)
}
defer c.Disconnect()
fmt.Printf("Connected to the socket\n")
//Creating the filesystem instance
root, err := NewStatsFileSystem(sc)
if err != nil {
LogMsg(fmt.Sprintf("NewStatsFileSystem failed: %v\n", err))
os.Exit(1)
}
//Mounting the filesystem.
opts := &fs.Options{}
opts.Debug = *debug
opts.AllowOther = true
server, err := fs.Mount(flag.Arg(0), root, opts)
if err != nil {
LogMsg(fmt.Sprintf("Mount fail: %v\n", err))
os.Exit(1)
}
sigs := make(chan os.Signal)
signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM)
fmt.Printf("Successfully mounted the file system in directory: %s\n", flag.Arg(0))
runtime.GC()
for {
go server.Wait()
<-sigs
fmt.Println("Unmounting...")
err := server.Unmount()
if err == nil || !strings.Contains(err.Error(), "Device or resource busy") {
break
}
LogMsg(fmt.Sprintf("Unmount fail: %v\n", err))
}
}
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