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Copy pathops.go
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140 lines (113 loc) · 4.16 KB
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// Copyright 2016-2017 VMware, Inc. All Rights Reserved.
//
// 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.
package main
import (
"errors"
"fmt"
"io"
"os"
"path"
"syscall"
"time"
log "github.com/Sirupsen/logrus"
"github.com/vmware/vic/lib/pprof"
"github.com/vmware/vic/lib/tether"
"github.com/vmware/vic/pkg/dio"
"github.com/vmware/vic/pkg/trace"
)
// pathPrefix is present to allow the various files referenced by tether to be placed
// in specific directories, primarily for testing.
var pathPrefix string
const (
logDir = "var/log/vic"
initLog = "init.log"
)
type operations struct {
tether.BaseOperations
}
func (t *operations) Setup(sink tether.Config) error {
if err := t.BaseOperations.Setup(sink); err != nil {
return err
}
return pprof.StartPprof("vch-init", pprof.VCHInitPort)
}
func (t *operations) Cleanup() error {
return t.BaseOperations.Cleanup()
}
// HandleSessionExit controls the behaviour on session exit - for the tether if the session exiting
// is the primary session (i.e. SessionID matches ExecutorID) then we exit everything.
func (t *operations) HandleSessionExit(config *tether.ExecutorConfig, session *tether.SessionConfig) func() {
defer trace.End(trace.Begin(""))
// trigger a reload to force relaunch
return func() {
// If executor debug is greater than 1 then suppress the relaunch but leave the executor up
// for diagnostics
if config.DebugLevel > 2 {
log.Warnf("Debug is set to %d so squashing relaunch of exited process", config.DebugLevel)
return
}
// incredibly basic throttle
time.Sleep(3 * time.Second)
tthr.Reload()
log.Info("Triggered reload")
}
}
func (t *operations) SetHostname(name string, aliases ...string) error {
// switch the names around so we get the pretty name and not the ID
return t.BaseOperations.SetHostname(aliases[0])
}
func (t *operations) Apply(endpoint *tether.NetworkEndpoint) error {
return t.BaseOperations.Apply(endpoint)
}
// Log will redirect logging to both a file on disk and to stdout for the process
func (t *operations) Log() (io.Writer, error) {
defer trace.End(trace.Begin("operations.Log"))
// make the logging directory
// #nosec: Expect directory permissions to be 0700 or less
os.MkdirAll(path.Join(pathPrefix, logDir), 0755)
logPath := path.Join(pathPrefix, logDir, initLog)
log.Infof("opening %s for debug log", logPath)
// #nosec: Expect file permissions to be 0600 or less
out, err := os.OpenFile(logPath, os.O_RDWR|os.O_CREATE|os.O_APPEND|os.O_SYNC|syscall.O_NOCTTY, 0644)
if err != nil {
detail := fmt.Sprintf("failed to open file port for debug log: %s", err)
log.Error(detail)
return nil, errors.New(detail)
}
return io.MultiWriter(out, os.Stdout), nil
}
// sessionLogWriter returns a writer that will persist the session output
func (t *operations) SessionLog(session *tether.SessionConfig) (dio.DynamicMultiWriter, dio.DynamicMultiWriter, error) {
defer trace.End(trace.Begin("configure session log writer"))
name := session.ID
if name == "" {
name = session.Name
}
logPath := path.Join(pathPrefix, logDir, name+".log")
// open SttyS2 for session logging
log.Infof("opening %s for session logging", logPath)
// #nosec: Expect file permissions to be 0600 or less
f, err := os.OpenFile(logPath, os.O_RDWR|os.O_CREATE|os.O_APPEND|os.O_SYNC|syscall.O_NOCTTY, 0644)
if err != nil {
detail := fmt.Sprintf("failed to open file for session log: %s", err)
log.Error(detail)
return nil, nil, errors.New(detail)
}
// use multi-writer so it goes to both screen and session log
if debugLevel > 0 {
return dio.MultiWriter(f, os.Stdout), dio.MultiWriter(f, os.Stderr), nil
}
// only duplicate stderr
return dio.MultiWriter(f), dio.MultiWriter(f), nil
}