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load.go
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load.go
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package unpacker
import (
"bufio"
"encoding/json"
"fmt"
"os"
"path"
"syscall"
"time"
"github.com/Symantec/Dominator/lib/log"
)
const (
dirPerms = syscall.S_IRWXU | syscall.S_IRGRP | syscall.S_IXGRP |
syscall.S_IROTH | syscall.S_IXOTH
)
func load(baseDir string, imageServerAddress string, logger log.DebugLogger) (
*Unpacker, error) {
err := syscall.Mount("none", "/", "", syscall.MS_REC|syscall.MS_PRIVATE, "")
if err != nil {
return nil, fmt.Errorf("error making mounts private: %s", err)
}
if err := os.MkdirAll(path.Join(baseDir, "mnt"), dirPerms); err != nil {
return nil, err
}
u := &Unpacker{
baseDir: baseDir,
imageServerAddress: imageServerAddress,
logger: logger,
}
u.updateUsageTimeWithLock()
file, err := os.Open(path.Join(baseDir, stateFile))
if err != nil {
if os.IsNotExist(err) {
u.pState.Devices = make(map[string]deviceInfo)
u.pState.ImageStreams = make(map[string]*imageStreamInfo)
return u, nil
}
return nil, err
}
defer file.Close()
decoder := json.NewDecoder(bufio.NewReader(file))
if err := decoder.Decode(&u.pState); err != nil {
return nil, err
}
// Fill in sizes.
for deviceName, device := range u.pState.Devices {
if err := updateDeviceSize(&device); err != nil {
return nil, err
}
u.pState.Devices[deviceName] = device
}
// Set up streams.
for streamName := range u.pState.ImageStreams {
if _, err := u.setupStream(streamName); err != nil {
return nil, err
}
}
u.updateUsageTimeWithLock()
return u, nil
}
func (u *Unpacker) updateUsageTime() {
u.rwMutex.Lock()
defer u.rwMutex.Unlock()
u.updateUsageTimeWithLock()
}
func (u *Unpacker) updateUsageTimeWithLock() {
u.lastUsedTime = time.Now()
}