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image.go
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image.go
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/*
// Copyright (c) 2016 Intel Corporation
//
// 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 (
"sync"
"github.com/golang/glog"
)
type imageStats struct {
done chan struct{}
minSizeMB int
err error
}
var imagesMap struct {
sync.Mutex
images map[string]*imageStats
}
func init() {
imagesMap.images = make(map[string]*imageStats)
}
// Originally this was supposed to be a generic
// feature which could be used by any virtualisation technology. However, since
// we currently only support QEMU and docker and docker doesn't have a way to
// set disk quotas on the rootfs, this feature is only used by QEMU, hence the
// qemu parameter. In the future we might add imageInfo back to the virtualiser
// interface.
func getMinImageSize(vm *qemuV, imagePath string) (minSizeMB int, err error) {
imagesMap.Lock()
info := imagesMap.images[imagePath]
if info == nil {
info = &imageStats{
done: make(chan struct{}),
minSizeMB: -1,
}
imagesMap.images[imagePath] = info
imagesMap.Unlock()
info.minSizeMB, info.err = vm.imageInfo(imagePath)
glog.Infof("Min image size of %s = %d", imagePath, info.minSizeMB)
close(info.done)
} else {
imagesMap.Unlock()
<-info.done
}
return info.minSizeMB, info.err
}