github.com/docker/docker@v299999999.0.0-20200612211812-aaf470eca7b5+incompatible/daemon/images/image_unix.go (about)

     1  // +build linux freebsd
     2  
     3  package images // import "github.com/docker/docker/daemon/images"
     4  
     5  import (
     6  	"runtime"
     7  
     8  	"github.com/sirupsen/logrus"
     9  )
    10  
    11  // GetContainerLayerSize returns the real size & virtual size of the container.
    12  func (i *ImageService) GetContainerLayerSize(containerID string) (int64, int64) {
    13  	var (
    14  		sizeRw, sizeRootfs int64
    15  		err                error
    16  	)
    17  
    18  	// Safe to index by runtime.GOOS as Unix hosts don't support multiple
    19  	// container operating systems.
    20  	rwlayer, err := i.layerStores[runtime.GOOS].GetRWLayer(containerID)
    21  	if err != nil {
    22  		logrus.Errorf("Failed to compute size of container rootfs %v: %v", containerID, err)
    23  		return sizeRw, sizeRootfs
    24  	}
    25  	defer i.layerStores[runtime.GOOS].ReleaseRWLayer(rwlayer)
    26  
    27  	sizeRw, err = rwlayer.Size()
    28  	if err != nil {
    29  		logrus.Errorf("Driver %s couldn't return diff size of container %s: %s",
    30  			i.layerStores[runtime.GOOS].DriverName(), containerID, err)
    31  		// FIXME: GetSize should return an error. Not changing it now in case
    32  		// there is a side-effect.
    33  		sizeRw = -1
    34  	}
    35  
    36  	if parent := rwlayer.Parent(); parent != nil {
    37  		sizeRootfs, err = parent.Size()
    38  		if err != nil {
    39  			sizeRootfs = -1
    40  		} else if sizeRw != -1 {
    41  			sizeRootfs += sizeRw
    42  		}
    43  	}
    44  	return sizeRw, sizeRootfs
    45  }