github.com/jfrazelle/docker@v1.1.2-0.20210712172922-bf78e25fe508/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  	"github.com/sirupsen/logrus"
     7  )
     8  
     9  // GetContainerLayerSize returns the real size & virtual size of the container.
    10  func (i *ImageService) GetContainerLayerSize(containerID string) (int64, int64) {
    11  	var (
    12  		sizeRw, sizeRootfs int64
    13  		err                error
    14  	)
    15  
    16  	// Safe to index by runtime.GOOS as Unix hosts don't support multiple
    17  	// container operating systems.
    18  	rwlayer, err := i.layerStore.GetRWLayer(containerID)
    19  	if err != nil {
    20  		logrus.Errorf("Failed to compute size of container rootfs %v: %v", containerID, err)
    21  		return sizeRw, sizeRootfs
    22  	}
    23  	defer i.layerStore.ReleaseRWLayer(rwlayer)
    24  
    25  	sizeRw, err = rwlayer.Size()
    26  	if err != nil {
    27  		logrus.Errorf("Driver %s couldn't return diff size of container %s: %s",
    28  			i.layerStore.DriverName(), containerID, err)
    29  		// FIXME: GetSize should return an error. Not changing it now in case
    30  		// there is a side-effect.
    31  		sizeRw = -1
    32  	}
    33  
    34  	if parent := rwlayer.Parent(); parent != nil {
    35  		sizeRootfs, err = parent.Size()
    36  		if err != nil {
    37  			sizeRootfs = -1
    38  		} else if sizeRw != -1 {
    39  			sizeRootfs += sizeRw
    40  		}
    41  	}
    42  	return sizeRw, sizeRootfs
    43  }