github.com/endocode/docker@v1.4.2-0.20160113120958-46eb4700391e/image/rootfs_windows.go (about)

     1  // +build windows
     2  
     3  package image
     4  
     5  import (
     6  	"crypto/sha512"
     7  	"fmt"
     8  
     9  	"github.com/docker/distribution/digest"
    10  	"github.com/docker/docker/layer"
    11  )
    12  
    13  // RootFS describes images root filesystem
    14  // This is currently a placeholder that only supports layers. In the future
    15  // this can be made into a interface that supports different implementations.
    16  type RootFS struct {
    17  	Type      string         `json:"type"`
    18  	DiffIDs   []layer.DiffID `json:"diff_ids,omitempty"`
    19  	BaseLayer string         `json:"base_layer,omitempty"`
    20  }
    21  
    22  // BaseLayerID returns the 64 byte hex ID for the baselayer name.
    23  func (r *RootFS) BaseLayerID() string {
    24  	baseID := sha512.Sum384([]byte(r.BaseLayer))
    25  	return fmt.Sprintf("%x", baseID[:32])
    26  }
    27  
    28  // ChainID returns the ChainID for the top layer in RootFS.
    29  func (r *RootFS) ChainID() layer.ChainID {
    30  	baseDiffID := digest.FromBytes([]byte(r.BaseLayerID()))
    31  	return layer.CreateChainID(append([]layer.DiffID{layer.DiffID(baseDiffID)}, r.DiffIDs...))
    32  }
    33  
    34  // NewRootFS returns empty RootFS struct
    35  func NewRootFS() *RootFS {
    36  	return &RootFS{Type: "layers+base"}
    37  }