migrate to go-modules

Signed-off-by: Valentin Rothberg <rothberg@redhat.com>

vendor/github.com/fsouza/go-dockerclient/system.go

@@ -0,0 +1,72 @@
+package docker
+
+import (
+	"context"
+	"encoding/json"
+)
+
+// VolumeUsageData represents usage data from the docker system api
+// More Info Here https://dockr.ly/2PNzQyO
+type VolumeUsageData struct {
+
+	// The number of containers referencing this volume. This field
+	// is set to `-1` if the reference-count is not available.
+	//
+	// Required: true
+	RefCount int64 `json:"RefCount"`
+
+	// Amount of disk space used by the volume (in bytes). This information
+	// is only available for volumes created with the `"local"` volume
+	// driver. For volumes created with other volume drivers, this field
+	// is set to `-1` ("not available")
+	//
+	// Required: true
+	Size int64 `json:"Size"`
+}
+
+// ImageSummary represents data about what images are
+// currently known to docker
+// More Info Here https://dockr.ly/2PNzQyO
+type ImageSummary struct {
+	Containers  int64             `json:"Containers"`
+	Created     int64             `json:"Created"`
+	ID          string            `json:"Id"`
+	Labels      map[string]string `json:"Labels"`
+	ParentID    string            `json:"ParentId"`
+	RepoDigests []string          `json:"RepoDigests"`
+	RepoTags    []string          `json:"RepoTags"`
+	SharedSize  int64             `json:"SharedSize"`
+	Size        int64             `json:"Size"`
+	VirtualSize int64             `json:"VirtualSize"`
+}
+
+// DiskUsage holds information about what docker is using disk space on.
+// More Info Here https://dockr.ly/2PNzQyO
+type DiskUsage struct {
+	LayersSize int64
+	Images     []*ImageSummary
+	Containers []*APIContainers
+	Volumes    []*Volume
+}
+
+// DiskUsageOptions only contains a context for canceling.
+type DiskUsageOptions struct {
+	Context context.Context
+}
+
+// DiskUsage returns a *DiskUsage describing what docker is using disk on.
+//
+// More Info Here https://dockr.ly/2PNzQyO
+func (c *Client) DiskUsage(opts DiskUsageOptions) (*DiskUsage, error) {
+	path := "/system/df"
+	resp, err := c.do("GET", path, doOptions{context: opts.Context})
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+	var du *DiskUsage
+	if err := json.NewDecoder(resp.Body).Decode(&du); err != nil {
+		return nil, err
+	}
+	return du, nil
+}