1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
|
package main
import (
"context"
"fmt"
"github.com/containers/libpod/cmd/podman/cliconfig"
"github.com/containers/libpod/libpod/image"
"github.com/containers/libpod/pkg/adapter"
"github.com/docker/go-units"
"github.com/pkg/errors"
"github.com/spf13/cobra"
)
const (
middleItem = "├── "
continueItem = "│ "
lastItem = "└── "
)
var (
treeCommand cliconfig.TreeValues
treeDescription = "Prints layer hierarchy of an image in a tree format"
_treeCommand = &cobra.Command{
Use: "tree [flags] IMAGE",
Short: treeDescription,
Long: treeDescription,
RunE: func(cmd *cobra.Command, args []string) error {
treeCommand.InputArgs = args
treeCommand.GlobalFlags = MainGlobalOpts
treeCommand.Remote = remoteclient
return treeCmd(&treeCommand)
},
Example: "podman image tree alpine:latest",
}
)
func init() {
treeCommand.Command = _treeCommand
treeCommand.SetUsageTemplate(UsageTemplate())
treeCommand.Flags().BoolVar(&treeCommand.WhatRequires, "whatrequires", false, "Show all child images and layers of the specified image")
}
func treeCmd(c *cliconfig.TreeValues) error {
args := c.InputArgs
if len(args) == 0 {
return errors.Errorf("an image name must be specified")
}
if len(args) > 1 {
return errors.Errorf("you must provide at most 1 argument")
}
runtime, err := adapter.GetRuntime(getContext(), &c.PodmanCommand)
if err != nil {
return errors.Wrapf(err, "error creating libpod runtime")
}
defer runtime.Shutdown(false)
imageInfo, layerInfoMap, img, err := runtime.Tree(c)
if err != nil {
return err
}
return printTree(imageInfo, layerInfoMap, img, c.WhatRequires)
}
func printTree(imageInfo *image.InfoImage, layerInfoMap map[string]*image.LayerInfo, img *adapter.ContainerImage, whatRequires bool) error {
size, err := img.Size(context.Background())
if err != nil {
return err
}
fmt.Printf("Image ID: %s\n", imageInfo.ID[:12])
fmt.Printf("Tags:\t %s\n", imageInfo.Tags)
fmt.Printf("Size:\t %v\n", units.HumanSizeWithPrecision(float64(*size), 4))
if img.TopLayer() != "" {
fmt.Printf("Image Layers\n")
} else {
fmt.Printf("No Image Layers\n")
}
if !whatRequires {
// fill imageInfo with layers associated with image.
// the layers will be filled such that
// (Start)RootLayer->...intermediate Parent Layer(s)-> TopLayer(End)
// Build output from imageInfo into buffer
printImageHierarchy(imageInfo)
} else {
// fill imageInfo with layers associated with image.
// the layers will be filled such that
// (Start)TopLayer->...intermediate Child Layer(s)-> Child TopLayer(End)
// (Forks)... intermediate Child Layer(s) -> Child Top Layer(End)
return printImageChildren(layerInfoMap, img.TopLayer(), "", true)
}
return nil
}
// Stores all children layers which are created using given Image.
// Layers are stored as follows
// (Start)TopLayer->...intermediate Child Layer(s)-> Child TopLayer(End)
// (Forks)... intermediate Child Layer(s) -> Child Top Layer(End)
func printImageChildren(layerMap map[string]*image.LayerInfo, layerID string, prefix string, last bool) error {
if layerID == "" {
return nil
}
ll, ok := layerMap[layerID]
if !ok {
return fmt.Errorf("lookup error: layerid %s, not found", layerID)
}
fmt.Printf(prefix)
//initialize intend with middleItem to reduce middleItem checks.
intend := middleItem
if !last {
// add continueItem i.e. '|' for next iteration prefix
prefix = prefix + continueItem
} else if len(ll.ChildID) > 1 || len(ll.ChildID) == 0 {
// The above condition ensure, alignment happens for node, which has more then 1 childern.
// If node is last in printing hierarchy, it should not be printed as middleItem i.e. ├──
intend = lastItem
prefix = prefix + " "
}
var tags string
if len(ll.RepoTags) > 0 {
tags = fmt.Sprintf(" Top Layer of: %s", ll.RepoTags)
}
fmt.Printf("%sID: %s Size: %7v%s\n", intend, ll.ID[:12], units.HumanSizeWithPrecision(float64(ll.Size), 4), tags)
for count, childID := range ll.ChildID {
if err := printImageChildren(layerMap, childID, prefix, count == len(ll.ChildID)-1); err != nil {
return err
}
}
return nil
}
// prints the layers info of image
func printImageHierarchy(imageInfo *image.InfoImage) {
for count, l := range imageInfo.Layers {
var tags string
intend := middleItem
if len(l.RepoTags) > 0 {
tags = fmt.Sprintf(" Top Layer of: %s", l.RepoTags)
}
if count == len(imageInfo.Layers)-1 {
intend = lastItem
}
fmt.Printf("%s ID: %s Size: %7v%s\n", intend, l.ID[:12], units.HumanSizeWithPrecision(float64(l.Size), 4), tags)
}
}
|
