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package main
import (
"encoding/json"
"fmt"
"os"
"github.com/containers/storage"
"github.com/containers/storage/pkg/mflag"
)
func layer(flags *mflag.FlagSet, action string, m storage.Store, args []string) int {
matched := []*storage.Layer{}
for _, arg := range args {
if layer, err := m.Layer(arg); err == nil {
matched = append(matched, layer)
}
}
if jsonOutput {
json.NewEncoder(os.Stdout).Encode(matched)
} else {
for _, layer := range matched {
fmt.Printf("ID: %s\n", layer.ID)
for _, u := range layer.UIDMap {
fmt.Printf("UID mapping: (container=%d, host=%d, size=%d)\n", u.ContainerID, u.HostID, u.Size)
}
for _, g := range layer.GIDMap {
fmt.Printf("GID mapping: (container=%d, host=%d, size=%d)\n", g.ContainerID, g.HostID, g.Size)
}
if layer.Parent != "" {
fmt.Printf("Parent: %s\n", layer.Parent)
}
for _, name := range layer.Names {
fmt.Printf("Name: %s\n", name)
}
if layer.ReadOnly {
fmt.Printf("Read Only: true\n")
}
}
}
if len(matched) != len(args) {
return 1
}
return 0
}
func layerParentOwners(flags *mflag.FlagSet, action string, m storage.Store, args []string) int {
matched := []*storage.Layer{}
for _, arg := range args {
if layer, err := m.Layer(arg); err == nil {
matched = append(matched, layer)
}
}
for _, layer := range matched {
uids, gids, err := m.LayerParentOwners(layer.ID)
if err != nil {
fmt.Fprintf(os.Stderr, "LayerParentOwner: %+v\n", err)
return 1
}
if jsonOutput {
mappings := struct {
ID string
UIDs []int
GIDs []int
}{
ID: layer.ID,
UIDs: uids,
GIDs: gids,
}
json.NewEncoder(os.Stdout).Encode(mappings)
} else {
fmt.Printf("ID: %s\n", layer.ID)
if len(uids) > 0 {
fmt.Printf("UIDs: %v\n", uids)
}
if len(gids) > 0 {
fmt.Printf("GIDs: %v\n", gids)
}
}
}
if len(matched) != len(args) {
return 1
}
return 0
}
func init() {
commands = append(commands,
command{
names: []string{"layer"},
optionsHelp: "[options [...]] layerNameOrID [...]",
usage: "Examine a layer",
action: layer,
minArgs: 1,
addFlags: func(flags *mflag.FlagSet, cmd *command) {
flags.BoolVar(&jsonOutput, []string{"-json", "j"}, jsonOutput, "Prefer JSON output")
},
},
command{
names: []string{"layer-parent-owners"},
optionsHelp: "[options [...]] layerNameOrID [...]",
usage: "Compute the set of unmapped parent UIDs and GIDs of the layer",
action: layerParentOwners,
minArgs: 1,
addFlags: func(flags *mflag.FlagSet, cmd *command) {
flags.BoolVar(&jsonOutput, []string{"-json", "j"}, jsonOutput, "Prefer JSON output")
},
},
)
}
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