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moby--moby/api/client/inspect.go

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package client
import (
"bytes"
"encoding/json"
"fmt"
"io"
"strings"
"text/template"
"github.com/docker/docker/api/types"
flag "github.com/docker/docker/pkg/mflag"
)
// CmdInspect displays low-level information on one or more containers or images.
//
// Usage: docker inspect [OPTIONS] CONTAINER|IMAGE [CONTAINER|IMAGE...]
func (cli *DockerCli) CmdInspect(args ...string) error {
cmd := cli.Subcmd("inspect", []string{"CONTAINER|IMAGE [CONTAINER|IMAGE...]"}, "Return low-level information on a container or image", true)
tmplStr := cmd.String([]string{"f", "#format", "-format"}, "", "Format the output using the given go template")
inspectType := cmd.String([]string{"-type"}, "", "Return JSON for specified type, (e.g image or container)")
cmd.Require(flag.Min, 1)
cmd.ParseFlags(args, true)
var tmpl *template.Template
var err error
var obj []byte
if *tmplStr != "" {
if tmpl, err = template.New("").Funcs(funcMap).Parse(*tmplStr); err != nil {
return StatusError{StatusCode: 64,
Status: "Template parsing error: " + err.Error()}
}
}
if *inspectType != "" && *inspectType != "container" && *inspectType != "image" {
return fmt.Errorf("%q is not a valid value for --type", *inspectType)
}
indented := new(bytes.Buffer)
indented.WriteString("[\n")
status := 0
isImage := false
for _, name := range cmd.Args() {
if *inspectType == "" || *inspectType == "container" {
obj, _, err = readBody(cli.call("GET", "/containers/"+name+"/json", nil, nil))
if err != nil && *inspectType == "container" {
if strings.Contains(err.Error(), "No such") {
fmt.Fprintf(cli.err, "Error: No such container: %s\n", name)
} else {
fmt.Fprintf(cli.err, "%s", err)
}
status = 1
continue
}
}
if obj == nil && (*inspectType == "" || *inspectType == "image") {
obj, _, err = readBody(cli.call("GET", "/images/"+name+"/json", nil, nil))
isImage = true
if err != nil {
if strings.Contains(err.Error(), "No such") {
if *inspectType == "" {
fmt.Fprintf(cli.err, "Error: No such image or container: %s\n", name)
} else {
fmt.Fprintf(cli.err, "Error: No such image: %s\n", name)
}
} else {
fmt.Fprintf(cli.err, "%s", err)
}
status = 1
continue
}
}
if tmpl == nil {
if err := json.Indent(indented, obj, "", " "); err != nil {
fmt.Fprintf(cli.err, "%s\n", err)
status = 1
continue
}
} else {
rdr := bytes.NewReader(obj)
dec := json.NewDecoder(rdr)
if isImage {
inspPtr := types.ImageInspect{}
if err := dec.Decode(&inspPtr); err != nil {
fmt.Fprintf(cli.err, "%s\n", err)
status = 1
continue
}
if err := tmpl.Execute(cli.out, inspPtr); err != nil {
rdr.Seek(0, 0)
var raw interface{}
if err := dec.Decode(&raw); err != nil {
return err
}
if err = tmpl.Execute(cli.out, raw); err != nil {
return err
}
}
} else {
inspPtr := types.ContainerJSON{}
if err := dec.Decode(&inspPtr); err != nil {
fmt.Fprintf(cli.err, "%s\n", err)
status = 1
continue
}
if err := tmpl.Execute(cli.out, inspPtr); err != nil {
rdr.Seek(0, 0)
var raw interface{}
if err := dec.Decode(&raw); err != nil {
return err
}
if err = tmpl.Execute(cli.out, raw); err != nil {
return err
}
}
}
cli.out.Write([]byte{'\n'})
}
indented.WriteString(",")
}
if indented.Len() > 1 {
// Remove trailing ','
indented.Truncate(indented.Len() - 1)
}
indented.WriteString("]\n")
if tmpl == nil {
// Note that we will always write "[]" when "-f" isn't specified,
// to make sure the output would always be array, see
// https://github.com/docker/docker/pull/9500#issuecomment-65846734
if _, err := io.Copy(cli.out, indented); err != nil {
return err
}
}
if status != 0 {
return StatusError{StatusCode: status}
}
return nil
}