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package main
import (
"fmt"
"github.com/containers/buildah/pkg/formats"
"github.com/containers/libpod/cmd/podman/cliconfig"
"github.com/containers/libpod/pkg/adapter"
"github.com/containers/storage/pkg/archive"
"github.com/pkg/errors"
"github.com/spf13/cobra"
)
type diffJSONOutput struct {
Changed []string `json:"changed,omitempty"`
Added []string `json:"added,omitempty"`
Deleted []string `json:"deleted,omitempty"`
}
type diffOutputParams struct {
Change archive.ChangeType
Path string
}
type stdoutStruct struct {
output []diffOutputParams
}
func (so stdoutStruct) Out() error {
for _, d := range so.output {
fmt.Printf("%s %s\n", d.Change, d.Path)
}
return nil
}
var (
diffCommand cliconfig.DiffValues
diffDescription = fmt.Sprint(`Displays changes on a container or image's filesystem. The container or image will be compared to its parent layer.`)
_diffCommand = &cobra.Command{
Use: "diff [flags] CONTAINER | IMAGE",
Short: "Inspect changes on container's file systems",
Long: diffDescription,
RunE: func(cmd *cobra.Command, args []string) error {
diffCommand.InputArgs = args
diffCommand.GlobalFlags = MainGlobalOpts
diffCommand.Remote = remoteclient
return diffCmd(&diffCommand)
},
Example: `podman diff imageID
podman diff ctrID
podman diff --format json redis:alpine`,
}
)
func init() {
diffCommand.Command = _diffCommand
diffCommand.SetHelpTemplate(HelpTemplate())
diffCommand.SetUsageTemplate(UsageTemplate())
flags := diffCommand.Flags()
flags.BoolVar(&diffCommand.Archive, "archive", true, "Save the diff as a tar archive")
flags.StringVar(&diffCommand.Format, "format", "", "Change the output format")
flags.BoolVarP(&diffCommand.Latest, "latest", "l", false, "Act on the latest container podman is aware of")
markFlagHidden(flags, "archive")
markFlagHiddenForRemoteClient("latest", flags)
}
func formatJSON(output []diffOutputParams) (diffJSONOutput, error) {
jsonStruct := diffJSONOutput{}
for _, output := range output {
switch output.Change {
case archive.ChangeModify:
jsonStruct.Changed = append(jsonStruct.Changed, output.Path)
case archive.ChangeAdd:
jsonStruct.Added = append(jsonStruct.Added, output.Path)
case archive.ChangeDelete:
jsonStruct.Deleted = append(jsonStruct.Deleted, output.Path)
default:
return jsonStruct, errors.Errorf("output kind %q not recognized", output.Change.String())
}
}
return jsonStruct, nil
}
func diffCmd(c *cliconfig.DiffValues) error {
if len(c.InputArgs) != 1 && !c.Latest {
return errors.Errorf("container, image, or layer name must be specified: podman diff [options [...]] ID-NAME")
}
runtime, err := adapter.GetRuntime(getContext(), &c.PodmanCommand)
if err != nil {
return errors.Wrapf(err, "could not get runtime")
}
defer runtime.DeferredShutdown(false)
var to string
if c.Latest {
ctr, err := runtime.GetLatestContainer()
if err != nil {
return errors.Wrapf(err, "unable to get latest container")
}
to = ctr.ID()
} else {
to = c.InputArgs[0]
}
changes, err := runtime.Diff(c, to)
if err != nil {
return errors.Wrapf(err, "could not get changes for %q", to)
}
diffOutput := []diffOutputParams{}
outputFormat := c.Format
for _, change := range changes {
params := diffOutputParams{
Change: change.Kind,
Path: change.Path,
}
diffOutput = append(diffOutput, params)
}
var out formats.Writer
if outputFormat != "" {
switch outputFormat {
case formats.JSONString:
data, err := formatJSON(diffOutput)
if err != nil {
return err
}
out = formats.JSONStruct{Output: data}
default:
return errors.New("only valid format for diff is 'json'")
}
} else {
out = stdoutStruct{output: diffOutput}
}
return formats.Writer(out).Out()
}
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