cmd/list: Implement the list command

Go's text/tabwriter package isn't aware of the ANSI Select Graphic
Rendition (or SGR) escape sequences to change the terminal's
foreground colour [1,2]. Using the sequences disrupt the alignment of
the columns in the tabbed output.

Therefore, unlike the existing POSIX shell implementation, running
containers aren't marked in green in the Go version.

[1] https://en.wikipedia.org/wiki/ANSI_escape_code
[2] https://github.com/golang/go/issues/12073

https://github.com/containers/toolbox/pull/318

src/cmd/list.go

@@ -17,10 +17,14 @@
 package cmd
 
 import (
+	"errors"
 	"fmt"
 	"os"
+	"text/tabwriter"
 
+	"github.com/containers/toolbox/pkg/podman"
 	"github.com/containers/toolbox/pkg/utils"
+	"github.com/sirupsen/logrus"
 	"github.com/spf13/cobra"
 )
 
@@ -57,9 +61,69 @@ func init() {
 }
 
 func list(cmd *cobra.Command, args []string) error {
+	if utils.IsInsideContainer() {
+		if !utils.IsInsideToolboxContainer() {
+			return errors.New("this is not a toolbox container")
+		}
+
+		if _, err := utils.ForwardToHost(); err != nil {
+			return err
+		}
+
+		return nil
+	}
+
+	lsContainers := true
+	lsImages := true
+
+	if !listFlags.onlyContainers && listFlags.onlyImages {
+		lsContainers = false
+	} else if listFlags.onlyContainers && !listFlags.onlyImages {
+		lsImages = false
+	}
+
+	var images []map[string]interface{}
+	var containers []map[string]interface{}
+	var err error
+
+	if lsImages {
+		images, err = listImages()
+		if err != nil {
+			return err
+		}
+	}
+
+	if lsContainers {
+		containers, err = listContainers()
+		if err != nil {
+			return err
+		}
+	}
+
+	listOutput(images, containers)
 	return nil
 }
 
+func listContainers() ([]map[string]interface{}, error) {
+	logrus.Debug("Fetching containers with label=com.redhat.component=fedora-toolbox")
+	args := []string{"--all", "--filter", "label=com.redhat.component=fedora-toolbox"}
+	containers_old, err := podman.GetContainers(args...)
+	if err != nil {
+		return nil, errors.New("failed to list containers with com.redhat.component=fedora-toolbox")
+	}
+
+	logrus.Debug("Fetching containers with label=com.github.debarshiray.toolbox=true")
+	args = []string{"--all", "--filter", "label=com.github.debarshiray.toolbox=true"}
+	containers_new, err := podman.GetContainers(args...)
+	if err != nil {
+		return nil, errors.New("failed to list containers with label=com.github.debarshiray.toolbox=true")
+	}
+
+	containers := utils.JoinJSON("ID", containers_old, containers_new)
+	containers = utils.SortJSON(containers, "Names", false)
+	return containers, nil
+}
+
 func listHelp(cmd *cobra.Command, args []string) {
 	if utils.IsInsideContainer() {
 		if !utils.IsInsideToolboxContainer() {
@@ -80,3 +144,82 @@ func listHelp(cmd *cobra.Command, args []string) {
 		return
 	}
 }
+
+func listImages() ([]map[string]interface{}, error) {
+	logrus.Debug("Fetching images with label=com.redhat.component=fedora-toolbox")
+	args := []string{"--filter", "label=com.redhat.component=fedora-toolbox"}
+	images_old, err := podman.GetImages(args...)
+	if err != nil {
+		return nil, errors.New("failed to list images with com.redhat.component=fedora-toolbox")
+	}
+
+	logrus.Debug("Fetching images with label=com.github.debarshiray.toolbox=true")
+	args = []string{"--filter", "label=com.github.debarshiray.toolbox=true"}
+	images_new, err := podman.GetImages(args...)
+	if err != nil {
+		return nil, errors.New("failed to list images with com.github.debarshiray.toolbox=true")
+	}
+
+	var images []map[string]interface{}
+	if podman.CheckVersion("1.8.3") {
+		images = utils.JoinJSON("ID", images_old, images_new)
+		images = utils.SortJSON(images, "Names", true)
+	} else {
+		images = utils.JoinJSON("id", images_old, images_new)
+		images = utils.SortJSON(images, "names", true)
+	}
+
+	return images, nil
+}
+
+func listOutput(images, containers []map[string]interface{}) {
+	if len(images) != 0 {
+		writer := tabwriter.NewWriter(os.Stdout, 0, 0, 2, ' ', 0)
+		fmt.Fprintf(writer, "%s\t%s\t%s\n", "IMAGE ID", "IMAGE NAME", "CREATED")
+
+		var idKey, nameKey, createdKey string
+		if podman.CheckVersion("1.8.3") {
+			idKey = "ID"
+			nameKey = "Names"
+			createdKey = "Created"
+		} else {
+			idKey = "id"
+			nameKey = "names"
+			createdKey = "created"
+		}
+		for _, image := range images {
+			id := utils.ShortID(image[idKey].(string))
+			name := image[nameKey].([]interface{})[0].(string)
+			created := image[createdKey].(string)
+			fmt.Fprintf(writer, "%s\t%s\t%s\n", id, name, created)
+		}
+
+		writer.Flush()
+	}
+
+	if len(images) != 0 && len(containers) != 0 {
+		fmt.Println()
+	}
+
+	if len(containers) != 0 {
+		writer := tabwriter.NewWriter(os.Stdout, 0, 0, 2, ' ', 0)
+		fmt.Fprintf(writer,
+			"%s\t%s\t%s\t%s\t%s\n",
+			"CONTAINER ID",
+			"CONTAINER NAME",
+			"CREATED",
+			"STATUS",
+			"IMAGE NAME")
+
+		for _, container := range containers {
+			id := container["ID"].(string)[:12]
+			name := container["Names"].(string)
+			created := container["Created"].(string)
+			status := container["Status"].(string)
+			imageName := container["Image"].(string)
+			fmt.Fprintf(writer, "%s\t%s\t%s\t%s\t%s\n", id, name, created, status, imageName)
+		}
+
+		writer.Flush()
+	}
+}