feat: Added new subcommand remove to commmad kraft pkg

Signed-off-by: Md Sahil <mohdssahil1@gmail.com>

cmd/kraft/pkg/pkg.go

@@ -26,6 +26,7 @@ import (
 	"kraftkit.sh/cmd/kraft/pkg/list"
 	"kraftkit.sh/cmd/kraft/pkg/pull"
 	"kraftkit.sh/cmd/kraft/pkg/push"
+	"kraftkit.sh/cmd/kraft/pkg/remove"
 	"kraftkit.sh/cmd/kraft/pkg/source"
 	"kraftkit.sh/cmd/kraft/pkg/unsource"
 	"kraftkit.sh/cmd/kraft/pkg/update"
@@ -80,6 +81,7 @@ func New() *cobra.Command {
 	cmd.AddCommand(source.New())
 	cmd.AddCommand(unsource.New())
 	cmd.AddCommand(update.New())
+	cmd.AddCommand(remove.New())
 
 	return cmd
 }

cmd/kraft/pkg/remove/remove.go

@@ -0,0 +1,85 @@
+package remove
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/spf13/cobra"
+	"kraftkit.sh/cmdfactory"
+	"kraftkit.sh/packmanager"
+	"kraftkit.sh/unikraft/app"
+)
+
+type Remove struct {
+	Workdir   string `long:"workdir" short:"w" usage:"workdir location to remove pkg from that location"`
+	Kraftfile string `long:"kraftfile" usage:"Set an alternative path of the Kraftfile"`
+}
+
+func New() *cobra.Command {
+	cmd, err := cmdfactory.New(&Remove{}, cobra.Command{
+		Short: "Remove unikraft library from the project directory",
+		Use:   "remove [FLAGS] [PACKAGE|DIR]",
+		Annotations: map[string]string{
+			cmdfactory.AnnotationHelpGroup: "pkg",
+		},
+	})
+	if err != nil {
+		panic(err)
+	}
+
+	return cmd
+}
+
+func (opts *Remove) Pre(cmd *cobra.Command, _ []string) error {
+	ctx := cmd.Context()
+	pm, err := packmanager.NewUmbrellaManager(ctx)
+	if err != nil {
+		return err
+	}
+
+	cmd.SetContext(packmanager.WithPackageManager(ctx, pm))
+
+	return nil
+}
+
+func (opts *Remove) Run(cmd *cobra.Command, args []string) error {
+	if len(args) == 0 {
+		return fmt.Errorf("Package Name is not specified to remove from the project.")
+	}
+	var workdir string
+	var err error
+
+	if len(args) > 1 {
+		workdir = args[1]
+	} else {
+		workdir = opts.Workdir
+	}
+
+	if workdir == "." || workdir == "" {
+		workdir, err = os.Getwd()
+	}
+	if err != nil {
+		return err
+	}
+	ctx := cmd.Context()
+
+	popts := []app.ProjectOption{}
+
+	if len(opts.Kraftfile) > 0 {
+		popts = append(popts, app.WithProjectKraftfile(opts.Kraftfile))
+	} else {
+		popts = append(popts, app.WithProjectDefaultKraftfiles())
+	}
+
+	project, err := app.NewProjectFromOptions(
+		ctx,
+		append(popts, app.WithProjectWorkdir(workdir))...,
+	)
+	if err != nil {
+		return err
+	}
+
+	project.RemoveLibrary(ctx, args[0])
+
+	return project.Save()
+}

unikraft/app/application.go

@@ -123,6 +123,18 @@ type Application interface {
 
 	// Serialize and save the application to the kraftfile
 	Save() error
+
+	// Removes library from the project directory with the help
+	// of given name and version by user.
+	RemoveLibrary(ctx context.Context, libraryName string) error
+}
+
+type MinimalKraftfile struct {
+	Specification string                            `yaml:"specification"`
+	Name          string                            `yaml:"name"`
+	Unikraft      map[string]interface{}            `yaml:"unikraft"`
+	Targets       []map[string]interface{}          `yaml:"targets"`
+	Libraries     map[string]map[string]interface{} `yaml:"libraries"`
 }
 
 type application struct {
@@ -784,3 +796,49 @@ func (app application) Save() error {
 
 	return nil
 }
+
+func (app application) RemoveLibrary(ctx context.Context, libraryNameAndVersion string) error {
+	nameAndVersion := strings.Split(libraryNameAndVersion, ":")
+	nameAndVersion[0] = strings.ToLower(nameAndVersion[0])
+	version := "stable"
+	if len(nameAndVersion) > 1 {
+		version = nameAndVersion[1]
+	}
+
+	for libKey, lib := range app.libraries {
+		if lib.Name() == nameAndVersion[0] && version == lib.Version() {
+			var kraftfileValues MinimalKraftfile
+			yamlFile, err := os.ReadFile(app.kraftfile.path)
+			if err != nil {
+				return err
+			}
+			err = yaml.Unmarshal(yamlFile, &kraftfileValues)
+			if err != nil {
+				return err
+			}
+			delete(app.libraries, libKey)
+			delete(kraftfileValues.Libraries, nameAndVersion[0])
+
+			// Marshal the Node structure back to YAML
+			yaml, err := yaml.Marshal(&kraftfileValues)
+			if err != nil {
+				return err
+			}
+
+			// Write the YAML data to the file
+			err = os.WriteFile(app.kraftfile.path, []byte(yaml), 0o644)
+			if err != nil {
+				return err
+			}
+
+			// Remove library directory from the project directory
+			if _, err = os.Stat(app.WorkingDir() + "/.unikraft/libs/" + nameAndVersion[0]); err == nil {
+				err = os.RemoveAll(app.WorkingDir() + "/.unikraft/libs/" + nameAndVersion[0])
+				if err != nil {
+					return err
+				}
+			}
+		}
+	}
+	return nil
+}