Add database get-all-installed to show all installed packages (#342)

This command shows all installed packatges in the system directly
without having to query one by one.

It also allows to store the package list into a file

Signed-off-by: Itxaka <itxaka@kairos.io>

cmd/database.go

@@ -38,5 +38,6 @@ func init() {
 		NewDatabaseCreateCommand(),
 		NewDatabaseGetCommand(),
 		NewDatabaseRemoveCommand(),
+		NewDatabaseShowAllCommand(),
 	)
 }

cmd/database/show_all.go

@@ -0,0 +1,68 @@
+// Copyright © 2021 Ettore Di Giacinto <mudler@mocaccino.org>
+//
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 2 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with this program; if not, see <http://www.gnu.org/licenses/>.
+
+package cmd_database
+
+import (
+	"fmt"
+	"github.com/mudler/luet/cmd/util"
+	"github.com/mudler/luet/pkg/api/core/types"
+	"github.com/spf13/cobra"
+	"gopkg.in/yaml.v2"
+	"os"
+)
+
+func NewDatabaseShowAllCommand() *cobra.Command {
+	var c = &cobra.Command{
+		Use:   "get-all-installed",
+		Short: "Show all installed packages in the system DB as yaml",
+		Args:  cobra.NoArgs,
+
+		Run: func(cmd *cobra.Command, args []string) {
+			systemDB := util.SystemDB(util.DefaultContext.Config)
+			var packages []*types.Package
+
+			packs := systemDB.GetPackages()
+			for _, p := range packs {
+				pack, _ := systemDB.GetPackage(p)
+				packages = append(packages, pack)
+			}
+			marshal, err := yaml.Marshal(packages)
+			if err != nil {
+				return
+			}
+			fmt.Println(string(marshal))
+			output, _ := cmd.Flags().GetString("output")
+			f, err := os.Create(output)
+			if err != nil {
+				fmt.Printf("Error creating file: %s\n", err)
+				return
+			}
+			_, err = f.WriteString(string(marshal))
+			if err != nil {
+				fmt.Printf("Error writing file: %s\n", err)
+				return
+			}
+			err = f.Close()
+			if err != nil {
+				fmt.Printf("Error closing file: %s\n", err)
+				return
+			}
+		},
+	}
+
+	c.Flags().String("output", "", "Save output to given file.")
+	return c
+}