Add database get command

cmd/database.go

@@ -36,6 +36,7 @@ func init() {
 
 	databaseGroupCmd.AddCommand(
 		NewDatabaseCreateCommand(),
+		NewDatabaseGetCommand(),
 		NewDatabaseRemoveCommand(),
 	)
 }

cmd/database/get.go

@@ -0,0 +1,83 @@
+// 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"
+
+	helpers "github.com/mudler/luet/cmd/helpers"
+	"gopkg.in/yaml.v2"
+
+	. "github.com/mudler/luet/pkg/config"
+
+	"github.com/spf13/cobra"
+)
+
+func NewDatabaseGetCommand() *cobra.Command {
+	var c = &cobra.Command{
+		Use:   "get <package>",
+		Short: "Get a package in the system DB as yaml",
+		Long: `Get a package in the system database in the YAML format:
+
+		$ luet database get system/foo
+
+To return also files:
+		$ luet database get --files system/foo`,
+		Args: cobra.OnlyValidArgs,
+		PreRun: func(cmd *cobra.Command, args []string) {
+			LuetCfg.Viper.BindPFlag("system.database_path", cmd.Flags().Lookup("system-dbpath"))
+			LuetCfg.Viper.BindPFlag("system.rootfs", cmd.Flags().Lookup("system-target"))
+		},
+		Run: func(cmd *cobra.Command, args []string) {
+			showFiles, _ := cmd.Flags().GetBool("files")
+
+			systemDB := LuetCfg.GetSystemDB()
+
+			for _, a := range args {
+				pack, err := helpers.ParsePackageStr(a)
+				if err != nil {
+					continue
+				}
+
+				ps, err := systemDB.FindPackages(pack)
+				if err != nil {
+					continue
+				}
+				for _, p := range ps {
+					y, err := p.Yaml()
+					if err != nil {
+						continue
+					}
+					fmt.Println(string(y))
+					if showFiles {
+						files, err := systemDB.GetPackageFiles(p)
+						if err != nil {
+							continue
+						}
+						b, err := yaml.Marshal(files)
+						if err != nil {
+							continue
+						}
+						fmt.Println("files:\n" + string(b))
+					}
+				}
+			}
+		},
+	}
+	c.Flags().Bool("files", false, "Show package files.")
+
+	return c
+}