Add luet box command

It adds only the 'exec' subcommand to spawn processes in custom boxes

Relates to #45

cmd/box.go

@@ -0,0 +1,36 @@
+// Copyright © 2019 Ettore Di Giacinto <mudler@gentoo.org>
+//                  Daniele Rondina <geaaru@sabayonlinux.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
+
+import (
+	. "github.com/mudler/luet/cmd/box"
+
+	"github.com/spf13/cobra"
+)
+
+var boxGroupCmd = &cobra.Command{
+	Use:   "box [command] [OPTIONS]",
+	Short: "Manage luet boxes",
+}
+
+func init() {
+	RootCmd.AddCommand(boxGroupCmd)
+
+	boxGroupCmd.AddCommand(
+		NewBoxExecCommand(),
+	)
+}

cmd/box/exec.go

@@ -0,0 +1,84 @@
+// Copyright © 2019 Ettore Di Giacinto <mudler@gentoo.org>
+//                  Daniele Rondina <geaaru@sabayonlinux.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_box
+
+import (
+	"os"
+
+	b64 "encoding/base64"
+
+	"github.com/mudler/luet/pkg/box"
+	. "github.com/mudler/luet/pkg/logger"
+
+	"github.com/spf13/cobra"
+	"github.com/spf13/viper"
+)
+
+func NewBoxExecCommand() *cobra.Command {
+	var ans = &cobra.Command{
+		Use:   "exec [OPTIONS]",
+		Short: "Execute a binary in a box",
+		Args:  cobra.OnlyValidArgs,
+		PreRun: func(cmd *cobra.Command, args []string) {
+			viper.BindPFlag("stdin", cmd.Flags().Lookup("stdin"))
+			viper.BindPFlag("stdout", cmd.Flags().Lookup("stdout"))
+			viper.BindPFlag("stderr", cmd.Flags().Lookup("stderr"))
+			viper.BindPFlag("rootfs", cmd.Flags().Lookup("rootfs"))
+			viper.BindPFlag("decode", cmd.Flags().Lookup("decode"))
+			viper.BindPFlag("entrypoint", cmd.Flags().Lookup("entrypoint"))
+		},
+		Run: func(cmd *cobra.Command, args []string) {
+			stdin := viper.GetBool("stdin")
+			stdout := viper.GetBool("stdout")
+			stderr := viper.GetBool("stderr")
+			rootfs := viper.GetString("rootfs")
+			base := viper.GetBool("decode")
+
+			entrypoint := viper.GetString("entrypoint")
+			if base {
+				var ss []string
+				for _, a := range args {
+					sDec, _ := b64.StdEncoding.DecodeString(a)
+					ss = append(ss, string(sDec))
+				}
+				//If the command to run is complex,using base64 to avoid bad input
+
+				args = ss
+			}
+			Info("Executing", args, "in", rootfs)
+
+			b := box.NewBox(entrypoint, args, rootfs, stdin, stdout, stderr)
+			err := b.Run()
+			if err != nil {
+				Fatal(err)
+			}
+		},
+	}
+	path, err := os.Getwd()
+	if err != nil {
+		Fatal(err)
+	}
+	ans.Flags().String("rootfs", path, "Rootfs path")
+	ans.Flags().Bool("stdin", false, "Attach to stdin")
+	ans.Flags().Bool("stdout", true, "Attach to stdout")
+	ans.Flags().Bool("stderr", true, "Attach to stderr")
+	ans.Flags().Bool("decode", false, "Base64 decode")
+
+	ans.Flags().String("entrypoint", "/bin/sh", "Entrypoint command (/bin/sh)")
+
+	return ans
+}