luet/cmd/box/exec.go

// 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
}