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cmd/enter: honor user’s configured shell inside toolbox
Signed-off-by: Yann Soubeyrand <github@yann.soubeyrand.eu>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,101 @@ | ||
| /* | ||
| * Copyright © 2022 – 2024 Yann Soubeyrand | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
|
|
||
| package cmd | ||
|
|
||
| import ( | ||
| "errors" | ||
| "fmt" | ||
| "os" | ||
| "os/user" | ||
| "strings" | ||
| "syscall" | ||
|
|
||
| "github.com/containers/toolbox/pkg/utils" | ||
| lcuser "github.com/opencontainers/runc/libcontainer/user" | ||
| "github.com/spf13/cobra" | ||
| ) | ||
|
|
||
| var shCmd = &cobra.Command{ | ||
| Use: "sh", | ||
| Short: "Launch user configured shell inside container", | ||
| Hidden: true, | ||
| RunE: sh, | ||
| } | ||
|
|
||
| func init() { | ||
| shCmd.SetHelpFunc(shHelp) | ||
| rootCmd.AddCommand(shCmd) | ||
| } | ||
|
|
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| func sh(cmd *cobra.Command, args []string) error { | ||
| if !utils.IsInsideContainer() { | ||
| var builder strings.Builder | ||
| fmt.Fprintf(&builder, "the 'sh' command can only be used inside containers\n") | ||
| fmt.Fprintf(&builder, "Run '%s --help' for usage.", executableBase) | ||
|
|
||
| errMsg := builder.String() | ||
| return errors.New(errMsg) | ||
| } | ||
|
|
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| u, err := user.Current() | ||
| if err != nil { | ||
| return fmt.Errorf("failed to get current user: %s", err) | ||
| } | ||
|
|
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| lcu, err := lcuser.LookupUser(u.Username) | ||
| if err != nil { | ||
| return fmt.Errorf("failed to lookup current user shell: %s", err) | ||
| } | ||
|
|
||
| for i, shell := range []string{ | ||
| lcu.Shell, | ||
| "/bin/bash", | ||
| "/bin/sh", | ||
| } { | ||
| if i > 0 { | ||
| fmt.Fprintf(os.Stderr, "Falling back to %q\n", shell) | ||
| } | ||
|
|
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| err = syscall.Exec(shell, args, os.Environ()) | ||
| if err != nil { | ||
| fmt.Fprintf(os.Stderr, "Failed to execute %q: %s\n", shell, err) | ||
| } | ||
| } | ||
|
|
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| return fmt.Errorf("failed to execute a shell") | ||
| } | ||
|
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| func shHelp(cmd *cobra.Command, args []string) { | ||
| if utils.IsInsideContainer() { | ||
| if !utils.IsInsideToolboxContainer() { | ||
| fmt.Fprintf(os.Stderr, "Error: this is not a toolbox container\n") | ||
| return | ||
| } | ||
|
|
||
| if _, err := utils.ForwardToHost(); err != nil { | ||
| fmt.Fprintf(os.Stderr, "Error: %s\n", err) | ||
| return | ||
| } | ||
|
|
||
| return | ||
| } | ||
|
|
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| if err := showManual("toolbox-sh"); err != nil { | ||
| fmt.Fprintf(os.Stderr, "Error: %s\n", err) | ||
| return | ||
| } | ||
| } |
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