Merge pull request #233 from stokito/exec_shell

Exec shell config

README.md

@@ -84,7 +84,6 @@ Option | Description
 `-s`  | select initial container sort field
 `-scale-cpu`	| show cpu as % of system total
 `-v`	| output version information and exit
-`-shell` | exec shell to use (default: sh)
 
 ### Keybindings
 

config/param.go

@@ -12,11 +12,6 @@ var defaultParams = []*Param{
 		Val:   "state",
 		Label: "Container Sort Field",
 	},
-	&Param{
-		Key:   "shell",
-		Val:   "sh",
-		Label: "Shell",
-	},
 	&Param{
 		Key:   "columns",
 		Val:   "status,name,id,cpu,mem,net,io,pids",

main.go

@@ -46,7 +46,6 @@ func main() {
 		invertFlag      = flag.Bool("i", false, "invert default colors")
 		scaleCpu        = flag.Bool("scale-cpu", false, "show cpu as % of system total")
 		connectorFlag   = flag.String("connector", "docker", "container connector to use")
-		defaultShell    = flag.String("shell", "sh", "exec shell to use")
 	)
 	flag.Parse()
 
@@ -91,10 +90,6 @@ func main() {
 		config.Toggle("scaleCpu")
 	}
 
-	if *defaultShell != "" {
-		config.Update("shell", *defaultShell)
-	}
-
 	// init ui
 	if *invertFlag {
 		InvertColorMap()

menus.go

@@ -358,10 +358,17 @@ func ExecShell() MenuFn {
 
 	ui.DefaultEvtStream.ResetHandlers()
 	defer ui.DefaultEvtStream.ResetHandlers()
-
-	shell := config.Get("shell")
-	if err := c.Exec([]string{shell.Val, "-c", "printf '\\e[0m\\e[?25h' && clear && " + shell.Val}); err != nil {
-		log.Fatal(err)
+	// Detect and execute default shell in container.
+	// Execute Ash shell command: /bin/sh -c
+	// Reset colors: printf '\e[0m\e[?25h'
+	// Clear screen
+	// Run default shell for the user. It's configured in /etc/passwd and looks like root:x:0:0:root:/root:/bin/bash:
+	//  1. Get current user id: id -un
+	//  2. Find user's line in /etc/passwd by grep
+	//  3. Extract default user's shell by cutting seven's column separated by :
+	//  4. Execute the shell path with eval
+	if err := c.Exec([]string{"/bin/sh", "-c", "printf '\\e[0m\\e[?25h' && clear && eval `grep ^$(id -un): /etc/passwd | cut -d : -f 7-`"}); err != nil {
+		log.StatusErr(err)
 	}
 
 	return nil