cmd/mbf: optionally enter cure container

This is very useful for troubleshooting failing tests and such. The ephemeral state is cleaned up by internal/pkg.

Signed-off-by: Ophestra <cat@gensokyo.uk>

cmd/mbf/main.go

@@ -436,6 +436,7 @@ func main() {
 	{
 		var (
 			flagDump   string
+			flagEnter  bool
 			flagExport string
 		)
 		c.NewCommand(
@@ -445,9 +446,13 @@ func main() {
 				if len(args) != 1 {
 					return errors.New("cure requires 1 argument")
 				}
-				if p, ok := rosa.ResolveName(args[0]); !ok {
+				p, ok := rosa.ResolveName(args[0])
+				if !ok {
 					return fmt.Errorf("unknown artifact %q", args[0])
-				} else if flagDump == "" {
+				}
+
+				switch {
+				default:
 					pathname, _, err := cache.Cure(rosa.Std.Load(p))
 					if err != nil {
 						return err
@@ -477,7 +482,8 @@ func main() {
 					}
 
 					return nil
-				} else {
+
+				case flagDump != "":
 					f, err := os.OpenFile(
 						flagDump,
 						os.O_WRONLY|os.O_CREATE|os.O_EXCL,
@@ -493,6 +499,15 @@ func main() {
 					}
 
 					return f.Close()
+
+				case flagEnter:
+					return cache.EnterExec(
+						ctx,
+						rosa.Std.Load(p),
+						true, os.Stdin, os.Stdout, os.Stderr,
+						rosa.AbsSystem.Append("bin", "mksh"),
+						"sh",
+					)
 				}
 			},
 		).
@@ -505,6 +520,11 @@ func main() {
 				&flagExport,
 				"export", command.StringFlag(""),
 				"Export cured artifact to specified pathname",
+			).
+			Flag(
+				&flagEnter,
+				"enter", command.BoolFlag(false),
+				"Enter cure container with an interactive shell",
 			)
 	}