internal/outcome: optional shim private dir

This is a private work directory owned by the specific shim. Useful for sockets owned by this instance of the shim and requires no direct assistance from the priv-side process.

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

internal/outcome/dispatcher.go

@@ -53,6 +53,10 @@ type syscallDispatcher interface {
 	readdir(name string) ([]os.DirEntry, error)
 	// tempdir provides [os.TempDir].
 	tempdir() string
+	// mkdir provides [os.Mkdir].
+	mkdir(name string, perm os.FileMode) error
+	// removeAll provides [os.RemoveAll].
+	removeAll(path string) error
 	// exit provides [os.Exit].
 	exit(code int)
 
@@ -121,6 +125,8 @@ func (direct) stat(name string) (os.FileInfo, error)      { return os.Stat(name)
 func (direct) open(name string) (osFile, error)           { return os.Open(name) }
 func (direct) readdir(name string) ([]os.DirEntry, error) { return os.ReadDir(name) }
 func (direct) tempdir() string                            { return os.TempDir() }
+func (direct) mkdir(name string, perm os.FileMode) error  { return os.Mkdir(name, perm) }
+func (direct) removeAll(path string) error                { return os.RemoveAll(path) }
 func (direct) exit(code int)                              { os.Exit(code) }
 
 func (direct) evalSymlinks(path string) (string, error) { return filepath.EvalSymlinks(path) }