[Libguestfs] working with mount-local

Hi. I'm try to use guestfish inside golang (extract some files from image and create squashfs from root). Now i can't understand how can i work with mount-local/mount-local-run. Where i can specify what partition i'm export to local? Does i need firstly mount /dev/sda1 to / for example and after that run mount-local /tmp/xxx ? Second - i'm work with guestfish via writing to stdin and getting result from stdout. In case of mount-local-run does i need fully fork new binary or i can only dup stdin descriptor and work with it? -- Vasiliy Tolstov, e-mail: v.tolstov(a)selfip.ru jabber: vase(a)selfip.ru