On 13 September 2016 at 08:08, <S.Jaritz@esa-grimma.de> wrote:
>
> ??? do_fetch_append () {
> ???        extract ${S}/example.tar.gz
> ??? }


> ??? do_install () {
> ???        copy ${S}/ ${D}/opt/
> ??? }


It's a tarball so use "tar" to extract, and you'll need to mkdir ${D}/opt
before copying. but that's barely just pseudocode.

The only gotcha is that do_fetch() is a Python function so you can't just
append shell code.  Simply move the extract into do_install().

Ross