[yocto] THISDIR variable in another meta-layer

[Richard Purdie]

On Fri, 2018-12-14 at 10:26 +0100, Tomasz Michalski wrote:
> Hi
> I have structure of files:
> 
> meta-layer-A
>     recipes-X
>         componentB
>              default
>                  script.sh
>              componentB.bb
> meta-layer-B
>     recipes-X
>         componentB
>              files
>                  script.sh
>              componentB.bbappend
> 
> In componentB.bb I have function do_install:
> do_install () {
>     install -m 0755 -d ${D}/usr/share
>     cmake_do_install
>     install -m 0755 ${THISDIR}/default/script.sh  ${D}/usr/share
> }
> 
> In componentB.bbapend I overwrite function in order to install other
> script instead:
> do_install () {
>     install -m 0755 -d ${D}/usr/share
>     cmake_do_install
>     install -m 0755 ${THISDIR}/files/script.sh  ${D}/usr/share
> }
> 
> 
> The problem is that ${THISDIR} indicates IN BOTH CASES to path meta-
> layer-A/recipes-X/componentB.
> So how to tell bitbake in componentB.bbappend to install my script
> from path meta-layer-B/recipes-X/componentB/files? It is really
> frustrating that variable THISDIR doesn't indicates to path meta-
> layer-B/recipes-X/componentB when I used it in componentB.bbapend.

THISDIR isn't meant to be used from do_install, its something which
works at parsing time using immediate expansion.

You need to reference the file you're using from SRC_URI and use the
functionality in SRC_URI to override files from other layers. It should
copy the right thing to WORKDIR which you can then install in
do_install.

To make it see the files in the extra layer, this is why you see
recipes which do things like:

FILESEXTRAPATHS_prepend := "${THISDIR}/${PN}:"

so your bbappend might have:

FILESEXTRAPATHS_prepend := "${THISDIR}/files:"

for your case above.


Cheers,

Richard