[OE-core] slightly confused about .bbappend file and FILESPATH

Martin Jansa martin.jansa at gmail.com
Wed Dec 12 04:57:36 UTC 2012 

On Tue, Dec 11, 2012 at 02:39:16PM -0500, Robert P. J. Day wrote:
> On Tue, 11 Dec 2012, Martin Jansa wrote:
> 
> > On Thu, Dec 06, 2012 at 01:19:57PM -0500, Robert P. J. Day wrote:
> > > On Thu, 6 Dec 2012, Mark Hatle wrote:
> > >
> > > > On 12/6/12 12:03 PM, Robert P. J. Day wrote:
> > > > >
> > > > >    currently writing a tutorial page on how .bbappend files and
> > > > > FILESPATH work, and i wanted to use a live example, but now i'm
> > > > > confused.
> > > >
> > > > The way it works is the same way as PATH in the shell.  It's just a set of
> > > > search paths.
> > > >
> > > > >    using meta-ti layer, i chose to build core-image-minimal for a
> > > > > beagleboard, for which the meta-ti layer has the following under
> > > > > recipes-core/netbase/ that i want to use as an example:
> > > > >
> > > > > $ find
> > > > > .
> > > > > ./netbase_5.0.bbappend
> > > > > ./netbase-5.0
> > > > > ./netbase-5.0/beagleboard
> > > > > ./netbase-5.0/beagleboard/interfaces
> > > > > $
> > > > >
> > > > > where the .bbappend file contains only:
> > > > >
> > > > > THISDIR := "${@os.path.dirname(bb.data.getVar('FILE', d, True))}"
> > > >
> > > > I believe this is the default value of 'THISDIR' already, so there is no
> > > > reason to specify it in the .bbappend itself.
> > > >
> > > > > FILESPATH =. "${@base_set_filespath(["${THISDIR}/${PN}"], d)}:"
> > > >
> > > > In this example, it's incorrect.  As you have a directory named
> > > > "netbase-5.0", so your FILESPATH should be: ${THISDIR}/${PN}-${PV}
> > >
> > >   ok, so that's just a bug in the setting of FILESPATH in that one
> > > example?  whew.  i was seriously wondering how badly i misunderstood
> > > how this feature worked.
> > >
> > >   as soon as my beagle core-image-minimal finishes building, i should
> > > be able to trivially check that the interfaces file used to populate
> > > the rootfs image is the one from oe-core and not the one that should
> > > have come from meta-ti.
> >
> > See FILESEXTRAPATHS in other bbappends and
> >
> > meta/classes/base.bbclass:FILESPATH = "${@base_set_filespath(["${FILE_DIRNAME}/${BP}","${FILE_DIRNAME}/${BPN}", "${FILE_DIRNAME}/files"], d)}"
> >
> > + definition of fce base_set_filespath:
> > meta/classes/utils.bbclass:def base_set_filespath(path, d):
> 
>   i'm still not sure what your point is here.  

That all you need is 1 line:
FILESEXTRAPATHS_prepend := "${THISDIR}/${BP}:"

> to be perfectly clear,
> if i'm pulling in the meta-ti layer and building a core-image-minimal
> for a beagleboard, it appears that the overriding network interfaces
> file from the meta-ti layer does *not* override the one from oe-core
> since this is the full value of FILESPATH being used:
> 
> # FILESPATH="${@base_set_filespath(["${THISDIR}/${PN}"], d)}
> ${@base_set_filespath(["${FILE_DIRNAME}/${BP}", "${FILE_DIRNAME}/${BPN}", "${FILE_DIRNAME}/files"], d)}"
> FILESPATH="/home/rpjday/OE/dist/layers/meta-ti/recipes-core/netbase/netbase/linux-gnueabi
> /home/rpjday/OE/dist/layers/meta-ti/recipes-core/netbase/netbase/arm
> /home/rpjday/OE/dist/layers/meta-ti/recipes-core/netbase/netbase/build-linux
> /home/rpjday/OE/dist/layers/meta-ti/recipes-core/netbase/netbase/pn-netbase
> /home/rpjday/OE/dist/layers/meta-ti/recipes-core/netbase/netbase/dm814x-evm
> /home/rpjday/OE/dist/layers/meta-ti/recipes-core/netbase/netbase/ti814x
> /home/rpjday/OE/dist/layers/meta-ti/recipes-core/netbase/netbase/armv7a
> /home/rpjday/OE/dist/layers/meta-ti/recipes-core/netbase/netbase/
> /home/rpjday/OE/dist/layers/meta-ti/recipes-core/netbase/netbase/class-target
> /home/rpjday/OE/dist/layers/meta-ti/recipes-core/netbase/netbase/forcevariable
> /home/rpjday/OE/dist/layers/meta-ti/recipes-core/netbase/netbase/libc-glibc
> /home/rpjday/OE/dist/layers/meta-ti/recipes-core/netbase/netbase/
> /home/rpjday/OE/dist/layers/oe-core/meta/recipes-core/netbase/netbase-5.0/linux-gnueabi
> /home/rpjday/OE/dist/layers/oe-core/meta/recipes-core/netbase/netbase-5.0/arm
> /home/rpjday/OE/dist/layers/oe-core/meta/recipes-core/netbase/netbase-5.0/build-linux
> /home/rpjday/OE/dist/layers/oe-core/meta/recipes-core/netbase/netbase-5.0/pn-netbase
> /home/rpjday/OE/dist/layers/oe-core/meta/recipes-core/netbase/netbase-5.0/dm814x-evm
> /home/rpjday/OE/dist/layers/oe-core/meta/recipes-core/netbase/netbase-5.0/ti814x
> /home/rpjday/OE/dist/layers/oe-core/meta/recipes-core/netbase/netbase-5.0/armv7a
> /home/rpjday/OE/dist/layers/oe-core/meta/recipes-core/netbase/netbase-5.0/
> /home/rpjday/OE/dist/layers/oe-core/meta/recipes-core/netbase/netbase-5.0/class-target
> /home/rpjday/OE/dist/layers/oe-core/meta/recipes-core/netbase/netbase-5.0/forcevariable
> /home/rpjday/OE/dist/layers/oe-core/meta/recipes-core/netbase/netbase-5.0/libc-glibc
> /home/rpjday/OE/dist/layers/oe-core/meta/recipes-core/netbase/netbase-5.0/
> /home/rpjday/OE/dist/layers/oe-core/meta/recipes-core/netbase/netbase/linux-gnueabi
> /home/rpjday/OE/dist/layers/oe-core/meta/recipes-core/netbase/netbase/arm
> /home/rpjday/OE/dist/layers/oe-core/meta/recipes-core/netbase/netbase/build-linux
> /home/rpjday/OE/dist/layers/oe-core/meta/recipes-core/netbase/netbase/pn-netbase
> /home/rpjday/OE/dist/layers/oe-core/meta/recipes-core/netbase/netbase/dm814x-evm
> /home/rpjday/OE/dist/layers/oe-core/meta/recipes-core/netbase/netbase/ti814x
> /home/rpjday/OE/dist/layers/oe-core/meta/recipes-core/netbase/netbase/armv7a
> /home/rpjday/OE/dist/layers/oe-core/meta/recipes-core/netbase/netbase/
> /home/rpjday/OE/dist/layers/oe-core/meta/recipes-core/netbase/netbase/class-target
> /home/rpjday/OE/dist/layers/oe-core/meta/recipes-core/netbase/netbase/forcevariable
> /home/rpjday/OE/dist/layers/oe-core/meta/recipes-core/netbase/netbase/libc-glibc
> /home/rpjday/OE/dist/layers/oe-core/meta/recipes-core/netbase/netbase/
> /home/rpjday/OE/dist/layers/oe-core/meta/recipes-core/netbase/files/linux-gnueabi
> /home/rpjday/OE/dist/layers/oe-core/meta/recipes-core/netbase/files/arm
> /home/rpjday/OE/dist/layers/oe-core/meta/recipes-core/netbase/files/build-linux
> /home/rpjday/OE/dist/layers/oe-core/meta/recipes-core/netbase/files/pn-netbase
> /home/rpjday/OE/dist/layers/oe-core/meta/recipes-core/netbase/files/dm814x-evm
> /home/rpjday/OE/dist/layers/oe-core/meta/recipes-core/netbase/files/ti814x
> /home/rpjday/OE/dist/layers/oe-core/meta/recipes-core/netbase/files/armv7a
> /home/rpjday/OE/dist/layers/oe-core/meta/recipes-core/netbase/files/
> /home/rpjday/OE/dist/layers/oe-core/meta/recipes-core/netbase/files/class-target
> /home/rpjday/OE/dist/layers/oe-core/meta/recipes-core/netbase/files/forcevariable
> /home/rpjday/OE/dist/layers/oe-core/meta/recipes-core/netbase/files/libc-glibc
> /home/rpjday/OE/dist/layers/oe-core/meta/recipes-core/netbase/files/"
> 
>   note that the directories from the meta-ti layer don't include the
> (correct) value of netbase/netbase-5.0, since (as i understand it) the
> line in base.bbclass you refer to:
> 
> FILESPATH = "${@base_set_filespath(["${FILE_DIRNAME}/${BP}",  \
>   "${FILE_DIRNAME}/${BPN}", "${FILE_DIRNAME}/files"], d)}"
> 
> only causes the expansion into the common variants of the directory
> name for the oe-core layer (as you can see above).  so under oe-core,
> you'll get the automatic directory name variants netbase, netbase-5.0
> and files (exactly what you see above).
> 
>   but under the meta-ti layer for netbase, you *don't* get that since
> here's the netbase_5.0.bbappend file:
> 
>   THISDIR := "${@os.path.dirname(bb.data.getVar('FILE', d, True))}"
>   FILESPATH =. "${@base_set_filespath(["${THISDIR}/${PN}"], d)}:"
> 
> which (unless i'm cripplingly mistaken) will prepend the set of
> directories *only* under precisely that name "${THISDIR}/${PN}", which
> is exactly netbase/netbase, which is wrong.
> 
>   am i completely misunderstanding what's happening here?  as i see
> it, the trivial fix is to simply tweak the .bbappend file to read:
> 
> FILESPATH =. "${@base_set_filespath(["${THISDIR}/${PN}-${PV}}"], d)}:"
> 
> i already submitted a patch for that to the meta-ti list, i just want
> to confirm that the above really is a bug in the netbase .bbappend
> file in that it won't pick up the overriding interfaces file.
> 
> rday
> 
> -- 
> 
> ========================================================================
> Robert P. J. Day                                 Ottawa, Ontario, CANADA
>                         http://crashcourse.ca
> 
> Twitter:                                       http://twitter.com/rpjday
> LinkedIn:                               http://ca.linkedin.com/in/rpjday
> ========================================================================
> 

-- 
Martin 'JaMa' Jansa     jabber: Martin.Jansa at gmail.com
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