On 13-06-12 4:54 PM, Bryan Evenson wrote:
-----Original Message-----
From: Trevor Woerner [mailto:[email protected]]
Sent: Wednesday, June 12, 2013 4:42 PM
To: Bryan Evenson
Cc: Bruce Ashfield; [email protected]
Subject: Re: [yocto] Problems fetching branch for linux-yocto-custom
On Wed, Jun 12, 2013 at 3:37 PM, Bryan Evenson
<[email protected]> wrote:
# Added KBRANCH spec
KBRANCH = "linux-3.9-at91"
# Override SRC_URI in a bbappend file to point at a different
source
#
tree if you do not want to build from Linus' tree.
SRC_URI = "git://github.com/linux4sam/linux-at91.git;branch=linux-
3.9-
at91;tag=dcdf169e24c0cb6d7dc69e0a09d2395934e95075;protocol=git;nochec
ko
ut=1"
# Changed SRC_URI to following
SRC_URI = "git://github.com/linux4sam/linux-
at91.git;branch=${KBRANCH};protocol=git;nocheckout=1"
It looks like all you did was to define the string "linux-3.9-at91" in
its own variable, put that in your SRC_URI string, and remove the
"tag=..." field. Would your original recipe have worked if all you did
was remove the "tag=..." field?
Is KBRANCH being used somewhere else? Doesn't bitbake's "git" fetcher
already have a generic way of specifying a branch? Why would a kernel
recipe need to also define a branch variable? Do non-kernel recipes
also need to define some kind of branch variable too?
From looking through meta/classes/kernel-yocto.bbclass, I see KBRANCH being used a lot
in reference to the specific branch to be checked out. KBRANCH_DEFAULT defines the
default branch (which defaults to "master") so if you don't specify KBRANCH,
then it'll checkout the KBRANCH_DEFAULT branch.
With that said, I'm wondering what would happen if I specified KBRANCH but didn't put the
"branch=${KBRANCH}" in the SRC_URI. Is this branch= variable from the SRC_URI
being used for the kernel?
There are compatibility checks that will pick up branch, and set
KBRANCH on your behalf if you only use branch= in the SRC_URI, but
there are limitations since clobbering a KBRANCH variable isn't
always possible due to when they are expanded (i.e. recipe parse
time).
Cheers,
Bruce
-Bryan
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