On 23 October 2017 at 10:08, Zoran Stojsavljevic < zoran.stojsavlje...@gmail.com> wrote:
> > Or better yet use > > http://www.yoctoproject.org/docs/2.3.2/mega-manual/mega-ma > nual.html#ref-classes-image-buildinfo > > Since I am also (relatively) new to YOCTO, reading these emails makes me > think about dependencies between YOCTO distros and layers within distros. > > Looking what is written here, I decided to do couple of the tests on my > own to try to understand better how OpenEmbedded (oe-core) base layer and > Poky distro (with two layers on the top of oe-core) are correlated with > each other. As my best understanding, poky master tree should do nothing > more that follow dependencies (with two additional layers) on the > OpenEmbedded master tree. > > OpenEmbedded layer is YOCTO QEMU project on its own. And one can build > well known QEMU targets on single oe-core. > > In order to verify this, i did git clone (at the same time) on two > distros: oe-core master tree, and on poky master tree. > > Now, after building oe-core, I have the following in qemux86-64 target > /etc/build: > > ----------------------- > Build Configuration: | > ----------------------- > DISTRO = nodistro > DISTRO_VERSION = nodistro.0 > ----------------------- > Layer Revisions: | > ----------------------- > > *meta = master:3b413a80578caacd9a7f405f3c51a3921d78a60d* > > At the same time, for poky, I got the following (qemux86-64 target > /etc/build): > > ----------------------- > Build Configuration: | > ----------------------- > DISTRO = poky > DISTRO_VERSION = 2.4 > ----------------------- > Layer Revisions: | > ----------------------- > *meta = rocko:65d23bd7986615fdfb0f1717b615534a2a14ab80 -- > modified* > meta-poky = rocko:65d23bd7986615fdfb0f1717b615534a2a14ab80 -- > modified > meta-yocto-bsp = rocko:65d23bd7986615fdfb0f1717b615534a2a14ab80 -- > modified > _______ > > Now, the question: should meta - rocko and meta - master have (in *BOLD*) > the SAME master HEAD #??? > No, they're different repositories so have different SHAs. However: $ git show 65d23bd7986615fdfb0f1717b615534a2a14ab80 commit 65d23bd7986615fdfb0f1717b615534a2a14ab80 Author: Randy MacLeod <randy.macl...@windriver.com> Date: Mon Oct 16 11:00:44 2017 -0400 README.qemu: qemuppc64 is not supported (From OE-Core rev: 3b413a80578caacd9a7f405f3c51a3921d78a60d) They're the same commit. poky is generated using combo-layer, which effectively cherry-picks commits from the parent repositories (in this case bitbake, oe-core, meta-poky, meta-yocto-bsp). This explains why the SHAs don't match, as the history doesn't match. Ross
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