[yocto] Deleting layers in Hob

[Lu, Lianhao]

> -----Original Message-----
> From: yocto-bounces at yoctoproject.org [mailto:yocto-bounces at yoctoproject.org] On Behalf Of Xu, Dongxiao
> Sent: Tuesday, March 27, 2012 2:49 PM
> To: yocto
> Subject: [yocto] Deleting layers in Hob
> 
> When using Hob in Yocto Project, I found a issue when deleting layers. I
> think I ever raised this problem before.
> 
> Let me briefly introduce how layer removal works in Hob. When user
> changes a layer, it will following the below steps
> 1) init the cooker.
> 2) set new layers to cooker.
> 3) parse configuration files.
> 4) get available machines, distros, SDKs, etc.
> 
> As we know, if we source oe-init-build-env in Yocto project environment,
> we will have DISTRO="poky" set in local.conf by default, where the
> "poky" DISTRO comes from the meta-yocto layer. If user deletes
> meta-yocto in Hob, and then error will happen when bitbake parsing the
> local.conf, since it could not find where the "poky" DISTRO is defined.
> 
> Even if we are able to successfully removed the meta-yocto layer by
> removing the DISTRO definition in local.conf, system will report another
> issue that:
> 
> Your configuration is using stamp files including the sstate hash but
> your build directory was built with stamp files that do not include
> this.
> To continue, either rebuild or switch back to the OEBasic signature
> handler with BB_SIGNATURE_HANDLER = 'OEBasic'.
> 
> This is because BB_SIGNATURE_HANDLER = "OEBasic" is also defined in
> meta-yocto layer (poky.conf).

Meta-yocto is using OEBasicHash as default signature handler(ABI_VERSION=8, see ${TMPDIR}/abi_version), while oe-core is still using the OEBasic(ABI_VERSION=7). This means the oe-core can not reuse the stamp files generated by meta-yocto. 

> 
> So it seems that in certain environment (e.x, Yocto Project), certain
> layer (e.x, meta-yocto) should not be removed?
> 
> Or any idea on how to solve this problem?
> 
> Thanks,
> Dongxiao
> 
> 
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