[yocto] Can not build SDK in rocko 'nothing provides /usr/bin/python...'

[Peter Bergin]

Hi,

I'm working in rocko branch and trying to build a SDK with kernel-devsrc 
on a standard qemux86 machine. During task populate_sdk I get the 
following error:

ERROR: core-image-base-1.0-r0 do_populate_sdk: Could not invoke dnf. Command '/work/yocto/rocko/qemux86/tmp/work/qemux86-poky-linux/core-image-base/1.0-r0/recipe-sysroot-native/usr/bin/dnf -y -c /work/yocto/rocko/qemux86/tmp/work/qemux86-poky-linux/core-image-base/1.0-r0/sdk/image/opt/poky/2.4.3/sysroots/i586-poky-linux/etc/dnf/dnf.conf --setopt=reposdir=/work/yocto/rocko/qemux86/tmp/work/qemux86-poky-linux/core-image-base/1.0-r0/sdk/image/opt/poky/2.4.3/sysroots/i586-poky-linux/etc/yum.repos.d --repofrompath=oe-repo,/work/yocto/rocko/qemux86/tmp/work/qemux86-poky-linux/core-image-base/1.0-r0/oe-sdk-repo --installroot=/work/yocto/rocko/qemux86/tmp/work/qemux86-poky-linux/core-image-base/1.0-r0/sdk/image/opt/poky/2.4.3/sysroots/i586-poky-linux --setopt=logdir=/work/yocto/rocko/qemux86/tmp/work/qemux86-poky-linux/core-image-base/1.0-r0/temp --nogpgcheck install packagegroup-core-standalone-sdk-target run-postinsts psplash packagegroup-base-extended packagegroup-core-boot linux-libc-headers-dev kernel-devsrc' returned 1:
Added oe-repo repo from /work/yocto/rocko/qemux86/tmp/work/qemux86-poky-linux/core-image-base/1.0-r0/oe-sdk-repo
Last metadata expiration check: 0:00:00 ago on Fri 02 Nov 2018 07:14:37 AM UTC.
Error:
  Problem: conflicting requests
   - nothing provides /usr/bin/python needed by kernel-devsrc-1.0-r0.qemux86

ERROR: core-image-base-1.0-r0 do_populate_sdk: Function failed: do_populate_sdk
ERROR: Logfile of failure stored in: /work/yocto/rocko/qemux86/tmp/work/qemux86-poky-linux/core-image-base/1.0-r0/temp/log.do_populate_sdk.25760
ERROR: Task (/work/yocto/rocko/layers/poky/meta/recipes-core/images/core-image-base.bb:do_populate_sdk) failed with exit code '1'

Any ideas about what the problem is and how to fix?

My addition to standard Yocto configuration is:

TOOLCHAIN_TARGET_TASK_append = " \
     kernel-devsrc \
     linux-libc-headers-dev \
"

I first build image with 'bitbake core-image-base' then I got the error 
when building SDK with 'bitbake core-image-base -c populate_sdk'


Thanks,
/Peter
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