[yocto] Kernel customized do_fetch issue

[Joel (Xi Zhou) Zhou]

Hi all,

I created a do_fetch() for checkout in-house git repo, which is working fine with OE.
do_fetch() {
    cd ${WORKDIR}
    rm -rf ${PN}-${PV}
    git clone ssh://svcswgit@git-ccxsw.inhouse.com/linux-lsk ${PN}-${PV}
    cd ${PN}-${PV}
    git checkout ${KBRANCH}
}

With Yocto, the do_fetch() does its job, but do_configure create an issue.
do_configure_prepend() {
    cp ${WORKDIR}/${KERNEL_CONFIG_FILE} ${S}/.config
    oe_runmake oldconfig
}
The do_configure error message:
| make: *** No rule to make target `oldconfig'.  Stop.

Basically, the kernel source checkout by do_fetch() is delete/erase while running do_configure().
I suspect some tasks between do_fetch and do_configure are doing some magic work of moving the kernel  source around.
Any suggestion?

Thanks,
Joel
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