[yocto] PHP recipe do_install() function

[Matt Schuckmann]

I I'm trying to understand this snippet from the php recipe
do_install_append_class-target() {
    install -d ${D}/${sysconfdir}/
    if [ -d ${D}/${STAGING_DIR_NATIVE}/${sysconfdir} ];then
         mv ${D}/${STAGING_DIR_NATIVE}/${sysconfdir}/* ${D}/${sysconfdir}/
    fi
    rm -rf ${D}/${TMPDIR}
    rm -rf ${D}/.registry
    rm -rf ${D}/.channels
    rm -rf ${D}/.[a-z]*
    rm -rf ${D}/var
    rm -f  ${D}/${sysconfdir}/php-fpm.conf.default
    sed -i 's:${STAGING_DIR_NATIVE}::g' ${D}/${sysconfdir}/pear.conf
    install -m 0644 ${WORKDIR}/php-fpm.conf ${D}/${sysconfdir}/php-fpm.conf
    install -d ${D}/${sysconfdir}/apache2/conf.d
    install -m 0644 ${WORKDIR}/php-fpm-apache.conf ${D}/${sysconfdir}/apache2/conf.d/php-fpm.conf
    install -d ${D}${sysconfdir}/init.d
    sed -i 's:=/usr/sbin:=${sbindir}:g' ${B}/sapi/fpm/init.d.php-fpm
    sed -i 's:=/etc:=${sysconfdir}:g' ${B}/sapi/fpm/init.d.php-fpm
    sed -i 's:=/var:=${localstatedir}:g' ${B}/sapi/fpm/init.d.php-fpm
    install -m 0755 ${B}/sapi/fpm/init.d.php-fpm ${D}${sysconfdir}/init.d/php-fpm
    TMP=`dirname ${D}/${TMPDIR}`
    while test ${TMP} != ${D}; do
        rmdir ${TMP}
        TMP=`dirname ${TMP}`;
    done
}

I've written a bbappend for php that removes some of the options that I don't need and I'm having a problem with the "rmdir ${TMP}" line failing saying that the file or directory doesn't exist. Reading this function in its entirety ${TMP} shouldn't exist and this recipe shouldn't ever work because ${D}/${TMPDIR} has already been forcefully and recursively removed up at the top of the function. 

Am I missing something here? 

Thanks, 
Matt S.