[yocto] Post-installation and read-only-image

[Neuer User]

Hello

I build a read-only-image and need to exchange a few configuration files
before the final image is build. Unfortunately, I ran into this error:

ERROR: The following packages could not be configuredoffline and rootfs
is read-only: xxx

My recipe looks basically as follows:

...
do_install() {
    install -d ${D}${sbindir}
    install -m 0700 ${S}/sbin/* ${D}${sbindir}

    install -d ${D}${bindir}
...
}

# Overwrite some configuration data with specific files
pkg_postinst_${PN} () {
    install -m 0600 ${S}/ssh/* ${D}/etc/ssh/
    install -m 0755 ${S}/etc/rc.local ${D}/etc/
    install -m 0644 ${S}/etc/asound.conf ${D}/etc/
    install -m 0400 ${S}/etc/shadow ${D}/etc/
    install -m 0440 ${S}/etc/sudoers ${D}/etc/
    install -m 0644 ${S}/etc/default-ntpdate ${D}/etc/default/ntpdate
}

FILES_${PN} += "/*"


Anybody knows, what is wrong that the image cannot be configured offline?

Thanks

Michael