[yocto] File in append recipe not installed

[p_j_r_m]

Hello

I'd like to add an append recipe for base-files in order to install a custom fstab.

In my system I already have this base-files recipes:

    layers/openembedded-core-1.4/meta/recipes-core/base-files/base-files_3.0.14.bb
    layers/meta-montavista-1.4/recipes-core/base-files/base-files_3.0.14.bbappend

So I in my layer I have:

layers/meta-mylayer/recipes/base-files
├── base-files_3.0.14.bbappend
└── files
    └── fstab

and I add this base-files_3.0.14.bbappend content:

FILESEXTRAPATHS_prepend := "${THISDIR}/${PN}-${PV}:"

SRC_URI_append = "file://fstab"

do_install_append() {
        echo "======= ${PN}-${PV} INSTALLING fstab ========"
        install -m 644 ${WORKDIR}/fstab ${D}${sysconfdir}
}

but no matter how I put FILESEXTRAPATHS_prepend or how I name my bbappend when I build the recipe with bitbake base-files it never gets called and my fstab file is not installed.
If the original recipe is base-files_3.0.14.bb, why append is base-files_3.0.14.bbappend instead of base-files_3.bbappend only? How should i name and put FILESEXTRAPATHS



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