[yocto] Read-only filesystems: Move directory to RW directory and symlink back

[Lukasz Zemla]

On Tuesday, March 26, 2019 9:54 PM, Timothy Froehlich wrote:
> Is there a recommended way of doing this? Right now I have a ROOTFS_POSTPROCESS_CMD 
> that moves the directories and symlinks them back, but I'm not sure if I'm doing it exactly right or if there's something built-in.

> The function just does a bunch of this:
>    install -d ${D}/${persist_dir}

>    mv ${D}/${ORIG} ${D}/${persist_dir}/${LINKNAME}
>    ln -sr ${D}/${persist_dir}/${LINKNAME} ${D}/${ORIG}

I am also working on read-only rootfs now. Unfortunately it looks like that Yocto does not provide ready solution for symlinking. I use similar approach to yours.
If you accept bind mounts or overlayfs, you may have a look at meta/recipes-core/volatile-binds/volatile-binds.bb

Best regards,
Lukasz Zemla

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