kergoth/meta-ro-rootfs

Various bits to improve read-only-rootfs handling

read-only-rootfs support enhancements Yocto layer

This layer holds fixes for read-only-rootfs support that were needed by Mentor Graphics Corporation. Currently, it contains a recipe which implements the equivalent of the current sysvinit read-only-rootfs hook for systemd, to be installed into read-only-rootfs images, a bbappend to fix lighttpd so it doesn't try to write to /www, and a couple other misc changes. It also holds remnants from an initial move toward consolidating the systemd tmpfiles.d and sysvinit volatiles mechanisms.

Note that our ro-binds recipe installs configuration which mount-binds uses to set up the writable paths. To add a new path to be made writable, either a file or a directory, create a new file in /etc/binds.d/ with lines like this: /var/volatile/lib /var/lib.

This layer depends on:

URI: git://git.openembedded.org/openembedded-core Branch: master

Contributing

URL: https://github.com/MentorEmbedded/meta-ro-rootfs

To contribute to this layer, please fork and submit pull requests to the above repository with github, or open issues for any bugs you find, or feature requests you have.

Usage

1. Add this layer to BBLAYERS in bblayers.conf
2. Enable read-only-rootfs for your images, by adding this to local.conf: EXTRA_IMAGE_FEATURES += "read-only-rootfs"
3. Set up the mount-binds recipe to be included in the image for read-only-rootfs images (this is a temporary mechanism, intended to be replaced either with changes to image.bbclass, or aligning more closely with what sysvinit is doing): IMAGE_INSTALL_append = " ${@'ro-binds' if 'read-only-rootfs' in IMAGE_FEATURES.split() and 'systemd'