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Add concept of state overlays #3120

Merged
merged 2 commits into from
Jan 11, 2024
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Commits on Jan 10, 2024

  1. Add concept of state overlays

    In the OSTree model, executables go in `/usr`, state in `/var` and
    configuration in `/etc`. Software that lives in `/opt` however messes
    this up because it often mixes code *and* state, making it harder to
    manage.
    
    More generally, it's sometimes useful to have the OSTree commit contain
    code under a certain path, but still allow that path to be writable by
    software and the sysadmin at runtime (`/usr/local` is another instance).
    
    Add the concept of state overlays. A state overlay is an overlayfs
    mount whose upper directory, which contains unmanaged state, is carried
    forward on top of a lower directory, containing OSTree-managed files.
    
    In the example of `/usr/local`, OSTree commits can ship content there,
    all while allowing users to e.g. add scripts in `/usr/local/bin` when
    booted into that commit.
    
    Some reconciliation logic is executed whenever the base is updated so
    that newer files in the base are never shadowed by a copied up version
    in the upper directory. This matches RPM semantics when upgrading
    packages whose files may have been modified.
    
    For ease of integration, this is exposed as a systemd template unit which
    any downstream distro/user can enable. The instance name is the mountpath
    in escaped systemd path notation (e.g.
    `[email protected]`).
    
    See discussions in ostreedev#3113 for
    more details.
    jlebon committed Jan 10, 2024
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  2. build(deps): bump libglnx from aff1eea to b415d046

    Bumps libglnx from `aff1eea` to `b415d046`.
    
    For https://gitlab.gnome.org/GNOME/libglnx/-/merge_requests/52.
    
    Update submodule: libglnx
    jlebon committed Jan 10, 2024
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