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lib/deploy: Add support for overlay initrds #2155

Merged
merged 3 commits into from
Oct 2, 2020
Merged

lib/deploy: Add support for overlay initrds #2155

merged 3 commits into from
Oct 2, 2020

Commits on Sep 30, 2020

  1. lib/bootconfig: Add support for multiple initrd keys 

    Prep for actually teaching the rest of the codebase about this.

We keep the primary initrd in the `options` hash table for backwards
compatibility.
    @jlebon
    jlebon committed Sep 30, 2020
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  2. lib/deploy: Add deploy/stage APIs with options 

    And make the `override_kernel_argv` one of those options. This is mostly
a mechanical move here, no functional change otherwise.

Prep for adding a new option.
    @jlebon
    jlebon committed Sep 30, 2020
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  3. lib/deploy: Add support for overlay initrds 

    In FCOS and RHCOS, the need to configure software in the initramfs has
come up multiple times. Sometimes, using kernel arguments suffices.
Other times, it really must be a configuration file. Rebuilding the
initramfs on the client-side however is a costly operation. Not only
does it add complexity to the update workflow, it also erodes a lot of
the value obtained from using the baked "blessed" initramfs from the
tree itself.

One elegant way to address this is to allow specifying multiple
initramfses. This is supported by most bootloaders (notably GRUB) and
results in each initrd being overlayed on top of each other.

This patch allows libostree clients to leverage this so that they can
avoid regenerating the initramfs entirely. libostree itself is agnostic
as to what kind and how much data overlay initrds contain. It's up to
the clients to enforce such boundaries.

To implement this, we add a new ostree_sysroot_stage_overlay_initrd
which takes a file descriptor and returns a checksum. Then users can
pass these checksums when calling the deploy APIs via the new array
option `overlay_initrds`. We copy these files into `/boot` and add them
to the BLS as another `initrd` entry.
    @jlebon
    jlebon committed Sep 30, 2020
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