Re: [PATCH 4/7] Adjust partition layout to support updates

[Alyssa Ross <hi@alyssa.is>]

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Demi Marie Obenour <demiobenour@gmail.com> writes:

> systemd-sysupdate has strict requirements on the partition layout:
>
> - The label of the active partition must match the template in the
>   .transfer file.  For instance, the root filesystem of Spectrum OS
>   0.0.0 will be in a partition with label Spectrum_OS_0.0.0.
> - The label of the inactive partition must either be that of the old
>   version of the OS or "_empty".  The former indicates an incomplete
>   update.
> - The partition type UUID must conform to the Discoverable Partition
>   Specification.
>
> After installing an image to a partition, systemd-sysupdate updates the
> label of the partition to match the image's version.  However, it does
> not update the partition UUID.  Therefore, use the partition label, not
> the partition UUID, to find the root filesystem and its verity metadata.
>
> systemd-sysupdate will fail if the OS image does not fit in the
> partitions that the installer created.  Therefor, make the partitions
> very large so that there is plenty of room for the OS to grow.  This
> requires rewriting the code that calculates the partition sizes.
>
> Since the partition label includes the OS version, add an OS version
> number.  Use 0.0.0 to indicate that Spectrum OS is still in very early
> development and should not be used.
>
> Signed-off-by: Demi Marie Obenour <demiobenour@gmail.com>
> ---
>  host/initramfs/Makefile        | 17 +++++-----
>  host/initramfs/default.nix     |  2 ++
>  host/initramfs/etc/init        | 17 +++-------
>  host/initramfs/etc/probe       | 20 ++++++++----
>  host/initramfs/shell.nix       |  1 +
>  host/rootfs/Makefile           | 23 ++++++++------
>  host/rootfs/default.nix        |  3 ++
>  host/rootfs/shell.nix          |  1 +
>  img/app/Makefile               |  2 +-
>  img/app/default.nix            |  5 +--
>  lib/kcmdline-utils.mk          | 10 +++---
>  lib/version.nix                | 15 +++++++++
>  release/checks/no-roothash.nix |  2 +-
>  release/live/Makefile          | 15 ++++-----
>  release/live/default.nix       | 11 +++++--
>  release/live/shell.nix         |  4 ++-
>  scripts/format-uuid.awk        | 35 ++++++++++++++++++++
>  scripts/format-uuid.sh         |  1 +
>  scripts/make-gpt.bash          | 72 ++++++++++++++++++++++++++++++++++++++++++
>  scripts/make-gpt.sh            | 67 ++-------------------------------------
>  scripts/make-live-image.sh     | 41 ++++++++++++++++++++++++
>  scripts/sfdisk-field.awk       |  3 +-
>  version                        |  1 +
>  version.license                |  2 ++
>  vm/sys/net/Makefile            |  2 +-
>  vm/sys/net/default.nix         |  5 +--
>  26 files changed, 252 insertions(+), 125 deletions(-)

I expect this will change once we figure out what to do about the
installer / combined image, so I'm leaving it for now.

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