Allow the user to disable overriding the fileSystems option with
virtualisation.fileSystems by setting
`virtualisation.fileSystems = lib.mkForce { };`.
With this change you can use the qemu-vm module to boot from an external
image that was not produced by the qemu-vm module itself. The user can
now re-use the modularly set fileSystems option instead of having to
reproduce it in virtualisation.fileSystems.
A couple notes:
---------------
Adding invalid `console=` parameters is not an issue. Any invalid
console is unused. The kernel will use the "rightmost" (last) valid
`console=` parameter as the default output. Thus the SBBR-mandated AMA0
on A1, and ttyS0 on x86_64 as documented by Oracle.
`nvme_core.shutdown_timeout=10` was added as it was written this way in
the A1 images. Unclear whether `nvme.shutdown_timeout=10` is wrong. At
worst this is a no-op.
This commit makes the OpenSSH option `PermitRootLogin` available to be
configured by other NixOS modules when using the Google Cloud Engine
(GCE) NixOS image builder. Other options like `PasswordAuthentication`
were already configurable, so I think it makes sense to make `PermitRootLogin`
configurable as well is order to disable it completely, for example.
NOTES:
@jakeschurch did not realize that is was already updated on master, but not
backported to 23.05 channel
Signed-off-by: Jake Schurch <jakeschurch@gmail.com>
This change removes the bespoke logic around identifying block devices.
Instead of trying to find the right device by iterating over
`qemu.drives` and guessing the right partition number (e.g.
/dev/vda{1,2}), devices are now identified by persistent names provided
by udev in /dev/disk/by-*.
Before this change, the root device was formatted on demand in the
initrd. However, this makes it impossible to use filesystem identifiers
to identify devices. Now, the formatting step is performed before the VM
is started. Because some tests, however, rely on this behaviour, a
utility function to replace this behaviour in added in
/nixos/tests/common/auto-format-root-device.nix.
Devices that contain neither a partition table nor a filesystem are
identified by their hardware serial number which is injecetd via QEMU
(and is thus persistent and predictable). PCI paths are not a reliably
way to identify devices because their availability and numbering depends
on the QEMU machine type.
This change makes the module more robust against changes in QEMU and the
kernel (non-persistent device naming) and by decoupling abstractions
(i.e. rootDevice, bootPartition, and bootLoaderDevice) enables further
improvement down the line.
As with many things, we have scenarios where we don't want to boot on a
disk / bootloader and also we don't want to boot directly.
Sometimes, we want to boot through an OptionROM of our NIC, e.g. netboot
scenarios or let the firmware decide something, e.g. UEFI PXE (or even
UEFI OptionROM!).
This is composed of:
- `directBoot.enable`: whether to direct boot or not
- `directBoot.initrd`: enable overriding the
`config.system.build.initialRamdisk` defaults, useful for
netbootRamdisk for example.
This makes it possible.
