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feat(tvix/boot): boot nixos VM

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This makes use of the vmCmdline and assertVMOutput to boot a NixOS VM
off of `tvix-store virtiofs` have it write a message on successful
bootup, then have it shut down again.

We check we see the message in the output.

Seeding the store with the closure it's what's currently taking most
of the time (as it's all linear still), so log a message before booting
the VM.

Change-Id: I6887d935f589eb0ad6507033c01337e1ec500a0b
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11191
Autosubmit: flokli <flokli@flokli.de>
Reviewed-by: raitobezarius <tvl@lahfa.xyz>
Tested-by: BuildkiteCI
This commit is contained in:
Florian Klink 2024-03-18 12:09:49 +02:00 committed by flokli
parent 538d5fc8ee
commit cf47294b9e
1 changed files with 34 additions and 0 deletions
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34
tvix/boot/tests/default.nix
View file

@ -70,12 +70,38 @@ let
tvix-store --otlp=false copy
'' + ''
# Invoke a VM using tvix as the backing store, ensure the outpath appears in its listing.
echo "Starting VM…"
CH_CMDLINE="${vmCmdline}" run-tvix-vm 2>&1 | tee output.txt
grep "${assertVMOutput}" output.txt
'';
requiredSystemFeatures = [ "kvm" ];
};
systemFor = sys: (depot.ops.nixos.nixosFor sys).system;
testSystem = systemFor ({ modulesPath, pkgs, ... }: {
# Set some options necessary to evaluate.
boot.loader.systemd-boot.enable = true;
# TODO: figure out how to disable this without causing eval to fail
fileSystems."/" = {
device = "/dev/root";
fsType = "tmpfs";
};
services.getty.helpLine = "Onwards and upwards.";
systemd.services.do-shutdown = {
after = [ "getty.target" ];
description = "Shut down again";
wantedBy = [ "multi-user.target" ];
serviceConfig.Type = "oneshot";
script = "/run/current-system/sw/bin/systemctl poweroff --when=+10s";
};
# Don't warn about stateVersion.
system.stateVersion = "24.05";
});
in
depot.nix.readTree.drvTargets
{
@ -101,4 +127,12 @@ depot.nix.readTree.drvTargets
path = depot.tvix.store;
isClosure = true;
});
closure-nixos = (mkBootTest {
blobServiceAddr = "objectstore+file://$PWD/blobs";
path = testSystem;
isClosure = true;
vmCmdline = "init=${testSystem}/init panic=-1"; # reboot immediately on panic
assertVMOutput = "Onwards and upwards.";
});
}