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nixos/test-driver: move sshBackdoor cfg from test-instrumentation to driver

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That way, we don't need to duplicate the sshBackdoor options on NixOS-level.

Suggested-by: Jacek Galowicz <jacek@galowicz.de>
This commit is contained in:
Maximilian Bosch 2025-05-10 10:38:38 +02:00
parent 12c544e008
commit b8b86834b7
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2 changed files with 26 additions and 45 deletions
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32
nixos/lib/testing/nodes.nix
View file

@ -88,7 +88,7 @@ in
default = 2;
type = types.ints.between 2 4294967296;
description = ''
This field is only relevant when multiple users run the (interactive)
This field is only relevant when multiple users run the (interactive)
driver outside the sandbox and with the SSH backdoor activated.
The typical symptom for this being a problem are error messages like this:
`vhost-vsock: unable to set guest cid: Address already in use`
@ -206,11 +206,31 @@ in
nixpkgs.pkgs = config.node.pkgs;
imports = [ ../../modules/misc/nixpkgs/read-only.nix ];
})
(mkIf config.sshBackdoor.enable {
testing.sshBackdoor = {
inherit (config.sshBackdoor) enable vsockOffset;
};
})
(mkIf config.sshBackdoor.enable (
let
inherit (config.sshBackdoor) vsockOffset;
in
{ config, ... }:
{
services.openssh = {
enable = true;
settings = {
PermitRootLogin = "yes";
PermitEmptyPasswords = "yes";
};
};
security.pam.services.sshd = {
allowNullPassword = true;
};
virtualisation.qemu.options = [
"-device vhost-vsock-pci,guest-cid=${
toString (config.virtualisation.test.nodeNumber + vsockOffset)
}"
];
}
))
];
};

39
nixos/modules/testing/test-instrumentation.nix
View file

@ -86,27 +86,6 @@ in
enables commands to be sent to test and debug stage 1. Use
machine.switch_root() to leave stage 1 and proceed to stage 2
'';
sshBackdoor = {
enable = mkEnableOption "vsock-based ssh backdoor for the VM";
vsockOffset = mkOption {
default = 2;
type = types.ints.between 2 4294967296;
description = ''
This field is only relevant when multiple users run the (interactive)
driver outside the sandbox and with the SSH backdoor activated.
The typical symptom for this being a problem are error messages like this:
`vhost-vsock: unable to set guest cid: Address already in use`
This option allows to assign an offset to each vsock number to
resolve this.
This is a 32bit number. The lowest possible vsock number is `3`
(i.e. with the lowest node number being `1`, this is 2+1).
'';
};
};
};
config = {
@ -120,18 +99,6 @@ in
}
];
services.openssh = mkIf config.testing.sshBackdoor.enable {
enable = true;
settings = {
PermitRootLogin = "yes";
PermitEmptyPasswords = "yes";
};
};
security.pam.services.sshd = mkIf config.testing.sshBackdoor.enable {
allowNullPassword = true;
};
systemd.services.backdoor = lib.mkMerge [
backdoorService
{
@ -207,12 +174,6 @@ in
# we avoid defining attributes if not possible.
# TODO: refactor such that test-instrumentation can import qemu-vm
package = lib.mkDefault pkgs.qemu_test;
options = mkIf config.testing.sshBackdoor.enable [
"-device vhost-vsock-pci,guest-cid=${
toString (config.virtualisation.test.nodeNumber + config.testing.sshBackdoor.vsockOffset)
}"
];
};
};