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nixos/tests/incus: test config creation and switch-to-configuration

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Add subtests to verify the activation script replacements:
- config create service creates /etc/nixos/configuration.nix on first boot
- service does not overwrite existing configuration (ConditionPathExists)
- switch-to-configuration switch calls installBootLoader, creating /sbin/init
  (container-only, since VMs use a real bootloader)
This commit is contained in:
r-vdp
2026-03-18 18:37:06 +01:00
parent 0f363a1cb4
commit 61425f107b
1 changed files with 25 additions and 0 deletions
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nixos/tests/incus/incus-tests-module.nix
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@@ -156,6 +156,16 @@ in
server.succeed(f"incus exec {instance_name} -- test -e /dev/tpm0")
server.succeed(f"incus exec {instance_name} -- test -e /dev/tpmrm0")
with subtest("[${image_id}] default configuration.nix is created on first boot"):
server.succeed(f"incus exec {instance_name} -- test -f /etc/nixos/configuration.nix")
with subtest("[${image_id}] configuration.nix create service does not overwrite existing config"):
server.succeed(f"incus exec {instance_name} -- systemctl restart incus-create-nixos-config.service")
status = server.succeed(
f"incus exec {instance_name} -- systemctl show -p ActiveState incus-create-nixos-config.service"
).strip()
assert "inactive" in status, f"Expected inactive (ConditionPathExists should prevent start), got {status}"
''
#
# container specific
@@ -164,6 +174,21 @@ in
lib.optionalString (config.type == "container")
# python
''
with subtest("[${image_id}] switch-to-configuration updates /sbin/init via installBootLoader"):
# Remove /sbin/init so we can verify installBootLoader recreates it
server.succeed(f"incus exec {instance_name} -- rm -f /sbin/init")
server.fail(f"incus exec {instance_name} -- test -e /sbin/init")
server.succeed(
f"incus exec {instance_name} -- /run/current-system/bin/switch-to-configuration switch"
)
# Verify installBootLoader recreated /sbin/init pointing to the system's init
server.succeed(f"incus exec {instance_name} -- test -x /sbin/init")
target = server.succeed(f"incus exec {instance_name} -- readlink -f /sbin/init").strip()
current = server.succeed(f"incus exec {instance_name} -- readlink -f /run/current-system/init").strip()
assert target == current, f"/sbin/init -> {target}, expected {current}"
# TODO troubleshoot VM hot memory resizing which was introduced in 6.12
with subtest("[${image_id}] memory limits can be hotplug changed"):
server.set_instance_config(instance_name, "limits.memory 512MB")