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overlayfs: Assert that upperdir == null requires systemd initrd

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This commit is contained in:
Will Fancher 2024-08-27 16:33:08 -04:00
parent 160ff9ff9c
commit c653608dcd
2 changed files with 23 additions and 13 deletions
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35
nixos/modules/tasks/filesystems/overlayfs.nix
View File

@ -127,18 +127,29 @@ in
boot.initrd.availableKernelModules = lib.mkIf (initrdFileSystems != { }) [ "overlay" ];
assertions = lib.concatLists (lib.mapAttrsToList
(_name: fs: [
{
assertion = (fs.overlay.upperdir == null) == (fs.overlay.workdir == null);
message = "You cannot define a `lowerdir` without a `workdir` and vice versa for mount point: ${fs.mountPoint}";
}
{
assertion = (fs.overlay.lowerdir != null && fs.overlay.upperdir == null) -> (lib.length fs.overlay.lowerdir) >= 2;
message = "A read-only overlay (without an `upperdir`) requires at least 2 `lowerdir`s: ${fs.mountPoint}";
}
])
config.fileSystems);
assertions =
lib.concatLists (
lib.mapAttrsToList (_name: fs: [
{
assertion = (fs.overlay.upperdir == null) == (fs.overlay.workdir == null);
message = "You cannot define a `lowerdir` without a `workdir` and vice versa for mount point: ${fs.mountPoint}";
}
{
assertion =
(fs.overlay.lowerdir != null && fs.overlay.upperdir == null)
-> (lib.length fs.overlay.lowerdir) >= 2;
message = "A read-only overlay (without an `upperdir`) requires at least 2 `lowerdir`s: ${fs.mountPoint}";
}
]) overlayFileSystems
)
++ lib.mapAttrsToList (_: fs: {
assertion = fs.overlay.upperdir == null -> config.boot.initrd.systemd.enable;
message = ''
Stage 1 overlay file system ${fs.mountPoint} has no upperdir,
which is not supported with scripted initrd. Please enable
'boot.initrd.systemd.enable'.
'';
}) initrdFileSystems;
boot.initrd.systemd.services = lib.mkMerge (lib.mapAttrsToList preMountService initrdFileSystems);
systemd.services = lib.mkMerge (lib.mapAttrsToList preMountService userspaceFileSystems);

1
nixos/tests/filesystems-overlayfs.nix
View File

@ -26,7 +26,6 @@ in
nodes.machine = { config, pkgs, ... }: {
boot.initrd.systemd.enable = true;
boot.initrd.availableKernelModules = [ "overlay" ];
virtualisation.fileSystems = {
"/initrd-overlay" = {