| 7 Jun 2025 |
 musicmatze | Is Disko able to add to my existing zfs datasets? | 18:16:57 |
| musicmatze | So if I create a new dataset in the config, will it generate it upon nixos-rebuild? | 18:17:19 |
 Sandro 🐧 | I don't think so | 18:25:38 |
| Sandro 🐧 | at least I have been always manually reconciling that | 18:25:43 |
 lassulus | theoretically you can run the format part of the script again | 19:22:28 |
| lassulus | but better check what it would run beforehand :) | 19:22:37 |
| musicmatze | So if I add Disko as a module to my configuration, and add another dataset there, it does not get automatically created?
What is the expected way to do it then? Create the dataset by hand and then add it to fileSystems? | 19:24:52 |
| lassulus | no, add it to the disko config and either create it manually or run what is in config.system.build.format | 19:27:22 |
| musicmatze | That sounds much better 😉 | 19:30:47 |
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| 8 Jun 2025 |
 rocky ((λ💝.💝)💐) (she/they; ask before DM please) | No, I’m using the command I saw in the README:
sudo nix --experimental-features "nix-command flakes" run github:nix-community/disko/latest -- --mode destroy,format,mount ./etc/nixos/disk-config.nix, which I run inside /mnt with my configurations | 00:26:16 |
| rocky ((λ💝.💝)💐) (she/they; ask before DM please) | I’ll work on that pastebin for you. | 01:37:59 |
| musicmatze | Hello again.
If I use disko to set up my ZFS datasets, but do not mount them during boot (because they are encrypted and the machine must boot without attendence), how can I get the path where ZFS would mount the dataset if I manually zfs mount -a (for example)?
Right now all I can see is (in nix repl): outputs.nixosConfigurations.myHost.config.disko.devices.zpool.zroot.datasets."myDataSet"._name - which does look like something internal I should not base my configuration on, should I?
Because the dataset is not marked for automatic mounting, the attribute outputs.nixosConfigurations.myHost.config.disko.devices.zpool.zroot.datasets."myDataSet".mountpoint is null.
| 08:55:41 |
 phaer | If you don't set a static mountpoint in your disko config, I don't think it's possible for the general case during eval time. I think if you leave it empty the default should just be "/${dataset.name}"?
During run time you could just do "zfs get mountpoint dataset" | 12:31:07 |
| musicmatze | So from what I found during research is that I should use options.mountpoint = "legacy"; and then declare my fileSystems with the filesystems that should be mounted automatically, and for others I must find a better way. Like hard coding stuff maybe | 13:07:10 |
| musicmatze | So... Can I just write my own systemd mount unit for datasets I do not want to mount automatically? And if yes, how can I tell systemd that the dataset encryption password has to be retrieved from the user? I suppose there's ways...
Because with a unit, I can make other units depend on it (like for starting navidrome only if the dataset with the music is mounted) | 13:13:34 |
| 9 Jun 2025 |
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| schuelermine | Is there a way to configure a swap file using Disko? | 20:14:09 |
| schuelermine | specifically, a swap file on an ext4 in LUKS partition | 20:14:21 |
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| 10 Jun 2025 |
|  caraiiwala joined the room. | 00:26:37 |
| caraiiwala | I'm new to ZFS and trying to convert my RAID setup to Disko. The deployment with nixos-anywhere was successful, but once rebooted, the system failed to boot. Here is my disko configuration:
{
disko.devices = {
disk = {
root = {
type = "disk";
device = "/dev/disk/by-id/...";
content.type = "gpt";
content.partitions = {
ESP = {
type = "EF00";
size = "64M";
content = {
type = "filesystem";
format = "vfat";
mountpoint = "/boot";
};
};
zfs = {
size = "100%";
content.type = "zfs";
content.pool = "root";
};
};
};
raid-1 = {
type = "disk";
device = "/dev/disk/by-id/...";
content.type = "gpt";
content.partitions.zfs = {
size = "100%";
content.type = "zfs";
content.pool = "raid";
};
};
raid-2 = {
type = "disk";
device = "/dev/disk/by-id/...";
content.type = "gpt";
content.partitions.zfs = {
size = "100%";
content.type = "zfs";
content.pool = "raid";
};
};
raid-3 = {
type = "disk";
device = "/dev/disk/by-id/...";
content.type = "gpt";
content.partitions.zfs = {
size = "100%";
content.type = "zfs";
content.pool = "raid";
};
};
};
zpool = {
root = {
type = "zpool";
rootFsOptions.mountpoint = "none";
datasets = {
root.type = "zfs_fs";
root.mountpoint = "/";
home.type = "zfs_fs";
home.mountpoint = "/home";
};
};
raid = {
type = "zpool";
rootFsOptions.mountpoint = "none";
mode.topology.type = "topology";
mode.topology.vdev = [
{
mode = "raidz1";
members = ["raid-1" "raid-2" "raid-3"];
}
];
datasets.raid = {
type = "zfs_fs";
mountpoint = "/mnt/raid";
};
};
};
};
}
| 00:45:00 |
 shelvacu | you need to either use dataset option mountpoint=legacy and configure mountpoints with usual fstab (which i recommend for root fs, "legacy" is a misnomer) or tell zfs to run an import in initrd | 01:20:28 |
| shelvacu | https://search.nixos.org/options?channel=25.05&show=boot.zfs.extraPools&from=0&size=50&sort=relevance&type=packages&query=boot+zfs | 01:21:45 |
| caraiiwala | Thanks for responding. I actually tried booting it with an even simpler non-ZFS config and I'm having the same issue:
disko.devices = {
disk = {
root = {
type = "disk";
device = "/dev/disk/by-id/scsi-36b82a720cf60ce002fd94d2e2991b17e";
content.type = "gpt";
content.partitions = {
ESP = {
type = "EF00";
size = "64M";
content = {
type = "filesystem";
format = "vfat";
mountpoint = "/boot";
mountOptions = ["umask=077"];
};
};
root = {
size = "100%";
content.type = "filesystem";
content.format = "ext4";
content.mountpoint = "/";
};
};
};
};
};
| 01:28:56 |
| caraiiwala | So now I'm very confused | 01:29:13 |
| caraiiwala | Well I've just tried an identical simple config on another system and it worked fine | 02:03:10 |
