jungle/m/common/base/nix.nix
Rodrigo Arias Mallo 9a9161fc55 Delay nix-gc until /home is mounted
Prevents starting the garbage collector before the remote FS are
mounted, in particular /home. Otherwise, all the gcroots which have
symlinks in /home will be considered stale and they will be removed.

See: #79
Reviewed-by: Aleix Roca Nonell <aleix.rocanonell@bsc.es>
2024-09-20 09:45:30 +02:00

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{ pkgs, nixpkgs, bscpkgs, theFlake, ... }:
{
nixpkgs.overlays = [
bscpkgs.bscOverlay
(import ../../../pkgs/overlay.nix)
];
nix = {
nixPath = [
"nixpkgs=${nixpkgs}"
"jungle=${theFlake.outPath}"
];
registry = {
nixpkgs.flake = nixpkgs;
jungle.flake = theFlake;
};
settings = {
experimental-features = [ "nix-command" "flakes" ];
sandbox = "relaxed";
trusted-users = [ "@wheel" ];
flake-registry = pkgs.writeText "global-registry.json"
''{"flakes":[],"version":2}'';
};
gc = {
automatic = true;
dates = "weekly";
options = "--delete-older-than 30d";
};
};
# The nix-gc.service can begin its execution *before* /home is mounted,
# causing it to remove all gcroots considering them as stale, as it cannot
# access the symlink. To prevent this problem, we force the service to wait
# until /home is mounted as well as other remote FS like /ceph.
systemd.services.nix-gc = {
# Start remote-fs.target if not already being started and fail if it fails
# to start. It will also be stopped if the remote-fs.target fails after
# starting successfully.
bindsTo = [ "remote-fs.target" ];
# Wait until remote-fs.target fully starts before starting this one.
after = [ "remote-fs.target"];
# Ensure we can access a remote path inside /home
unitConfig.ConditionPathExists = "/home/Computational";
};
# This value determines the NixOS release from which the default
# settings for stateful data, like file locations and database versions
# on your system were taken. Its perfectly fine and recommended to leave
# this value at the release version of the first install of this system.
# Before changing this value read the documentation for this option
# (e.g. man configuration.nix or on https://nixos.org/nixos/options.html).
system.stateVersion = "22.11"; # Did you read the comment?
}