Hi guys,
I used the following snipped in /etc/nixos/configuration.nix to ensure
that my machine always has about 15GB of free disk space:
nix.gc = {
automatic = true;
dates = "05,11,17,23:15";
options = ''--max-freed "$((15 * 1024**3 - 1024 * $(df -P -k /nix/store |
tail -n 1 | ${pkgs.gawk}/bin/awk '{ print $4 }')))"'';
};
It seems, though, as if that configuration no longer works:
# journalctl _SYSTEMD_UNIT=nix-gc.service
[...]
Oct 19 05:15:00 hydra nix-collect-garbage[21595]: error: `--max-freed'
requires an argument
Oct 19 05:15:00 hydra nix-collect-garbage[21595]: Try `nix-store --help' for
more information.
Is it possible that the "ExecStart" field used to define nix-gc.service
stopped accepting shell syntax like $((...)) at some point?
Is this a new systemd "feature"?
Take care,
Peter
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