Linux Is Best on Nostr: Here is the full version. The commands are update, logs and break up the logs daily, ...

Here is the full version. The commands are update, logs and break up the logs daily, and clean (both old logs and the system). I wanted the logs broken up into their own independent daily logs as not to be greeted with a wall of text.

Part of this code was me (my work), and part of this was ChatGPT.


# ----------------------------------------
# 🔄 Automatic NixOS Upgrades.
# ----------------------------------------

# Automatically checks for and installs system updates daily at 3:00 AM.
# It runs `nixos-rebuild switch --upgrade` and saves the output to a log file.
#
# ✅ What it does:
# • Downloads the latest NixOS packages.
# • Rebuilds your system with updates applied immediately (no reboot needed).
# • Saves upgrade logs to: /var/log/nixos-upgrade.log
#
# ⚠️ What it *doesn't* do:
# • ❌ Won't reboot your system — you'll need to restart manually.
# • ❌ Doesn't update Flatpak or home-manager apps.
#
# 📝 Tip: Change the time below if 3 AM doesn’t suit your schedule.

system.autoUpgrade = {
enable = true; # Enable automatic system upgrades.
persistent = true; # Remember missed upgrades and run ASAP after reboot.
dates = "03:00"; # When upgrades run daily — customize this time.
};

systemd.services.nixos-upgrade.serviceConfig = {
StandardOutput = "file:/var/log/nixos-upgrade.log"; # Logs upgrade output here.
StandardError = "inherit"; # Shows errors in system logs.
};

systemd.timers.nixos-upgrade.timerConfig.WakeSystem = true; # Wake system to run upgrades if asleep.


# ----------------------------------------
# 📑 Logrotate for Upgrade Logs.
# ----------------------------------------

# Rotates `/var/log/nixos-upgrade.log` daily to keep logs manageable.
# Keeps the last 7 days of logs (you can change `rotate 7` below).
#
# 📁 Logrotate state is stored at: /var/lib/logrotate/status
# Rotation runs daily at 4:30 AM — 90 minutes after the system upgrade.

# 🧾 Define logrotate rules.
# Change "rotate 7" below to keep more or fewer days.
environment.etc."logrotate.d/nixos-upgrade".text = ''
/var/log/nixos-upgrade.log {
daily
missingok
rotate 7
compress
delaycompress
notifempty
create 644 root root
}
'';


# 🛠️ Define the logrotate service.
systemd.services.logrotate-nixos-upgrade = {
description = "Logrotate for NixOS upgrade logs.";
enable = true;
serviceConfig = {
Type = "oneshot";
ExecStart = "${pkgs.logrotate}/bin/logrotate /etc/logrotate.d/nixos-upgrade --state /var/lib/logrotate/status";
};
};


# ⏰ Set the daily timer.
systemd.timers.logrotate-nixos-upgrade = {
description = "Daily Logrotate for NixOS upgrade logs.";
wantedBy = [ "timers.target" ];
timerConfig = {
OnCalendar = "*-*-* 04:30:00"; # Log rotation happens 90 minutes after the upgrade to avoid overlap.
Persistent = true;
WakeSystem = true;
};
};


# ----------------------------------------
# 🗑️ Weekly Garbage Collection.
# ----------------------------------------

# Cleans unused packages every Monday at 4 PM, waiting 24+ hours after updates to avoid issues.
#
# ✅ What it does:
# • Runs: "nix-collect-garbage -d".
# • Deletes unused system generations and packages.
# • Frees up disk space safely.
#
# ⚠️ What it doesn't do:
# • ❌ Won't remove your currently active or booted system configuration.
# • ❌ Doesn't reboot your machine.

# 📝 Tip: Adjust the times below to fit your schedule or preferences.


# Enable automatic garbage collection in Nix.
# This cleans up unused packages and old system generations regularly.
nix.gc = {
automatic = true;
dates = "Mon *-*-* 16:00"; # Monday, 4:00 PM - Change if you want a different day and time.
};

# Timer for running Nix's built-in automatic garbage collection
systemd.timers.nix-gc.timerConfig = {
WakeSystem = true;
Persistent = true;
};

# Custom service to wipe ALL old system generations manually.
# This is a more thorough cleanup, safely removing all old system snapshots.
systemd.services.nix-gc-wipe = {
description = "Wipe all old system generations";
serviceConfig = {
Type = "oneshot";
Environment = "PATH=/run/current-system/sw/bin";
ExecStart = "/bin/sh -c 'nix-env --delete-generations old --profile /nix/var/nix/profiles/system && nix-collect-garbage -d'";
};
};

# Timer to run the custom wipe service every Monday at 4:15 PM
systemd.timers.nix-gc-wipe = {
wantedBy = [ "timers.target" ];
timerConfig = {
OnCalendar = "Mon *-*-* 16:15:00"; # Monday, 4:15 PM - Change if you want a different day and time.
WakeSystem = true;
Persistent = true;
};
};

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