85 lines
2.6 KiB
Bash
Executable File
85 lines
2.6 KiB
Bash
Executable File
#!/usr/bin/env bash
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set -e
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# Days of nix generations to keep
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KEEP_DAYS=60
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# extra buffer before we trigger a GC
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BUFFER_DAYS=30
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# minimum number of generations to keep
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KEEP_MIN=5
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# Check for force flag
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FORCE_REBUILD=false
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if [[ "$1" == "-f" || "$1" == "--force" ]]; then
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FORCE_REBUILD=true
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fi
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# Source .env file
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if [ -f ".env" ]; then
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source .env
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else
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echo "Error: No .env file found. Copy .env.example to .env and set your NIXOS_HOST"
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exit 1
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fi
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if [ -z "$NIXOS_HOST" ]; then
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echo "Error: NIXOS_HOST not set in .env file"
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exit 1
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fi
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# Validate that the host configuration exists
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AVAILABLE_HOSTS=$(nix flake show --json 2>/dev/null | jq -r '.nixosConfigurations | keys[]' 2>/dev/null)
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if [ $? -ne 0 ] || [ -z "$AVAILABLE_HOSTS" ]; then
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echo "Warning: Could not validate host configuration. Proceeding anyway..."
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else
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if ! echo "$AVAILABLE_HOSTS" | grep -q "^$NIXOS_HOST$"; then
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echo "Error: Host '$NIXOS_HOST' not found in flake.nix"
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echo "Available hosts: $(echo $AVAILABLE_HOSTS | tr '\n' ' ')"
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exit 1
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fi
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fi
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# Early return if no changes were detected (unless forced)
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if [ "$FORCE_REBUILD" = false ] && git diff --quiet '*.nix' && git diff --quiet 'flake.lock'; then
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echo "No changes detected, exiting."
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exit 0
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fi
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# Autoformat your nix files
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alejandra . &>/dev/null \
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|| ( alejandra . ; echo "formatting failed!" && exit 1)
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# Shows your changes
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git diff -U0 '*.nix'
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echo "NixOS Rebuilding configuration for host: $NIXOS_HOST..."
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# First, run a check to see if the flake is valid
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# nix flake check 2>&1 | grep -i --color error && exit 1 # This just takes too long
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# Rebuild the system
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mkdir -p logs
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sudo nixos-rebuild switch --flake ./#$NIXOS_HOST &>logs/nixos-switch.log || (cat logs/nixos-switch.log | grep --color error && exit 1)
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# Get current generation metadata
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current=$(nixos-rebuild list-generations | grep current)
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# Commit all changes witih the generation metadata
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git commit -am "$NIXOS_HOST: $current"
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# Clean up old generations if conditions are met
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gens=$(nixos-rebuild list-generations | tail -n +2)
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# If there are less than KEEP_MIN generations, exit
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(( $(wc -l <<<"$gens") <= KEEP_MIN )) && exit 0
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# Get the oldest generation
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old=$(awk 'END{print $2" "$3}' <<<"$gens")
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# Calculate the age of the oldest generation in days
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age=$(( ( $(date +%s) - $(date -d "$old" +%s) )/86400 ))
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# If the age is greater than KEEP_DAYS+BUFFER_DAYS, delete the oldest generation
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(( age > KEEP_DAYS+BUFFER_DAYS )) || exit 0
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sudo nix-collect-garbage --delete-older-than ${KEEP_DAYS}d &>logs/nixos-gc.log || (cat logs/nixos-gc.log | grep --color error && exit 1)
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