Created
November 14, 2017 01:29
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| {pkgs, lib, ... }: | |
| let | |
| pinRollback = pkgs.writeShellScriptBin "ar-pin-rollback" | |
| '' | |
| CURVERSION=$(nix-env --list-generations -p /nix/var/nix/profiles/system | grep -Po '([0-9]+)(?=\s+[0-9 -]+ [0-9 :]+\s*\(current\))') | |
| echo Setting /nix/var/nix/rollback-version to $CURVERSION | |
| echo $CURVERSION > /nix/var/nix/rollback-version | |
| ''; | |
| showGenerations = pkgs.writeShellScriptBin "ar-show-generations" | |
| '' | |
| nix-env --list-generations -p /nix/var/nix/profiles/system | |
| ''; | |
| showRollback = pkgs.writeShellScriptBin "ar-show-rollback" | |
| '' | |
| cat /nix/var/nix/rollback-version | |
| ''; | |
| in | |
| { | |
| systemd.services.ar-rollback = { | |
| path = [ pkgs.nix ?????.nixos-rebuild ]; | |
| environment = { | |
| HOME="/root"; | |
| }; | |
| script = '' | |
| CURVERSION=$(nix-env --list-generations -p /nix/var/nix/profiles/system | grep -Po '([0-9]+)(?=\s+[0-9 -]+ [0-9 :]+\s*\(current\))') | |
| CURVERSIONTIME=$(date -d "$(nix-env --list-generations -p /nix/var/nix/profiles/system | grep -Po '(([0-9-]+ [0-9 :]+))(?=\s*\(current\))')" +%s) | |
| TRIGGERTIME=$(date -d -20minutes +%s) | |
| if [ ! -f /nix/var/nix/rollback-version ]; then | |
| echo $CURVERSION > /nix/var/nix/rollback-version | |
| fi | |
| ROLLBACKVERSION=$(cat /nix/var/nix/rollback-version) | |
| if [[ "$CURVERSION" > `cat /nix/var/nix/rollback-version` ]] ; then | |
| if [ `nix-env --list-generations -p /nix/var/nix/profiles/system | wc -l` > 0 ]; then | |
| if [ $CURVERSIONTIME -lt $TRIGGERTIME ]; then | |
| echo "Rolling back from $CURVERSION towards $ROLLBACKVERSION" | |
| nixos-rebuild switch --rollback | |
| else | |
| echo "Not yet rolling back from $CURVERSION towards $ROLLBACKVERSION" | |
| fi | |
| fi | |
| fi | |
| ''; | |
| }; | |
| systemd.timers.ar-rollback = { | |
| timerConfig = { OnCalendar = "*:0/5"; | |
| Unit = "ar-rollback.service"; | |
| AccuracySec = "1sec"; | |
| }; | |
| wantedBy = [ "timers.target" ]; | |
| }; | |
| environment.systemPackages = [ | |
| pinRollback | |
| showGenerations | |
| showRollback | |
| ]; | |
| } |
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Not sure on what ????? should be on line 33