optimise cache store

Author: Lillecarl

environments/cache/default.nix

@@ -26,6 +26,7 @@ let
           #   log-type = "file";
           #   logfile = "/var/log/nix-serve-ng.log";
           # };
+          services.gc.env.IS_CACHE = "true";
           # Umbrella service for cache
           services.cache = {
             type = "internal";

environments/modules/gc.nix

@@ -34,14 +34,18 @@
           ''
             while :; do
               # Copy everything to cache
-              CACHE_ENABLED="''${CACHE_ENABLED:-false}"
+              CACHE_ENABLED="''${CACHE_ENABLED:-"false"}"
+              IS_CACHE="''${IS_CACHE:-"false"}"
               if test "$CACHE_ENABLED" = "true"; then
                 nix copy --all --store local --to ssh-ng://nix@nix-cache || true
               fi
               # Garbage collect anything older than an hour
               nix path-info --store local --all --json | \
                 jq -r --argjson age ${rs} 'map(select(.registrationTime < (now - $age)) | .path) | .[]' | \
                 nix store delete --store local --stdin --skip-live
+              if test "$IS_CACHE" = "true"; then
+                nix store optimise
+              fi
               # chill
               SLEEP=$(shuf -i ${lis}-${uis} -n 1)
               echo Sleeping for "$SLEEP" seconds