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profiles/base/ccache/default.nix

@@ -7,6 +7,7 @@
 
 # serge <3
 # TODO: distributed (s)ccache (with redis?)
+# TODO: garbage collect this
 
 {
   programs.ccache.enable = true;

profiles/base/nix.nix

@@ -14,12 +14,21 @@
     !include ${config.sops.secrets.nix-access-tokens-all.path}
   '';
 
+  # https://nix.dev/manual/nix/stable/command-ref/conf-file.html
+  # https://nix.dev/manual/nix/latest/command-ref/conf-file.html
+  # https://docs.lix.systems/manual/lix/stable/command-ref/conf-file.html
   nix.settings = {
+
+    # === behaviour
     experimental-features = [
       "nix-command"
       "flakes"
       # "pipe-operator" # not supported on lix 2.91
     ];
+    log-lines = 35;
+    # keep-going = true;
+
+    # === access
     #nix.settings.allowed-users = [ "@builders" ]; # TODO: this
     allowed-users = [
       # default is [ "*" ]
@@ -30,13 +39,20 @@
       "root"
       "@wheel"
     ];
+
+    # === eval and realization
     keep-derivations = true; # keep .drv in store, great with nix-diff
+    max-silent-time = 3600; # kill long-running silent builds
+
+    # === substitution
+    connect-timeout = 5; # timeout in seconds for binary caches
+    download-attempts = lib.mkDefault 2; # download attempts, in case a binary cache fails
+    # fallback = lib.mkDefault true; # fallback to building if a binary cache fails
+
+    # === store
+    #settings.keep-failed = true; # fills up $TMPDIR
     auto-optimise-store = true; # deduplicate with hardlinks, expensive. Alternative: nix-store --optimise
-    max-silent-time = 3600;
-    connect-timeout = 5; # seconds timeout for binary caches
-    #nix.settings.keep-failed = true; # fills up $TMPDIR
-    log-lines = 35;
-    min-free = 3 * 1024 * 1024 * 1024; # starts cg
+    min-free = 5 * 1024 * 1024 * 1024; # starts cg
     max-free = 20 * 1024 * 1024 * 1024; # condition to end gc triggered by min-free
 
     # should not be needed since https://github.com/NixOS/nixpkgs/pull/383052
@@ -53,8 +69,9 @@
         ];
   };
 
+  #nix.optimize.automatic = true; # periodic store optimization, alternative nix.settings.auto-optimise-store
+
   nix.gc = {
-    #nix.optimize.automatic = true; # periodic optimization
     automatic = true;
     dates = "weekly";
     options = lib.mkIf config.system.autoUpgrade.enable "--delete-older-than 15d";