configuration.nix

@@ -26,6 +26,13 @@
   nix.settings = {
     experimental-features = [ "nix-command" "flakes" ];
     download-buffer-size = 524288000;
+
+    # Network resilience for cache.nixos.org (Fastly) flakiness.
+    connect-timeout = 10;          # fail-fast on dead TCP connects (default: 0 = unlimited)
+    stalled-download-timeout = 90; # default 300s; retry sooner on stalled transfers
+    download-attempts = 7;         # default 5
+    http-connections = 25;         # cap concurrency (helps MTU/middlebox paths)
+    fallback = true;               # build locally if a substitute can't be fetched
   };
 
   # ── Networking ──────────────────────────────────────────────

modules/core/sovran-hub.nix

@@ -138,7 +138,11 @@ let
     RC=0
 
     echo "── Step 1/3: nix flake update ────────────────────"
-    if ! nix flake update --flake /etc/nixos --print-build-logs 2>&1; then
+    if ! nix flake update --flake /etc/nixos --print-build-logs \
+          --option connect-timeout 10 \
+          --option stalled-download-timeout 90 \
+          --option download-attempts 7 \
+          --option fallback true 2>&1; then
       echo "[ERROR] nix flake update failed"
       RC=1
     fi
@@ -146,7 +150,11 @@ let
 
     if [ "$RC" -eq 0 ]; then
       echo "── Step 2/3: nixos-rebuild ──────────────────────────"
-      SWITCH_OUT=$(nixos-rebuild switch --flake /etc/nixos --print-build-logs 2>&1)
+      SWITCH_OUT=$(nixos-rebuild switch --flake /etc/nixos --print-build-logs \
+        --option connect-timeout 10 \
+        --option stalled-download-timeout 90 \
+        --option download-attempts 7 \
+        --option fallback true 2>&1)
       SWITCH_RC=$?
       echo "$SWITCH_OUT"
       if [ "$SWITCH_RC" -eq 0 ]; then
@@ -155,7 +163,11 @@ let
         echo ""
         echo "  ✓ Build succeeded — a reboot is required to apply this update"
         echo "  (Critical system components changed; running nixos-rebuild boot instead)"
-        if nixos-rebuild boot --flake /etc/nixos --print-build-logs 2>&1; then
+        if nixos-rebuild boot --flake /etc/nixos --print-build-logs \
+             --option connect-timeout 10 \
+             --option stalled-download-timeout 90 \
+             --option download-attempts 7 \
+             --option fallback true 2>&1; then
           echo "REBOOT_REQUIRED" > "$STATUS"
           exit 0
         else
@@ -209,7 +221,11 @@ let
     echo "══════════════════════════════════════════════════"
     echo ""
     echo "── Rebuilding system configuration ──────────────"
-    SWITCH_OUT=$(nixos-rebuild switch --flake /etc/nixos --print-build-logs 2>&1)
+    SWITCH_OUT=$(nixos-rebuild switch --flake /etc/nixos --print-build-logs \
+      --option connect-timeout 10 \
+      --option stalled-download-timeout 90 \
+      --option download-attempts 7 \
+      --option fallback true 2>&1)
     SWITCH_RC=$?
     echo "$SWITCH_OUT"
     if [ "$SWITCH_RC" -eq 0 ]; then
@@ -222,7 +238,11 @@ let
       echo ""
       echo "  ✓ Build succeeded — a reboot is required to apply this rebuild"
       echo "  (Critical system components changed; running nixos-rebuild boot instead)"
-      if nixos-rebuild boot --flake /etc/nixos --print-build-logs 2>&1; then
+      if nixos-rebuild boot --flake /etc/nixos --print-build-logs \
+           --option connect-timeout 10 \
+           --option stalled-download-timeout 90 \
+           --option download-attempts 7 \
+           --option fallback true 2>&1; then
         echo "REBOOT_REQUIRED" > "$STATUS"
       else
         echo "[ERROR] nixos-rebuild boot also failed"