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Expand tmpfs and enable zram swap before disko to fix out-of-space errors

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Elias Kohout
2026-04-07 14:36:52 +02:00
parent 5976c858d7
commit fa5ae9ee45
1 changed files with 16 additions and 8 deletions
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flake.nix
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@@ -189,24 +189,32 @@
if grep -q "tmpfs /nix/.rw-store" /proc/mounts 2>/dev/null; then if grep -q "tmpfs /nix/.rw-store" /proc/mounts 2>/dev/null; then
echo "ISO environment detected - running full install for: $HOSTNAME" echo "ISO environment detected - running full install for: $HOSTNAME"
# Step 1: Partition and format disk # Step 1: Expand tmpfs and set up zram swap BEFORE downloading anything
echo "--- Step 1/4: Running disko ---" echo "--- Step 1/4: Expanding tmpfs and enabling zram swap ---"
sudo mount -o remount,size=4G /nix/.rw-store
if sudo modprobe zram 2>/dev/null; then
echo 2G | sudo tee /sys/block/zram0/disksize > /dev/null
sudo mkswap /dev/zram0
sudo swapon /dev/zram0
echo "zram swap enabled"
else
echo "zram not available, continuing without it"
fi
# Step 2: Partition and format disk
echo "--- Step 2/4: Running disko ---"
sudo nix --extra-experimental-features "nix-command flakes" run \ sudo nix --extra-experimental-features "nix-command flakes" run \
github:nix-community/disko/latest -- \ github:nix-community/disko/latest -- \
--mode destroy,format,mount \ --mode destroy,format,mount \
--flake "$FLAKE_DIR#$HOSTNAME" --flake "$FLAKE_DIR#$HOSTNAME"
# Step 2: Create swap file on installed root to relieve RAM pressure # Step 3: Create swap file on installed root for nixos-install
echo "--- Step 2/4: Creating 2GB swap file ---" echo "--- Step 3/4: Creating 2GB swap file on target disk ---"
sudo dd if=/dev/zero of=/mnt/swapfile bs=1M count=2048 status=progress sudo dd if=/dev/zero of=/mnt/swapfile bs=1M count=2048 status=progress
sudo chmod 600 /mnt/swapfile sudo chmod 600 /mnt/swapfile
sudo mkswap /mnt/swapfile sudo mkswap /mnt/swapfile
sudo swapon /mnt/swapfile sudo swapon /mnt/swapfile
# Step 3: Expand /nix/.rw-store tmpfs (default is too small for install)
echo "--- Step 3/4: Expanding /nix/.rw-store to 3G ---"
sudo mount -o remount,size=3G /nix/.rw-store
# Step 4: Install NixOS # Step 4: Install NixOS
echo "--- Step 4/4: Running nixos-install ---" echo "--- Step 4/4: Running nixos-install ---"
sudo nixos-install --flake "$FLAKE_DIR#$HOSTNAME" sudo nixos-install --flake "$FLAKE_DIR#$HOSTNAME"