Added mirror configuration

config-files/disks/mirror.nix

@@ -0,0 +1,44 @@
+
+    # Data mirror configuration generated by deploy.sh
+    disk = {
+      "content-1" = {
+        type = "disk";
+        device = "${CONTENT_DISK_1}";
+        content = {
+          type = "gpt";
+          partitions = {
+            "data-1" = {
+              size = "100%";
+              content = {
+                type = "luks";
+                name = "crypted-content-1";
+                settings.keyFile = "/etc/secrets/disks/content-disk-1";
+              };
+            };
+          };
+        };
+      };
+      "parity-1" = {
+        type = "disk";
+        device = "${PARITY_DISK_1}";
+        content = {
+          type = "gpt";
+          partitions = {
+            "parity-1" = {
+              size = "100%";
+              content = {
+                type = "luks";
+                name = "crypted-parity-1";
+                settings.keyFile = "/etc/secrets/disks/parity-disk-1";
+              };
+            };
+          };
+        };
+      };
+    };
+    mdadm.raid-devices = [ "/dev/mapper/crypted-content-1" "/dev/mapper/crypted-parity-1" ];
+    fs."/dev/md/data-storage" = {
+      type = "xfs";
+      label = "data-storage";
+      mountpoint = "/mnt/data-storage";
+    };

deploy.sh

@@ -377,18 +377,42 @@ disk_config_generation() {
       num_parity=0
       num_content=0
 
-      if (( num_selected == 1 )); then # If only one data disk is selected, it is a content disk
+      if (( num_selected == 2 )); then
+        # Special case for 2 data disks: create a mirror.
+        echo -e "\n  ✅ Two data disks detected, creating a mirror configuration."
+
+        disk1_name=${selected_data_names[0]}
+        disk2_name=${selected_data_names[1]}
+        disk1_size=${DISK_SIZE_MAP[$disk1_name]}
+        disk2_size=${DISK_SIZE_MAP[$disk2_name]}
+
+        if [[ "$disk1_size" -ne "$disk2_size" ]]; then
+            gum style --border normal --margin "1" --padding "1 2" --border-foreground 212 "⚠️  The two selected disks for the mirror have different sizes. The mirror will be created using the size of the smaller disk, and the extra space on the larger disk will be unused."
+            gum confirm "Do you want to proceed anyway?" || { echo "  ❌ Aborting as requested."; exit 1; }
+        fi
+
+        export CONTENT_DISK_1=${DISK_BY_ID_MAP[${selected_data_names[0]}]}
+        export PARITY_DISK_1=${DISK_BY_ID_MAP[${selected_data_names[1]}]}
+        export CONTENT_DISK_1_KEY_VAR="CONTENT_DISK_1_KEY"
+        export PARITY_DISK_1_KEY_VAR="PARITY_DISK_1_KEY"
+        export CONTENT_DISK_1_KEY=${!CONTENT_DISK_1_KEY_VAR}
+        export PARITY_DISK_1_KEY=${!PARITY_DISK_1_KEY_VAR}
+        (envsubst < "config-files/disks/mirror.nix") >> ./nix-config/disks/disko.nix
+        NUMBER_OF_CONTENT_DISKS=1 # For summary and key generation
+        NUMBER_OF_PARITY_DISKS=1
+
+      elif (( num_selected == 1 )); then # If only one data disk is selected, it is a content disk
         num_content=1
         num_parity=0
-      elif (( num_selected > 1 )); then # If more than one data disk is selected
+      elif (( num_selected > 2 )); then # If more than two data disks are selected
         # 1 parity for up to 2 content disks.
         num_parity=$(( (num_selected + 2) / 3 ))
         num_content=$(( num_selected - num_parity ))
       fi
 
-      # Sort selected disks by size (largest first)
+      if (( num_selected != 2 )); then
+        # Sort selected disks by size (largest first) for snapraid
         sorted_disks=($(
-        # shellcheck disable=SC2145
           for name in "${selected_data_names[@]}"; do
             echo "${DISK_SIZE_MAP[$name]} $name"
           done | sort -rn | awk '{print $2}'
@@ -410,6 +434,7 @@ disk_config_generation() {
         for i in {0..5}; do export "CONTENT_DISK_$((i+1))"="${content_disks_final[$i]:-}"; done
         for i in {0..2}; do export "PARITY_DISK_$((i+1))"="${parity_disks_final[$i]:-}"; done
       fi
+    fi
   else
     echo -e "\n\n  ⚠️ No remaining disks to select for data."
   fi
@@ -459,6 +484,7 @@ EOF
   (envsubst < "$template_file") > ./nix-config/disks/disko.nix
   echo -e "\n  ✅ Generated boot disk configuration."
 
+  if (( NUMBER_OF_CONTENT_DISKS != 2 )); then
     for i in $(seq 1 $NUMBER_OF_CONTENT_DISKS); do
       disk_var="CONTENT_DISK_$i"
       export DISK_NUMBER=$i
@@ -474,6 +500,7 @@ EOF
       (envsubst < "config-files/disks/parity.nix") >> ./nix-config/disks/disko.nix
     done
     [[ "$NUMBER_OF_PARITY_DISKS" -gt 0 ]] && echo -e "\n  ✅ Generated $NUMBER_OF_PARITY_DISKS parity disk configuration(s)."
+  fi
 
   # Close the disko.nix block
   cat <<'EOF' >> ./nix-config/disks/disko.nix