Allow creating ISO files for installing windows

deploy.fish

@@ -12,6 +12,7 @@ begin
     set -l setupLabel "winiso-valhalla"
     set -l buildDir "$(status dirname)/build"
     set -l cacheDir ~/.cache/winiso-valhalla
+    set -l isoFile "$buildDir/winiso-valhalla.iso"
     set -l winpe "$cacheDir/winpe.iso"
     set -l winPath "/media/win"
     set -l winpePath "/media/winpe"
@@ -20,6 +21,8 @@ begin
     set -l dataPath "/media/data"
     set -l winpeOverlay (mktemp -d)
     set -l winOverlay (mktemp -d)
+    set -l upperDir (mktemp -d)
+    set -l workDir (mktemp -d)
     set -l editionField "Edition ID"
     set -l wimFile "sources/install.wim"
 
@@ -113,8 +116,22 @@ begin
         end
     end
 
-    sudo mount --mkdir -t overlay overlay -o lowerdir="$winOverlay":"$winPath" "$valhallaPath"
+    sudo mount --mkdir -t overlay overlay -o lowerdir="$winOverlay":"$winpePath":"$winPath",upperdir="$upperDir",workdir="$workDir" "$valhallaPath"
 
+    if [ -z "$_flag_usb" ]
+        mkisofs \
+            -V "$setupLabel" \
+            -no-emul-boot \
+            -b "efi/microsoft/boot/efisys.bin" \
+            -iso-level 4 \
+            -udf \
+            -joliet \
+            -disable-deep-relocation \
+            -omit-version-number \
+            -relaxed-filenames \
+            -output "$isoFile" \
+            "$valhallaPath"
+    else
         if [ ! -b "$WIN_DISK" ]
             chooseDisk WIN_DISK
         end
@@ -176,4 +193,5 @@ begin
                 sudo rm -rf "$path"
             end
         end
+    end
 end