Linux create: cache the prefetches and show progress while downloading

README.md

@@ -7,7 +7,7 @@ App Sandbox is a virtual machine app for Windows and macOS that's focused on per
 
 Windows features:
 - Works on Windows 11 Home or Pro, without Hyper-V
-- Windows 11 or Ubuntu 26.04 LTS VM Support
+- Windows 11 or Ubuntu 24.04 / 26.04 LTS VM Support
 - Zero touch install
 - Copy and Paste
 - 2 Channel Audio

src/app_win/ui.c

@@ -131,7 +131,7 @@ static void build_host_info_json(JsonBuilder *jb)
     MEMORYSTATUSEX ms;
     DWORD host_cores, host_ram_mb;
     DWORD vm_cores = 0, vm_ram_mb = 0, vm_hdd_gb = 0;
-    wchar_t base_dir[MAX_PATH];
+    wchar_t base_dir[MAX_PATH], vm_dir[MAX_PATH];
     ULARGE_INTEGER free_bytes;
     DWORD free_gb = 0;
     int i, count = asb_vm_count();
@@ -148,9 +148,16 @@ static void build_host_info_json(JsonBuilder *jb)
         if (v) vm_hdd_gb += v->hdd_gb;
     }
 
+    /* Report free space on the volume that actually backs the VM data
+       directory (%ProgramData%\AppSandbox), not the %ProgramData% root.
+       Querying the leaf directory lets GetDiskFreeSpaceEx follow a junction /
+       mount point when the user has redirected VM storage to another drive.
+       Fall back to the root when the directory does not exist yet. */
     if (!GetEnvironmentVariableW(L"ProgramData", base_dir, MAX_PATH))
         wcscpy_s(base_dir, MAX_PATH, L"C:\\ProgramData");
-    if (GetDiskFreeSpaceExW(base_dir, &free_bytes, NULL, NULL))
+    swprintf_s(vm_dir, MAX_PATH, L"%s\\AppSandbox", base_dir);
+    if (GetDiskFreeSpaceExW(vm_dir, &free_bytes, NULL, NULL) ||
+        GetDiskFreeSpaceExW(base_dir, &free_bytes, NULL, NULL))
         free_gb = (DWORD)(free_bytes.QuadPart / (1024ULL * 1024 * 1024));
 
     jb_int(jb, L"hostCores", (int)host_cores);
@@ -207,6 +214,7 @@ static void build_vm_json(JsonBuilder *jb, int i)
     jb_bool(jb, L"buildingVhdx", v->building_vhdx);
     jb_bool(jb, L"vhdxStaging", v->vhdx_staging);
     jb_int(jb, L"vhdxProgress", v->vhdx_progress);
+    jb_string(jb, L"vhdxStep", v->vhdx_step);
     jb_bool(jb, L"installComplete", v->install_complete);
     jb_bool(jb, L"sshEnabled", v->ssh_enabled);
     jb_int(jb, L"sshPort", (int)v->ssh_port);

tools/linux/wsl-mesa/50-appsandbox-gpu

@@ -20,8 +20,20 @@
 WSL_MESA=/opt/wsl-mesa
 WSL_MESA_LIB="$WSL_MESA/lib/x86_64-linux-gnu"
 WSL_LIB=/usr/lib/wsl/lib
+# Distro Mesa's own d3d12 gallium driver (Ubuntu builds it for WSL). Used
+# when no wsl-mesa prebuilt exists for this release (only 26.04 ships one;
+# firstboot removes an ABI-incompatible one). Needs libdxcore/libd3d12,
+# which firstboot puts on the loader path from /opt/appsandbox/wsl-deps.
+STOCK_D3D12=/usr/lib/x86_64-linux-gnu/dri/d3d12_dri.so
 
-if [ -e /dev/dxg ] && [ -d "$WSL_MESA_LIB" ]; then
+if [ -e /dev/dxg ] && [ ! -d "$WSL_MESA_LIB" ] && [ -e "$STOCK_D3D12" ]; then
+    echo "LD_LIBRARY_PATH=$WSL_LIB"
+    echo "GALLIUM_DRIVER=d3d12"
+    echo "MESA_LOADER_DRIVER_OVERRIDE=d3d12"
+    echo "__GLX_VENDOR_LIBRARY_NAME=mesa"
+    # No VK_DRIVER_FILES: stock mesa-vulkan-drivers has no dzn ICD on
+    # 24.04, so Vulkan stays on lavapipe. OpenGL apps still hit the GPU.
+elif [ -e /dev/dxg ] && [ -d "$WSL_MESA_LIB" ]; then
     # LD_LIBRARY_PATH covers two needs:
     #   - $WSL_MESA_LIB picks Mesa's d3d12 gallium + dzn Vulkan over stock.
     #   - $WSL_LIB lets apps that dlopen the WSL NVIDIA userspace libs by

tools/linux/wsl-mesa/appsandbox-gpu

@@ -23,8 +23,17 @@ WSL_MESA=/opt/wsl-mesa
 WSL_MESA_LIB="$WSL_MESA/lib/x86_64-linux-gnu"
 WSL_MESA_VK_ICD="$WSL_MESA/share/vulkan/icd.d/dzn_icd.x86_64.json"
 WSL_LIB=/usr/lib/wsl/lib
+# Distro Mesa's d3d12 driver: the fallback when this release has no
+# wsl-mesa prebuilt (see 50-appsandbox-gpu). OpenGL only; Vulkan stays
+# on lavapipe because stock mesa-vulkan-drivers ships no dzn ICD.
+STOCK_D3D12=/usr/lib/x86_64-linux-gnu/dri/d3d12_dri.so
 
-if [ -e /dev/dxg ] && [ -d "$WSL_MESA_LIB" ]; then
+if [ -e /dev/dxg ] && [ ! -d "$WSL_MESA_LIB" ] && [ -e "$STOCK_D3D12" ]; then
+    export LD_LIBRARY_PATH="$WSL_LIB${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH}"
+    export __GLX_VENDOR_LIBRARY_NAME=mesa
+    export GALLIUM_DRIVER=d3d12
+    export MESA_LOADER_DRIVER_OVERRIDE=d3d12
+elif [ -e /dev/dxg ] && [ -d "$WSL_MESA_LIB" ]; then
     # LD_LIBRARY_PATH covers two needs:
     #   - $WSL_MESA_LIB picks Mesa's d3d12 gallium + dzn Vulkan over stock.
     #   - $WSL_LIB lets apps that dlopen the WSL NVIDIA userspace libs by

web/app.js

@@ -649,7 +649,12 @@ function updateStatusCell(td, vm) {
 
     if (vm.buildingVhdx) {
         needsSpinner = true;
-        label = vm.vhdxStaging ? 'Staging files... ' : 'Building Disk (' + (vm.vhdxProgress || 0) + '%) ';
+        /* vhdxStep names the current phase ("Downloading packages 42/182",
+           "Building rootfs", ...); the prefetch downloads used to sit at
+           "Building Disk (0%)" for minutes and look hung. */
+        if (vm.vhdxStaging)      label = 'Staging files... ';
+        else if (vm.vhdxStep)    label = vm.vhdxStep + ' (' + (vm.vhdxProgress || 0) + '%) ';
+        else                     label = 'Building Disk (' + (vm.vhdxProgress || 0) + '%) ';
         className = 'status-building';
     } else if (vm.running && vm.shuttingDown) {
         className = 'status-shutting-down';