ci: move arm64 tauri test to windows-2025

Use GitHub-hosted Windows for the temporary Tauri ARM64 test job because the Blacksmith Windows Build Tools image does not expose the ARM64 MSVC linker/libs we need. The hosted Windows images already include LLVM and VC.Tools.ARM64, so we can drop the custom installer and linker hacks.

.github/workflows/publish.yml

@@ -115,6 +115,8 @@ jobs:
             target: x86_64-apple-darwin
           - host: macos-latest
             target: aarch64-apple-darwin
+          - host: blacksmith-4vcpu-windows-2025
+            target: aarch64-pc-windows-msvc
           - host: blacksmith-4vcpu-windows-2025
             target: x86_64-pc-windows-msvc
           - host: blacksmith-4vcpu-ubuntu-2404
@@ -212,6 +214,27 @@ jobs:
           opencode-app-id: ${{ vars.OPENCODE_APP_ID }}
           opencode-app-secret: ${{ secrets.OPENCODE_APP_SECRET }}
 
+      - name: Setup Windows ARM64 clang
+        if: runner.os == 'Windows' && matrix.settings.target == 'aarch64-pc-windows-msvc'
+        shell: pwsh
+        run: |
+          $vswhere = Join-Path ${env:ProgramFiles(x86)} "Microsoft Visual Studio\Installer\vswhere.exe"
+          if (!(Test-Path $vswhere)) { throw "vswhere.exe not found at $vswhere" }
+          $root = & $vswhere -latest -products * -property installationPath
+          if (!$root) { throw "Visual Studio installation not found" }
+          $llvm = Join-Path $root "VC\Tools\Llvm"
+          $bin = @(
+            (Join-Path $llvm "x64\bin"),
+            (Join-Path $llvm "bin")
+          ) | Where-Object { Test-Path (Join-Path $_ "clang.exe") } | Select-Object -First 1
+          if (!$bin -and (Test-Path $llvm)) {
+            $bin = Get-ChildItem -Path $llvm -Filter clang.exe -Recurse -File | Select-Object -First 1 | ForEach-Object { $_.DirectoryName }
+          }
+          if (!$bin) { throw "clang.exe not found under $llvm" }
+          $env:PATH = "$bin;$env:PATH"
+          Add-Content -Path $env:GITHUB_PATH -Value $bin
+          clang --version
+
       - name: Build and upload artifacts
         uses: tauri-apps/tauri-action@390cbe447412ced1303d35abe75287949e43437a
         timeout-minutes: 60
@@ -254,6 +277,9 @@ jobs:
           - host: macos-latest
             target: aarch64-apple-darwin
             platform_flag: --mac --arm64
+          - host: "blacksmith-4vcpu-windows-2025"
+            target: aarch64-pc-windows-msvc
+            platform_flag: --win --arm64
           - host: "blacksmith-4vcpu-windows-2025"
             target: x86_64-pc-windows-msvc
             platform_flag: --win

.github/workflows/test-windows-arm64.yml

@@ -0,0 +1,122 @@
+name: test-windows-arm64
+
+on:
+  push:
+    branches:
+      - feat/windows-arm64-support
+  workflow_dispatch:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+permissions:
+  actions: read
+  contents: read
+
+jobs:
+  build-cli:
+    runs-on: blacksmith-4vcpu-ubuntu-2404
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: ./.github/actions/setup-bun
+
+      - name: Build
+        run: ./packages/opencode/script/build.ts
+        env:
+          OPENCODE_VERSION: 0.0.0-windows-arm64-test
+
+      - uses: actions/upload-artifact@v4
+        with:
+          name: opencode-cli
+          path: packages/opencode/dist
+
+  build-tauri:
+    needs: build-cli
+    runs-on: windows-2025
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-tags: true
+
+      - uses: ./.github/actions/setup-bun
+
+      - name: install Rust stable
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          targets: aarch64-pc-windows-msvc
+
+      - uses: Swatinem/rust-cache@v2
+        with:
+          workspaces: packages/desktop/src-tauri
+          shared-key: aarch64-pc-windows-msvc
+
+      - name: Create test config
+        shell: pwsh
+        run: |
+          $cfg = Get-Content "packages/desktop/src-tauri/tauri.prod.conf.json" -Raw | ConvertFrom-Json -AsHashtable
+          $cfg.bundle.createUpdaterArtifacts = $false
+          if ($cfg.plugins) { $cfg.plugins.Remove("updater") }
+          $cfg | ConvertTo-Json -Depth 100 | Set-Content "packages/desktop/src-tauri/tauri.test.conf.json"
+
+      - name: Prepare
+        run: |
+          cd packages/desktop
+          bun ./scripts/prepare.ts
+        env:
+          OPENCODE_VERSION: 0.0.0-windows-arm64-test
+          RUST_TARGET: aarch64-pc-windows-msvc
+          GH_TOKEN: ${{ github.token }}
+          GITHUB_RUN_ID: ${{ github.run_id }}
+
+      - name: Build and upload artifacts
+        uses: tauri-apps/tauri-action@390cbe447412ced1303d35abe75287949e43437a
+        timeout-minutes: 60
+        with:
+          projectPath: packages/desktop
+          uploadWorkflowArtifacts: true
+          args: --target aarch64-pc-windows-msvc --config ./src-tauri/tauri.test.conf.json --verbose
+          updaterJsonPreferNsis: true
+        env:
+          GITHUB_TOKEN: ${{ github.token }}
+
+  build-electron:
+    needs: build-cli
+    runs-on: blacksmith-4vcpu-windows-2025
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: ./.github/actions/setup-bun
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: "24"
+
+      - name: Prepare
+        run: bun ./scripts/prepare.ts
+        working-directory: packages/desktop-electron
+        env:
+          OPENCODE_VERSION: 0.0.0-windows-arm64-test
+          OPENCODE_CHANNEL: prod
+          RUST_TARGET: aarch64-pc-windows-msvc
+          GH_TOKEN: ${{ github.token }}
+          GITHUB_RUN_ID: ${{ github.run_id }}
+
+      - name: Build
+        run: bun run build
+        working-directory: packages/desktop-electron
+        env:
+          OPENCODE_CHANNEL: prod
+
+      - name: Package
+        run: npx electron-builder --win --arm64 --publish never --config electron-builder.config.ts
+        working-directory: packages/desktop-electron
+        timeout-minutes: 60
+        env:
+          OPENCODE_CHANNEL: prod
+
+      - uses: actions/upload-artifact@v4
+        with:
+          name: opencode-electron-aarch64-pc-windows-msvc
+          path: packages/desktop-electron/dist/*

packages/desktop-electron/scripts/finalize-latest-yml.ts

@@ -78,9 +78,17 @@ async function read(subdir: string, filename: string): Promise<LatestYml | undef
 
 const output: Record<string, string> = {}
 
-// Windows: single arch, pass through
-const win = await read("latest-yml-x86_64-pc-windows-msvc", "latest.yml")
-if (win) output["latest.yml"] = serialize(win)
+// Windows: merge arm64 + x64 into single file
+const winX64 = await read("latest-yml-x86_64-pc-windows-msvc", "latest.yml")
+const winArm64 = await read("latest-yml-aarch64-pc-windows-msvc", "latest.yml")
+if (winX64 || winArm64) {
+  const base = winArm64 ?? winX64!
+  output["latest.yml"] = serialize({
+    version: base.version,
+    files: [...(winArm64?.files ?? []), ...(winX64?.files ?? [])],
+    releaseDate: base.releaseDate,
+  })
+}
 
 // Linux x64: pass through
 const linuxX64 = await read("latest-yml-x86_64-unknown-linux-gnu", "latest-linux.yml")

packages/desktop-electron/scripts/utils.ts

@@ -19,6 +19,11 @@ export const SIDECAR_BINARIES: Array<{ rustTarget: string; ocBinary: string; ass
     ocBinary: "opencode-darwin-x64-baseline",
     assetExt: "zip",
   },
+  {
+    rustTarget: "aarch64-pc-windows-msvc",
+    ocBinary: "opencode-windows-arm64",
+    assetExt: "zip",
+  },
   {
     rustTarget: "x86_64-pc-windows-msvc",
     ocBinary: "opencode-windows-x64-baseline",
@@ -41,7 +46,7 @@ export const RUST_TARGET = Bun.env.RUST_TARGET
 function nativeTarget() {
   const { platform, arch } = process
   if (platform === "darwin") return arch === "arm64" ? "aarch64-apple-darwin" : "x86_64-apple-darwin"
-  if (platform === "win32") return "x86_64-pc-windows-msvc"
+  if (platform === "win32") return arch === "arm64" ? "aarch64-pc-windows-msvc" : "x86_64-pc-windows-msvc"
   if (platform === "linux") return arch === "arm64" ? "aarch64-unknown-linux-gnu" : "x86_64-unknown-linux-gnu"
   throw new Error(`Unsupported platform: ${platform}/${arch}`)
 }

packages/desktop/scripts/finalize-latest-json.ts

@@ -101,6 +101,7 @@ const targets = [
   { key: "linux-x86_64-rpm", asset: "opencode-desktop-linux-x86_64.rpm" },
   { key: "linux-aarch64-deb", asset: "opencode-desktop-linux-arm64.deb" },
   { key: "linux-aarch64-rpm", asset: "opencode-desktop-linux-aarch64.rpm" },
+  { key: "windows-aarch64-nsis", asset: "opencode-desktop-windows-arm64.exe" },
   { key: "windows-x86_64-nsis", asset: "opencode-desktop-windows-x64.exe" },
   { key: "darwin-x86_64-app", asset: "opencode-desktop-darwin-x64.app.tar.gz" },
   {
@@ -129,6 +130,7 @@ const alias = (key: string, source: string) => {
 
 alias("linux-x86_64", "linux-x86_64-deb")
 alias("linux-aarch64", "linux-aarch64-deb")
+alias("windows-aarch64", "windows-aarch64-nsis")
 alias("windows-x86_64", "windows-x86_64-nsis")
 alias("darwin-x86_64", "darwin-x86_64-app")
 alias("darwin-aarch64", "darwin-aarch64-app")

packages/desktop/scripts/utils.ts

@@ -11,6 +11,11 @@ export const SIDECAR_BINARIES: Array<{ rustTarget: string; ocBinary: string; ass
     ocBinary: "opencode-darwin-x64-baseline",
     assetExt: "zip",
   },
+  {
+    rustTarget: "aarch64-pc-windows-msvc",
+    ocBinary: "opencode-windows-arm64",
+    assetExt: "zip",
+  },
   {
     rustTarget: "x86_64-pc-windows-msvc",
     ocBinary: "opencode-windows-x64-baseline",

packages/opencode/package.json

@@ -35,6 +35,7 @@
     "@parcel/watcher-linux-arm64-musl": "2.5.1",
     "@parcel/watcher-linux-x64-glibc": "2.5.1",
     "@parcel/watcher-linux-x64-musl": "2.5.1",
+    "@parcel/watcher-win32-arm64": "2.5.1",
     "@parcel/watcher-win32-x64": "2.5.1",
     "@standard-schema/spec": "1.0.0",
     "@tsconfig/bun": "catalog:",

packages/opencode/script/build.ts

@@ -108,6 +108,10 @@ const allTargets: {
     arch: "x64",
     avx2: false,
   },
+  {
+    os: "win32",
+    arch: "arm64",
+  },
   {
     os: "win32",
     arch: "x64",

packages/opencode/src/file/ripgrep.ts

@@ -100,6 +100,7 @@ export namespace Ripgrep {
     },
     "x64-darwin": { platform: "x86_64-apple-darwin", extension: "tar.gz" },
     "x64-linux": { platform: "x86_64-unknown-linux-musl", extension: "tar.gz" },
+    "arm64-win32": { platform: "aarch64-pc-windows-msvc", extension: "zip" },
     "x64-win32": { platform: "x86_64-pc-windows-msvc", extension: "zip" },
   } as const