Smoke test Windows cmd installer wrapper

.github/workflows/ci.yml

@@ -88,6 +88,21 @@ jobs:
             $errors | ForEach-Object { Write-Error $_ }
             exit 1
           }
+      - name: cmd installer smoke check
+        shell: pwsh
+        run: |
+          $stub = Join-Path $PWD "dosh-install-smoke.ps1"
+          @'
+          param([string]$SmokeArg)
+          if ($SmokeArg -ne "ok") { throw "missing forwarded argument" }
+          $bindir = Join-Path $env:TEMP "dosh-smoke-bin"
+          if ($env:DOSH_INSTALL_BINDIR_FILE) {
+              [System.IO.File]::WriteAllText($env:DOSH_INSTALL_BINDIR_FILE, $bindir, [System.Text.Encoding]::ASCII)
+          }
+          '@ | Set-Content -Encoding ascii -NoNewline $stub
+          $cmd = 'set "DOSH_INSTALL_PS1={0}"&& call install.cmd ok&& echo ;!PATH!; | find /I ";{1}\dosh-smoke-bin;"' -f $stub, $env:TEMP
+          cmd /d /v:on /c $cmd
+          if ($LASTEXITCODE -ne 0) { exit $LASTEXITCODE }
       - name: Build Windows client
         run: cargo build --release --bin dosh-client --bin dosh-bench
       - name: Test Windows client

install.cmd

@@ -22,7 +22,11 @@ set "DOSH_INSTALL_PS1_URL=%SCRIPT_URL%"
 set "DOSH_INSTALL_PS1_PATH=%TMP_PS%"
 set "DOSH_INSTALL_BINDIR_FILE=%TMP_BINDIR%"
 
-"%PS%" -NoProfile -ExecutionPolicy Bypass -Command "$ErrorActionPreference='Stop'; $ProgressPreference='SilentlyContinue'; Invoke-WebRequest -UseBasicParsing -Uri $env:DOSH_INSTALL_PS1_URL -OutFile $env:DOSH_INSTALL_PS1_PATH"
+if exist "%SCRIPT_URL%" (
+    copy /Y "%SCRIPT_URL%" "%TMP_PS%" >nul
+) else (
+    "%PS%" -NoProfile -ExecutionPolicy Bypass -Command "$ErrorActionPreference='Stop'; $ProgressPreference='SilentlyContinue'; Invoke-WebRequest -UseBasicParsing -Uri $env:DOSH_INSTALL_PS1_URL -OutFile $env:DOSH_INSTALL_PS1_PATH"
+)
 if errorlevel 1 (
     del "%TMP_PS%" >nul 2>nul
     del "%TMP_BINDIR%" >nul 2>nul

tests/release_scripts.rs

@@ -100,6 +100,13 @@ fn release_gates_test_all_targets() {
             .contains("[System.Management.Automation.Language.Parser]::ParseFile(\"install.ps1\""),
         "Windows CI must parse the installer with PowerShell"
     );
+    assert!(
+        windows_client.contains("name: cmd installer smoke check")
+            && windows_client.contains("DOSH_INSTALL_PS1=")
+            && windows_client.contains("call install.cmd ok")
+            && windows_client.contains("find /I \";{1}\\dosh-smoke-bin;\""),
+        "Windows CI must execute the cmd wrapper against a local installer stub"
+    );
     assert!(
         windows_client.contains("run: cargo test --all-targets"),
         "Windows CI must run Rust tests, not only build/package"
@@ -259,6 +266,8 @@ fn windows_cmd_installer_wraps_native_powershell_installer() {
     assert!(cmd.contains("for %%P in (powershell.exe pwsh.exe powershell pwsh) do"));
     assert!(cmd.contains("set \"TMP_BINDIR=%TEMP%\\dosh-install-%RANDOM%-%RANDOM%.bindir\""));
     assert!(cmd.contains("set \"DOSH_INSTALL_BINDIR_FILE=%TMP_BINDIR%\""));
+    assert!(cmd.contains("if exist \"%SCRIPT_URL%\" ("));
+    assert!(cmd.contains("copy /Y \"%SCRIPT_URL%\" \"%TMP_PS%\""));
     assert!(cmd.contains("Invoke-WebRequest -UseBasicParsing"));
     assert!(cmd.contains("-ExecutionPolicy Bypass -File \"%TMP_PS%\" %*"));
     assert!(cmd.contains(