Download MSI file from PowerShell script

Author: johndowns

Dockerfile

@@ -3,8 +3,6 @@ FROM mcr.microsoft.com/windows/servercore:ltsc2019
 # Download the latest self-hosted integration runtime installer into the SHIR folder
 COPY SHIR C:/SHIR/
 
-RUN ["curl", "-L", "https://go.microsoft.com/fwlink/?linkid=839822&clcid=0x409", "-o", "C:/SHIR/IntegrationRuntime.latest.msi"]
-
 RUN ["powershell", "C:/SHIR/build.ps1"]
 
 ENTRYPOINT ["powershell", "C:/SHIR/setup.ps1"]

SHIR/build.ps1

@@ -8,9 +8,22 @@ function Write-Log($Message) {
 function Install-SHIR() {
     Write-Log "Install the Self-hosted Integration Runtime in the Windows container"
 
-    $MsiFileName = (Get-ChildItem -Path C:\SHIR | Where-Object { $_.Name -match [regex] "IntegrationRuntime.*.msi" })[0].Name
-    Write-Log $MsiFileName
+    $MsiFiles = (Get-ChildItem -Path C:\SHIR | Where-Object { $_.Name -match [regex] "IntegrationRuntime.*.msi" })
+    if ($MsiFiles) {
+        $MsiFileName = $MsiFiles[0].Name
+        Write-Log "Using SHIR MSI file: $MsiFileName"
+    }
+    else {
+        Write-Log "Downloading latest version of SHIR MSI file"
+        $MsiFileName = 'IntegrationRuntime.latest.msi'
+
+        # Temporarily disable progress updates to speed up the download process. (See https://stackoverflow.com/questions/69942663/invoke-webrequest-progress-becomes-irresponsive-paused-while-downloading-the-fil)
+        $ProgressPreference = 'SilentlyContinue'
+        Invoke-WebRequest -Uri 'https://go.microsoft.com/fwlink/?linkid=839822&clcid=0x409' -OutFile "C:\SHIR\$MsiFileName"
+        $ProgressPreference = 'Continue'
+    }
 
+    Write-Log "Installing SHIR"
     Start-Process msiexec.exe -Wait -ArgumentList "/i C:\SHIR\$MsiFileName /qn"
     if (!$?) {
         Write-Log "SHIR MSI Install Failed"