Set up vcpkg cache variables in eng/common

Author: danieljurek

eng/common/pipelines/templates/steps/set-vcpkg-cache-vars.yml

@@ -0,0 +1,19 @@
+steps:
+  - pwsh: |
+      Write-Host "Setting vcpkg cache variables for read only access to vcpkg binary and asset caches"
+      Write-Host '##vso[task.setvariable variable=VCPKG_BINARY_SOURCES_SECRET;issecret=true;]clear;x-azcopy,https://azuresdkartifacts.blob.core.windows.net/public-vcpkg-container,read'
+      Write-Host '##vso[task.setvariable variable=X_VCPKG_ASSET_SOURCES_SECRET;issecret=true;]clear;x-azurl,https://azuresdkartifacts.blob.core.windows.net/public-vcpkg-container,,read'
+    displayName: Set vcpkg variables
+
+  - ${{if eq(variables['System.TeamProject'], 'internal') }}:
+    - task: AzurePowerShell@5
+      displayName: Set Vcpkg Write-mode Cache
+      inputs:
+        azureSubscription: 'Azure SDK Artifacts'
+        ScriptType: FilePath
+        ScriptPath: eng/common/scripts/Set-VcpkgWriteModeCache.ps1
+        azurePowerShellVersion: LatestVersion
+        pwsh: true
+      # This step is idempotent and can be run multiple times in cases of
+      # failure and partial execution.
+      retryCountOnTaskFailure: 3

eng/common/scripts/Set-VcpkgWriteModeCache.ps1

@@ -0,0 +1,46 @@
+#!/bin/env pwsh
+param(
+  [string] $StorageAccountName = 'azuresdkartifacts',
+  [string] $StorageContainerName = 'public-vcpkg-container'
+)
+
+. "$PSScriptRoot/../common/scripts/Helpers/PSModule-Helpers.ps1"
+
+Write-Host "`$env:PSModulePath = $($env:PSModulePath)"
+
+# Work around double backslash
+if ($IsWindows) {
+  $hostedAgentModulePath = $env:SystemDrive + "\\Modules"
+  $moduleSeperator = ";"
+}
+else {
+  $hostedAgentModulePath = "/usr/share"
+  $moduleSeperator = ":"
+}
+$modulePaths = $env:PSModulePath -split $moduleSeperator
+$modulePaths = $modulePaths.Where({ !$_.StartsWith($hostedAgentModulePath) })
+$AzModuleCachePath = (Get-ChildItem "$hostedAgentModulePath/az_*" -Attributes Directory) -join $moduleSeperator
+if ($AzModuleCachePath -and $env.PSModulePath -notcontains $AzModuleCachePath) {
+  $modulePaths += $AzModuleCachePath
+}
+
+$env:PSModulePath = $modulePaths -join $moduleSeperator
+
+Install-ModuleIfNotInstalled "Az.Storage" "4.3.0" | Import-Module
+
+$ctx = New-AzStorageContext `
+  -StorageAccountName $StorageAccountName `
+  -UseConnectedAccount
+
+$vcpkgBinarySourceSas = New-AzStorageContainerSASToken `
+  -Name $StorageContainerName `
+  -Permission "rwcl" `
+  -Context $ctx `
+  -ExpiryTime (Get-Date).AddHours(1)
+
+Write-Host "Ensure redaction of SAS tokens in logs"
+Write-Host "##vso[task.setvariable variable=VCPKG_BINARY_SAS_TOKEN;issecret=true;]$vcpkgBinarySourceSas"
+
+Write-Host "Setting vcpkg binary cache to read and write"
+Write-Host "##vso[task.setvariable variable=VCPKG_BINARY_SOURCES_SECRET;issecret=true;]clear;x-azcopy-sas,https://$StorageAccountName.blob.core.windows.net/$StorageContainerName,$vcpkgBinarySourceSas,readwrite"
+Write-Host "##vso[task.setvariable variable=X_VCPKG_ASSET_SOURCES_SECRET;issecret=true;]clear;x-azurl,https://$StorageAccountName.blob.core.windows.net/$StorageContainerName,$vcpkgBinarySourceSas,readwrite"