Add MacPorts support to the build system (#10736)

.spelling

@@ -6,6 +6,7 @@
 0-powershell-crossplatform
 0xfeeddeadbeef
 100ms
+2.x
 2ae5d07
 32-bit
 64-bit
@@ -379,6 +380,7 @@ lynda.com
 lzybkr
 mababio
 macos
+macports
 maertendmsft
 mahawar
 markekraus

build.psm1

@@ -123,6 +123,15 @@ function Get-EnvironmentInformation
         $environment += @{'nugetPackagesRoot' = "${env:HOME}/.nuget/packages"}
     }
 
+    if ($Environment.IsMacOS) {
+        $environment += @{'UsingHomebrew' = [bool](Get-Command brew -ErrorAction ignore)}
+        $environment += @{'UsingMacports' = [bool](Get-Command port -ErrorAction ignore)}
+
+        if (-not($environment.UsingHomebrew -or $environment.UsingMacports)) {
+            throw "Neither Homebrew nor MacPorts is installed on this system, visit https://brew.sh/ or https://www.macports.org/ to continue"
+        }
+    }
+
     if ($Environment.IsLinux) {
         $LinuxInfo = Get-Content /etc/os-release -Raw | ConvertFrom-StringData
 
@@ -1710,7 +1719,11 @@ function Start-PSBootstrap {
                     Invoke-Expression "$baseCommand $Deps"
                 }
             } elseif ($Environment.IsMacOS) {
-                precheck 'brew' "Bootstrap dependency 'brew' not found, must install Homebrew! See https://brew.sh/"
+                if ($Environment.UsingHomebrew) {
+                    $PackageManager = "brew"
+                } elseif ($Environment.UsingMacports) {
+                    $PackageManager = "$sudo port"
+                }
 
                 # Build tools
                 $Deps += "cmake"
@@ -1720,7 +1733,7 @@ function Start-PSBootstrap {
 
                 # Install dependencies
                 # ignore exitcode, because they may be already installed
-                Start-NativeExecution { brew install $Deps } -IgnoreExitcode
+                Start-NativeExecution ([ScriptBlock]::Create("$PackageManager install $Deps")) -IgnoreExitcode
             } elseif ($Environment.IsAlpine) {
                 $Deps += 'libunwind', 'libcurl', 'bash', 'cmake', 'clang', 'build-base', 'git', 'curl'
 

docs/building/macos.md

@@ -7,14 +7,14 @@ building on macOS is almost identical.
 
 ## Environment
 
-You will want [Homebrew](https://brew.sh/), the missing package manager for macOS.
+You will want [Homebrew](https://brew.sh/) or [MacPorts](https://www.macports.org/), the missing package manager for macOS.
 Once installed, follow the same instructions to download and
 install a self-hosted copy of PowerShell on your macOS machine.
 From `pwsh.exe`, run `Import-Module ./build.psm1` and use `Start-PSBootstrap` to install the dependencies.
 
 The `Start-PSBootstrap` function does the following:
 
-- Uses `brew` to install CMake, OpenSSL, and GNU WGet
+- Uses `brew` or `port` to install CMake, OpenSSL, and GNU WGet
 - Uninstalls any prior versions of .NET CLI
 - Downloads and installs .NET Core SDK to `~/.dotnet`