Add more locations to find func (#682)

docs/recipes/azure_functions.md

@@ -11,11 +11,7 @@ To start, create an Azure Function project in a folder called `backend-function`
 - [Visual Studio](https://docs.microsoft.com/en-us/azure/azure-functions/functions-create-your-first-function-visual-studio)
 - [Commandline](https://docs.microsoft.com/en-us/azure/azure-functions/functions-create-first-azure-function-azure-cli?tabs=bash%2Cbrowser&pivots=programming-language-csharp)
 
-Next, you must have the [Azure Functions Core Tools](https://docs.microsoft.com/en-us/azure/azure-functions/functions-run-local?tabs=windows%2Ccsharp%2Cbash) through npm. By default, if you created an azure function through VSCode or Commandline, you will already have installed it. Otherwise, you can install the core tools by running:
-
-```bash
-npm install -g azure-functions-core-tools@3
-```
+Next, you must have the [Azure Functions Core Tools](https://docs.microsoft.com/en-us/azure/azure-functions/functions-run-local?tabs=windows%2Ccsharp%2Cbash). You can install the core tools by installing the [standalone installer](https://docs.microsoft.com/en-us/azure/azure-functions/functions-run-local?tabs=windows%2Ccsharp%2Cbash#v2) or through [npm](https://www.npmjs.com/package/azure-functions-core-tools).
 
 You can also specify a path to func by specifying `pathToFunc` for the azure function service.
 

docs/reference/schema.md

@@ -226,7 +226,7 @@ A path to a folder which contains an azure function project.
 
 #### `pathToFunc` (string)
 
-An optional path to the Azure Functions host to be used instead of the default one installed by npm.
+An optional path to the Azure Functions host to be used.
 
 ## Environment Variables
 

src/Microsoft.Tye.Hosting/FuncFinder.cs

@@ -5,6 +5,7 @@
 using System;
 using System.Collections.Generic;
 using System.IO;
+using System.Linq;
 using System.Runtime.InteropServices;
 using System.Threading.Tasks;
 using Microsoft.Extensions.Logging;
@@ -49,25 +50,50 @@ namespace Microsoft.Tye.Hosting
 
         private string? FindFuncForVersion(AzureFunctionRunInfo func)
         {
-            var npmFuncDllPath = GetFuncNpmPath();
-            if (!File.Exists(npmFuncDllPath))
+            var funcDllPath = FuncDllPath();
+            if (!File.Exists(funcDllPath))
             {
-                throw new FileNotFoundException("Could not find func installation. Please install the azure function core tools via: `npm install -g azure-functions-core-tools@3`");
+                throw new FileNotFoundException("Could not find func installation. Please install the azure function core tools with the installer: " +
+                    "https://docs.microsoft.com/en-us/azure/azure-functions/functions-run-local or `npm install -g azure-functions-core-tools@3`");
             }
 
-            _logger.LogDebug("Using func for running azure functions located at {Func}.", npmFuncDllPath);
-            return npmFuncDllPath;
+            _logger.LogDebug("Using func for running azure functions located at {Func}.", funcDllPath);
+            return funcDllPath;
         }
 
-        private string GetFuncNpmPath()
+        private string FuncDllPath()
         {
             if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
             {
+                var funcPathStandalone = Environment.ExpandEnvironmentVariables("%PROGRAMFILES%/Microsoft/Azure Functions Core Tools/func.dll");
+                if (File.Exists(funcPathStandalone))
+                {
+                    return funcPathStandalone;
+                }
+
                 return Environment.ExpandEnvironmentVariables("%APPDATA%/npm/node_modules/azure-functions-core-tools/bin/func.dll");
             }
+            else if (RuntimeInformation.IsOSPlatform(OSPlatform.Linux))
+            {
+                var funcPathStandalone = "/usr/lib/azure-functions-core-tools-3/func.dll";
+                if (File.Exists(funcPathStandalone))
+                {
+                    return funcPathStandalone;
+                }
+
+                return "/usr/local/lib/node_modules/azure-functions-core-tools/bin/func.dll";
+            }
             else
             {
-                return Environment.ExpandEnvironmentVariables("/usr/local/lib/node_modules/azure-functions-core-tools/bin/func.dll");
+                // For brew path, just find a folder that supports functions v3.
+                var funcDirectories = Directory.GetDirectories("/usr/local/Cellar/azure-functions-core-tools@3/");
+                var funcPathStandalone = Path.Combine(funcDirectories.LastOrDefault() ?? "", "func.dll");
+                if (File.Exists(funcPathStandalone))
+                {
+                    return funcPathStandalone;
+                }
+
+                return "/usr/local/lib/node_modules/azure-functions-core-tools/bin/func.dll";
             }
         }