extension: customize build for tools

This change allows one to specify build settings used to install tools.

E.g. the one may specify "GOAMD64=v3" for tools (in order to match current
machine specs) but proceed with defaults (i.e. "GOAMD64=v1")
for builds/tests globally.

Author: rockdrilla

docs/settings.md

@@ -483,6 +483,22 @@ Default: `"proxy"`
 The path to the `go` binary used to install the Go tools. If it's empty, the same `go` binary chosen for the project will be used for tool installation.
 
 Default: `""`
+
+### `go.toolsManagement.buildFlags`
+
+Flags to `go install` used to install the Go tools. (e.g. `["-ldflags", "-s -w"]`)
+
+Default: `[]`
+### `go.toolsManagement.buildTags`
+
+The Go build tags used to install the Go tools.
+
+Default: `""`
+### `go.toolsManagement.envVars`
+
+Environment variables that will be used to install the Go tools.
+
+Default: `{}`
 ### `go.trace.server`
 
 Trace the communication between VS Code and the Go language server.<br/>

extension/package.json

@@ -114,6 +114,9 @@
         "go.inferGopath",
         "go.toolsGopath",
         "go.toolsEnvVars",
+        "go.toolsManagement.buildFlags",
+        "go.toolsManagement.buildTags",
+        "go.toolsManagement.envVars",
         "go.toolsManagement.go"
       ]
     }
@@ -1544,6 +1547,27 @@
           "description": "Automatically update the tools used by the extension, without prompting the user.",
           "scope": "resource"
         },
+        "go.toolsManagement.buildFlags": {
+          "type": "array",
+          "items": {
+            "type": "string"
+          },
+          "default": [],
+          "description": "Flags to `go install` used to install the Go tools. (e.g. [\"-ldflags\", \"-s -w\"])",
+          "scope": "machine-overridable"
+        },
+        "go.toolsManagement.buildTags": {
+          "type": "string",
+          "default": "",
+          "description": "The Go build tags used to install the Go tools.",
+          "scope": "machine-overridable"
+        },
+        "go.toolsManagement.envVars": {
+          "type": "object",
+          "default": {},
+          "description": "Environment variables that will be used to install the Go tools.",
+          "scope": "machine-overridable"
+        },
         "go.enableCodeLens": {
           "type": "object",
           "properties": {

extension/src/goInstallTools.ts

@@ -263,7 +263,8 @@ async function installToolWithGo(
 		}
 	}
 
-	const env = Object.assign({}, envForTools);
+	const toolsBuildEnv = getGoConfig().get('toolsManagement.envVars') ?? {};
+	const env = Object.assign({}, envForTools, toolsBuildEnv);
 
 	let version: semver.SemVer | string | undefined | null = tool.version;
 	if (!version && tool.usePrereleaseInPreviewMode && extensionInfo.isPreview) {
@@ -291,9 +292,21 @@ async function installToolWithGoInstall(goVersion: GoVersion, env: NodeJS.Dict<s
 		cwd: getWorkspaceFolderPath()
 	};
 
+	const goConfig = getGoConfig();
+	const buildFlags: string[] = goConfig.get('toolsManagement.buildFlags') ?? [];
+	const buildTags: string = goConfig.get('toolsManagement.buildTags') ?? "";
+
+	const buildArgs: string[] = ['install', '-v'];
+	buildArgs.push(...buildFlags);
+	if (buildTags.length > 0 && buildFlags.indexOf('-tags') === -1) {
+		buildArgs.push('-tags');
+		buildArgs.push(buildTags);
+	}
+	buildArgs.push(importPath);
+
 	const execFile = util.promisify(cp.execFile);
 	outputChannel.trace(`$ ${goBinary} install -v ${importPath}} (cwd: ${opts.cwd})`);
-	await execFile(goBinary, ['install', '-v', importPath], opts);
+	await execFile(goBinary, buildArgs, opts);
 }
 
 export function declinedToolInstall(toolName: string) {