Set GOPATH to the default directory if unset

lib/installer.js

@@ -113,16 +113,28 @@ function getDownloadUrl(filename) {
 }
 function setGoEnvironmentVariables(goRoot) {
     core.exportVariable('GOROOT', goRoot);
-    const goPath = process.env['GOPATH'] || '';
+    const goPath = getGoPath();
     const goBin = process.env['GOBIN'] || '';
-    // set GOPATH and GOBIN as user value
+    // set GOPATH and GOBIN if defined
     if (goPath) {
         core.exportVariable('GOPATH', goPath);
+        core.addPath(path.join(goPath, 'bin'));
     }
     if (goBin) {
         core.exportVariable('GOBIN', goBin);
     }
 }
+// Get GOPATH as user value or as defined by https://golang.org/doc/code.html#GOPATH
+function getGoPath() {
+    const home = process.env['HOME'] || '';
+    const goPath = process.env['GOPATH'] || '';
+    if (goPath) {
+        return goPath;
+    } else if (home) {
+        return path.join(home, 'go');
+    }
+    return '';
+}
 // This function is required to convert the version 1.10 to 1.10.0.
 // Because caching utility accept only sementic version,
 // which have patch number as well.

src/installer.ts

@@ -109,18 +109,33 @@ function getDownloadUrl(filename: string): string {
 function setGoEnvironmentVariables(goRoot: string) {
   core.exportVariable('GOROOT', goRoot);
 
-  const goPath: string = process.env['GOPATH'] || '';
-  const goBin: string = process.env['GOBIN'] || '';
+  const goPath = getGoPath();
+  const goBin = process.env['GOBIN'] || '';
 
   // set GOPATH and GOBIN as user value
   if (goPath) {
     core.exportVariable('GOPATH', goPath);
+    core.addPath(path.join(goPath, 'bin'));
   }
   if (goBin) {
     core.exportVariable('GOBIN', goBin);
   }
 }
 
+// Get GOPATH as user value or as defined by https://golang.org/doc/code.html#GOPATH
+function getGoPath(): string {
+  const home: string = process.env['HOME'] || '';
+  const goPath: string = process.env['GOPATH'] || '';
+
+  if (goPath) {
+    return goPath;
+  } else if (home) {
+    return path.join(home, 'go');
+  }
+
+  return '';
+}
+
 // This function is required to convert the version 1.10 to 1.10.0.
 // Because caching utility accept only sementic version,
 // which have patch number as well.