Remove dummy mod dir (#1121)

azure-pipelines.yml

@@ -7,7 +7,7 @@ pool:
   vmImage: 'vs2017-win2016'
 
 variables:
-  GOBIN:  '$(GOPATH)\bin' # Go binaries path
+  GOBIN:  'C:\Go\bin' # Go binaries path
   GOPATH: '$(system.defaultWorkingDirectory)\gopath' # Go workspace path
   GO111MODULE: 'on'
   modulePath: '$(GOPATH)\src\github.com\$(build.repository.name)' # Path to the module's code
@@ -15,7 +15,6 @@ variables:
 steps:
 - powershell: |
     choco upgrade golang
-    mkdir "$env:GOBIN" | out-null
     mkdir "$env:GOPATH\pkg" | out-null
     mkdir "$env:modulePath" | out-null
     robocopy "$env:system_defaultWorkingDirectory\" "$env:modulePath\" /E /Z /ZB /R:5 /W:5 /TBD /NP /V /XD "$env:GOPATH"
@@ -23,6 +22,6 @@ steps:
   displayName: 'set up the Go workspace'
 
 - powershell: |
-    go test -mod=vendor -race ./...
+    & "C:\\Go\\bin\\go.exe" test -mod=vendor -race ./...
   workingDirectory: '$(modulePath)'
   displayName: 'run tests'

pkg/download/upstream_lister.go

@@ -39,22 +39,18 @@ func (l *vcsLister) List(ctx context.Context, mod string) (*storage.RevInfo, []s
 	ctx, span := observ.StartSpan(ctx, op.String())
 	defer span.End()
 
-	hackyPath, err := afero.TempDir(l.fs, "", "hackymod")
-	if err != nil {
-		return nil, nil, errors.E(op, err)
-	}
-	defer l.fs.RemoveAll(hackyPath)
-	err = module.Dummy(l.fs, hackyPath)
+	tmpDir, err := afero.TempDir(l.fs, "", "go-list")
 	if err != nil {
 		return nil, nil, errors.E(op, err)
 	}
+	defer l.fs.RemoveAll(tmpDir)
 
 	cmd := exec.Command(
 		l.goBinPath,
 		"list", "-m", "-versions", "-json",
 		config.FmtModVer(mod, "latest"),
 	)
-	cmd.Dir = hackyPath
+	cmd.Dir = tmpDir
 	stdout := &bytes.Buffer{}
 	stderr := &bytes.Buffer{}
 	cmd.Stdout = stdout

pkg/module/go_get_fetcher.go

@@ -65,12 +65,6 @@ func (g *goGetFetcher) Fetch(ctx context.Context, mod, ver string) (*storage.Ver
 		return nil, errors.E(op, err)
 	}
 
-	// setup the module with barebones stuff
-	if err := Dummy(g.fs, modPath); err != nil {
-		ClearFiles(g.fs, goPathRoot)
-		return nil, errors.E(op, err)
-	}
-
 	m, err := downloadModule(g.goBinaryName, g.fs, goPathRoot, modPath, mod, ver)
 	if err != nil {
 		ClearFiles(g.fs, goPathRoot)
@@ -104,23 +98,6 @@ func (g *goGetFetcher) Fetch(ctx context.Context, mod, ver string) (*storage.Ver
 	return &storageVer, nil
 }
 
-// Dummy Hacky thing makes vgo not to complain
-func Dummy(fs afero.Fs, repoRoot string) error {
-	const op errors.Op = "module.Dummy"
-	// vgo expects go.mod file present with module statement or .go file with import comment
-	gomodPath := filepath.Join(repoRoot, "go.mod")
-	gomodContent := []byte("module mod")
-	if err := afero.WriteFile(fs, gomodPath, gomodContent, 0666); err != nil {
-		return errors.E(op, err)
-	}
-	sourcePath := filepath.Join(repoRoot, "mod.go")
-	sourceContent := []byte("package mod")
-	if err := afero.WriteFile(fs, sourcePath, sourceContent, 0666); err != nil {
-		return errors.E(op, err)
-	}
-	return nil
-}
-
 // given a filesystem, gopath, repository root, module and version, runs 'go mod download -json'
 // on module@version from the repoRoot with GOPATH=gopath, and returns a non-nil error if anything went wrong.
 func downloadModule(goBinaryName string, fs afero.Fs, gopath, repoRoot, module, version string) (goModule, error) {