[#9] fix: Clean will not remove file unless they're in the working di…

…rectory

build.go

@@ -27,22 +27,25 @@ var (
 // calls os.Exit(); this is to prevent callers from deceptively removing files
 // they shouldn't.
 func Clean(files []string) {
+	workingFS := os.DirFS(WorkingDir())
 	for _, file := range files {
 		if containsBackDir(file) {
 			fmt.Fprintf(os.Stderr, "file %q will not be removed, exiting the build\n", file)
 			exit(1)
 		}
-		fileSystem.Remove(filepath.Join(WorkingDir(), file))
+		openFile, err := workingFS.Open(file)
+		if err == nil {
+			openFile.Close()
+			fileSystem.Remove(filepath.Join(WorkingDir(), file))
+		}
 	}
 }
 
 func containsBackDir(path string) bool {
 	if !strings.Contains(path, "..") {
 		return false
 	}
-	if strings.Contains(path, "\\") {
-		path = strings.ReplaceAll(path, "\\", "/")
-	}
+	path = canonicalizePath(path)
 	if path == ".." {
 		return true
 	}
@@ -53,6 +56,13 @@ func containsBackDir(path string) bool {
 	return containsBackDir(strings.TrimSuffix(dir, "/"))
 }
 
+func canonicalizePath(path string) string {
+	if strings.Contains(path, "\\") {
+		return strings.ReplaceAll(path, "\\", "/")
+	}
+	return path
+}
+
 // Format runs the gofmt tool to repair the formatting of each source file;
 // returns false if the command fails
 func Format(a *goyek.A) bool {
@@ -251,15 +261,12 @@ func allDirs(top string) ([]string, error) {
 	if !topIsDir {
 		return nil, fmt.Errorf("%q is not a directory", top)
 	}
-	if strings.Contains(top, "\\") {
-		top = strings.ReplaceAll(top, "\\", "/")
-	}
+	top = canonicalizePath(top)
 	entries, _ := afero.ReadDir(fileSystem, top)
 	dirs := []string{top}
 	for _, entry := range entries {
 		if entry.IsDir() {
-			subDirectory := filepath.Join(top, entry.Name())
-			subDirs, _ := allDirs(subDirectory)
+			subDirs, _ := allDirs(filepath.Join(top, entry.Name()))
 			dirs = append(dirs, subDirs...)
 		}
 	}

build_test.go

@@ -16,25 +16,25 @@ import (
 )
 
 func TestClean(t *testing.T) {
-	originalFileSystem := fileSystem
+	// note: cannot use memory mapped filesystem; Clean relies on using the os
+	// filesystem to make sure all files are within the working directory
 	originalWorkingDir := workingDir
 	originalExit := exit
+	workingDir = "a/b/c"
 	defer func() {
-		fileSystem = originalFileSystem
 		workingDir = originalWorkingDir
 		exit = originalExit
+		fileSystem.RemoveAll("a")
 	}()
-	fileSystem = afero.NewMemMapFs()
 	fileSystem.MkdirAll("a/b/c", 0o755)
-	workingDir = "a/b/c"
 	afero.WriteFile(fileSystem, "a/b/c/myFile", []byte("foo"), 0o644)
 	afero.WriteFile(fileSystem, "a/b/c/myOtherFile", []byte(""), 0o644)
 	tests := map[string]struct {
 		files          []string
 		wantExitCalled bool
 	}{
 		"no files":     {files: nil},
-		"no problems":  {files: []string{"myFile", "myOtherFile", "myNonExistentFile"}},
+		"no problems":  {files: []string{"myFile", "myOtherFile", "c:\\myNonExistentFile"}},
 		"illegal path": {files: []string{"foo/../../bar"}, wantExitCalled: true},
 	}
 	for name, tt := range tests {
@@ -46,9 +46,7 @@ func TestClean(t *testing.T) {
 			Clean(tt.files)
 			for _, file := range tt.files {
 				f := filepath.Join(workingDir, file)
-				if fileExists, err := afero.Exists(fileSystem, f); err != nil {
-					t.Errorf("Clean: something went wrong verifying the non-existence of %q: %v", f, err)
-				} else if fileExists {
+				if fileExists, _ := afero.Exists(fileSystem, f); fileExists {
 					t.Errorf("Clean failed to delete %q", f)
 				}
 			}