v5: Ensure Chmod behaviour across BoundOS and ChrootOS

.github/workflows/test.yml

@@ -5,7 +5,7 @@ jobs:
   test:
     strategy:
       matrix:
-        go-version: [1.21.x,1.22.x,1.23.x]
+        go-version: [1.24.x, oldstable, stable]
         platform: [ubuntu-latest, macos-latest, windows-latest]
     runs-on: ${{ matrix.platform }}
     steps:

helper/polyfill/polyfill.go

@@ -13,7 +13,7 @@ type Polyfill struct {
 	c capabilities
 }
 
-type capabilities struct{ tempfile, dir, symlink, chroot bool }
+type capabilities struct{ tempfile, dir, symlink, chroot, chmod bool }
 
 // New creates a new filesystem wrapping up 'fs' the intercepts all the calls
 // made and errors if fs doesn't implement any of the billy interfaces.
@@ -28,6 +28,7 @@ func New(fs billy.Basic) billy.Filesystem {
 	_, h.c.dir = h.Basic.(billy.Dir)
 	_, h.c.symlink = h.Basic.(billy.Symlink)
 	_, h.c.chroot = h.Basic.(billy.Chroot)
+	_, h.c.chmod = h.Basic.(billy.Chmod)
 	return h
 }
 
@@ -87,6 +88,14 @@ func (h *Polyfill) Chroot(path string) (billy.Filesystem, error) {
 	return h.Basic.(billy.Chroot).Chroot(path)
 }
 
+func (h *Polyfill) Chmod(path string, mode os.FileMode) error {
+	if !h.c.chmod {
+		return billy.ErrNotSupported
+	}
+
+	return h.Basic.(billy.Chmod).Chmod(path, mode)
+}
+
 func (h *Polyfill) Root() string {
 	if !h.c.chroot {
 		return string(filepath.Separator)

helper/polyfill/polyfill_test.go

@@ -58,6 +58,14 @@ func (s *PolyfillSuite) TestChroot(c *C) {
 	c.Assert(err, Equals, billy.ErrNotSupported)
 }
 
+func (s *PolyfillSuite) TestChmod(c *C) {
+	ch, ok := s.Helper.(billy.Chmod)
+	c.Assert(ok, Equals, true)
+
+	err := ch.Chmod("", 0o444)
+	c.Assert(err, Equals, billy.ErrNotSupported)
+}
+
 func (s *PolyfillSuite) TestRoot(c *C) {
 	c.Assert(s.Helper.Root(), Equals, string(filepath.Separator))
 }

osfs/os_bound.go

@@ -126,6 +126,14 @@ func (fs *BoundOS) TempFile(dir, prefix string) (billy.File, error) {
 		if err != nil {
 			return nil, err
 		}
+
+		_, err = os.Stat(dir)
+		if err != nil && os.IsNotExist(err) {
+			err = os.MkdirAll(dir, defaultDirectoryMode)
+			if err != nil {
+				return nil, err
+			}
+		}
 	}
 
 	return tempFile(dir, prefix)

osfs/os_bound_test.go

@@ -247,9 +247,10 @@ func TestTempFile(t *testing.T) {
 	g.Expect(f.Close()).ToNot(gomega.HaveOccurred())
 
 	f, err = fs.TempFile("/above/cwd", "prefix")
-	g.Expect(err).To(gomega.HaveOccurred())
-	g.Expect(err.Error()).To(gomega.ContainSubstring(fmt.Sprint(dir, filepath.FromSlash("/above/cwd/prefix"))))
-	g.Expect(f).To(gomega.BeNil())
+	g.Expect(err).ToNot(gomega.HaveOccurred())
+	g.Expect(f).ToNot(gomega.BeNil())
+	g.Expect(f.Name()).To(gomega.HavePrefix(filepath.Join(dir, "/above/cwd", "prefix")))
+	g.Expect(f.Close()).ToNot(gomega.HaveOccurred())
 
 	tempDir := os.TempDir()
 	// For windows, volume name must be removed.
@@ -258,9 +259,10 @@ func TestTempFile(t *testing.T) {
 	}
 
 	f, err = fs.TempFile(tempDir, "prefix")
-	g.Expect(err).To(gomega.HaveOccurred())
-	g.Expect(err.Error()).To(gomega.ContainSubstring(filepath.Join(dir, tempDir, "prefix")))
-	g.Expect(f).To(gomega.BeNil())
+	g.Expect(err).ToNot(gomega.HaveOccurred())
+	g.Expect(f).ToNot(gomega.BeNil())
+	g.Expect(f.Name()).To(gomega.HavePrefix(filepath.Join(dir, tempDir, "prefix")))
+	g.Expect(f.Close()).ToNot(gomega.HaveOccurred())
 }
 
 func TestChroot(t *testing.T) {
@@ -1105,10 +1107,10 @@ func TestReadDir(t *testing.T) {
 	g.Expect(dirs).To(gomega.BeNil())
 }
 
-func TestInsideBaseDirEval(t*testing.T) {
+func TestInsideBaseDirEval(t *testing.T) {
 	g := gomega.NewWithT(t)
 	fs := BoundOS{baseDir: "/"}
-	b, err :=  fs.insideBaseDirEval("a")
+	b, err := fs.insideBaseDirEval("a")
 	g.Expect(b).To(gomega.BeTrue())
 	g.Expect(err).To(gomega.BeNil())
 }