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Merge pull request #35 from mcuadros/polyfill
helper: new polyfill helper, and mount and chroot simplification
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,100 @@ | ||
| package polyfill | ||
|
|
||
| import ( | ||
| "os" | ||
| "path/filepath" | ||
|
|
||
| "gopkg.in/src-d/go-billy.v3" | ||
| ) | ||
|
|
||
| // Polyfill is a helper that implements all missing method from billy.Filesystem. | ||
| type Polyfill struct { | ||
| billy.Basic | ||
| c capabilities | ||
| } | ||
|
|
||
| type capabilities struct{ tempfile, dir, symlink, chroot 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. | ||
| func New(fs billy.Basic) billy.Filesystem { | ||
| if original, ok := fs.(billy.Filesystem); ok { | ||
| return original | ||
| } | ||
|
|
||
| h := &Polyfill{Basic: fs} | ||
|
|
||
| _, h.c.tempfile = h.Basic.(billy.TempFile) | ||
| _, h.c.dir = h.Basic.(billy.Dir) | ||
| _, h.c.symlink = h.Basic.(billy.Symlink) | ||
| _, h.c.chroot = h.Basic.(billy.Chroot) | ||
| return h | ||
| } | ||
|
|
||
| func (h *Polyfill) TempFile(dir, prefix string) (billy.File, error) { | ||
| if !h.c.tempfile { | ||
| return nil, billy.ErrNotSupported | ||
| } | ||
|
|
||
| return h.Basic.(billy.TempFile).TempFile(dir, prefix) | ||
| } | ||
|
|
||
| func (h *Polyfill) ReadDir(path string) ([]os.FileInfo, error) { | ||
| if !h.c.dir { | ||
| return nil, billy.ErrNotSupported | ||
| } | ||
|
|
||
| return h.Basic.(billy.Dir).ReadDir(path) | ||
| } | ||
|
|
||
| func (h *Polyfill) MkdirAll(filename string, perm os.FileMode) error { | ||
| if !h.c.dir { | ||
| return billy.ErrNotSupported | ||
| } | ||
|
|
||
| return h.Basic.(billy.Dir).MkdirAll(filename, perm) | ||
| } | ||
|
|
||
| func (h *Polyfill) Symlink(target, link string) error { | ||
| if !h.c.symlink { | ||
| return billy.ErrNotSupported | ||
| } | ||
|
|
||
| return h.Basic.(billy.Symlink).Symlink(target, link) | ||
| } | ||
|
|
||
| func (h *Polyfill) Readlink(link string) (string, error) { | ||
| if !h.c.symlink { | ||
| return "", billy.ErrNotSupported | ||
| } | ||
|
|
||
| return h.Basic.(billy.Symlink).Readlink(link) | ||
| } | ||
|
|
||
| func (h *Polyfill) Lstat(path string) (os.FileInfo, error) { | ||
| if !h.c.symlink { | ||
| return nil, billy.ErrNotSupported | ||
| } | ||
|
|
||
| return h.Basic.(billy.Symlink).Lstat(path) | ||
| } | ||
|
|
||
| func (h *Polyfill) Chroot(path string) (billy.Filesystem, error) { | ||
| if !h.c.chroot { | ||
| return nil, billy.ErrNotSupported | ||
| } | ||
|
|
||
| return h.Basic.(billy.Chroot).Chroot(path) | ||
| } | ||
|
|
||
| func (h *Polyfill) Root() string { | ||
| if !h.c.chroot { | ||
| return string(filepath.Separator) | ||
| } | ||
|
|
||
| return h.Basic.(billy.Chroot).Root() | ||
| } | ||
|
|
||
| func (h *Polyfill) Underlying() billy.Basic { | ||
| return h.Basic | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,63 @@ | ||
| package polyfill | ||
|
|
||
| import ( | ||
| "path/filepath" | ||
| "testing" | ||
|
|
||
| "gopkg.in/src-d/go-billy.v3" | ||
| "gopkg.in/src-d/go-billy.v3/test" | ||
|
|
||
| . "gopkg.in/check.v1" | ||
| ) | ||
|
|
||
| func Test(t *testing.T) { TestingT(t) } | ||
|
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||
| var _ = Suite(&PolyfillSuite{}) | ||
|
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||
| type PolyfillSuite struct { | ||
| Helper billy.Filesystem | ||
| Underlying billy.Filesystem | ||
| } | ||
|
|
||
| func (s *PolyfillSuite) SetUpTest(c *C) { | ||
| s.Helper = New(&test.BasicMock{}) | ||
| } | ||
|
|
||
| func (s *PolyfillSuite) TestTempFile(c *C) { | ||
| _, err := s.Helper.TempFile("", "") | ||
| c.Assert(err, Equals, billy.ErrNotSupported) | ||
| } | ||
|
|
||
| func (s *PolyfillSuite) TestReadDir(c *C) { | ||
| _, err := s.Helper.ReadDir("") | ||
| c.Assert(err, Equals, billy.ErrNotSupported) | ||
| } | ||
|
|
||
| func (s *PolyfillSuite) TestMkdirAll(c *C) { | ||
| err := s.Helper.MkdirAll("", 0) | ||
| c.Assert(err, Equals, billy.ErrNotSupported) | ||
| } | ||
|
|
||
| func (s *PolyfillSuite) TestSymlink(c *C) { | ||
| err := s.Helper.Symlink("", "") | ||
| c.Assert(err, Equals, billy.ErrNotSupported) | ||
| } | ||
|
|
||
| func (s *PolyfillSuite) TestReadlink(c *C) { | ||
| _, err := s.Helper.Readlink("") | ||
| c.Assert(err, Equals, billy.ErrNotSupported) | ||
| } | ||
|
|
||
| func (s *PolyfillSuite) TestLstat(c *C) { | ||
| _, err := s.Helper.Lstat("") | ||
| c.Assert(err, Equals, billy.ErrNotSupported) | ||
| } | ||
|
|
||
| func (s *PolyfillSuite) TestChroot(c *C) { | ||
| _, err := s.Helper.Chroot("") | ||
| c.Assert(err, Equals, billy.ErrNotSupported) | ||
| } | ||
|
|
||
| func (s *PolyfillSuite) TestRoot(c *C) { | ||
| c.Assert(s.Helper.Root(), Equals, string(filepath.Separator)) | ||
| } |