Example #1
0
// Open opens a given snap file with the right backend
func Open(path string) (Container, error) {

	// see if it's a snapdir first
	if osutil.FileExists(filepath.Join(path, "meta", "snap.yaml")) {
		return snapdir.New(path), nil
	}

	// open the file and check magic
	f, err := os.Open(path)
	if err != nil {
		return nil, fmt.Errorf("cannot open snap: %v", err)
	}
	defer f.Close()

	header := make([]byte, 20)
	if _, err := f.ReadAt(header, 0); err != nil {
		return nil, fmt.Errorf("cannot read snap: %v", err)
	}

	for _, h := range formatHandlers {
		if bytes.HasPrefix(header, h.magic) {
			return h.open(path)
		}
	}

	return nil, fmt.Errorf("cannot open snap: unknown header: %q", header)
}
Example #2
0
func (s *SnapdirTestSuite) TestReadFile(c *C) {
	d := c.MkDir()
	needle := []byte(`stuff`)
	err := ioutil.WriteFile(filepath.Join(d, "foo"), needle, 0644)
	c.Assert(err, IsNil)

	snap := snapdir.New(d)
	content, err := snap.ReadFile("foo")
	c.Assert(err, IsNil)
	c.Assert(content, DeepEquals, needle)
}
Example #3
0
func (s *SnapdirTestSuite) TestInstall(c *C) {
	tryBaseDir := c.MkDir()
	snap := snapdir.New(tryBaseDir)

	varLibSnapd := c.MkDir()
	targetPath := filepath.Join(varLibSnapd, "foo_1.0.snap")
	err := snap.Install(targetPath, "unused-mount-dir")
	c.Assert(err, IsNil)
	symlinkTarget, err := filepath.EvalSymlinks(targetPath)
	c.Assert(err, IsNil)
	c.Assert(symlinkTarget, Equals, tryBaseDir)
}
Example #4
0
func (s *SnapdirTestSuite) TestListDir(c *C) {
	d := c.MkDir()

	err := os.MkdirAll(filepath.Join(d, "test"), 0755)
	c.Assert(err, IsNil)
	err = ioutil.WriteFile(filepath.Join(d, "test", "test1"), nil, 0644)
	c.Assert(err, IsNil)
	err = ioutil.WriteFile(filepath.Join(d, "test", "test2"), nil, 0644)
	c.Assert(err, IsNil)

	snap := snapdir.New(d)
	fileNames, err := snap.ListDir("test")
	c.Assert(err, IsNil)
	c.Assert(fileNames, HasLen, 2)
	c.Check(fileNames[0], Equals, "test1")
	c.Check(fileNames[1], Equals, "test2")
}