Method TestJustStoreObjectsNotAlreadyStored

worktree_commit_test.go:564–620

https://github.com/go-git/go-git/pull/224

(c *C)

// https://github.com/go-git/go-git/pull/224
func (s *WorktreeSuite) TestJustStoreObjectsNotAlreadyStored(c *C) {
	fs := s.TemporalFilesystem(c)

	fsDotgit, err := fs.Chroot(".git") // real fs to get modified timestamps
	c.Assert(err, IsNil)
	storage := filesystem.NewStorage(fsDotgit, cache.NewObjectLRUDefault())

	r, err := Init(storage, fs)
	c.Assert(err, IsNil)

	w, err := r.Worktree()
	c.Assert(err, IsNil)

	// Step 1: Write LICENSE
	util.WriteFile(fs, "LICENSE", []byte("license"), 0644)
	hLicense, err := w.Add("LICENSE")
	c.Assert(err, IsNil)
	c.Assert(hLicense, Equals, plumbing.NewHash("0484eba0d41636ba71fa612c78559cd6c3006cde"))

	hash, err := w.Commit("commit 1\n", &CommitOptions{
		All:    true,
		Author: defaultSignature(),
	})
	c.Assert(err, IsNil)
	c.Assert(hash, Equals, plumbing.NewHash("7a7faee4630d2664a6869677cc8ab614f3fd4a18"))

	infoLicense, err := fsDotgit.Stat(filepath.Join("objects", "04", "84eba0d41636ba71fa612c78559cd6c3006cde"))
	c.Assert(err, IsNil) // checking objects file exists

	// Step 2: Write foo.
	time.Sleep(5 * time.Millisecond) // uncool, but we need to get different timestamps...
	util.WriteFile(fs, "foo", []byte("foo"), 0644)
	hFoo, err := w.Add("foo")
	c.Assert(err, IsNil)
	c.Assert(hFoo, Equals, plumbing.NewHash("19102815663d23f8b75a47e7a01965dcdc96468c"))

	hash, err = w.Commit("commit 2\n", &CommitOptions{
		All:    true,
		Author: defaultSignature(),
	})
	c.Assert(err, IsNil)
	c.Assert(hash, Equals, plumbing.NewHash("97c0c5177e6ac57d10e8ea0017f2d39b91e2b364"))

	// Step 3: Check
	// There is no need to overwrite the object of LICENSE, because its content
	// was not changed. Just a write on the object of foo is required. This behaviour
	// is fixed by #224 and tested by comparing the timestamps of the stored objects.
	infoFoo, err := fsDotgit.Stat(filepath.Join("objects", "19", "102815663d23f8b75a47e7a01965dcdc96468c"))
	c.Assert(err, IsNil)                                                    // checking objects file exists
	c.Assert(infoLicense.ModTime().Before(infoFoo.ModTime()), Equals, true) // object of foo has another/greaterThan timestamp than LICENSE

	infoLicenseSecond, err := fsDotgit.Stat(filepath.Join("objects", "04", "84eba0d41636ba71fa612c78559cd6c3006cde"))
	c.Assert(err, IsNil)

	log.Printf("comparing mod time: %v == %v on %v (%v)", infoLicenseSecond.ModTime(), infoLicense.ModTime(), runtime.GOOS, runtime.GOARCH)
	c.Assert(infoLicenseSecond.ModTime(), Equals, infoLicense.ModTime()) // object of LICENSE should have the same timestamp because no additional write operation was performed
}