func (g *retainer) Retain(log lager.Logger, id layercake.ID) {
g.retainedImagesMu.Lock()
defer g.retainedImagesMu.Unlock()
if g.retainedImages == nil {
g.retainedImages = make(map[string]struct{})
}
g.retainedImages[id.GraphID()] = struct{}{}
}
func (g *retainer) Check(id layercake.ID) bool {
g.retainedImagesMu.Lock()
defer g.retainedImagesMu.Unlock()
if g.retainedImages == nil {
return false
}
_, ok := g.retainedImages[id.GraphID()]
return ok
}
func (a *QuotaedDriver) GetMntPath(id layercake.ID) string {
return a.makeMntPath(id.GraphID())
}
ItCanReadWriteTheLayer := func() {
It("can read and write files", func() {
p, err := cake.Path(id)
Expect(err).NotTo(HaveOccurred())
Expect(ioutil.WriteFile(path.Join(p, "foo"), []byte("hi"), 0700)).To(Succeed())
p, err = cake.Path(id)
Expect(err).NotTo(HaveOccurred())
Expect(path.Join(p, "foo")).To(BeAnExistingFile())
})
It("can get back the image", func() {
img, err := cake.Get(id)
Expect(err).NotTo(HaveOccurred())
Expect(img.ID).To(Equal(id.GraphID()))
Expect(img.Parent).To(Equal(parent.GraphID()))
})
}
Context("when the new layer is a docker image", func() {
JustBeforeEach(func() {
id = layercake.DockerImageID("70d8f0edf5c9008eb61c7c52c458e7e0a831649dbb238b93dde0854faae314a8")
registerImageLayer(cake, &image.Image{
ID: id.GraphID(),
Parent: parent.GraphID(),
})
})
Context("without a parent", func() {
ItCanReadWriteTheLayer()
})
It("should not create the garden-info metadata directories", func() {
Expect(aufsCake.Create(namespacedChildID, parentID, "")).To(Equal(testError))
Expect(filepath.Join(baseDirectory, "garden-info")).NotTo(BeADirectory())
Expect(filepath.Join(baseDirectory, "garden-info", "parent-child")).NotTo(BeADirectory())
Expect(filepath.Join(baseDirectory, "garden-info", "child-parent")).NotTo(BeADirectory())
})
})
})
Describe("Parent-child relationship", func() {
Context("when the namespaced layer is duplicated", func() {
JustBeforeEach(func() {
Expect(aufsCake.Create(namespacedChildID, parentID, "")).To(Succeed())
Expect(aufsCake.Create(namespacedChildID, parentID, "")).To(MatchError(fmt.Sprintf("%s already exists", namespacedChildID.GraphID())))
})
It("does not add duplicated records in child-parent file", func() {
childParentInfo := filepath.Join(baseDirectory, "garden-info", "child-parent", namespacedChildID.GraphID())
Expect(aufsCake.Create(namespacedChildID, parentID, "")).To(HaveOccurred())
childParentInfoData, err := ioutil.ReadFile(childParentInfo)
Expect(err).NotTo(HaveOccurred())
Expect(string(childParentInfoData)).To(Equal(parentID.GraphID() + "\n"))
})
It("does not duplicate the namespaced child id in parent-child file", func() {
parentChildInfo := filepath.Join(baseDirectory, "garden-info", "parent-child", parentID.GraphID())
Expect(parentChildInfo).To(BeAnExistingFile())