Context("when the threshold is exceeded", func() {
BeforeEach(func() {
fakeThreshold.ExceededReturns(true)
})
Describe("GC", func() {
Context("when there is a single leaf", func() {
BeforeEach(func() {
fakeCake.GetAllLeavesReturns([]layercake.ID{layercake.DockerImageID("child")}, nil)
size[layercake.DockerImageID("child2")] = 2048
})
It("should not remove it when it is used by a container", func() {
fakeCake.GetReturns(&image.Image{Container: "used-by-me"}, nil)
Expect(gc.GC(logger, fakeCake)).To(Succeed())
Expect(fakeCake.RemoveCallCount()).To(Equal(0))
})
Context("when the layer has no parents", func() {
BeforeEach(func() {
fakeCake.GetReturns(&image.Image{}, nil)
})
It("removes the layer", func() {
Expect(gc.GC(logger, fakeCake)).To(Succeed())
Expect(fakeCake.RemoveCallCount()).To(Equal(1))
Expect(fakeCake.RemoveArgsForCall(0)).To(Equal(layercake.DockerImageID("child")))
})
Context("when the layer is retained", func() {
JustBeforeEach(func() {
Expect(err).To(BeNil())
Expect(img).To(Equal(testImage))
})
})
})
Describe("Remove", func() {
Context("when the image ID is not namespaced", func() {
It("should return the error when cake fails", func() {
cake.RemoveReturns(testError)
Expect(aufsCake.Remove(childID)).To(Equal(testError))
})
It("should delegate to the cake", func() {
Expect(aufsCake.Remove(childID)).To(Succeed())
Expect(cake.RemoveCallCount()).To(Equal(1))
Expect(cake.RemoveArgsForCall(0)).To(Equal(childID))
})
})
Context("when the image ID is namespaced", func() {
var (
parentDir string
namespacedChildDir string
otherNamespacedChildDir string
)
BeforeEach(func() {
var err error
parentDir, err = ioutil.TempDir("", "parent-layer")
Expect(err).NotTo(HaveOccurred())