integration test: use fedora-minimal for most manifest list tests

Switch most of our tests that exercise reading, copying from, and
inspecting tags that point to manifest lists from using
docker.io/estesp/busybox to using
registry.fedoraproject.org/fedora-minimal, which doesn't limit how often
we can pull the images.

Signed-off-by: Nalin Dahyabhai <nalin@redhat.com>
This commit is contained in:
Nalin Dahyabhai 2021-01-07 17:13:26 -05:00
parent c4fb93647a
commit b3a15e7288

View File

@ -31,6 +31,7 @@ const (
v2DockerRegistryURL = "localhost:5555" // Update also policy.json
v2s1DockerRegistryURL = "localhost:5556"
knownWindowsOnlyImage = "docker://mcr.microsoft.com/windows/nanoserver:1909"
knownListImage = "docker://registry.fedoraproject.org/fedora-minimal" // could have either ":latest" or "@sha256:..." appended
)
type CopySuite struct {
@ -99,14 +100,14 @@ func (s *CopySuite) TestCopyWithManifestList(c *check.C) {
dir, err := ioutil.TempDir("", "copy-manifest-list")
c.Assert(err, check.IsNil)
defer os.RemoveAll(dir)
assertSkopeoSucceeds(c, "", "copy", "docker://estesp/busybox:latest", "dir:"+dir)
assertSkopeoSucceeds(c, "", "copy", knownListImage, "dir:"+dir)
}
func (s *CopySuite) TestCopyAllWithManifestList(c *check.C) {
dir, err := ioutil.TempDir("", "copy-all-manifest-list")
c.Assert(err, check.IsNil)
defer os.RemoveAll(dir)
assertSkopeoSucceeds(c, "", "copy", "--all", "docker://estesp/busybox:latest", "dir:"+dir)
assertSkopeoSucceeds(c, "", "copy", "--all", knownListImage, "dir:"+dir)
}
func (s *CopySuite) TestCopyAllWithManifestListRoundTrip(c *check.C) {
@ -122,7 +123,7 @@ func (s *CopySuite) TestCopyAllWithManifestListRoundTrip(c *check.C) {
dir2, err := ioutil.TempDir("", "copy-all-manifest-list-dir")
c.Assert(err, check.IsNil)
defer os.RemoveAll(dir2)
assertSkopeoSucceeds(c, "", "copy", "--all", "docker://estesp/busybox:latest", "oci:"+oci1)
assertSkopeoSucceeds(c, "", "copy", "--all", knownListImage, "oci:"+oci1)
assertSkopeoSucceeds(c, "", "copy", "--all", "oci:"+oci1, "dir:"+dir1)
assertSkopeoSucceeds(c, "", "copy", "--all", "dir:"+dir1, "oci:"+oci2)
assertSkopeoSucceeds(c, "", "copy", "--all", "oci:"+oci2, "dir:"+dir2)
@ -144,9 +145,9 @@ func (s *CopySuite) TestCopyAllWithManifestListConverge(c *check.C) {
dir2, err := ioutil.TempDir("", "copy-all-manifest-list-dir")
c.Assert(err, check.IsNil)
defer os.RemoveAll(dir2)
assertSkopeoSucceeds(c, "", "copy", "--all", "docker://estesp/busybox:latest", "oci:"+oci1)
assertSkopeoSucceeds(c, "", "copy", "--all", knownListImage, "oci:"+oci1)
assertSkopeoSucceeds(c, "", "copy", "--all", "oci:"+oci1, "dir:"+dir1)
assertSkopeoSucceeds(c, "", "copy", "--all", "--format", "oci", "docker://estesp/busybox:latest", "dir:"+dir2)
assertSkopeoSucceeds(c, "", "copy", "--all", "--format", "oci", knownListImage, "dir:"+dir2)
assertSkopeoSucceeds(c, "", "copy", "--all", "dir:"+dir2, "oci:"+oci2)
assertDirImagesAreEqual(c, dir1, dir2)
out := combinedOutputOfCommand(c, "diff", "-urN", oci1, oci2)
@ -166,9 +167,9 @@ func (s *CopySuite) TestCopyWithManifestListConverge(c *check.C) {
dir2, err := ioutil.TempDir("", "copy-all-manifest-list-dir")
c.Assert(err, check.IsNil)
defer os.RemoveAll(dir2)
assertSkopeoSucceeds(c, "", "copy", "docker://estesp/busybox:latest", "oci:"+oci1)
assertSkopeoSucceeds(c, "", "copy", knownListImage, "oci:"+oci1)
assertSkopeoSucceeds(c, "", "copy", "--all", "oci:"+oci1, "dir:"+dir1)
assertSkopeoSucceeds(c, "", "copy", "--format", "oci", "docker://estesp/busybox:latest", "dir:"+dir2)
assertSkopeoSucceeds(c, "", "copy", "--format", "oci", knownListImage, "dir:"+dir2)
assertSkopeoSucceeds(c, "", "copy", "--all", "dir:"+dir2, "oci:"+oci2)
assertDirImagesAreEqual(c, dir1, dir2)
out := combinedOutputOfCommand(c, "diff", "-urN", oci1, oci2)
@ -180,7 +181,7 @@ func (s *CopySuite) TestCopyAllWithManifestListStorageFails(c *check.C) {
c.Assert(err, check.IsNil)
defer os.RemoveAll(storage)
storage = fmt.Sprintf("[vfs@%s/root+%s/runroot]", storage, storage)
assertSkopeoFails(c, `.*destination transport .* does not support copying multiple images as a group.*`, "copy", "--all", "docker://estesp/busybox:latest", "containers-storage:"+storage+"test")
assertSkopeoFails(c, `.*destination transport .* does not support copying multiple images as a group.*`, "copy", "--all", knownListImage, "containers-storage:"+storage+"test")
}
func (s *CopySuite) TestCopyWithManifestListStorage(c *check.C) {
@ -194,8 +195,8 @@ func (s *CopySuite) TestCopyWithManifestListStorage(c *check.C) {
dir2, err := ioutil.TempDir("", "copy-manifest-list-storage-dir")
c.Assert(err, check.IsNil)
defer os.RemoveAll(dir2)
assertSkopeoSucceeds(c, "", "copy", "docker://estesp/busybox:latest", "containers-storage:"+storage+"test")
assertSkopeoSucceeds(c, "", "copy", "docker://estesp/busybox:latest", "dir:"+dir1)
assertSkopeoSucceeds(c, "", "copy", knownListImage, "containers-storage:"+storage+"test")
assertSkopeoSucceeds(c, "", "copy", knownListImage, "dir:"+dir1)
assertSkopeoSucceeds(c, "", "copy", "containers-storage:"+storage+"test", "dir:"+dir2)
runDecompressDirs(c, "", dir1, dir2)
assertDirImagesAreEqual(c, dir1, dir2)
@ -212,9 +213,9 @@ func (s *CopySuite) TestCopyWithManifestListStorageMultiple(c *check.C) {
dir2, err := ioutil.TempDir("", "copy-manifest-list-storage-multiple-dir")
c.Assert(err, check.IsNil)
defer os.RemoveAll(dir2)
assertSkopeoSucceeds(c, "", "--override-arch", "amd64", "copy", "docker://estesp/busybox:latest", "containers-storage:"+storage+"test")
assertSkopeoSucceeds(c, "", "--override-arch", "arm64", "copy", "docker://estesp/busybox:latest", "containers-storage:"+storage+"test")
assertSkopeoSucceeds(c, "", "--override-arch", "arm64", "copy", "docker://estesp/busybox:latest", "dir:"+dir1)
assertSkopeoSucceeds(c, "", "--override-arch", "amd64", "copy", knownListImage, "containers-storage:"+storage+"test")
assertSkopeoSucceeds(c, "", "--override-arch", "arm64", "copy", knownListImage, "containers-storage:"+storage+"test")
assertSkopeoSucceeds(c, "", "--override-arch", "arm64", "copy", knownListImage, "dir:"+dir1)
assertSkopeoSucceeds(c, "", "copy", "containers-storage:"+storage+"test", "dir:"+dir2)
runDecompressDirs(c, "", dir1, dir2)
assertDirImagesAreEqual(c, dir1, dir2)
@ -233,12 +234,12 @@ func (s *CopySuite) TestCopyWithManifestListDigest(c *check.C) {
oci2, err := ioutil.TempDir("", "copy-manifest-list-digest-oci")
c.Assert(err, check.IsNil)
defer os.RemoveAll(oci2)
m := combinedOutputOfCommand(c, skopeoBinary, "inspect", "--raw", "docker://estesp/busybox:latest")
m := combinedOutputOfCommand(c, skopeoBinary, "inspect", "--raw", knownListImage)
manifestDigest, err := manifest.Digest([]byte(m))
c.Assert(err, check.IsNil)
digest := manifestDigest.String()
assertSkopeoSucceeds(c, "", "copy", "docker://estesp/busybox@"+digest, "dir:"+dir1)
assertSkopeoSucceeds(c, "", "copy", "--all", "docker://estesp/busybox@"+digest, "dir:"+dir2)
assertSkopeoSucceeds(c, "", "copy", knownListImage+"@"+digest, "dir:"+dir1)
assertSkopeoSucceeds(c, "", "copy", "--all", knownListImage+"@"+digest, "dir:"+dir2)
assertSkopeoSucceeds(c, "", "copy", "dir:"+dir1, "oci:"+oci1)
assertSkopeoSucceeds(c, "", "copy", "dir:"+dir2, "oci:"+oci2)
out := combinedOutputOfCommand(c, "diff", "-urN", oci1, oci2)
@ -256,13 +257,13 @@ func (s *CopySuite) TestCopyWithManifestListStorageDigest(c *check.C) {
dir2, err := ioutil.TempDir("", "copy-manifest-list-storage-digest-dir")
c.Assert(err, check.IsNil)
defer os.RemoveAll(dir2)
m := combinedOutputOfCommand(c, skopeoBinary, "inspect", "--raw", "docker://estesp/busybox:latest")
m := combinedOutputOfCommand(c, skopeoBinary, "inspect", "--raw", knownListImage)
manifestDigest, err := manifest.Digest([]byte(m))
c.Assert(err, check.IsNil)
digest := manifestDigest.String()
assertSkopeoSucceeds(c, "", "copy", "docker://estesp/busybox@"+digest, "containers-storage:"+storage+"test@"+digest)
assertSkopeoSucceeds(c, "", "copy", knownListImage+"@"+digest, "containers-storage:"+storage+"test@"+digest)
assertSkopeoSucceeds(c, "", "copy", "containers-storage:"+storage+"test@"+digest, "dir:"+dir1)
assertSkopeoSucceeds(c, "", "copy", "docker://estesp/busybox@"+digest, "dir:"+dir2)
assertSkopeoSucceeds(c, "", "copy", knownListImage+"@"+digest, "dir:"+dir2)
runDecompressDirs(c, "", dir1, dir2)
assertDirImagesAreEqual(c, dir1, dir2)
}
@ -278,13 +279,13 @@ func (s *CopySuite) TestCopyWithManifestListStorageDigestMultipleArches(c *check
dir2, err := ioutil.TempDir("", "copy-manifest-list-storage-digest-dir")
c.Assert(err, check.IsNil)
defer os.RemoveAll(dir2)
m := combinedOutputOfCommand(c, skopeoBinary, "inspect", "--raw", "docker://estesp/busybox:latest")
m := combinedOutputOfCommand(c, skopeoBinary, "inspect", "--raw", knownListImage)
manifestDigest, err := manifest.Digest([]byte(m))
c.Assert(err, check.IsNil)
digest := manifestDigest.String()
assertSkopeoSucceeds(c, "", "copy", "docker://estesp/busybox@"+digest, "containers-storage:"+storage+"test@"+digest)
assertSkopeoSucceeds(c, "", "copy", knownListImage+"@"+digest, "containers-storage:"+storage+"test@"+digest)
assertSkopeoSucceeds(c, "", "copy", "containers-storage:"+storage+"test@"+digest, "dir:"+dir1)
assertSkopeoSucceeds(c, "", "copy", "docker://estesp/busybox@"+digest, "dir:"+dir2)
assertSkopeoSucceeds(c, "", "copy", knownListImage+"@"+digest, "dir:"+dir2)
runDecompressDirs(c, "", dir1, dir2)
assertDirImagesAreEqual(c, dir1, dir2)
}
@ -294,14 +295,14 @@ func (s *CopySuite) TestCopyWithManifestListStorageDigestMultipleArchesBothUseLi
c.Assert(err, check.IsNil)
defer os.RemoveAll(storage)
storage = fmt.Sprintf("[vfs@%s/root+%s/runroot]", storage, storage)
m := combinedOutputOfCommand(c, skopeoBinary, "inspect", "--raw", "docker://estesp/busybox:latest")
m := combinedOutputOfCommand(c, skopeoBinary, "inspect", "--raw", knownListImage)
manifestDigest, err := manifest.Digest([]byte(m))
c.Assert(err, check.IsNil)
digest := manifestDigest.String()
_, err = manifest.ListFromBlob([]byte(m), manifest.GuessMIMEType([]byte(m)))
c.Assert(err, check.IsNil)
assertSkopeoSucceeds(c, "", "--override-arch=amd64", "copy", "docker://estesp/busybox@"+digest, "containers-storage:"+storage+"test@"+digest)
assertSkopeoSucceeds(c, "", "--override-arch=arm64", "copy", "docker://estesp/busybox@"+digest, "containers-storage:"+storage+"test@"+digest)
assertSkopeoSucceeds(c, "", "--override-arch=amd64", "copy", knownListImage+"@"+digest, "containers-storage:"+storage+"test@"+digest)
assertSkopeoSucceeds(c, "", "--override-arch=arm64", "copy", knownListImage+"@"+digest, "containers-storage:"+storage+"test@"+digest)
assertSkopeoFails(c, `.*error reading manifest for image instance.*does not exist.*`, "--override-arch=amd64", "inspect", "containers-storage:"+storage+"test@"+digest)
assertSkopeoFails(c, `.*error reading manifest for image instance.*does not exist.*`, "--override-arch=amd64", "inspect", "--config", "containers-storage:"+storage+"test@"+digest)
i2 := combinedOutputOfCommand(c, skopeoBinary, "--override-arch=arm64", "inspect", "--config", "containers-storage:"+storage+"test@"+digest)
@ -316,7 +317,7 @@ func (s *CopySuite) TestCopyWithManifestListStorageDigestMultipleArchesFirstUses
c.Assert(err, check.IsNil)
defer os.RemoveAll(storage)
storage = fmt.Sprintf("[vfs@%s/root+%s/runroot]", storage, storage)
m := combinedOutputOfCommand(c, skopeoBinary, "inspect", "--raw", "docker://estesp/busybox:latest")
m := combinedOutputOfCommand(c, skopeoBinary, "inspect", "--raw", knownListImage)
manifestDigest, err := manifest.Digest([]byte(m))
c.Assert(err, check.IsNil)
digest := manifestDigest.String()
@ -326,8 +327,8 @@ func (s *CopySuite) TestCopyWithManifestListStorageDigestMultipleArchesFirstUses
c.Assert(err, check.IsNil)
arm64Instance, err := list.ChooseInstance(&types.SystemContext{ArchitectureChoice: "arm64"})
c.Assert(err, check.IsNil)
assertSkopeoSucceeds(c, "", "--override-arch=amd64", "copy", "docker://estesp/busybox@"+digest, "containers-storage:"+storage+"test@"+digest)
assertSkopeoSucceeds(c, "", "--override-arch=arm64", "copy", "docker://estesp/busybox@"+arm64Instance.String(), "containers-storage:"+storage+"test@"+arm64Instance.String())
assertSkopeoSucceeds(c, "", "--override-arch=amd64", "copy", knownListImage+"@"+digest, "containers-storage:"+storage+"test@"+digest)
assertSkopeoSucceeds(c, "", "--override-arch=arm64", "copy", knownListImage+"@"+arm64Instance.String(), "containers-storage:"+storage+"test@"+arm64Instance.String())
i1 := combinedOutputOfCommand(c, skopeoBinary, "--override-arch=amd64", "inspect", "--config", "containers-storage:"+storage+"test@"+digest)
var image1 imgspecv1.Image
err = json.Unmarshal([]byte(i1), &image1)
@ -352,7 +353,7 @@ func (s *CopySuite) TestCopyWithManifestListStorageDigestMultipleArchesSecondUse
c.Assert(err, check.IsNil)
defer os.RemoveAll(storage)
storage = fmt.Sprintf("[vfs@%s/root+%s/runroot]", storage, storage)
m := combinedOutputOfCommand(c, skopeoBinary, "inspect", "--raw", "docker://estesp/busybox:latest")
m := combinedOutputOfCommand(c, skopeoBinary, "inspect", "--raw", knownListImage)
manifestDigest, err := manifest.Digest([]byte(m))
c.Assert(err, check.IsNil)
digest := manifestDigest.String()
@ -362,8 +363,8 @@ func (s *CopySuite) TestCopyWithManifestListStorageDigestMultipleArchesSecondUse
c.Assert(err, check.IsNil)
arm64Instance, err := list.ChooseInstance(&types.SystemContext{ArchitectureChoice: "arm64"})
c.Assert(err, check.IsNil)
assertSkopeoSucceeds(c, "", "--override-arch=amd64", "copy", "docker://estesp/busybox@"+amd64Instance.String(), "containers-storage:"+storage+"test@"+amd64Instance.String())
assertSkopeoSucceeds(c, "", "--override-arch=arm64", "copy", "docker://estesp/busybox@"+digest, "containers-storage:"+storage+"test@"+digest)
assertSkopeoSucceeds(c, "", "--override-arch=amd64", "copy", knownListImage+"@"+amd64Instance.String(), "containers-storage:"+storage+"test@"+amd64Instance.String())
assertSkopeoSucceeds(c, "", "--override-arch=arm64", "copy", knownListImage+"@"+digest, "containers-storage:"+storage+"test@"+digest)
i1 := combinedOutputOfCommand(c, skopeoBinary, "--override-arch=amd64", "inspect", "--config", "containers-storage:"+storage+"test@"+amd64Instance.String())
var image1 imgspecv1.Image
err = json.Unmarshal([]byte(i1), &image1)
@ -388,7 +389,7 @@ func (s *CopySuite) TestCopyWithManifestListStorageDigestMultipleArchesThirdUses
c.Assert(err, check.IsNil)
defer os.RemoveAll(storage)
storage = fmt.Sprintf("[vfs@%s/root+%s/runroot]", storage, storage)
m := combinedOutputOfCommand(c, skopeoBinary, "inspect", "--raw", "docker://estesp/busybox:latest")
m := combinedOutputOfCommand(c, skopeoBinary, "inspect", "--raw", knownListImage)
manifestDigest, err := manifest.Digest([]byte(m))
c.Assert(err, check.IsNil)
digest := manifestDigest.String()
@ -398,9 +399,9 @@ func (s *CopySuite) TestCopyWithManifestListStorageDigestMultipleArchesThirdUses
c.Assert(err, check.IsNil)
arm64Instance, err := list.ChooseInstance(&types.SystemContext{ArchitectureChoice: "arm64"})
c.Assert(err, check.IsNil)
assertSkopeoSucceeds(c, "", "--override-arch=amd64", "copy", "docker://estesp/busybox@"+amd64Instance.String(), "containers-storage:"+storage+"test@"+amd64Instance.String())
assertSkopeoSucceeds(c, "", "--override-arch=amd64", "copy", "docker://estesp/busybox@"+digest, "containers-storage:"+storage+"test@"+digest)
assertSkopeoSucceeds(c, "", "--override-arch=arm64", "copy", "docker://estesp/busybox@"+digest, "containers-storage:"+storage+"test@"+digest)
assertSkopeoSucceeds(c, "", "--override-arch=amd64", "copy", knownListImage+"@"+amd64Instance.String(), "containers-storage:"+storage+"test@"+amd64Instance.String())
assertSkopeoSucceeds(c, "", "--override-arch=amd64", "copy", knownListImage+"@"+digest, "containers-storage:"+storage+"test@"+digest)
assertSkopeoSucceeds(c, "", "--override-arch=arm64", "copy", knownListImage+"@"+digest, "containers-storage:"+storage+"test@"+digest)
assertSkopeoFails(c, `.*error reading manifest for image instance.*does not exist.*`, "--override-arch=amd64", "inspect", "--config", "containers-storage:"+storage+"test@"+digest)
i1 := combinedOutputOfCommand(c, skopeoBinary, "--override-arch=amd64", "inspect", "--config", "containers-storage:"+storage+"test@"+amd64Instance.String())
var image1 imgspecv1.Image
@ -424,7 +425,7 @@ func (s *CopySuite) TestCopyWithManifestListStorageDigestMultipleArchesTagAndDig
c.Assert(err, check.IsNil)
defer os.RemoveAll(storage)
storage = fmt.Sprintf("[vfs@%s/root+%s/runroot]", storage, storage)
m := combinedOutputOfCommand(c, skopeoBinary, "inspect", "--raw", "docker://estesp/busybox:latest")
m := combinedOutputOfCommand(c, skopeoBinary, "inspect", "--raw", knownListImage)
manifestDigest, err := manifest.Digest([]byte(m))
c.Assert(err, check.IsNil)
digest := manifestDigest.String()
@ -434,8 +435,8 @@ func (s *CopySuite) TestCopyWithManifestListStorageDigestMultipleArchesTagAndDig
c.Assert(err, check.IsNil)
arm64Instance, err := list.ChooseInstance(&types.SystemContext{ArchitectureChoice: "arm64"})
c.Assert(err, check.IsNil)
assertSkopeoSucceeds(c, "", "--override-arch=amd64", "copy", "docker://estesp/busybox:latest", "containers-storage:"+storage+"test:latest")
assertSkopeoSucceeds(c, "", "--override-arch=arm64", "copy", "docker://estesp/busybox@"+digest, "containers-storage:"+storage+"test@"+digest)
assertSkopeoSucceeds(c, "", "--override-arch=amd64", "copy", knownListImage, "containers-storage:"+storage+"test:latest")
assertSkopeoSucceeds(c, "", "--override-arch=arm64", "copy", knownListImage+"@"+digest, "containers-storage:"+storage+"test@"+digest)
assertSkopeoFails(c, `.*error reading manifest for image instance.*does not exist.*`, "--override-arch=amd64", "inspect", "--config", "containers-storage:"+storage+"test@"+digest)
i1 := combinedOutputOfCommand(c, skopeoBinary, "--override-arch=arm64", "inspect", "--config", "containers-storage:"+storage+"test:latest")
var image1 imgspecv1.Image
@ -511,28 +512,28 @@ func (s *CopySuite) TestCopySimple(c *check.C) {
// FIXME: It would be nice to use one of the local Docker registries instead of needing an Internet connection.
// "pull": docker: → dir:
assertSkopeoSucceeds(c, "", "copy", "docker://busybox", "dir:"+dir1)
assertSkopeoSucceeds(c, "", "copy", "docker://k8s.gcr.io/pause", "dir:"+dir1)
// "push": dir: → docker(v2s2):
assertSkopeoSucceeds(c, "", "--tls-verify=false", "--debug", "copy", "dir:"+dir1, ourRegistry+"busybox:unsigned")
assertSkopeoSucceeds(c, "", "--tls-verify=false", "--debug", "copy", "dir:"+dir1, ourRegistry+"pause:unsigned")
// The result of pushing and pulling is an unmodified image.
assertSkopeoSucceeds(c, "", "--tls-verify=false", "copy", ourRegistry+"busybox:unsigned", "dir:"+dir2)
assertSkopeoSucceeds(c, "", "--tls-verify=false", "copy", ourRegistry+"pause:unsigned", "dir:"+dir2)
out := combinedOutputOfCommand(c, "diff", "-urN", dir1, dir2)
c.Assert(out, check.Equals, "")
// docker v2s2 -> OCI image layout with image name
// ociDest will be created by oci: if it doesn't exist
// so don't create it here to exercise auto-creation
ociDest := "busybox-latest-image"
ociImgName := "busybox"
ociDest := "pause-latest-image"
ociImgName := "pause"
defer os.RemoveAll(ociDest)
assertSkopeoSucceeds(c, "", "copy", "docker://busybox:latest", "oci:"+ociDest+":"+ociImgName)
assertSkopeoSucceeds(c, "", "copy", "docker://k8s.gcr.io/pause:latest", "oci:"+ociDest+":"+ociImgName)
_, err = os.Stat(ociDest)
c.Assert(err, check.IsNil)
// docker v2s2 -> OCI image layout without image name
ociDest = "busybox-latest-noimage"
ociDest = "pause-latest-noimage"
defer os.RemoveAll(ociDest)
assertSkopeoSucceeds(c, "", "copy", "docker://busybox:latest", "oci:"+ociDest)
assertSkopeoSucceeds(c, "", "copy", "docker://k8s.gcr.io/pause:latest", "oci:"+ociDest)
_, err = os.Stat(ociDest)
c.Assert(err, check.IsNil)
}