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reliably remove image when content missing

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Signed-off-by: yason <yan.xuean@zte.com.cn>
This commit is contained in:
yason 2017-12-12 17:45:06 +08:00
parent 4762b3e273
commit 5f6d9a5fcc
2 changed files with 23 additions and 7 deletions
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3
pkg/server/image_pull.go
View File

@ -59,6 +59,9 @@ import (
// if we saw an image without snapshots or with in-complete contents during startup,
// should we re-pull the image? Or should we remove the entry?
//
// yanxuean: We cann't delete image directly, because we don't know if the image
// is pulled by us. There are resource leakage.
//
// 2) Containerd suggests user to add entry before pulling the image. However if
// an error occurrs during the pulling, should we remove the entry from metadata
// store? Or should we leave it there until next startup (resource leakage)?

27
pkg/server/image_remove.go
View File

@ -42,7 +42,7 @@ func (c *criContainerdService) RemoveImage(ctx context.Context, r *runtime.Remov
return &runtime.RemoveImageResponse{}, nil
}
// Exclude out dated image tag.
// Exclude outdated image tag.
for i, tag := range image.RepoTags {
cImage, err := c.client.GetImage(ctx, tag)
if err != nil {
@ -53,14 +53,27 @@ func (c *criContainerdService) RemoveImage(ctx context.Context, r *runtime.Remov
}
desc, err := cImage.Config(ctx)
if err != nil {
return nil, fmt.Errorf("failed to get image %q config descriptor: %v", tag, err)
}
cID := desc.Digest.String()
if cID == image.ID {
// We can only get image id by reading Config from content.
// If the config is missing, we will fail to get image id,
// So we will can't remove the image forever,
// and cri-containerd always report the image is ok.
// But we also don't check it by manifest,
// It's possible that two manifest digests have the same image ID in theory.
// In theory it's possible that an image is compressed with different algorithms,
// then they'll have the same uncompressed id - image id,
// but different ids generated from compressed contents - manifest digest.
// So we decide to leave it.
// After all, the user can override the repoTag by pulling image again.
glog.Errorf("can't remove image,failed to get config for Image tag %q,id %q: %v", tag, image.ID, err)
image.RepoTags = append(image.RepoTags[:i], image.RepoTags[i+1:]...)
continue
}
cID := desc.Digest.String()
if cID != image.ID {
glog.V(4).Infof("Image tag %q for %q is outdated, it's currently used by %q", tag, image.ID, cID)
image.RepoTags = append(image.RepoTags[:i], image.RepoTags[i+1:]...)
continue
}
glog.V(4).Infof("Image tag %q for %q is out dated, it's currently used by %q", tag, image.ID, cID)
image.RepoTags = append(image.RepoTags[:i], image.RepoTags[i+1:]...)
}
// Include all image references, including RepoTag, RepoDigest and id.