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Extract PrepareImage

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Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alexellis2@gmail.com>
This commit is contained in:
Alex Ellis (OpenFaaS Ltd)
2019-12-28 19:09:42 +00:00
parent 13d28bd2db
commit 6c3fe813fd
2 changed files with 31 additions and 33 deletions
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30
pkg/service/service.go
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@ -79,3 +79,33 @@ func killTask(ctx context.Context, task containerd.Task) error {
return err
}
func PrepareImage(ctx context.Context, client *containerd.Client, imageName, snapshotter string) (containerd.Image, error) {
var empty containerd.Image
image, err := client.GetImage(ctx, imageName)
if err != nil {
if !errdefs.IsNotFound(err) {
return empty, err
}
img, err := client.Pull(ctx, imageName, containerd.WithPullUnpack)
if err != nil {
return empty, fmt.Errorf("cannot pull: %s", err)
}
image = img
}
unpacked, err := image.IsUnpacked(ctx, snapshotter)
if err != nil {
return empty, fmt.Errorf("cannot check if unpacked: %s", err)
}
if !unpacked {
if err := image.Unpack(ctx, snapshotter); err != nil {
return empty, fmt.Errorf("cannot unpack: %s", err)
}
}
return image, nil
}