filter added to image pruge command.

filter option accepts two filters.
- label
- until
label supports "label=value" or "label=key=value" format
until supports all golang compatible time/duration formats.

Signed-off-by: Kunal Kushwaha <kunal.kushwaha@gmail.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/libpod/image/image.go b/libpod/image/image.go
index c912ac2ca..5871c8a57 100644
--- a/libpod/image/image.go
+++ b/libpod/image/image.go
@@ -74,6 +74,11 @@ type InfoImage struct {
 	Layers []LayerInfo
 }
 
+// ImageFilter is a function to determine whether a image is included
+// in command output. Images to be outputted are tested using the function.
+// A true return will include the image, a false return will exclude it.
+type ImageFilter func(*Image) bool //nolint
+
 // ErrRepoTagNotFound is the error returned when the image id given doesn't match a rep tag in store
 var ErrRepoTagNotFound = stderrors.New("unable to match user input to any specific repotag")