Remove ulele/deepcopier in favor of JSON deep copy

We have a very high performance JSON library that doesn't need to
perform code generation. Let's use it instead of our questionably
performant, reflection-dependent deep copy library.

Most changes because some functions can now return errors.

Also converts cmd/podman to use jsoniter, instead of pkg/json,
for increased performance.

Signed-off-by: Matthew Heon <matthew.heon@pm.me>

1 files changed, 10 insertions, 0 deletions

diff --git a/libpod/util.go b/libpod/util.go
index b7578135a..7e2dff21a 100644
--- a/libpod/util.go
+++ b/libpod/util.go
@@ -187,3 +187,13 @@ func validPodNSOption(p *Pod, ctrPod string) error {
 	}
 	return nil
 }
+
+// JSONDeepCopy performs a deep copy by performing a JSON encode/decode of the
+// given structures. From and To should be identically typed structs.
+func JSONDeepCopy(from, to interface{}) error {
+	tmp, err := json.Marshal(from)
+	if err != nil {
+		return err
+	}
+	return json.Unmarshal(tmp, to)
+}