Add a new function for converting a CreateConfig

Right now, there are two major API calls necessary to turn a
filled-in CreateConfig into the options and OCI spec necessary to
make a libpod Container. I'm intending on refactoring both of
these extensively to unify a few things, so make a common
frontend to both that will prevent API changes from leaking out
of the package.

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

3 files changed, 24 insertions, 2 deletions

diff --git a/pkg/spec/containerconfig.go b/pkg/spec/containerconfig.go
new file mode 100644
index 000000000..62108c012
--- /dev/null
+++ b/pkg/spec/containerconfig.go
@@ -0,0 +1,22 @@
+package createconfig
+
+import (
+	"github.com/containers/libpod/libpod"
+	spec "github.com/opencontainers/runtime-spec/specs-go"
+)
+
+// MakeContainerConfig generates all configuration necessary to start a
+// container with libpod from a completed CreateConfig struct.
+func (config *CreateConfig) MakeContainerConfig(runtime *libpod.Runtime, pod *libpod.Pod) (*spec.Spec, []libpod.CtrCreateOption, error) {
+	runtimeSpec, err := config.createConfigToOCISpec()
+	if err != nil {
+		return nil, nil, err
+	}
+
+	options, err := config.getContainerCreateOptions(runtime, pod)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	return runtimeSpec, options, nil
+}
diff --git a/pkg/spec/createconfig.go b/pkg/spec/createconfig.go
index 9c674d9f1..76ce8032c 100644
--- a/pkg/spec/createconfig.go
+++ b/pkg/spec/createconfig.go
@@ -397,7 +397,7 @@ func (c *CreateConfig) createExitCommand() ([]string, error) {
 }
 
 // GetContainerCreateOptions takes a CreateConfig and returns a slice of CtrCreateOptions
-func (c *CreateConfig) GetContainerCreateOptions(runtime *libpod.Runtime, pod *libpod.Pod) ([]libpod.CtrCreateOption, error) {
+func (c *CreateConfig) getContainerCreateOptions(runtime *libpod.Runtime, pod *libpod.Pod) ([]libpod.CtrCreateOption, error) {
 	var options []libpod.CtrCreateOption
 	var portBindings []ocicni.PortMapping
 	var err error
diff --git a/pkg/spec/spec.go b/pkg/spec/spec.go
index 383eeadf3..4c839921c 100644
--- a/pkg/spec/spec.go
+++ b/pkg/spec/spec.go
@@ -89,7 +89,7 @@ func getAvailableGids() (int64, error) {
 }
 
 // CreateConfigToOCISpec parses information needed to create a container into an OCI runtime spec
-func CreateConfigToOCISpec(config *CreateConfig) (*spec.Spec, error) { //nolint
+func (config *CreateConfig) createConfigToOCISpec() (*spec.Spec, error) { //nolint
 	cgroupPerm := "ro"
 	g, err := generate.New("linux")
 	if err != nil {