Move the HostConfig portion of Inspect inside libpod

When we first began writing Podman, we ran into a major issue
when implementing Inspect. Libpod deliberately does not tie its
internal data structures to Docker, and stores most information
about containers encoded within the OCI spec. However, Podman
must present a CLI compatible with Docker, which means it must
expose all the information in 'docker inspect' - most of which is
not contained in the OCI spec or libpod's Config struct.

Our solution at the time was the create artifact. We JSON'd the
complete CreateConfig (a parsed form of the CLI arguments to
'podman run') and stored it with the container, restoring it when
we needed to run commands that required the extra info.

Over the past month, I've been looking more at Inspect, and
refactored large portions of it into Libpod - generating them
from what we know about the OCI config and libpod's (now much
expanded, versus previously) container configuration. This path
comes close to completing the process, moving the last part of
inspect into libpod and removing the need for the create
artifact.

This improves libpod's compatability with non-Podman containers.
We no longer require an arbitrarily-formatted JSON blob to be
present to run inspect.

Fixes: containers#3500

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

cmd/podman/inspect.go

@@ -6,9 +6,7 @@ import (
 
 	"github.com/containers/buildah/pkg/formats"
 	"github.com/containers/libpod/cmd/podman/cliconfig"
-	"github.com/containers/libpod/cmd/podman/shared"
 	"github.com/containers/libpod/pkg/adapter"
-	cc "github.com/containers/libpod/pkg/spec"
 	"github.com/containers/libpod/pkg/util"
 	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
@@ -148,19 +146,9 @@ func iterateInput(ctx context.Context, size bool, args []string, runtime *adapte
 				inspectError = errors.Wrapf(err, "error looking up container %q", input)
 				break
 			}
-			libpodInspectData, err := ctr.Inspect(size)
+			data, err = ctr.Inspect(size)
 			if err != nil {
-				inspectError = errors.Wrapf(err, "error getting libpod container inspect data %s", ctr.ID())
-				break
-			}
-			artifact, err := getArtifact(ctr)
-			if inspectError != nil {
-				inspectError = err
-				break
-			}
-			data, err = shared.GetCtrInspectInfo(ctr.Config(), libpodInspectData, artifact)
-			if err != nil {
-				inspectError = errors.Wrapf(err, "error parsing container data %q", ctr.ID())
+				inspectError = errors.Wrapf(err, "error inspecting container %s", ctr.ID())
 				break
 			}
 		case inspectTypeImage:
@@ -188,19 +176,9 @@ func iterateInput(ctx context.Context, size bool, args []string, runtime *adapte
 					break
 				}
 			} else {
-				libpodInspectData, err := ctr.Inspect(size)
-				if err != nil {
-					inspectError = errors.Wrapf(err, "error getting libpod container inspect data %s", ctr.ID())
-					break
-				}
-				artifact, err := getArtifact(ctr)
+				data, err = ctr.Inspect(size)
 				if err != nil {
-					inspectError = err
-					break
-				}
-				data, err = shared.GetCtrInspectInfo(ctr.Config(), libpodInspectData, artifact)
-				if err != nil {
-					inspectError = errors.Wrapf(err, "error parsing container data %s", ctr.ID())
+					inspectError = errors.Wrapf(err, "error inspecting container %s", ctr.ID())
 					break
 				}
 			}
@@ -211,15 +189,3 @@ func iterateInput(ctx context.Context, size bool, args []string, runtime *adapte
 	}
 	return inspectedItems, inspectError
 }
-
-func getArtifact(ctr *adapter.Container) (*cc.CreateConfig, error) {
-	var createArtifact cc.CreateConfig
-	artifact, err := ctr.GetArtifact("create-config")
-	if err != nil {
-		return nil, err
-	}
-	if err := json.Unmarshal(artifact, &createArtifact); err != nil {
-		return nil, err
-	}
-	return &createArtifact, nil
-}

cmd/podman/shared/create.go

@@ -651,6 +651,7 @@ func ParseCreateOpts(ctx context.Context, c *GenericCLIResults, runtime *libpod.
 		ImageVolumeType:   c.String("image-volume"),
 		CapAdd:            c.StringSlice("cap-add"),
 		CapDrop:           c.StringSlice("cap-drop"),
+		CidFile:           c.String("cidfile"),
 		CgroupParent:      c.String("cgroup-parent"),
 		Command:           command,
 		Detach:            c.Bool("detach"),
@@ -766,14 +767,6 @@ func CreateContainerFromCreateConfig(r *libpod.Runtime, createConfig *cc.CreateC
 	if err != nil {
 		return nil, err
 	}
-
-	createConfigJSON, err := json.Marshal(createConfig)
-	if err != nil {
-		return nil, err
-	}
-	if err := ctr.AddArtifact("create-config", createConfigJSON); err != nil {
-		return nil, err
-	}
 	return ctr, nil
 }
 

go.mod

@@ -101,7 +101,7 @@ require (
 	github.com/spf13/pflag v1.0.3
 	github.com/spf13/viper v1.4.0 // indirect
 	github.com/stretchr/testify v1.3.0
-	github.com/syndtr/gocapability v0.0.0-20180916011248-d98352740cb2 // indirect
+	github.com/syndtr/gocapability v0.0.0-20180916011248-d98352740cb2
 	github.com/tchap/go-patricia v2.3.0+incompatible // indirect
 	github.com/uber/jaeger-client-go v2.16.0+incompatible
 	github.com/uber/jaeger-lib v0.0.0-20190122222657-d036253de8f5 // indirect