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>

12 files changed, 43 insertions, 17 deletions

diff --git a/cmd/podman/commit.go b/cmd/podman/commit.go
index 584ab6880..f7e206856 100644
--- a/cmd/podman/commit.go
+++ b/cmd/podman/commit.go
@@ -96,9 +96,14 @@ func commitCmd(c *cliconfig.CommitValues) error {
 		return errors.Wrapf(err, "error looking up container %q", container)
 	}
 
-	sc := image.GetSystemContext(runtime.GetConfig().SignaturePolicyPath, "", false)
+	rtc, err := runtime.GetConfig()
+	if err != nil {
+		return err
+	}
+
+	sc := image.GetSystemContext(rtc.SignaturePolicyPath, "", false)
 	coptions := buildah.CommitOptions{
-		SignaturePolicyPath:   runtime.GetConfig().SignaturePolicyPath,
+		SignaturePolicyPath:   rtc.SignaturePolicyPath,
 		ReportWriter:          writer,
 		SystemContext:         sc,
 		PreferredManifestType: mimeType,
diff --git a/cmd/podman/common.go b/cmd/podman/common.go
index 167b3e845..10fed053e 100644
--- a/cmd/podman/common.go
+++ b/cmd/podman/common.go
@@ -12,12 +12,14 @@ import (
 	"github.com/containers/libpod/pkg/rootless"
 	"github.com/containers/storage"
 	"github.com/fatih/camelcase"
+	jsoniter "github.com/json-iterator/go"
 	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
 )
 
 var (
 	stores = make(map[storage.Store]struct{})
+	json   = jsoniter.ConfigCompatibleWithStandardLibrary
 )
 
 const (
diff --git a/cmd/podman/inspect.go b/cmd/podman/inspect.go
index 3d6fd07e0..528320170 100644
--- a/cmd/podman/inspect.go
+++ b/cmd/podman/inspect.go
@@ -2,7 +2,6 @@ package main
 
 import (
 	"context"
-	"encoding/json"
 	"strings"
 
 	"github.com/containers/buildah/pkg/formats"
diff --git a/cmd/podman/mount.go b/cmd/podman/mount.go
index d074551ce..138548097 100644
--- a/cmd/podman/mount.go
+++ b/cmd/podman/mount.go
@@ -71,7 +71,11 @@ func mountCmd(c *cliconfig.MountValues) error {
 	defer runtime.Shutdown(false)
 
 	if os.Geteuid() != 0 {
-		if driver := runtime.GetConfig().StorageConfig.GraphDriverName; driver != "vfs" {
+		rtc, err := runtime.GetConfig()
+		if err != nil {
+			return err
+		}
+		if driver := rtc.StorageConfig.GraphDriverName; driver != "vfs" {
 			// Do not allow to mount a graphdriver that is not vfs if we are creating the userns as part
 			// of the mount command.
 			return fmt.Errorf("cannot mount using driver %s in rootless mode", driver)
diff --git a/cmd/podman/pod_inspect.go b/cmd/podman/pod_inspect.go
index 851f39aa0..e12678354 100644
--- a/cmd/podman/pod_inspect.go
+++ b/cmd/podman/pod_inspect.go
@@ -1,7 +1,6 @@
 package main
 
 import (
-	"encoding/json"
 	"fmt"
 
 	"github.com/containers/libpod/cmd/podman/cliconfig"
diff --git a/cmd/podman/pod_stats.go b/cmd/podman/pod_stats.go
index e8ff322ce..36b0b95ed 100644
--- a/cmd/podman/pod_stats.go
+++ b/cmd/podman/pod_stats.go
@@ -9,7 +9,6 @@ import (
 	"text/tabwriter"
 	"time"
 
-	"encoding/json"
 	tm "github.com/buger/goterm"
 	"github.com/containers/buildah/pkg/formats"
 	"github.com/containers/libpod/cmd/podman/cliconfig"
@@ -17,7 +16,6 @@ import (
 	"github.com/containers/libpod/pkg/adapter"
 	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
-	"github.com/ulule/deepcopier"
 )
 
 var (
@@ -187,7 +185,9 @@ func podStatsCmd(c *cliconfig.PodStatsValues) error {
 		}
 		time.Sleep(time.Second)
 		previousPodStats := new([]*libpod.PodContainerStats)
-		deepcopier.Copy(newStats).To(previousPodStats)
+		if err := libpod.JSONDeepCopy(newStats, previousPodStats); err != nil {
+			return err
+		}
 		pods, err = runtime.GetStatPods(c)
 		if err != nil {
 			return err
diff --git a/cmd/podman/ps.go b/cmd/podman/ps.go
index 27774f95d..098d18fa4 100644
--- a/cmd/podman/ps.go
+++ b/cmd/podman/ps.go
@@ -1,7 +1,6 @@
 package main
 
 import (
-	"encoding/json"
 	"fmt"
 	"html/template"
 	"os"
diff --git a/cmd/podman/run.go b/cmd/podman/run.go
index 32e7b3510..3c26e98c1 100644
--- a/cmd/podman/run.go
+++ b/cmd/podman/run.go
@@ -154,7 +154,11 @@ func runCmd(c *cliconfig.RunValues) error {
 		if errors.Cause(err) == libpod.ErrNoSuchCtr {
 			// The container may have been removed
 			// Go looking for an exit file
-			ctrExitCode, err := readExitFile(runtime.GetConfig().TmpDir, ctr.ID())
+			rtc, err := runtime.GetConfig()
+			if err != nil {
+				return err
+			}
+			ctrExitCode, err := readExitFile(rtc.TmpDir, ctr.ID())
 			if err != nil {
 				logrus.Errorf("Cannot get exit code: %v", err)
 				exitCode = 127
diff --git a/cmd/podman/shared/create.go b/cmd/podman/shared/create.go
index 5f7263cb6..35f1dadf2 100644
--- a/cmd/podman/shared/create.go
+++ b/cmd/podman/shared/create.go
@@ -43,20 +43,23 @@ func getContext() context.Context {
 func CreateContainer(ctx context.Context, c *cliconfig.PodmanCommand, runtime *libpod.Runtime) (*libpod.Container, *cc.CreateConfig, error) {
 	var (
 		healthCheck *manifest.Schema2HealthConfig
+		err error
+		cidFile *os.File
 	)
 	if c.Bool("trace") {
 		span, _ := opentracing.StartSpanFromContext(ctx, "createContainer")
 		defer span.Finish()
 	}
 
-	rtc := runtime.GetConfig()
+	rtc, err := runtime.GetConfig()
+	if err != nil {
+		return nil, nil, err
+	}
 	rootfs := ""
 	if c.Bool("rootfs") {
 		rootfs = c.InputArgs[0]
 	}
 
-	var err error
-	var cidFile *os.File
 	if c.IsSet("cidfile") && os.Geteuid() == 0 {
 		cidFile, err = libpod.OpenExclusiveFile(c.String("cidfile"))
 		if err != nil && os.IsExist(err) {
@@ -721,7 +724,11 @@ func ParseCreateOpts(ctx context.Context, c *cliconfig.PodmanCommand, runtime *l
 	if c.Bool("init") {
 		initPath := c.String("init-path")
 		if initPath == "" {
-			initPath = runtime.GetConfig().InitPath
+			rtc, err := runtime.GetConfig()
+			if err != nil {
+				return nil, err
+			}
+			initPath = rtc.InitPath
 		}
 		if err := config.AddContainerInitBinary(initPath); err != nil {
 			return nil, err
diff --git a/cmd/podman/sign.go b/cmd/podman/sign.go
index 06418e4a5..75d723514 100644
--- a/cmd/podman/sign.go
+++ b/cmd/podman/sign.go
@@ -108,7 +108,11 @@ func signCmd(c *cliconfig.SignValues) error {
 		}
 
 		// create the signstore file
-		newImage, err := runtime.ImageRuntime().New(getContext(), signimage, runtime.GetConfig().SignaturePolicyPath, "", os.Stderr, nil, image.SigningOptions{SignBy: signby}, false, nil)
+		rtc, err := runtime.GetConfig()
+		if err != nil {
+			return err
+		}
+		newImage, err := runtime.ImageRuntime().New(getContext(), signimage, rtc.SignaturePolicyPath, "", os.Stderr, nil, image.SigningOptions{SignBy: signby}, false, nil)
 		if err != nil {
 			return errors.Wrapf(err, "error pulling image %s", signimage)
 		}
diff --git a/cmd/podman/start.go b/cmd/podman/start.go
index cf406cf66..d17a78268 100644
--- a/cmd/podman/start.go
+++ b/cmd/podman/start.go
@@ -129,7 +129,11 @@ func startCmd(c *cliconfig.StartValues) error {
 				if errors.Cause(err) == libpod.ErrNoSuchCtr {
 					// The container may have been removed
 					// Go looking for an exit file
-					ctrExitCode, err := readExitFile(runtime.GetConfig().TmpDir, ctr.ID())
+					rtc, err := runtime.GetConfig()
+					if err != nil {
+						return err
+					}
+					ctrExitCode, err := readExitFile(rtc.TmpDir, ctr.ID())
 					if err != nil {
 						logrus.Errorf("Cannot get exit code: %v", err)
 						exitCode = 127
diff --git a/cmd/podman/trust_set_show.go b/cmd/podman/trust_set_show.go
index d7a4ea6d6..626d27aae 100644
--- a/cmd/podman/trust_set_show.go
+++ b/cmd/podman/trust_set_show.go
@@ -1,7 +1,6 @@
 package main
 
 import (
-	"encoding/json"
 	"io/ioutil"
 	"os"
 	"sort"