Merge pull request #2603 from mheon/misc_pod_fixes

Misc pod fixes

libpod/container_internal_linux.go

@@ -665,7 +665,9 @@ func (c *Container) makeBindMounts() error {
 
 	if !netDisabled {
 		// If /etc/resolv.conf and /etc/hosts exist, delete them so we
-		// will recreate
+		// will recreate. Only do this if we aren't sharing them with
+		// another container.
+		if c.config.NetNsCtr == "" {
 			if path, ok := c.state.BindMounts["/etc/resolv.conf"]; ok {
 				if err := os.Remove(path); err != nil && !os.IsNotExist(err) {
 					return errors.Wrapf(err, "error removing container %s resolv.conf", c.ID())
@@ -678,6 +680,7 @@ func (c *Container) makeBindMounts() error {
 				}
 				delete(c.state.BindMounts, "/etc/hosts")
 			}
+		}
 
 		if c.config.NetNsCtr != "" {
 			// We share a net namespace

libpod/runtime_pod_infra_linux.go

@@ -12,6 +12,7 @@ import (
 	spec "github.com/opencontainers/runtime-spec/specs-go"
 	"github.com/opencontainers/runtime-tools/generate"
 	"github.com/pkg/errors"
+	"github.com/sirupsen/logrus"
 )
 
 const (
@@ -31,9 +32,27 @@ func (r *Runtime) makeInfraContainer(ctx context.Context, p *Pod, imgName, imgID
 	isRootless := rootless.IsRootless()
 
 	entryCmd := []string{r.config.InfraCommand}
+	// I've seen circumstances where config is being passed as nil.
+	// Let's err on the side of safety and make sure it's safe to use.
+	if config != nil {
+		setEntrypoint := false
 		// default to entrypoint in image if there is one
 		if len(config.Entrypoint) > 0 {
 			entryCmd = config.Entrypoint
+			setEntrypoint = true
+		}
+		if len(config.Cmd) > 0 {
+			// We can't use the default pause command, since we're
+			// sourcing from the image. If we didn't already set an
+			// entrypoint, set one now.
+			if !setEntrypoint {
+				// Use the Docker default "/bin/sh -c"
+				// entrypoint, as we're overriding command.
+				// If an image doesn't want this, it can
+				// override entrypoint too.
+				entryCmd = []string{"/bin/sh", "-c"}
+			}
+			entryCmd = append(entryCmd, config.Cmd...)
 		}
 		if len(config.Env) > 0 {
 			for _, nameValPair := range config.Env {
@@ -44,10 +63,13 @@ func (r *Runtime) makeInfraContainer(ctx context.Context, p *Pod, imgName, imgID
 				g.AddProcessEnv(nameValSlice[0], nameValSlice[1])
 			}
 		}
+	}
 
 	g.SetRootReadonly(true)
 	g.SetProcessArgs(entryCmd)
 
+	logrus.Debugf("Using %q as infra container entrypoint", entryCmd)
+
 	if isRootless {
 		g.RemoveMount("/dev/pts")
 		devPts := spec.Mount{
@@ -97,5 +119,5 @@ func (r *Runtime) createInfraContainer(ctx context.Context, p *Pod) (*Container,
 	imageName := newImage.Names()[0]
 	imageID := data.ID
 
-	return r.makeInfraContainer(ctx, p, imageName, imageID, newImage.Config)
+	return r.makeInfraContainer(ctx, p, imageName, imageID, data.Config)
 }