Generate Kube should not print default structs

If podman uses Workdir="/" or the workdir specified in the image, it
should not add it to the yaml.
If Podman find environment variables in the image, they should not
get added to the yaml.

If the container or pod do not have changes to SELinux we should not
print seLinuxOpt{}

If the container or pod do not change any dns options the yaml should
not have a dnsOption={}

If the container is not privileged it should not have privileged=false
in the yaml.

Fixes: https://github.com/containers/podman/issues/11995

Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>

1 files changed, 42 insertions, 22 deletions

diff --git a/libpod/kube.go b/libpod/kube.go
index d47f47f1c..02ac8ed98 100644
--- a/libpod/kube.go
+++ b/libpod/kube.go
@@ -332,7 +332,7 @@ func newPodObject(podName string, annotations map[string]string, initCtrs, conta
 		InitContainers: initCtrs,
 		Volumes:        volumes,
 	}
-	if dnsOptions != nil {
+	if dnsOptions != nil && (len(dnsOptions.Nameservers)+len(dnsOptions.Searches)+len(dnsOptions.Options) > 0) {
 		ps.DNSConfig = dnsOptions
 	}
 	p := v1.Pod{
@@ -447,11 +447,6 @@ func containerToV1Container(ctx context.Context, c *Container) (v1.Container, []
 		kubeVolumes = append(kubeVolumes, volumes...)
 	}
 
-	envVariables, err := libpodEnvVarsToKubeEnvVars(c.config.Spec.Process.Env)
-	if err != nil {
-		return kubeContainer, kubeVolumes, nil, annotations, err
-	}
-
 	portmappings, err := c.PortMappings()
 	if err != nil {
 		return kubeContainer, kubeVolumes, nil, annotations, err
@@ -489,15 +484,23 @@ func containerToV1Container(ctx context.Context, c *Container) (v1.Container, []
 		kubeContainer.Command = nil
 	}
 
+	if c.WorkingDir() != "/" && imgData.Config.WorkingDir != c.WorkingDir() {
+		kubeContainer.WorkingDir = c.WorkingDir()
+	}
+
 	if imgData.User == c.User() {
 		kubeSec.RunAsGroup, kubeSec.RunAsUser = nil, nil
 	}
 
-	kubeContainer.WorkingDir = c.WorkingDir()
+	envVariables, err := libpodEnvVarsToKubeEnvVars(c.config.Spec.Process.Env, imgData.Config.Env)
+	if err != nil {
+		return kubeContainer, kubeVolumes, nil, annotations, err
+	}
+	kubeContainer.Env = envVariables
+
 	kubeContainer.Ports = ports
 	// This should not be applicable
 	//container.EnvFromSource =
-	kubeContainer.Env = envVariables
 	kubeContainer.SecurityContext = kubeSec
 	kubeContainer.StdinOnce = false
 	kubeContainer.TTY = c.config.Spec.Process.Terminal
@@ -600,9 +603,14 @@ func ocicniPortMappingToContainerPort(portMappings []types.OCICNIPortMapping) ([
 }
 
 // libpodEnvVarsToKubeEnvVars converts a key=value string slice to []v1.EnvVar
-func libpodEnvVarsToKubeEnvVars(envs []string) ([]v1.EnvVar, error) {
+func libpodEnvVarsToKubeEnvVars(envs []string, imageEnvs []string) ([]v1.EnvVar, error) {
 	defaultEnv := env.DefaultEnvVariables()
 	envVars := make([]v1.EnvVar, 0, len(envs))
+	imageMap := make(map[string]string, len(imageEnvs))
+	for _, ie := range envs {
+		split := strings.SplitN(ie, "=", 2)
+		imageMap[split[0]] = split[1]
+	}
 	for _, e := range envs {
 		split := strings.SplitN(e, "=", 2)
 		if len(split) != 2 {
@@ -611,6 +619,9 @@ func libpodEnvVarsToKubeEnvVars(envs []string) ([]v1.EnvVar, error) {
 		if defaultEnv[split[0]] == split[1] {
 			continue
 		}
+		if imageMap[split[0]] == split[1] {
+			continue
+		}
 		ev := v1.EnvVar{
 			Name:  split[0],
 			Value: split[1],
@@ -808,33 +819,42 @@ func generateKubeSecurityContext(c *Container) (*v1.SecurityContext, error) {
 		capabilities = newCaps
 	}
 
+	sc := v1.SecurityContext{
+		// RunAsNonRoot is an optional parameter; our first implementations should be root only; however
+		// I'm leaving this as a bread-crumb for later
+		//RunAsNonRoot:             &nonRoot,
+	}
+	if capabilities != nil {
+		sc.Capabilities = capabilities
+	}
 	var selinuxOpts v1.SELinuxOptions
 	opts := strings.SplitN(c.config.Spec.Annotations[define.InspectAnnotationLabel], ":", 2)
-	if len(opts) == 2 {
+	switch len(opts) {
+	case 2:
 		switch opts[0] {
 		case "type":
 			selinuxOpts.Type = opts[1]
+			sc.SELinuxOptions = &selinuxOpts
 		case "level":
 			selinuxOpts.Level = opts[1]
+			sc.SELinuxOptions = &selinuxOpts
 		}
-	}
-	if len(opts) == 1 {
+	case 1:
 		if opts[0] == "disable" {
 			selinuxOpts.Type = "spc_t"
+			sc.SELinuxOptions = &selinuxOpts
 		}
 	}
 
-	sc := v1.SecurityContext{
-		Capabilities:   capabilities,
-		Privileged:     &privileged,
-		SELinuxOptions: &selinuxOpts,
-		// RunAsNonRoot is an optional parameter; our first implementations should be root only; however
-		// I'm leaving this as a bread-crumb for later
-		//RunAsNonRoot:             &nonRoot,
-		ReadOnlyRootFilesystem:   &ro,
-		AllowPrivilegeEscalation: &allowPrivEscalation,
+	if !allowPrivEscalation {
+		sc.AllowPrivilegeEscalation = &allowPrivEscalation
+	}
+	if privileged {
+		sc.Privileged = &privileged
+	}
+	if ro {
+		sc.ReadOnlyRootFilesystem = &ro
 	}
-
 	if c.User() != "" {
 		if !c.batched {
 			c.lock.Lock()