Golang SecurityContextConstraintsProvider.CreateContainerSecurityContext方法代碼示例

// assignSecurityContext creates a security context for each container in the pod
// and validates that the sc falls within the scc constraints.  All containers must validate against
// the same scc or is not considered valid.
func assignSecurityContext(provider scc.SecurityContextConstraintsProvider, pod *kapi.Pod, fldPath *field.Path) field.ErrorList {
	generatedSCs := make([]*kapi.SecurityContext, len(pod.Spec.Containers))

	errs := field.ErrorList{}

	psc, err := provider.CreatePodSecurityContext(pod)
	if err != nil {
		errs = append(errs, field.Invalid(field.NewPath("spec", "securityContext"), pod.Spec.SecurityContext, err.Error()))
	}

	// save the original PSC and validate the generated PSC.  Leave the generated PSC
	// set for container generation/validation.  We will reset to original post container
	// validation.
	originalPSC := pod.Spec.SecurityContext
	pod.Spec.SecurityContext = psc
	errs = append(errs, provider.ValidatePodSecurityContext(pod, field.NewPath("spec", "securityContext"))...)

	// Note: this is not changing the original container, we will set container SCs later so long
	// as all containers validated under the same SCC.
	for i, containerCopy := range pod.Spec.Containers {
		// We will determine the effective security context for the container and validate against that
		// since that is how the sc provider will eventually apply settings in the runtime.
		// This results in an SC that is based on the Pod's PSC with the set fields from the container
		// overriding pod level settings.
		containerCopy.SecurityContext = sc.DetermineEffectiveSecurityContext(pod, &containerCopy)

		sc, err := provider.CreateContainerSecurityContext(pod, &containerCopy)
		if err != nil {
			errs = append(errs, field.Invalid(field.NewPath("spec", "containers").Index(i).Child("securityContext"), "", err.Error()))
			continue
		}
		generatedSCs[i] = sc

		containerCopy.SecurityContext = sc
		errs = append(errs, provider.ValidateContainerSecurityContext(pod, &containerCopy, field.NewPath("spec", "containers").Index(i).Child("securityContext"))...)
	}

	if len(errs) > 0 {
		// ensure psc is not mutated if there are errors
		pod.Spec.SecurityContext = originalPSC
		return errs
	}

	// if we've reached this code then we've generated and validated an SC for every container in the
	// pod so let's apply what we generated.  Note: the psc is already applied.
	for i, sc := range generatedSCs {
		pod.Spec.Containers[i].SecurityContext = sc
	}
	return nil
}

// resolveContainerSecurityContext checks the provided container against the provider, returning any
// validation errors encountered on the resulting security context, or the security context that was
// resolved. The SecurityContext field of the container is updated, so ensure that a copy of the original
// container is passed here if you wish to preserve the original input.
func resolveContainerSecurityContext(provider scc.SecurityContextConstraintsProvider, pod *kapi.Pod, container *kapi.Container, path *field.Path) (*kapi.SecurityContext, field.ErrorList) {
	// We will determine the effective security context for the container and validate against that
	// since that is how the sc provider will eventually apply settings in the runtime.
	// This results in an SC that is based on the Pod's PSC with the set fields from the container
	// overriding pod level settings.
	container.SecurityContext = sc.DetermineEffectiveSecurityContext(pod, container)

	csc, err := provider.CreateContainerSecurityContext(pod, container)
	if err != nil {
		return nil, field.ErrorList{field.Invalid(path.Child("securityContext"), "", err.Error())}
	}
	container.SecurityContext = csc
	return csc, provider.ValidateContainerSecurityContext(pod, container, path.Child("securityContext"))
}