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package kube
import (
"os"
"github.com/containers/common/pkg/parse"
"github.com/containers/podman/v4/libpod"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
v1 "k8s.io/api/core/v1"
)
const (
// https://kubernetes.io/docs/concepts/storage/volumes/#hostpath
kubeDirectoryPermission = 0755
// https://kubernetes.io/docs/concepts/storage/volumes/#hostpath
kubeFilePermission = 0644
)
// nolint:golint
type KubeVolumeType int
const (
KubeVolumeTypeBindMount KubeVolumeType = iota
KubeVolumeTypeNamed KubeVolumeType = iota
KubeVolumeTypeConfigMap KubeVolumeType = iota
)
// nolint:golint
type KubeVolume struct {
// Type of volume to create
Type KubeVolumeType
// Path for bind mount or volume name for named volume
Source string
// Items to add to a named volume created where the key is the file name and the value is the data
// This is only used when there are volumes in the yaml that refer to a configmap
// Example: if configmap has data "SPECIAL_LEVEL: very" then the file name is "SPECIAL_LEVEL" and the
// data in that file is "very".
Items map[string]string
// If the volume is optional, we can move on if it is not found
// Only used when there are volumes in a yaml that refer to a configmap
Optional bool
}
// Create a KubeVolume from an HostPathVolumeSource
func VolumeFromHostPath(hostPath *v1.HostPathVolumeSource) (*KubeVolume, error) {
if hostPath.Type != nil {
switch *hostPath.Type {
case v1.HostPathDirectoryOrCreate:
if _, err := os.Stat(hostPath.Path); os.IsNotExist(err) {
if err := os.Mkdir(hostPath.Path, kubeDirectoryPermission); err != nil {
return nil, err
}
}
// Label a newly created volume
if err := libpod.LabelVolumePath(hostPath.Path); err != nil {
return nil, errors.Wrapf(err, "error giving %s a label", hostPath.Path)
}
case v1.HostPathFileOrCreate:
if _, err := os.Stat(hostPath.Path); os.IsNotExist(err) {
f, err := os.OpenFile(hostPath.Path, os.O_RDONLY|os.O_CREATE, kubeFilePermission)
if err != nil {
return nil, errors.Wrap(err, "error creating HostPath")
}
if err := f.Close(); err != nil {
logrus.Warnf("Error in closing newly created HostPath file: %v", err)
}
}
// unconditionally label a newly created volume
if err := libpod.LabelVolumePath(hostPath.Path); err != nil {
return nil, errors.Wrapf(err, "error giving %s a label", hostPath.Path)
}
case v1.HostPathSocket:
st, err := os.Stat(hostPath.Path)
if err != nil {
return nil, errors.Wrap(err, "error checking HostPathSocket")
}
if st.Mode()&os.ModeSocket != os.ModeSocket {
return nil, errors.Errorf("error checking HostPathSocket: path %s is not a socket", hostPath.Path)
}
case v1.HostPathDirectory:
case v1.HostPathFile:
case v1.HostPathUnset:
// do nothing here because we will verify the path exists in validateVolumeHostDir
break
default:
return nil, errors.Errorf("Invalid HostPath type %v", hostPath.Type)
}
}
if err := parse.ValidateVolumeHostDir(hostPath.Path); err != nil {
return nil, errors.Wrapf(err, "error in parsing HostPath in YAML")
}
return &KubeVolume{
Type: KubeVolumeTypeBindMount,
Source: hostPath.Path,
}, nil
}
// Create a KubeVolume from a PersistentVolumeClaimVolumeSource
func VolumeFromPersistentVolumeClaim(claim *v1.PersistentVolumeClaimVolumeSource) (*KubeVolume, error) {
return &KubeVolume{
Type: KubeVolumeTypeNamed,
Source: claim.ClaimName,
}, nil
}
func VolumeFromConfigMap(configMapVolumeSource *v1.ConfigMapVolumeSource, configMaps []v1.ConfigMap) (*KubeVolume, error) {
var configMap *v1.ConfigMap
kv := &KubeVolume{Type: KubeVolumeTypeConfigMap, Items: map[string]string{}}
for _, cm := range configMaps {
if cm.Name == configMapVolumeSource.Name {
matchedCM := cm
// Set the source to the config map name
kv.Source = cm.Name
configMap = &matchedCM
break
}
}
if configMap == nil {
// If the volumeSource was optional, move on even if a matching configmap wasn't found
if configMapVolumeSource.Optional != nil && *configMapVolumeSource.Optional {
kv.Source = configMapVolumeSource.Name
kv.Optional = *configMapVolumeSource.Optional
return kv, nil
}
return nil, errors.Errorf("no such ConfigMap %q", configMapVolumeSource.Name)
}
// If there are Items specified in the volumeSource, that overwrites the Data from the configmap
if len(configMapVolumeSource.Items) > 0 {
for _, item := range configMapVolumeSource.Items {
if val, ok := configMap.Data[item.Key]; ok {
kv.Items[item.Path] = val
}
}
} else {
for k, v := range configMap.Data {
kv.Items[k] = v
}
}
return kv, nil
}
// Create a KubeVolume from one of the supported VolumeSource
func VolumeFromSource(volumeSource v1.VolumeSource, configMaps []v1.ConfigMap) (*KubeVolume, error) {
switch {
case volumeSource.HostPath != nil:
return VolumeFromHostPath(volumeSource.HostPath)
case volumeSource.PersistentVolumeClaim != nil:
return VolumeFromPersistentVolumeClaim(volumeSource.PersistentVolumeClaim)
case volumeSource.ConfigMap != nil:
return VolumeFromConfigMap(volumeSource.ConfigMap, configMaps)
default:
return nil, errors.Errorf("HostPath, ConfigMap, and PersistentVolumeClaim are currently the only supported VolumeSource")
}
}
// Create a map of volume name to KubeVolume
func InitializeVolumes(specVolumes []v1.Volume, configMaps []v1.ConfigMap) (map[string]*KubeVolume, error) {
volumes := make(map[string]*KubeVolume)
for _, specVolume := range specVolumes {
volume, err := VolumeFromSource(specVolume.VolumeSource, configMaps)
if err != nil {
return nil, errors.Wrapf(err, "failed to create volume %q", specVolume.Name)
}
volumes[specVolume.Name] = volume
}
return volumes, nil
}
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