package kube import ( "os" "github.com/containers/common/pkg/parse" "github.com/containers/podman/v4/libpod" v1 "github.com/containers/podman/v4/pkg/k8s.io/api/core/v1" "github.com/pkg/errors" "github.com/sirupsen/logrus" ) 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("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 }