package specgen import ( "strings" "github.com/containers/libpod/pkg/rootless" "github.com/containers/libpod/pkg/util" "github.com/pkg/errors" ) var ( // ErrInvalidSpecConfig describes an error that the given SpecGenerator is invalid ErrInvalidSpecConfig error = errors.New("invalid configuration") // SystemDValues describes the only values that SystemD can be SystemDValues = []string{"true", "false", "always"} // ImageVolumeModeValues describes the only values that ImageVolumeMode can be ImageVolumeModeValues = []string{"ignore", "tmpfs", "anonymous"} ) func exclusiveOptions(opt1, opt2 string) error { return errors.Errorf("%s and %s are mutually exclusive options", opt1, opt2) } // Validate verifies that the given SpecGenerator is valid and satisfies required // input for creating a container. func (s *SpecGenerator) Validate() error { // // ContainerBasicConfig // // Rootfs and Image cannot both populated if len(s.ContainerStorageConfig.Image) > 0 && len(s.ContainerStorageConfig.Rootfs) > 0 { return errors.Wrap(ErrInvalidSpecConfig, "both image and rootfs cannot be simultaneously") } // Cannot set hostname and utsns if len(s.ContainerBasicConfig.Hostname) > 0 && !s.ContainerBasicConfig.UtsNS.IsPrivate() { return errors.Wrap(ErrInvalidSpecConfig, "cannot set hostname when running in the host UTS namespace") } // systemd values must be true, false, or always if len(s.ContainerBasicConfig.Systemd) > 0 && !util.StringInSlice(strings.ToLower(s.ContainerBasicConfig.Systemd), SystemDValues) { return errors.Wrapf(ErrInvalidSpecConfig, "--systemd values must be one of %q", strings.Join(SystemDValues, ", ")) } // // ContainerStorageConfig // // rootfs and image cannot both be set if len(s.ContainerStorageConfig.Image) > 0 && len(s.ContainerStorageConfig.Rootfs) > 0 { return exclusiveOptions("rootfs", "image") } // imagevolumemode must be one of ignore, tmpfs, or anonymous if given if len(s.ContainerStorageConfig.ImageVolumeMode) > 0 && !util.StringInSlice(strings.ToLower(s.ContainerStorageConfig.ImageVolumeMode), ImageVolumeModeValues) { return errors.Errorf("invalid ImageVolumeMode %q, value must be one of %s", s.ContainerStorageConfig.ImageVolumeMode, strings.Join(ImageVolumeModeValues, ",")) } // shmsize conflicts with IPC namespace if s.ContainerStorageConfig.ShmSize != nil && !s.ContainerStorageConfig.IpcNS.IsPrivate() { return errors.New("cannot set shmsize when running in the host IPC Namespace") } // // ContainerSecurityConfig // // groups and privileged are exclusive if len(s.Groups) > 0 && s.Privileged { return exclusiveOptions("Groups", "privileged") } // capadd and privileged are exclusive if len(s.CapAdd) > 0 && s.Privileged { return exclusiveOptions("CapAdd", "privileged") } // apparmor and privileged are exclusive if len(s.ApparmorProfile) > 0 && s.Privileged { return exclusiveOptions("AppArmorProfile", "privileged") } // userns and idmappings conflict if s.UserNS.IsPrivate() && s.IDMappings == nil { return errors.Wrap(ErrInvalidSpecConfig, "IDMappings are required when not creating a User namespace") } // // ContainerCgroupConfig // // // None for now // // ContainerNetworkConfig // // useimageresolveconf conflicts with dnsserver, dnssearch, dnsoption if s.UseImageResolvConf { if len(s.DNSServers) > 0 { return exclusiveOptions("UseImageResolvConf", "DNSServer") } if len(s.DNSSearch) > 0 { return exclusiveOptions("UseImageResolvConf", "DNSSearch") } if len(s.DNSOptions) > 0 { return exclusiveOptions("UseImageResolvConf", "DNSOption") } } // UseImageHosts and HostAdd are exclusive if s.UseImageHosts && len(s.HostAdd) > 0 { return exclusiveOptions("UseImageHosts", "HostAdd") } // TODO the specgen does not appear to handle this? Should it //switch config.Cgroup.Cgroups { //case "disabled": // if addedResources { // return errors.New("cannot specify resource limits when cgroups are disabled is specified") // } // configSpec.Linux.Resources = &spec.LinuxResources{} //case "enabled", "no-conmon", "": // // Do nothing //default: // return errors.New("unrecognized option for cgroups; supported are 'default', 'disabled', 'no-conmon'") //} // Namespaces if err := s.UtsNS.validate(); err != nil { return err } if err := s.IpcNS.validate(); err != nil { return err } if err := s.PidNS.validate(); err != nil { return err } if err := s.CgroupNS.validate(); err != nil { return err } if err := validateUserNS(&s.UserNS); err != nil { return err } // The following are defaults as needed by container creation if len(s.WorkDir) < 1 { s.WorkDir = "/" } // Set defaults if network info is not provided if s.NetNS.NSMode == "" { s.NetNS.NSMode = Bridge if rootless.IsRootless() { s.NetNS.NSMode = Slirp } } if err := validateNetNS(&s.NetNS); err != nil { return err } return nil }