package opts // import "github.com/docker/docker/opts" import ( "fmt" "net" "path" "regexp" "strings" units "github.com/docker/go-units" ) var ( alphaRegexp = regexp.MustCompile(`[a-zA-Z]`) domainRegexp = regexp.MustCompile(`^(:?(:?[a-zA-Z0-9]|(:?[a-zA-Z0-9][a-zA-Z0-9\-]*[a-zA-Z0-9]))(:?\.(:?[a-zA-Z0-9]|(:?[a-zA-Z0-9][a-zA-Z0-9\-]*[a-zA-Z0-9])))*)\.?\s*$`) ) // ListOpts holds a list of values and a validation function. type ListOpts struct { values *[]string validator ValidatorFctType } // NewListOpts creates a new ListOpts with the specified validator. func NewListOpts(validator ValidatorFctType) ListOpts { var values []string return *NewListOptsRef(&values, validator) } // NewListOptsRef creates a new ListOpts with the specified values and validator. func NewListOptsRef(values *[]string, validator ValidatorFctType) *ListOpts { return &ListOpts{ values: values, validator: validator, } } func (opts *ListOpts) String() string { if len(*opts.values) == 0 { return "" } return fmt.Sprintf("%v", *opts.values) } // Set validates if needed the input value and adds it to the // internal slice. func (opts *ListOpts) Set(value string) error { if opts.validator != nil { v, err := opts.validator(value) if err != nil { return err } value = v } *opts.values = append(*opts.values, value) return nil } // Delete removes the specified element from the slice. func (opts *ListOpts) Delete(key string) { for i, k := range *opts.values { if k == key { *opts.values = append((*opts.values)[:i], (*opts.values)[i+1:]...) return } } } // GetMap returns the content of values in a map in order to avoid // duplicates. func (opts *ListOpts) GetMap() map[string]struct{} { ret := make(map[string]struct{}) for _, k := range *opts.values { ret[k] = struct{}{} } return ret } // GetAll returns the values of slice. func (opts *ListOpts) GetAll() []string { return *opts.values } // GetAllOrEmpty returns the values of the slice // or an empty slice when there are no values. func (opts *ListOpts) GetAllOrEmpty() []string { v := *opts.values if v == nil { return make([]string, 0) } return v } // Get checks the existence of the specified key. func (opts *ListOpts) Get(key string) bool { for _, k := range *opts.values { if k == key { return true } } return false } // Len returns the amount of element in the slice. func (opts *ListOpts) Len() int { return len(*opts.values) } // Type returns a string name for this Option type func (opts *ListOpts) Type() string { return "list" } // WithValidator returns the ListOpts with validator set. func (opts *ListOpts) WithValidator(validator ValidatorFctType) *ListOpts { opts.validator = validator return opts } // NamedOption is an interface that list and map options // with names implement. type NamedOption interface { Name() string } // NamedListOpts is a ListOpts with a configuration name. // This struct is useful to keep reference to the assigned // field name in the internal configuration struct. type NamedListOpts struct { name string ListOpts } var _ NamedOption = &NamedListOpts{} // NewNamedListOptsRef creates a reference to a new NamedListOpts struct. func NewNamedListOptsRef(name string, values *[]string, validator ValidatorFctType) *NamedListOpts { return &NamedListOpts{ name: name, ListOpts: *NewListOptsRef(values, validator), } } // Name returns the name of the NamedListOpts in the configuration. func (o *NamedListOpts) Name() string { return o.name } // MapOpts holds a map of values and a validation function. type MapOpts struct { values map[string]string validator ValidatorFctType } // Set validates if needed the input value and add it to the // internal map, by splitting on '='. func (opts *MapOpts) Set(value string) error { if opts.validator != nil { v, err := opts.validator(value) if err != nil { return err } value = v } vals := strings.SplitN(value, "=", 2) if len(vals) == 1 { (opts.values)[vals[0]] = "" } else { (opts.values)[vals[0]] = vals[1] } return nil } // GetAll returns the values of MapOpts as a map. func (opts *MapOpts) GetAll() map[string]string { return opts.values } func (opts *MapOpts) String() string { return fmt.Sprintf("%v", opts.values) } // Type returns a string name for this Option type func (opts *MapOpts) Type() string { return "map" } // NewMapOpts creates a new MapOpts with the specified map of values and a validator. func NewMapOpts(values map[string]string, validator ValidatorFctType) *MapOpts { if values == nil { values = make(map[string]string) } return &MapOpts{ values: values, validator: validator, } } // NamedMapOpts is a MapOpts struct with a configuration name. // This struct is useful to keep reference to the assigned // field name in the internal configuration struct. type NamedMapOpts struct { name string MapOpts } var _ NamedOption = &NamedMapOpts{} // NewNamedMapOpts creates a reference to a new NamedMapOpts struct. func NewNamedMapOpts(name string, values map[string]string, validator ValidatorFctType) *NamedMapOpts { return &NamedMapOpts{ name: name, MapOpts: *NewMapOpts(values, validator), } } // Name returns the name of the NamedMapOpts in the configuration. func (o *NamedMapOpts) Name() string { return o.name } // ValidatorFctType defines a validator function that returns a validated string and/or an error. type ValidatorFctType func(val string) (string, error) // ValidatorFctListType defines a validator function that returns a validated list of string and/or an error type ValidatorFctListType func(val string) ([]string, error) // ValidateIPAddress validates an Ip address. func ValidateIPAddress(val string) (string, error) { var ip = net.ParseIP(strings.TrimSpace(val)) if ip != nil { return ip.String(), nil } return "", fmt.Errorf("%s is not an ip address", val) } // ValidateDNSSearch validates domain for resolvconf search configuration. // A zero length domain is represented by a dot (.). func ValidateDNSSearch(val string) (string, error) { if val = strings.Trim(val, " "); val == "." { return val, nil } return validateDomain(val) } func validateDomain(val string) (string, error) { if alphaRegexp.FindString(val) == "" { return "", fmt.Errorf("%s is not a valid domain", val) } ns := domainRegexp.FindSubmatch([]byte(val)) if len(ns) > 0 && len(ns[1]) < 255 { return string(ns[1]), nil } return "", fmt.Errorf("%s is not a valid domain", val) } // ValidateLabel validates that the specified string is a valid label, // it does not use the reserved namespaces com.docker.*, io.docker.*, org.dockerproject.* // and returns it. // Labels are in the form on key=value. func ValidateLabel(val string) (string, error) { if strings.Count(val, "=") < 1 { return "", fmt.Errorf("bad attribute format: %s", val) } lowered := strings.ToLower(val) if strings.HasPrefix(lowered, "com.docker.") || strings.HasPrefix(lowered, "io.docker.") || strings.HasPrefix(lowered, "org.dockerproject.") { return "", fmt.Errorf( "label %s is not allowed: the namespaces com.docker.*, io.docker.*, and org.dockerproject.* are reserved for internal use", val) } return val, nil } // ValidateSingleGenericResource validates that a single entry in the // generic resource list is valid. // i.e 'GPU=UID1' is valid however 'GPU:UID1' or 'UID1' isn't func ValidateSingleGenericResource(val string) (string, error) { if strings.Count(val, "=") < 1 { return "", fmt.Errorf("invalid node-generic-resource format `%s` expected `name=value`", val) } return val, nil } // ParseLink parses and validates the specified string as a link format (name:alias) func ParseLink(val string) (string, string, error) { if val == "" { return "", "", fmt.Errorf("empty string specified for links") } arr := strings.Split(val, ":") if len(arr) > 2 { return "", "", fmt.Errorf("bad format for links: %s", val) } if len(arr) == 1 { return val, val, nil } // This is kept because we can actually get a HostConfig with links // from an already created container and the format is not `foo:bar` // but `/foo:/c1/bar` if strings.HasPrefix(arr[0], "/") { _, alias := path.Split(arr[1]) return arr[0][1:], alias, nil } return arr[0], arr[1], nil } // MemBytes is a type for human readable memory bytes (like 128M, 2g, etc) type MemBytes int64 // String returns the string format of the human readable memory bytes func (m *MemBytes) String() string { // NOTE: In spf13/pflag/flag.go, "0" is considered as "zero value" while "0 B" is not. // We return "0" in case value is 0 here so that the default value is hidden. // (Sometimes "default 0 B" is actually misleading) if m.Value() != 0 { return units.BytesSize(float64(m.Value())) } return "0" } // Set sets the value of the MemBytes by passing a string func (m *MemBytes) Set(value string) error { val, err := units.RAMInBytes(value) *m = MemBytes(val) return err } // Type returns the type func (m *MemBytes) Type() string { return "bytes" } // Value returns the value in int64 func (m *MemBytes) Value() int64 { return int64(*m) } // UnmarshalJSON is the customized unmarshaler for MemBytes func (m *MemBytes) UnmarshalJSON(s []byte) error { if len(s) <= 2 || s[0] != '"' || s[len(s)-1] != '"' { return fmt.Errorf("invalid size: %q", s) } val, err := units.RAMInBytes(string(s[1 : len(s)-1])) *m = MemBytes(val) return err }