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package v2 // import "github.com/docker/docker/plugin/v2"
import (
"errors"
"fmt"
"strings"
)
type settable struct {
name string
field string
value string
}
var (
allowedSettableFieldsEnv = []string{"value"}
allowedSettableFieldsArgs = []string{"value"}
allowedSettableFieldsDevices = []string{"path"}
allowedSettableFieldsMounts = []string{"source"}
errMultipleFields = errors.New("multiple fields are settable, one must be specified")
errInvalidFormat = errors.New("invalid format, must be <name>[.<field>][=<value>]")
)
func newSettables(args []string) ([]settable, error) {
sets := make([]settable, 0, len(args))
for _, arg := range args {
set, err := newSettable(arg)
if err != nil {
return nil, err
}
sets = append(sets, set)
}
return sets, nil
}
func newSettable(arg string) (settable, error) {
var set settable
if i := strings.Index(arg, "="); i == 0 {
return set, errInvalidFormat
} else if i < 0 {
set.name = arg
} else {
set.name = arg[:i]
set.value = arg[i+1:]
}
if i := strings.LastIndex(set.name, "."); i > 0 {
set.field = set.name[i+1:]
set.name = arg[:i]
}
return set, nil
}
// prettyName return name.field if there is a field, otherwise name.
func (set *settable) prettyName() string {
if set.field != "" {
return fmt.Sprintf("%s.%s", set.name, set.field)
}
return set.name
}
func (set *settable) isSettable(allowedSettableFields []string, settable []string) (bool, error) {
if set.field == "" {
if len(settable) == 1 {
// if field is not specified and there only one settable, default to it.
set.field = settable[0]
} else if len(settable) > 1 {
return false, errMultipleFields
}
}
isAllowed := false
for _, allowedSettableField := range allowedSettableFields {
if set.field == allowedSettableField {
isAllowed = true
break
}
}
if isAllowed {
for _, settableField := range settable {
if set.field == settableField {
return true, nil
}
}
}
return false, nil
}
func updateSettingsEnv(env *[]string, set *settable) {
for i, e := range *env {
if parts := strings.SplitN(e, "=", 2); parts[0] == set.name {
(*env)[i] = fmt.Sprintf("%s=%s", set.name, set.value)
return
}
}
*env = append(*env, fmt.Sprintf("%s=%s", set.name, set.value))
}
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