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/*
Copyright 2020 The Compose Specification Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package format
import (
"errors"
"fmt"
"strings"
"unicode"
"unicode/utf8"
"github.com/compose-spec/compose-go/v2/types"
)
const endOfSpec = rune(0)
// ParseVolume parses a volume spec without any knowledge of the target platform
func ParseVolume(spec string) (types.ServiceVolumeConfig, error) {
volume := types.ServiceVolumeConfig{}
switch len(spec) {
case 0:
return volume, errors.New("invalid empty volume spec")
case 1, 2:
volume.Target = spec
volume.Type = types.VolumeTypeVolume
return volume, nil
}
var buffer []rune
for _, char := range spec + string(endOfSpec) {
switch {
case isWindowsDrive(buffer, char):
buffer = append(buffer, char)
case char == ':' || char == endOfSpec:
if err := populateFieldFromBuffer(char, buffer, &volume); err != nil {
populateType(&volume)
return volume, fmt.Errorf("invalid spec: %s: %w", spec, err)
}
buffer = nil
default:
buffer = append(buffer, char)
}
}
populateType(&volume)
return volume, nil
}
func isWindowsDrive(buffer []rune, char rune) bool {
return char == ':' && len(buffer) == 1 && unicode.IsLetter(buffer[0])
}
func populateFieldFromBuffer(char rune, buffer []rune, volume *types.ServiceVolumeConfig) error {
strBuffer := string(buffer)
switch {
case len(buffer) == 0:
return errors.New("empty section between colons")
// Anonymous volume
case volume.Source == "" && char == endOfSpec:
volume.Target = strBuffer
return nil
case volume.Source == "":
volume.Source = strBuffer
return nil
case volume.Target == "":
volume.Target = strBuffer
return nil
case char == ':':
return errors.New("too many colons")
}
for _, option := range strings.Split(strBuffer, ",") {
switch option {
case "ro":
volume.ReadOnly = true
case "rw":
volume.ReadOnly = false
case "nocopy":
volume.Volume = &types.ServiceVolumeVolume{NoCopy: true}
default:
if isBindOption(option) {
setBindOption(volume, option)
}
// ignore unknown options FIXME why not report an error here?
}
}
return nil
}
var Propagations = []string{
types.PropagationRPrivate,
types.PropagationPrivate,
types.PropagationRShared,
types.PropagationShared,
types.PropagationRSlave,
types.PropagationSlave,
}
type setBindOptionFunc func(bind *types.ServiceVolumeBind, option string)
var bindOptions = map[string]setBindOptionFunc{
types.PropagationRPrivate: setBindPropagation,
types.PropagationPrivate: setBindPropagation,
types.PropagationRShared: setBindPropagation,
types.PropagationShared: setBindPropagation,
types.PropagationRSlave: setBindPropagation,
types.PropagationSlave: setBindPropagation,
types.SELinuxShared: setBindSELinux,
types.SELinuxPrivate: setBindSELinux,
}
func setBindPropagation(bind *types.ServiceVolumeBind, option string) {
bind.Propagation = option
}
func setBindSELinux(bind *types.ServiceVolumeBind, option string) {
bind.SELinux = option
}
func isBindOption(option string) bool {
_, ok := bindOptions[option]
return ok
}
func setBindOption(volume *types.ServiceVolumeConfig, option string) {
if volume.Bind == nil {
volume.Bind = &types.ServiceVolumeBind{}
}
bindOptions[option](volume.Bind, option)
}
func populateType(volume *types.ServiceVolumeConfig) {
if isFilePath(volume.Source) {
volume.Type = types.VolumeTypeBind
if volume.Bind == nil {
volume.Bind = &types.ServiceVolumeBind{}
}
// For backward compatibility with docker-compose legacy, using short notation involves
// bind will create missing host path
volume.Bind.CreateHostPath = true
} else {
volume.Type = types.VolumeTypeVolume
if volume.Volume == nil {
volume.Volume = &types.ServiceVolumeVolume{}
}
}
}
func isFilePath(source string) bool {
if source == "" {
return false
}
switch source[0] {
case '.', '/', '~':
return true
}
// windows named pipes
if strings.HasPrefix(source, `\\`) {
return true
}
first, nextIndex := utf8.DecodeRuneInString(source)
if len(source) <= nextIndex {
return false
}
return isWindowsDrive([]rune{first}, rune(source[nextIndex]))
}
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