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commands_runmount.go
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commands_runmount.go
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package instructions
import (
"encoding/csv"
"strconv"
"strings"
"github.com/pkg/errors"
)
const MountTypeBind = "bind"
const MountTypeCache = "cache"
const MountTypeTmpfs = "tmpfs"
const MountTypeSecret = "secret"
const MountTypeSSH = "ssh"
var allowedMountTypes = map[string]struct{}{
MountTypeBind: {},
MountTypeCache: {},
MountTypeTmpfs: {},
MountTypeSecret: {},
MountTypeSSH: {},
}
const MountSharingShared = "shared"
const MountSharingPrivate = "private"
const MountSharingLocked = "locked"
var allowedSharingTypes = map[string]struct{}{
MountSharingShared: {},
MountSharingPrivate: {},
MountSharingLocked: {},
}
type mountsKeyT string
var mountsKey = mountsKeyT("dockerfile/run/mounts")
func init() {
parseRunPreHooks = append(parseRunPreHooks, runMountPreHook)
parseRunPostHooks = append(parseRunPostHooks, runMountPostHook)
}
func isValidMountType(s string) bool {
if s == "secret" {
if !isSecretMountsSupported() {
return false
}
}
if s == "ssh" {
if !isSSHMountsSupported() {
return false
}
}
_, ok := allowedMountTypes[s]
return ok
}
func runMountPreHook(cmd *RunCommand, req parseRequest) error {
st := &mountState{}
st.flag = req.flags.AddStrings("mount")
cmd.setExternalValue(mountsKey, st)
return nil
}
func runMountPostHook(cmd *RunCommand, req parseRequest) error {
st := getMountState(cmd)
if st == nil {
return errors.Errorf("no mount state")
}
var mounts []*Mount
for _, str := range st.flag.StringValues {
m, err := parseMount(str)
if err != nil {
return err
}
mounts = append(mounts, m)
}
st.mounts = mounts
return nil
}
func getMountState(cmd *RunCommand) *mountState {
v := cmd.getExternalValue(mountsKey)
if v == nil {
return nil
}
return v.(*mountState)
}
func GetMounts(cmd *RunCommand) []*Mount {
return getMountState(cmd).mounts
}
type mountState struct {
flag *Flag
mounts []*Mount
}
type Mount struct {
Type string
From string
Source string
Target string
ReadOnly bool
CacheID string
CacheSharing string
Required bool
Mode *uint64
UID *uint64
GID *uint64
}
func parseMount(value string) (*Mount, error) {
csvReader := csv.NewReader(strings.NewReader(value))
fields, err := csvReader.Read()
if err != nil {
return nil, errors.Wrap(err, "failed to parse csv mounts")
}
m := &Mount{Type: MountTypeBind}
roAuto := true
for _, field := range fields {
parts := strings.SplitN(field, "=", 2)
key := strings.ToLower(parts[0])
if len(parts) == 1 {
switch key {
case "readonly", "ro":
m.ReadOnly = true
roAuto = false
continue
case "readwrite", "rw":
m.ReadOnly = false
roAuto = false
continue
case "required":
if m.Type == "secret" || m.Type == "ssh" {
m.Required = true
continue
} else {
return nil, errors.Errorf("unexpected key '%s' for mount type '%s'", key, m.Type)
}
}
}
if len(parts) != 2 {
return nil, errors.Errorf("invalid field '%s' must be a key=value pair", field)
}
value := parts[1]
switch key {
case "type":
if !isValidMountType(strings.ToLower(value)) {
return nil, errors.Errorf("unsupported mount type %q", value)
}
m.Type = strings.ToLower(value)
case "from":
m.From = value
case "source", "src":
m.Source = value
case "target", "dst", "destination":
m.Target = value
case "readonly", "ro":
m.ReadOnly, err = strconv.ParseBool(value)
if err != nil {
return nil, errors.Errorf("invalid value for %s: %s", key, value)
}
roAuto = false
case "readwrite", "rw":
rw, err := strconv.ParseBool(value)
if err != nil {
return nil, errors.Errorf("invalid value for %s: %s", key, value)
}
m.ReadOnly = !rw
roAuto = false
case "required":
if m.Type == "secret" || m.Type == "ssh" {
v, err := strconv.ParseBool(value)
if err != nil {
return nil, errors.Errorf("invalid value for %s: %s", key, value)
}
m.Required = v
} else {
return nil, errors.Errorf("unexpected key '%s' for mount type '%s'", key, m.Type)
}
case "id":
m.CacheID = value
case "sharing":
if _, ok := allowedSharingTypes[strings.ToLower(value)]; !ok {
return nil, errors.Errorf("unsupported sharing value %q", value)
}
m.CacheSharing = strings.ToLower(value)
case "mode":
mode, err := strconv.ParseUint(value, 8, 32)
if err != nil {
return nil, errors.Errorf("invalid value %s for mode", value)
}
m.Mode = &mode
case "uid":
uid, err := strconv.ParseUint(value, 10, 32)
if err != nil {
return nil, errors.Errorf("invalid value %s for uid", value)
}
m.UID = &uid
case "gid":
gid, err := strconv.ParseUint(value, 10, 32)
if err != nil {
return nil, errors.Errorf("invalid value %s for gid", value)
}
m.GID = &gid
default:
return nil, errors.Errorf("unexpected key '%s' in '%s'", key, field)
}
}
fileInfoAllowed := m.Type == MountTypeSecret || m.Type == MountTypeSSH || m.Type == MountTypeCache
if m.Mode != nil && !fileInfoAllowed {
return nil, errors.Errorf("mode not allowed for %q type mounts", m.Type)
}
if m.UID != nil && !fileInfoAllowed {
return nil, errors.Errorf("uid not allowed for %q type mounts", m.Type)
}
if m.GID != nil && !fileInfoAllowed {
return nil, errors.Errorf("gid not allowed for %q type mounts", m.Type)
}
if roAuto {
if m.Type == MountTypeCache || m.Type == MountTypeTmpfs {
m.ReadOnly = false
} else {
m.ReadOnly = true
}
}
if m.CacheSharing != "" && m.Type != MountTypeCache {
return nil, errors.Errorf("invalid cache sharing set for %v mount", m.Type)
}
if m.Type == MountTypeSecret {
if m.From != "" {
return nil, errors.Errorf("secret mount should not have a from")
}
if m.CacheSharing != "" {
return nil, errors.Errorf("secret mount should not define sharing")
}
if m.Source == "" && m.Target == "" && m.CacheID == "" {
return nil, errors.Errorf("invalid secret mount. one of source, target required")
}
if m.Source != "" && m.CacheID != "" {
return nil, errors.Errorf("both source and id can't be set")
}
}
return m, nil
}