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|
package hst
import (
"encoding/gob"
"strings"
"hakurei.app/container"
)
func init() { gob.Register(new(FSBind)) }
// FilesystemBind is the [FilesystemConfig.Type] name of a bind mount point.
const FilesystemBind = "bind"
// FSBind represents a host to container bind mount.
type FSBind struct {
// mount point in container, same as src if empty
Target *container.Absolute `json:"dst,omitempty"`
// host filesystem path to make available to the container
Source *container.Absolute `json:"src"`
// do not mount filesystem read-only
Write bool `json:"write,omitempty"`
// do not disable device files, implies Write
Device bool `json:"dev,omitempty"`
// skip this mount point if the host path does not exist
Optional bool `json:"optional,omitempty"`
// enable autoroot behaviour;
// this requires Target to be [container.AbsFHSRoot].
AutoRoot bool `json:"autoroot,omitempty"`
}
func (b *FSBind) Valid() bool {
if b == nil || b.Source == nil {
return false
}
if b.AutoRoot && (b.Target == nil || b.Target.String() != container.FHSRoot) {
return false
}
return true
}
func (b *FSBind) Path() *container.Absolute {
if !b.Valid() {
return nil
}
if b.Target == nil {
return b.Source
}
return b.Target
}
func (b *FSBind) Host() []*container.Absolute {
if !b.Valid() {
return nil
}
return []*container.Absolute{b.Source}
}
func (b *FSBind) Apply(ops *container.Ops) {
if !b.Valid() {
return
}
target := b.Target
if target == nil {
target = b.Source
}
var flags int
if b.Write {
flags |= container.BindWritable
}
if b.Device {
flags |= container.BindDevice | container.BindWritable
}
if b.Optional {
flags |= container.BindOptional
}
if !b.AutoRoot {
ops.Bind(b.Source, target, flags)
} else {
ops.Root(b.Source, flags)
}
}
func (b *FSBind) String() string {
if !b.Valid() {
return "<invalid>"
}
var flagSym string
if b.Device {
flagSym = "d"
} else if b.Write {
flagSym = "w"
}
if b.AutoRoot {
prefix := "autoroot"
if flagSym != "" {
prefix += ":" + flagSym
}
if b.Source.String() != container.FHSRoot {
return prefix + ":" + b.Source.String()
}
return prefix
}
g := 4 + len(b.Source.String())
if b.Target != nil {
g += len(b.Target.String())
}
expr := new(strings.Builder)
expr.Grow(g)
expr.WriteString(flagSym)
if !b.Optional {
expr.WriteString("*")
} else {
expr.WriteString("+")
}
expr.WriteString(b.Source.String())
if b.Target != nil {
expr.WriteString(":" + b.Target.String())
}
return expr.String()
}
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