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package hst
import (
"encoding/gob"
"path"
"hakurei.app/container/check"
)
func init() { gob.Register(new(FSLink)) }
// FilesystemLink is the type string of a symbolic link.
const FilesystemLink = "link"
// FSLink represents a symlink in the container filesystem.
type FSLink struct {
// Pathname in the container mount namespace.
Target *check.Absolute `json:"dst"`
// Arbitrary linkname value store in the symlink.
Linkname string `json:"linkname"`
// Whether to treat Linkname as an absolute pathname and dereference before
// creating the link.
Dereference bool `json:"dereference,omitempty"`
}
func (l *FSLink) Valid() bool {
if l == nil || l.Target == nil || l.Linkname == "" {
return false
}
return !l.Dereference || path.IsAbs(l.Linkname)
}
func (l *FSLink) Path() *check.Absolute {
if !l.Valid() {
return nil
}
return l.Target
}
func (l *FSLink) Host() []*check.Absolute { return nil }
func (l *FSLink) Apply(z *ApplyState) {
if !l.Valid() {
return
}
z.Link(l.Target, l.Linkname, l.Dereference)
}
func (l *FSLink) String() string {
if !l.Valid() {
return "<invalid>"
}
var dereference string
if l.Dereference {
if l.Target.String() == l.Linkname {
return l.Target.String() + "@"
}
dereference = "*"
}
return l.Target.String() + " -> " + dereference + l.Linkname
}
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