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package container
import (
"fmt"
"path/filepath"
"hakurei.app/check"
)
// Link appends an [Op] that creates a symlink in the container filesystem.
func (f *Ops) Link(target *check.Absolute, linkName string, dereference bool) *Ops {
*f = append(*f, &SymlinkOp{target, linkName, dereference})
return f
}
// SymlinkOp optionally dereferences LinkName and creates a symlink at container path Target.
type SymlinkOp struct {
Target *check.Absolute
// LinkName is an arbitrary uninterpreted pathname.
LinkName string
// Dereference causes LinkName to be dereferenced during early.
Dereference bool
}
func (l *SymlinkOp) Valid() bool { return l != nil && l.Target != nil && l.LinkName != zeroString }
func (l *SymlinkOp) early(_ *setupState, k syscallDispatcher) error {
if l.Dereference {
if !filepath.IsAbs(l.LinkName) {
return check.AbsoluteError(l.LinkName)
}
if name, err := k.readlink(l.LinkName); err != nil {
return err
} else {
l.LinkName = name
}
}
return nil
}
func (l *SymlinkOp) apply(state *setupState, k syscallDispatcher) error {
target := toSysroot(l.Target.String())
if err := k.mkdirAll(filepath.Dir(target), state.ParentPerm); err != nil {
return err
}
return k.symlink(l.LinkName, target)
}
func (l *SymlinkOp) late(*setupState, syscallDispatcher) error { return nil }
func (l *SymlinkOp) Is(op Op) bool {
vl, ok := op.(*SymlinkOp)
return ok && l.Valid() && vl.Valid() &&
l.Target.Is(vl.Target) &&
l.LinkName == vl.LinkName &&
l.Dereference == vl.Dereference
}
func (*SymlinkOp) prefix() (string, bool) { return "creating", true }
func (l *SymlinkOp) String() string {
return fmt.Sprintf("symlink on %q linkname %q", l.Target, l.LinkName)
}
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