//go:build !linux

package host

import "os"

// The platform self-update is a root oneshot on a Linux box; the macOS and
// Windows builds exist only so the carlos CLI compiles for workstation use,
// and neither has the syscalls systemapply_unix.go needs — darwin's stdlib
// syscall package has no Openat at all. Both primitives refuse rather than
// pretend: an apply that cannot lock, or that cannot open a path without
// following symlinks, must do nothing at all — and Run tells this refusal
// apart from a lock another apply is holding, so an unsupported platform is
// an error rather than a quiet no-op.

func openBeneath(root string, parts ...string) (*os.File, error) {
	return nil, errSystemUnsupported
}

func flockExclusiveNonblock(f *os.File) error { return errSystemUnsupported }