//go:build linux

// SPDX-License-Identifier: AGPL-3.0-only

package deploy

import (
	"os"
	"syscall"
)

type fileIdentity struct {
	mode     os.FileMode
	uid, gid int
	owned    bool
}

func identityFor(info os.FileInfo, fallback os.FileMode) fileIdentity {
	identity := fileIdentity{mode: fallback}
	if info == nil {
		return identity
	}
	identity.mode = info.Mode().Perm()
	if stat, ok := info.Sys().(*syscall.Stat_t); ok {
		identity.uid = int(stat.Uid)
		identity.gid = int(stat.Gid)
		identity.owned = true
	}
	return identity
}
func applyIdentity(file *os.File, identity fileIdentity) error {
	if identity.owned {
		if err := file.Chown(identity.uid, identity.gid); err != nil {
			return err
		}
	}
	return file.Chmod(identity.mode)
}