/*
IO helpers — Thin wrappers for filesystem and system operations.

Isolated here so tests can verify logic without needing OS-level mocks.

Copyright (c) Armored Gates LLC. All rights reserved.
*/
package deploy

import (
	"os"
	"os/exec"
)

// readFile reads a file's contents. Wraps os.ReadFile.
func readFile(path string) ([]byte, error) {
	return os.ReadFile(path)
}

// writeFile writes data to a file atomically. Wraps os.WriteFile.
func writeFile(path string, data []byte) error {
	return os.WriteFile(path, data, 0644)
}

// appendFile appends data to a file, creating it if necessary.
func appendFile(path string, data []byte) error {
	f, err := os.OpenFile(path, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
	if err != nil {
		return err
	}
	defer f.Close()
	_, err = f.Write(data)
	return err
}

// fileInfo returns os.FileInfo for the given path.
func fileInfo(path string) (os.FileInfo, error) {
	return os.Stat(path)
}

// runSystemctl runs a systemctl subcommand.
func runSystemctl(action, unit string) error {
	cmd := exec.Command("systemctl", action, unit)
	_, err := cmd.CombinedOutput()
	return err
}