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use chrono::Local;
use clap::Parser;
use duct::cmd;
use regex::Regex;
use serde::Deserialize;
use std::{
error::Error,
fs::{self, File},
io::{BufRead, BufReader},
path::{Path, PathBuf},
process::Command,
};
/// Backup-Tool mit inkrementeller Sicherung und Rotation
#[derive(Parser, Debug)]
#[command(author, version, about, long_about = None)]
struct Args {
/// Pfad zur Konfigurationsdatei (JSON)
#[arg(short, long)]
config: PathBuf,
/// Ausführliche Ausgabe
#[arg(short, long, default_value_t = false)]
verbose: bool,
}
#[derive(Debug, Deserialize)]
struct Config {
backup_dir: String,
rotate_dir: String,
timestamp_file: String,
source_file: String,
exclude_file: String,
cycles: Option<u32>,
zstd_level: Option<u8>,
zstd_threads: Option<u8>,
skip_db: Option<bool>
}
fn read_lines<P: AsRef<Path>>(path: P) -> Result<Vec<String>, Box<dyn Error>> {
let file = File::open(path)?;
let reader = BufReader::new(file);
Ok(reader.lines().filter_map(Result::ok).filter(|l| !l.trim().is_empty()).collect())
}
fn get_backup_number(backup_dir: &Path) -> Result<u32, Box<dyn Error>> {
let mut highest = 0;
let pattern = Regex::new(r"backup-(\d{2})\.tar\.zst")?;
for entry in fs::read_dir(backup_dir)? {
let path = entry?.path();
if let Some(fname) = path.file_name().and_then(|n| n.to_str()) {
if let Some(caps) = pattern.captures(fname) {
if let Ok(num) = caps[1].parse::<u32>() {
if num > highest {
highest = num;
}
}
}
}
}
Ok(highest)
}
fn main() -> Result<(), Box<dyn Error>> {
let args = Args::parse();
let config_str = fs::read_to_string(&args.config)?;
let config: Config = serde_json::from_str(&config_str)?;
let backup_dir = Path::new(&config.backup_dir);
let rotate_dir = Path::new(&config.rotate_dir);
let timestamp_file = Path::new(&config.timestamp_file);
let source_list = read_lines(&config.source_file)?;
let exclude_list = read_lines(&config.exclude_file)?;
let zstd_level = config.zstd_level.unwrap_or(9).clamp(1, 19);
let zstd_threads = config.zstd_threads.unwrap_or(1);
let zstd_cmd = format!("zstd -{} -T{}", zstd_level, zstd_threads);
fs::create_dir_all(backup_dir)?;
let mut source_paths: Vec<String> = vec![];
for s in &source_list {
if Path::new(s).exists() {
source_paths.push(s.clone());
} else if args.verbose {
eprintln!("WARNING: '{}' existiert nicht", s);
}
}
let mut exclude_args: Vec<String> = vec![];
for e in &exclude_list {
if Path::new(e).exists() {
exclude_args.push(format!("--exclude={}", e));
} else if args.verbose {
eprintln!("WARNING: '{}' existiert nicht", e);
}
}
let mut backup_nr = get_backup_number(backup_dir)? + 1;
if backup_nr > config.cycles.unwrap_or(30) {
backup_nr = 1;
let now = Local::now();
let rotate_subdir = rotate_dir.join(format!("{}-{}", now.format("%Y-%m-%d"), now.format("%H-%M-%S-%3f")));
fs::create_dir_all(&rotate_subdir)?;
for entry in fs::read_dir(backup_dir)? {
let entry = entry?;
let dest = rotate_subdir.join(entry.file_name());
fs::rename(entry.path(), dest)?;
}
if args.verbose {
println!("INFO: Backup-Rotation durchgeführt");
}
// Nur wenn skip_db != true
if config.skip_db.unwrap_or(false) == false {
// Dump 1
let dump1 = rotate_subdir.join("backup_mastodon-db-1.sql.zst");
cmd!("docker", "exec", "mastodon-db-1", "pg_dumpall", "-U", "postgres")
.pipe(cmd!("sh", "-c", &zstd_cmd))
.stdout_file(File::create(dump1)?)
.run()?;
// Dump 2
let dump2 = rotate_subdir.join("backup_db.sql.zst");
cmd!("pg_dumpall", "-U", "postgres")
.pipe(cmd!("sh", "-c", &zstd_cmd))
.stdout_file(File::create(dump2)?)
.run()?;
if args.verbose {
println!("INFO: Datenbank-Dumps gespeichert");
}
} else if args.verbose {
println!("INFO: Datenbank-Dumps wurden übersprungen (skip_db_dumps=true)");
}
}
let backup_filename = format!("backup-{:02}.tar.zst", backup_nr);
let backup_path = backup_dir.join(&backup_filename);
let mut tar_cmd = Command::new("tar");
for excl in &exclude_args {
tar_cmd.arg(excl);
}
tar_cmd
.arg("-cvp")
.arg("-I")
.arg(zstd_cmd)
.arg("-f")
.arg(&backup_path)
.arg("-g")
.arg(timestamp_file);
for src in &source_paths {
tar_cmd.arg(src);
}
let tar_status = tar_cmd.status()?;
// Log-Dateien behandeln
cmd!("find", "/var/log", "-type", "f", "-name", "*.log", "-exec", "truncate", "-s", "0", "{}", ";").run()?;
cmd!("find", "/var/log", "-type", "f", "-name", "*.gz", "-exec", "rm", "-f", "{}", ";").run()?;
if !tar_status.success() {
return Err("ERROR: Fehler beim Erstellen des Tar-Backups".into());
}
println!("INFO: Backup erfolgreich als: {}", backup_path.display());
Ok(())
}
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