src
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6
.gitignore
vendored
6
.gitignore
vendored
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@ -12,3 +12,9 @@ Cargo.lock
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# MSVC Windows builds of rustc generate these, which store debugging information
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*.pdb
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# user script
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/build
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336
src/main.rs
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336
src/main.rs
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@ -0,0 +1,336 @@
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extern crate shlex;
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extern crate structopt;
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use std::io::{Read,Write};
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use std::path::{Path,PathBuf};
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use std::collections::HashMap;
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use std::os::linux::fs::MetadataExt as MetadataExtLinux;
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use crate::structopt::StructOpt;
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fn main() -> Result<(), Box<dyn std::error::Error>> {
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let (run_paths, cfg) = process_args();
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for paths in run_paths {
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run(paths, &cfg)?;
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}
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Ok(())
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}
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struct Config {
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dry_run: bool,
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min_size: u64,
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verbosity: i8,
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no_brace_output: bool
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}
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#[derive(StructOpt)]
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#[structopt(
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about="Hardlink duplicate files recursively",
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usage=concat!(env!("CARGO_PKG_NAME"), " [OPTION]... TARGET... [';' TARGET...]")
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)]
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struct CLIArguments {
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#[structopt(short, long, parse(from_occurrences),
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help="Increase verbosity")]
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verbose: i8,
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#[structopt(short, long, parse(from_occurrences),
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help="Decrease verbosity")]
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quiet: i8,
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#[structopt(long,
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help="Disable brace notation for output\n Ex: /home/user/{dir,backup}/file")]
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no_brace_output: bool,
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#[structopt(long,
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help="Perform no operations on the filesystem")]
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dry_run: bool,
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#[structopt(short, long, value_name="VALUE",
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help="Minimum file size to be considered for hardlinking\nNever goes below 1 (the default)")]
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min_size: u64,
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#[structopt(value_name="TARGET",
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help="Target files and directories (recursive)\nEach ';' denotes a new set of targets\n Each set of targets are separate from all other sets\n All targets must be on the same device\nAll symlinks are ignored")]
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targets: Vec<String>,
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}
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impl Default for CLIArguments {
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fn default() -> Self {
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Self {
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verbose: 0,
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quiet: 0,
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no_brace_output: false,
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dry_run: false,
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min_size: 1,
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targets: Vec::new()
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}
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}
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}
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fn process_args() -> (Vec<Vec<PathBuf>>, Config) {
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let args = CLIArguments::from_args();
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let run_targets: Vec<Vec<String>> = split_vec(&args.targets, ";");
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let run_paths: Vec<Vec<PathBuf>> = run_targets.iter().enumerate().map(
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|(i,spaths)| {
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if spaths.len() < 2 {
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eprintln!("Not enough targets for run {} (args: {})", i+1, shlex::join(spaths.iter().map(|string| string.as_str())));
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std::process::exit(1);
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}
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spaths.iter().map(
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|spath| Path::new(spath).canonicalize().unwrap_or_else(
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|_| {
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eprintln!("Failed to retrieve absolute path for {}", shlex::quote(spath));
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std::process::exit(1);
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}
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)
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).collect()
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}
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).collect();
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for paths in &run_paths {
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assert_all_same_device(paths);
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}
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(run_paths, Config {
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min_size: std::cmp::max(1, args.min_size),
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no_brace_output: args.no_brace_output,
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dry_run: args.dry_run,
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verbosity: args.verbose - args.quiet
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})
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}
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/// minimum length of slice = 2
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fn assert_all_same_device(paths: &[PathBuf]) {
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let first_device_id = if let Ok(metadata) = std::fs::metadata(&paths[0]) {
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metadata.st_dev()
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} else {
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eprintln!("Failed to retrive device id for {}", shlex::quote(&paths[0].to_string_lossy()));
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std::process::exit(1);
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};
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for path in &paths[1..] {
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if let Ok(metadata) = std::fs::metadata(path) {
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if metadata.st_dev() != first_device_id {
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eprintln!("Device ids must all be the same; got different for: {}", shlex::quote(&path.to_string_lossy()));
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std::process::exit(1);
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}
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} else {
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eprintln!("Failed to retrive device id for {}", shlex::quote(&path.to_string_lossy()));
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std::process::exit(1);
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}
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}
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}
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/// perform a full run with pre-processed inputs
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fn run(paths: Vec<PathBuf>, cfg: &Config) -> Result<(), Box<dyn std::error::Error>> {
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let mut registry: HashMap<u64, Vec<PathBuf>> = HashMap::new();
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for path in paths {
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register(path.to_path_buf(), &mut registry, cfg);
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}
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registry.retain(|_, files| files.len() >= 2);
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let stdout = std::io::stdout();
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let mut stdout_handle = stdout.lock();
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if cfg.verbosity > 0 {
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stdout_handle.write_all(format!("considering {} total files for duplicates\n", registry.iter().map(|(_,files)| files.len()).sum::<usize>()).as_bytes()).unwrap();
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}
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for (fsize, mut files) in registry {
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if files.len() > 8 {
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files.sort_by_key(|path| path.file_name().unwrap_or_default().to_string_lossy().to_string());
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}
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if cfg.verbosity > 1 {
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stdout_handle.write_all(format!("considering {} files of size {} for duplicates\n", files.len(), fsize).as_bytes()).unwrap();
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}
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for i in (0..files.len()).rev() {
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let f1 = &files[i];
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for j in (0..i).rev() {
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let f2 = &files[j];
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if !are_hardlinked(f1, f2) && cmp(f1, f2) {
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if !cfg.dry_run {
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if let Err(msg) = hardlink(f1, f2) {
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eprintln!("{}: {}", msg, format_pair(f1, f2, cfg));
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continue
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}
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}
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if cfg.verbosity >= 0 {
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stdout_handle.write_all(b"hardlinked ").unwrap();
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stdout_handle.write_all(format_pair(f1, f2, cfg).as_bytes()).unwrap();
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}
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}
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}
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}
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}
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Ok(())
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}
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fn hardlink(f1: &PathBuf, f2: &PathBuf) -> Result<(), &'static str> {
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if let Err(_) = std::fs::remove_file(f2) {
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Err("failed to remove second file for hardlinking")
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} else if let Err(_) = std::fs::hard_link(f1, f2) { // same as ln in terms of args: left args's inode becomes right arg's inode
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match std::fs::copy(f1, f2) {
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Ok(_) => Err("failed to hardlink (copied instead)"),
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Err(_) => Err("failed to hardlink or copy")
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}
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} else {
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Ok(())
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}
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}
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/// adds newline at the end
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fn format_pair(f1: &PathBuf, f2: &PathBuf, cfg: &Config) -> String {
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let f1s = f1.to_string_lossy();
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let f2s = f2.to_string_lossy();
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if cfg.no_brace_output {
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return format!(
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"hardlinked {} {}\n",
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shlex::quote(&f1s),
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shlex::quote(&f2s)
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)
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}
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let prefix = common_prefix(&f1s, &f2s);
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let suffix = common_suffix(&f1s, &f2s);
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let prefixlong = prefix.len() > 2;
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let suffixlong = suffix.len() > 2;
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if prefixlong && suffixlong {
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format!(
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"hardlinked {}{{{},{}}}{}\n",
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shlex::quote(prefix),
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shlex::quote(&f1s[ prefix.len()..std::cmp::max(prefix.len(), f1s.len()-suffix.len()) ]),
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shlex::quote(&f2s[ prefix.len()..std::cmp::max(prefix.len(), f2s.len()-suffix.len()) ]),
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shlex::quote(suffix)
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)
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} else if prefixlong {
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format!(
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"hardlinked {}{{{},{}}}\n",
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shlex::quote(prefix),
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shlex::quote(&f1s[prefix.len()..]),
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shlex::quote(&f2s[prefix.len()..])
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)
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} else if suffixlong {
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format!(
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"hardlinked {{{},{}}}{}\n",
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shlex::quote(&f1s[..f1s.len()-suffix.len()]),
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shlex::quote(&f2s[..f2s.len()-suffix.len()]),
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shlex::quote(suffix),
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)
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} else {
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format!(
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"hardlinked {} {}\n",
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shlex::quote(&f1s),
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shlex::quote(&f2s)
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)
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}
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}
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/// recursively register path or its contents if directory into registry
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fn register(path: PathBuf, registry: &mut HashMap<u64, Vec<PathBuf>>, cfg: &Config) {
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if let Ok(metadata) = std::fs::symlink_metadata(&path) {
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if metadata.file_type().is_symlink() {
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return
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}
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if metadata.st_size() < cfg.min_size {
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return
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}
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} else { return }
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if path.is_file() {
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if let Some(size) = std::fs::metadata(&path).ok().map(|meta| meta.len()) {
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if size != 0 {
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registry.entry(size).or_insert(Vec::new()).push(path);
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}
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}
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} else if path.is_dir() {
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if let Ok(entries) = std::fs::read_dir(path) {
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for entry in entries {
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if let Ok(entry) = entry {
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register(entry.path(), registry, cfg);
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}
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}
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}
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}
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}
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fn are_hardlinked(f1: &PathBuf, f2: &PathBuf) -> bool {
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if let (Ok(md1), Ok(md2)) = (std::fs::metadata(f1), std::fs::metadata(f2)) {
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md1.st_ino() == md2.st_ino()
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} else {
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false
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}
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}
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/// check equality of contents of two paths to files
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fn cmp(f1: &PathBuf, f2: &PathBuf) -> bool {
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if let Ok(mut f1) = std::fs::File::open(f1) {
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if let Ok(mut f2) = std::fs::File::open(f2) {
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cmp_files(&mut f1, &mut f2)
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} else { false }
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} else { false }
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}
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/// check equality of contents of two open files
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fn cmp_files(f1: &mut std::fs::File, f2: &mut std::fs::File) -> bool {
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let buff1: &mut[u8] = &mut [0; 1024];
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let buff2: &mut[u8] = &mut [0; 1024];
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loop {
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match f1.read(buff1) {
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Err(_) => return false,
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Ok(readlen1) => match f2.read(buff2) {
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Err(_) => return false,
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Ok(readlen2) => {
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if readlen1 != readlen2 {
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return false;
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}
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if readlen1 == 0 {
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return true;
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}
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if &buff1[0..readlen1] != &buff2[0..readlen2] {
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return false;
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}
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}
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}
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}
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}
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}
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fn common_prefix<'a>(s1: &'a str, s2: &'a str) -> &'a str {
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let len = s1
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.chars()
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.zip(s2.chars())
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.take_while(|(char1, char2)| char1 == char2)
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.count();
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&s1[..len]
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}
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fn common_suffix<'a>(s1: &'a str, s2: &'a str) -> &'a str {
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let len = s1
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.chars()
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.rev()
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.zip(s2.chars().rev())
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.take_while(|(char1, char2)| char1 == char2)
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.count();
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&s1[s1.len() - len..]
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}
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fn split_vec(input: &[String], delimiter: &str) -> Vec<Vec<String>> {
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let mut result: Vec<Vec<String>> = Vec::new();
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let mut current_vec: Vec<String> = Vec::new();
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for item in input.iter() {
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if item == delimiter {
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if !current_vec.is_empty() {
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result.push(current_vec);
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}
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current_vec = Vec::new();
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} else {
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current_vec.push(item.to_string());
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}
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}
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if !current_vec.is_empty() {
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result.push(current_vec);
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}
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result
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}
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