mv: Use rustc-hash

Author: oech3

Cargo.lock

@@ -19,6 +19,7 @@ workspace = true
 path = "src/mv.rs"
 
 [dependencies]
+rustc-hash = { workspace = true }
 clap = { workspace = true }
 fs_extra = { workspace = true }
 indicatif = { workspace = true }

src/uu/mv/Cargo.toml

@@ -9,7 +9,7 @@
 //! This module provides functionality to preserve hardlink relationships
 //! when moving files across different filesystems/partitions.
 
-use std::collections::HashMap;
+use rustc_hash::FxHashMap;
 use std::io;
 use std::path::{Path, PathBuf};
 
@@ -19,14 +19,14 @@ use uucore::display::Quotable;
 #[derive(Debug, Default)]
 pub struct HardlinkTracker {
     /// Maps (device, inode) -> destination path for the first occurrence
-    inode_map: HashMap<(u64, u64), PathBuf>,
+    inode_map: FxHashMap<(u64, u64), PathBuf>,
 }
 
 /// Pre-scans files to identify hardlink groups with optimized memory usage
 #[derive(Debug, Default)]
 pub struct HardlinkGroupScanner {
     /// Maps (device, inode) -> list of source paths that are hardlinked together
-    hardlink_groups: HashMap<(u64, u64), Vec<PathBuf>>,
+    hardlink_groups: FxHashMap<(u64, u64), Vec<PathBuf>>,
     /// List of source files/directories being moved (for destination mapping)
     source_files: Vec<PathBuf>,
     /// Whether scanning has been performed

src/uu/mv/src/hardlink.rs

@@ -15,8 +15,8 @@ use clap::{Arg, ArgAction, ArgMatches, Command};
 use indicatif::{MultiProgress, ProgressBar, ProgressStyle};
 
 #[cfg(all(unix, not(any(target_os = "macos", target_os = "redox"))))]
-use std::collections::HashMap;
-use std::collections::HashSet;
+use rustc_hash::FxHashMap;
+use rustc_hash::FxHashSet;
 use std::env;
 use std::ffi::OsString;
 use std::fs;
@@ -575,7 +575,8 @@ pub fn mv(files: &[OsString], opts: &Options) -> UResult<()> {
 #[allow(clippy::cognitive_complexity)]
 fn move_files_into_dir(files: &[PathBuf], target_dir: &Path, options: &Options) -> UResult<()> {
     // remember the moved destinations for further usage
-    let mut moved_destinations: HashSet<PathBuf> = HashSet::with_capacity(files.len());
+    let mut moved_destinations: FxHashSet<PathBuf> =
+        FxHashSet::with_capacity_and_hasher(files.len(), rustc_hash::FxBuildHasher);
     // Create hardlink tracking context
     #[cfg(unix)]
     let (mut hardlink_tracker, hardlink_scanner) = {
@@ -967,7 +968,7 @@ fn rename_dir_fallback(
     };
 
     #[cfg(all(unix, not(any(target_os = "macos", target_os = "redox"))))]
-    let xattrs = fsxattr::retrieve_xattrs(from).unwrap_or_else(|_| HashMap::new());
+    let xattrs = fsxattr::retrieve_xattrs(from).unwrap_or_else(|_| FxHashMap::default());
 
     // Use directory copying (with or without hardlink support)
     let result = copy_dir_contents(

src/uu/mv/src/mv.rs

@@ -36,6 +36,7 @@ jiff = { workspace = true, optional = true, features = [
   "tzdb-zoneinfo",
   "tzdb-concatenated",
 ] }
+rustc-hash = { workspace = true }
 time = { workspace = true, optional = true, features = [
   "formatting",
   "local-offset",

src/uucore/Cargo.toml

@@ -7,7 +7,7 @@
 
 //! Set of functions to manage xattr on files and dirs
 use itertools::Itertools;
-use std::collections::HashMap;
+use rustc_hash::FxHashMap;
 use std::ffi::{OsStr, OsString};
 #[cfg(unix)]
 use std::os::unix::ffi::OsStrExt;
@@ -54,8 +54,8 @@ pub fn copy_xattrs_skip_selinux<P: AsRef<Path>>(source: P, dest: P) -> std::io::
 /// # Returns
 ///
 /// A result containing a HashMap of attributes names and values, or an error.
-pub fn retrieve_xattrs<P: AsRef<Path>>(source: P) -> std::io::Result<HashMap<OsString, Vec<u8>>> {
-    let mut attrs = HashMap::new();
+pub fn retrieve_xattrs<P: AsRef<Path>>(source: P) -> std::io::Result<FxHashMap<OsString, Vec<u8>>> {
+    let mut attrs = FxHashMap::default();
     for attr_name in xattr::list(&source)? {
         if let Some(value) = xattr::get(&source, &attr_name)? {
             attrs.insert(attr_name, value);
@@ -76,7 +76,7 @@ pub fn retrieve_xattrs<P: AsRef<Path>>(source: P) -> std::io::Result<HashMap<OsS
 /// A result indicating success or failure.
 pub fn apply_xattrs<P: AsRef<Path>>(
     dest: P,
-    xattrs: HashMap<OsString, Vec<u8>>,
+    xattrs: FxHashMap<OsString, Vec<u8>>,
 ) -> std::io::Result<()> {
     for (attr, value) in xattrs {
         xattr::set(&dest, &attr, &value)?;
@@ -207,7 +207,7 @@ mod tests {
 
         File::create(&file_path).unwrap();
 
-        let mut test_xattrs = HashMap::new();
+        let mut test_xattrs = FxHashMap::default();
         let test_attr = "user.test_attr";
         let test_value = b"test value";
         test_xattrs.insert(OsString::from(test_attr), test_value.to_vec());