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//! This crate provides functions that allow moving files to the operating system's Recycle Bin or
//! Trash, or the equivalent.
//!
//! Furthermore on Linux and on Windows additional functions are available from the `os_limited`
//! module.
//!
//! ### Potential UB on Linux and FreeBSD
//!
//! When querying information about mount points, non-threadsafe versions of `libc::getmnt(info|ent)` are
//! used which can cause UB if another thread calls into the same function, _probably_ only if the mountpoints
//! changed as well.
//!
//! To neutralize the issue, the respective function in this crate has been made thread-safe with a Mutex.
//!
//! **If your crate calls into the aforementioned methods directly or indirectly from other threads,
//! rather not use this crate.**
//!
//! As the handling of UB is clearly a trade-off and certainly goes against the zero-chance-of-UB goal
//! of the Rust community, please interact with us [in the tracking issue](https://github.com/Byron/trash-rs/issues/42)
//! to help find a more permanent solution.
//!
//! ### Notes on the Linux implementation
//!
//! This library implements version 1.0 of the [Freedesktop.org
//! Trash](https://specifications.freedesktop.org/trash-spec/trashspec-1.0.html) specification and
//! aims to match the behaviour of Ubuntu 18.04 GNOME in cases of ambiguity. Most -if not all- Linux
//! distributions that ship with a desktop environment follow this specification. For example
//! GNOME, KDE, and XFCE all use this convention. This crate blindly assumes that the Linux
//! distribution it runs on, follows this specification.
//!
use std::ffi::OsString;
use std::hash::{Hash, Hasher};
use std::path::{Path, PathBuf};
use std::fmt;
use std::{env::current_dir, error};
use log::trace;
#[cfg(test)]
pub mod tests;
#[cfg(target_os = "windows")]
#[path = "windows.rs"]
mod platform;
#[cfg(all(unix, not(target_os = "macos"), not(target_os = "ios"), not(target_os = "android")))]
#[path = "freedesktop.rs"]
mod platform;
#[cfg(target_os = "macos")]
pub mod macos;
#[cfg(target_os = "macos")]
use macos as platform;
pub const DEFAULT_TRASH_CTX: TrashContext = TrashContext::new();
/// A collection of preferences for trash operations.
#[derive(Clone, Default, Debug)]
pub struct TrashContext {
#[cfg_attr(not(target_os = "macos"), allow(dead_code))]
platform_specific: platform::PlatformTrashContext,
}
impl TrashContext {
pub const fn new() -> Self {
Self { platform_specific: platform::PlatformTrashContext::new() }
}
/// Removes a single file or directory.
///
/// When a symbolic link is provided to this function, the symbolic link will be removed and the link
/// target will be kept intact.
///
/// # Example
///
/// ```
/// use std::fs::File;
/// use trash::delete;
/// File::create("delete_me").unwrap();
/// trash::delete("delete_me").unwrap();
/// assert!(File::open("delete_me").is_err());
/// ```
pub fn delete<T: AsRef<Path>>(&self, path: T) -> Result<(), Error> {
self.delete_all(&[path])
}
/// Removes all files/directories specified by the collection of paths provided as an argument.
///
/// When a symbolic link is provided to this function, the symbolic link will be removed and the link
/// target will be kept intact.
///
/// # Example
///
/// ```
/// use std::fs::File;
/// use trash::delete_all;
/// File::create("delete_me_1").unwrap();
/// File::create("delete_me_2").unwrap();
/// delete_all(&["delete_me_1", "delete_me_2"]).unwrap();
/// assert!(File::open("delete_me_1").is_err());
/// assert!(File::open("delete_me_2").is_err());
/// ```
pub fn delete_all<I, T>(&self, paths: I) -> Result<(), Error>
where
I: IntoIterator<Item = T>,
T: AsRef<Path>,
{
trace!("Starting canonicalize_paths");
let full_paths = canonicalize_paths(paths)?;
trace!("Finished canonicalize_paths");
self.delete_all_canonicalized(full_paths)
}
}
/// Convenience method for `DEFAULT_TRASH_CTX.delete()`.
///
/// See: [`TrashContext::delete`](TrashContext::delete)
pub fn delete<T: AsRef<Path>>(path: T) -> Result<(), Error> {
DEFAULT_TRASH_CTX.delete(path)
}
/// Convenience method for `DEFAULT_TRASH_CTX.delete_all()`.
///
/// See: [`TrashContext::delete_all`](TrashContext::delete_all)
pub fn delete_all<I, T>(paths: I) -> Result<(), Error>
where
I: IntoIterator<Item = T>,
T: AsRef<Path>,
{
DEFAULT_TRASH_CTX.delete_all(paths)
}
///
/// Provides information about an error.
///
#[derive(Debug)]
pub enum Error {
Unknown {
description: String,
},
/// **freedesktop only**
///
/// Error coming from file system
#[cfg(all(unix, not(target_os = "macos"), not(target_os = "ios"), not(target_os = "android")))]
FileSystem {
path: PathBuf,
kind: std::io::ErrorKind,
},
/// One of the target items was a root folder.
/// If a list of items are requested to be removed by a single function call (e.g. `delete_all`)
/// and this error is returned, then it's guaranteed that none of the items is removed.
TargetedRoot,
/// The `target` does not exist or the process has insufficient permissions to access it.
CouldNotAccess {
target: String,
},
/// Error while canonicalizing path.
CanonicalizePath {
/// Path that triggered the error.
original: PathBuf,
},
/// Error while converting an [`OsString`] to a [`String`].
///
/// This may also happen when converting a [`Path`] or [`PathBuf`] to an [`OsString`].
ConvertOsString {
/// The string that was attempted to be converted.
original: OsString,
},
/// This kind of error happens when a trash item's original parent already contains an item with
/// the same name and type (file or folder). In this case an error is produced and the
/// restoration of the files is halted meaning that there may be files that could be restored
/// but were left in the trash due to the error.
///
/// One should not assume any relationship between the order that the items were supplied and
/// the list of remaining items. That is to say, it may be that the item that collided was in
/// the middle of the provided list but the remaining items' list contains all the provided
/// items.
///
/// `path`: The path of the file that's blocking the trash item from being restored.
///
/// `remaining_items`: All items that were not restored in the order they were provided,
/// starting with the item that triggered the error.
RestoreCollision {
path: PathBuf,
remaining_items: Vec<TrashItem>,
},
/// This sort of error is returned when multiple items with the same `original_path` were
/// requested to be restored. These items are referred to as twins here. If there are twins
/// among the items, then none of the items are restored.
///
/// `path`: The `original_path` of the twins.
///
/// `items`: The complete list of items that were handed over to the `restore_all` function.
RestoreTwins {
path: PathBuf,
items: Vec<TrashItem>,
},
}
impl fmt::Display for Error {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "Error during a `trash` operation: {self:?}")
}
}
impl error::Error for Error {}
pub fn into_unknown<E: std::fmt::Display>(err: E) -> Error {
Error::Unknown { description: format!("{err}") }
}
pub(crate) fn canonicalize_paths<I, T>(paths: I) -> Result<Vec<PathBuf>, Error>
where
I: IntoIterator<Item = T>,
T: AsRef<Path>,
{
let paths = paths.into_iter();
paths
.map(|x| {
let target_ref = x.as_ref();
let target = if target_ref.is_relative() {
let curr_dir = current_dir()
.map_err(|_| Error::CouldNotAccess { target: "[Current working directory]".into() })?;
curr_dir.join(target_ref)
} else {
target_ref.to_owned()
};
let parent = target.parent().ok_or(Error::TargetedRoot)?;
let canonical_parent =
parent.canonicalize().map_err(|_| Error::CanonicalizePath { original: parent.to_owned() })?;
if let Some(file_name) = target.file_name() {
Ok(canonical_parent.join(file_name))
} else {
// `file_name` is none if the path ends with `..`
Ok(canonical_parent)
}
})
.collect::<Result<Vec<_>, _>>()
}
/// This struct holds information about a single item within the trash.
///
/// A trash item can be a file or folder or any other object that the target
/// operating system allows to put into the trash.
#[derive(Debug, Clone)]
pub struct TrashItem {
/// A system specific identifier of the item in the trash.
///
/// On Windows it is the string returned by `IShellItem::GetDisplayName`
/// with the `SIGDN_DESKTOPABSOLUTEPARSING` flag.
///
/// On Linux it is an absolute path to the `.trashinfo` file associated with
/// the item.
pub id: OsString,
/// The name of the item. For example if the folder '/home/user/New Folder'
/// was deleted, its `name` is 'New Folder'
pub name: String,
/// The path to the parent folder of this item before it was put inside the
/// trash. For example if the folder '/home/user/New Folder' is in the
/// trash, its `original_parent` is '/home/user'.
///
/// To get the full path to the file in its original location use the
/// `original_path` function.
pub original_parent: PathBuf,
/// The number of non-leap seconds elapsed between the UNIX Epoch and the
/// moment the file was deleted.
/// Without the "chrono" feature, this will be a negative number on linux only.
pub time_deleted: i64,
}
impl TrashItem {
/// Joins the `original_parent` and `name` fields to obtain the full path to
/// the original file.
pub fn original_path(&self) -> PathBuf {
self.original_parent.join(&self.name)
}
}
impl PartialEq for TrashItem {
fn eq(&self, other: &Self) -> bool {
self.id == other.id
}
}
impl Eq for TrashItem {}
impl Hash for TrashItem {
fn hash<H: Hasher>(&self, state: &mut H) {
self.id.hash(state);
}
}
#[cfg(any(
target_os = "windows",
all(unix, not(target_os = "macos"), not(target_os = "ios"), not(target_os = "android"))
))]
pub mod os_limited {
//! This module provides functionality which is only supported on Windows and
//! Linux or other Freedesktop Trash compliant environment.
use std::{
collections::HashSet,
hash::{Hash, Hasher},
};
use super::{platform, Error, TrashItem};
/// Returns all [`TrashItem`]s that are currently in the trash.
///
/// The items are in no particular order and must be sorted when any kind of ordering is required.
///
/// # Example
///
/// ```
/// use trash::os_limited::list;
/// let trash_items = list().unwrap();
/// println!("{:#?}", trash_items);
/// ```
pub fn list() -> Result<Vec<TrashItem>, Error> {
platform::list()
}
/// Deletes all the provided [`TrashItem`]s permanently.
///
/// This function consumes the provided items.
///
/// # Example
///
/// ```
/// use std::fs::File;
/// use trash::{delete, os_limited::{list, purge_all}};
/// let filename = "trash-purge_all-example";
/// File::create(filename).unwrap();
/// delete(filename).unwrap();
/// // Collect the filtered list just so that we can make sure there's exactly one element.
/// // There's no need to `collect` it otherwise.
/// let selected: Vec<_> = list().unwrap().into_iter().filter(|x| x.name == filename).collect();
/// assert_eq!(selected.len(), 1);
/// purge_all(selected).unwrap();
/// ```
pub fn purge_all<I>(items: I) -> Result<(), Error>
where
I: IntoIterator<Item = TrashItem>,
{
platform::purge_all(items)
}
/// Restores all the provided [`TrashItem`] to their original location.
///
/// This function consumes the provided items.
///
/// # Errors
///
/// Errors this function may return include but are not limited to the following.
///
/// It may be the case that when restoring a file or a folder, the `original_path` already has
/// a new item with the same name. When such a collision happens this function returns a
/// [`RestoreCollision`] kind of error.
///
/// If two or more of the provided items have identical `original_path`s then a
/// [`RestoreTwins`] kind of error is returned.
///
/// # Example
///
/// ```
/// use std::fs::File;
/// use trash::os_limited::{list, restore_all};
/// let filename = "trash-restore_all-example";
/// File::create(filename).unwrap();
/// restore_all(list().unwrap().into_iter().filter(|x| x.name == filename)).unwrap();
/// std::fs::remove_file(filename).unwrap();
/// ```
///
/// [`RestoreCollision`]: Error::RestoreCollision
/// [`RestoreTwins`]: Error::RestoreTwins
pub fn restore_all<I>(items: I) -> Result<(), Error>
where
I: IntoIterator<Item = TrashItem>,
{
// Check for twins here cause that's pretty platform independent.
struct ItemWrapper<'a>(&'a TrashItem);
impl<'a> PartialEq for ItemWrapper<'a> {
fn eq(&self, other: &Self) -> bool {
self.0.original_path() == other.0.original_path()
}
}
impl<'a> Eq for ItemWrapper<'a> {}
impl<'a> Hash for ItemWrapper<'a> {
fn hash<H: Hasher>(&self, state: &mut H) {
self.0.original_path().hash(state);
}
}
let items = items.into_iter().collect::<Vec<_>>();
let mut item_set = HashSet::with_capacity(items.len());
for item in items.iter() {
if !item_set.insert(ItemWrapper(item)) {
return Err(Error::RestoreTwins { path: item.original_path(), items });
}
}
platform::restore_all(items)
}
}