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use std::ffi::OsStr;
use std::fmt;
use std::fs::{self, FileType};
use std::path::{Path, PathBuf};
use crate::error::Error;
use crate::Result;
/// A directory entry.
///
/// This is the type of value that is yielded from the iterators defined in
/// this crate.
///
/// On Unix systems, this type implements the [`DirEntryExt`] trait, which
/// provides efficient access to the inode number of the directory entry.
///
/// # Differences with `std::fs::DirEntry`
///
/// This type mostly mirrors the type by the same name in [`std::fs`]. There
/// are some differences however:
///
/// * All recursive directory iterators must inspect the entry's type.
/// Therefore, the value is stored and its access is guaranteed to be cheap and
/// successful.
/// * [`path`] and [`file_name`] return borrowed variants.
/// * If [`follow_links`] was enabled on the originating iterator, then all
/// operations except for [`path`] operate on the link target. Otherwise, all
/// operations operate on the symbolic link.
///
/// [`path`]: #method.path
/// [`file_name`]: #method.file_name
/// [`follow_links`]: struct.WalkDir.html#method.follow_links
/// [`DirEntryExt`]: trait.DirEntryExt.html
pub struct DirEntry {
/// The path as reported by the [`fs::ReadDir`] iterator (even if it's a
/// symbolic link).
///
path: PathBuf,
/// The file type. Necessary for recursive iteration, so store it.
ty: FileType,
/// Is set when this entry was created from a symbolic link and the user
/// expects the iterator to follow symbolic links.
follow_link: bool,
/// The depth at which this entry was generated relative to the root.
depth: usize,
/// The underlying inode number (Unix only).
#[cfg(unix)]
ino: u64,
/// The underlying metadata (Windows only). We store this on Windows
/// because this comes for free while reading a directory.
///
/// We use this to determine whether an entry is a directory or not, which
/// works around a bug in Rust's standard library:
#[cfg(windows)]
metadata: fs::Metadata,
}
impl DirEntry {
/// The full path that this entry represents.
///
/// The full path is created by joining the parents of this entry up to the
/// root initially given to [`WalkDir::new`] with the file name of this
/// entry.
///
/// Note that this *always* returns the path reported by the underlying
/// directory entry, even when symbolic links are followed. To get the
/// target path, use [`path_is_symlink`] to (cheaply) check if this entry
/// corresponds to a symbolic link, and [`std::fs::read_link`] to resolve
/// the target.
///
/// [`WalkDir::new`]: struct.WalkDir.html#method.new
/// [`path_is_symlink`]: struct.DirEntry.html#method.path_is_symlink
pub fn path(&self) -> &Path {
&self.path
}
/// The full path that this entry represents.
///
/// Analogous to [`path`], but moves ownership of the path.
///
/// [`path`]: struct.DirEntry.html#method.path
pub fn into_path(self) -> PathBuf {
self.path
}
/// Returns `true` if and only if this entry was created from a symbolic
/// link. This is unaffected by the [`follow_links`] setting.
///
/// When `true`, the value returned by the [`path`] method is a
/// symbolic link name. To get the full target path, you must call
/// [`std::fs::read_link(entry.path())`].
///
/// [`path`]: struct.DirEntry.html#method.path
/// [`follow_links`]: struct.WalkDir.html#method.follow_links
pub fn path_is_symlink(&self) -> bool {
self.ty.is_symlink() || self.follow_link
}
/// Return the metadata for the file that this entry points to.
///
/// This will follow symbolic links if and only if the [`WalkDir`] value
/// has [`follow_links`] enabled.
///
/// # Platform behavior
///
/// This always calls [`std::fs::symlink_metadata`].
///
/// If this entry is a symbolic link and [`follow_links`] is enabled, then
/// [`std::fs::metadata`] is called instead.
///
/// # Errors
///
/// Similar to [`std::fs::metadata`], returns errors for path values that
/// the program does not have permissions to access or if the path does not
/// exist.
///
/// [`WalkDir`]: struct.WalkDir.html
/// [`follow_links`]: struct.WalkDir.html#method.follow_links
pub fn metadata(&self) -> Result<fs::Metadata> {
self.metadata_internal()
}
#[cfg(windows)]
fn metadata_internal(&self) -> Result<fs::Metadata> {
if self.follow_link {
fs::metadata(&self.path)
} else {
Ok(self.metadata.clone())
}
.map_err(|err| Error::from_entry(self, err))
}
#[cfg(not(windows))]
fn metadata_internal(&self) -> Result<fs::Metadata> {
if self.follow_link {
fs::metadata(&self.path)
} else {
fs::symlink_metadata(&self.path)
}
.map_err(|err| Error::from_entry(self, err))
}
/// Return the file type for the file that this entry points to.
///
/// If this is a symbolic link and [`follow_links`] is `true`, then this
/// returns the type of the target.
///
/// This never makes any system calls.
///
/// [`follow_links`]: struct.WalkDir.html#method.follow_links
pub fn file_type(&self) -> fs::FileType {
self.ty
}
/// Return the file name of this entry.
///
/// If this entry has no file name (e.g., `/`), then the full path is
/// returned.
pub fn file_name(&self) -> &OsStr {
self.path.file_name().unwrap_or_else(|| self.path.as_os_str())
}
/// Returns the depth at which this entry was created relative to the root.
///
/// The smallest depth is `0` and always corresponds to the path given
/// to the `new` function on `WalkDir`. Its direct descendents have depth
/// `1`, and their descendents have depth `2`, and so on.
pub fn depth(&self) -> usize {
self.depth
}
/// Returns true if and only if this entry points to a directory.
///
/// This works around a bug in Rust's standard library:
#[cfg(windows)]
pub(crate) fn is_dir(&self) -> bool {
use std::os::windows::fs::MetadataExt;
use winapi::um::winnt::FILE_ATTRIBUTE_DIRECTORY;
self.metadata.file_attributes() & FILE_ATTRIBUTE_DIRECTORY != 0
}
/// Returns true if and only if this entry points to a directory.
#[cfg(not(windows))]
pub(crate) fn is_dir(&self) -> bool {
self.ty.is_dir()
}
#[cfg(windows)]
pub(crate) fn from_entry(
depth: usize,
ent: &fs::DirEntry,
) -> Result<DirEntry> {
let path = ent.path();
let ty = ent
.file_type()
.map_err(|err| Error::from_path(depth, path.clone(), err))?;
let md = ent
.metadata()
.map_err(|err| Error::from_path(depth, path.clone(), err))?;
Ok(DirEntry {
path: path,
ty: ty,
follow_link: false,
depth: depth,
metadata: md,
})
}
#[cfg(unix)]
pub(crate) fn from_entry(
depth: usize,
ent: &fs::DirEntry,
) -> Result<DirEntry> {
use std::os::unix::fs::DirEntryExt;
let ty = ent
.file_type()
.map_err(|err| Error::from_path(depth, ent.path(), err))?;
Ok(DirEntry {
path: ent.path(),
ty: ty,
follow_link: false,
depth: depth,
ino: ent.ino(),
})
}
#[cfg(not(any(unix, windows)))]
pub(crate) fn from_entry(
depth: usize,
ent: &fs::DirEntry,
) -> Result<DirEntry> {
let ty = ent
.file_type()
.map_err(|err| Error::from_path(depth, ent.path(), err))?;
Ok(DirEntry {
path: ent.path(),
ty: ty,
follow_link: false,
depth: depth,
})
}
#[cfg(windows)]
pub(crate) fn from_path(
depth: usize,
pb: PathBuf,
follow: bool,
) -> Result<DirEntry> {
let md = if follow {
fs::metadata(&pb)
.map_err(|err| Error::from_path(depth, pb.clone(), err))?
} else {
fs::symlink_metadata(&pb)
.map_err(|err| Error::from_path(depth, pb.clone(), err))?
};
Ok(DirEntry {
path: pb,
ty: md.file_type(),
follow_link: follow,
depth: depth,
metadata: md,
})
}
#[cfg(unix)]
pub(crate) fn from_path(
depth: usize,
pb: PathBuf,
follow: bool,
) -> Result<DirEntry> {
use std::os::unix::fs::MetadataExt;
let md = if follow {
fs::metadata(&pb)
.map_err(|err| Error::from_path(depth, pb.clone(), err))?
} else {
fs::symlink_metadata(&pb)
.map_err(|err| Error::from_path(depth, pb.clone(), err))?
};
Ok(DirEntry {
path: pb,
ty: md.file_type(),
follow_link: follow,
depth: depth,
ino: md.ino(),
})
}
#[cfg(not(any(unix, windows)))]
pub(crate) fn from_path(
depth: usize,
pb: PathBuf,
follow: bool,
) -> Result<DirEntry> {
let md = if follow {
fs::metadata(&pb)
.map_err(|err| Error::from_path(depth, pb.clone(), err))?
} else {
fs::symlink_metadata(&pb)
.map_err(|err| Error::from_path(depth, pb.clone(), err))?
};
Ok(DirEntry {
path: pb,
ty: md.file_type(),
follow_link: follow,
depth: depth,
})
}
}
impl Clone for DirEntry {
#[cfg(windows)]
fn clone(&self) -> DirEntry {
DirEntry {
path: self.path.clone(),
ty: self.ty,
follow_link: self.follow_link,
depth: self.depth,
metadata: self.metadata.clone(),
}
}
#[cfg(unix)]
fn clone(&self) -> DirEntry {
DirEntry {
path: self.path.clone(),
ty: self.ty,
follow_link: self.follow_link,
depth: self.depth,
ino: self.ino,
}
}
#[cfg(not(any(unix, windows)))]
fn clone(&self) -> DirEntry {
DirEntry {
path: self.path.clone(),
ty: self.ty,
follow_link: self.follow_link,
depth: self.depth,
}
}
}
impl fmt::Debug for DirEntry {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "DirEntry({:?})", self.path)
}
}
/// Unix-specific extension methods for `walkdir::DirEntry`
#[cfg(unix)]
pub trait DirEntryExt {
/// Returns the underlying `d_ino` field in the contained `dirent`
/// structure.
fn ino(&self) -> u64;
}
#[cfg(unix)]
impl DirEntryExt for DirEntry {
/// Returns the underlying `d_ino` field in the contained `dirent`
/// structure.
fn ino(&self) -> u64 {
self.ino
}
}