languages/rust
languages/rust
1
0
Fork 0
mirror of https://github.com/rust-lang/rust synced 2024-11-02 14:59:06 +00:00
Code Issues Projects Releases Packages Wiki Activity

Rollup merge of #110188 - Nilstrieb:remove-remove-dir-all, r=jyn514

Browse source 
Remove orphaned remove_dir_all implementation from rust-installer

I have no idea why it's here, but it's not used at all.

r? Mark-Simulacrum
This commit is contained in:
Matthias Krüger 2023-04-12 17:04:32 +02:00 committed by GitHub
commit 2118667ffa
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
3 changed files with 0 additions and 866 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
Cargo.lock
View file

@ -2769,13 +2769,11 @@ dependencies = [
"anyhow",
"clap 3.2.20",
"flate2",
"lazy_static",
"num_cpus",
"rayon",
"remove_dir_all",
"tar",
"walkdir",
"winapi",
"xz2",
]

4
src/tools/rust-installer/Cargo.toml
View file

@ -22,7 +22,3 @@ remove_dir_all = "0.5"
[dependencies.clap]
features = ["derive"]
version = "3.1"
[target."cfg(windows)".dependencies]
lazy_static = "1"
winapi = { version = "0.3", features = ["errhandlingapi", "handleapi", "ioapiset", "winerror", "winioctl", "winnt"] }

860
src/tools/rust-installer/src/remove_dir_all.rs
View file

@ -1,860 +0,0 @@
#![allow(non_snake_case)]
use std::io;
use std::path::Path;
#[cfg(not(windows))]
pub fn remove_dir_all(path: &Path) -> io::Result<()> {
::std::fs::remove_dir_all(path)
}
#[cfg(windows)]
pub fn remove_dir_all(path: &Path) -> io::Result<()> {
win::remove_dir_all(path)
}
#[cfg(windows)]
mod win {
use winapi::ctypes::{c_uint, c_ushort};
use winapi::shared::minwindef::{BOOL, DWORD, FALSE, FILETIME, LPVOID};
use winapi::shared::winerror::{
ERROR_CALL_NOT_IMPLEMENTED, ERROR_INSUFFICIENT_BUFFER, ERROR_NO_MORE_FILES,
};
use winapi::um::errhandlingapi::{GetLastError, SetLastError};
use winapi::um::fileapi::{
CreateFileW, FindFirstFileW, FindNextFileW, GetFileInformationByHandle,
};
use winapi::um::fileapi::{BY_HANDLE_FILE_INFORMATION, CREATE_ALWAYS, CREATE_NEW};
use winapi::um::fileapi::{FILE_BASIC_INFO, FILE_RENAME_INFO, TRUNCATE_EXISTING};
use winapi::um::fileapi::{OPEN_ALWAYS, OPEN_EXISTING};
use winapi::um::handleapi::{CloseHandle, INVALID_HANDLE_VALUE};
use winapi::um::ioapiset::DeviceIoControl;
use winapi::um::libloaderapi::{GetModuleHandleW, GetProcAddress};
use winapi::um::minwinbase::{
FileBasicInfo, FileRenameInfo, FILE_INFO_BY_HANDLE_CLASS, WIN32_FIND_DATAW,
};
use winapi::um::winbase::SECURITY_SQOS_PRESENT;
use winapi::um::winbase::{
FILE_FLAG_BACKUP_SEMANTICS, FILE_FLAG_DELETE_ON_CLOSE, FILE_FLAG_OPEN_REPARSE_POINT,
};
use winapi::um::winioctl::FSCTL_GET_REPARSE_POINT;
use winapi::um::winnt::{DELETE, FILE_ATTRIBUTE_DIRECTORY, HANDLE, LPCWSTR};
use winapi::um::winnt::{FILE_ATTRIBUTE_READONLY, FILE_ATTRIBUTE_REPARSE_POINT};
use winapi::um::winnt::{FILE_GENERIC_WRITE, FILE_WRITE_DATA, GENERIC_READ, GENERIC_WRITE};
use winapi::um::winnt::{FILE_READ_ATTRIBUTES, FILE_WRITE_ATTRIBUTES};
use winapi::um::winnt::{FILE_SHARE_DELETE, FILE_SHARE_READ, FILE_SHARE_WRITE};
use winapi::um::winnt::{IO_REPARSE_TAG_MOUNT_POINT, IO_REPARSE_TAG_SYMLINK, LARGE_INTEGER};
use std::ffi::{OsStr, OsString};
use std::io;
use std::mem;
use std::os::windows::ffi::{OsStrExt, OsStringExt};
use std::path::{Path, PathBuf};
use std::ptr;
use std::sync::Arc;
pub fn remove_dir_all(path: &Path) -> io::Result<()> {
// On Windows it is not enough to just recursively remove the contents of a
// directory and then the directory itself. Deleting does not happen
// instantaneously, but is scheduled.
// To work around this, we move the file or directory to some `base_dir`
// right before deletion to avoid races.
//
// As `base_dir` we choose the parent dir of the directory we want to
// remove. We very probably have permission to create files here, as we
// already need write permission in this dir to delete the directory. And it
// should be on the same volume.
//
// To handle files with names like `CON` and `morse .. .`, and when a
// directory structure is so deep it needs long path names the path is first
// converted to a `//?/`-path with `get_path()`.
//
// To make sure we don't leave a moved file laying around if the process
// crashes before we can delete the file, we do all operations on an file
// handle. By opening a file with `FILE_FLAG_DELETE_ON_CLOSE` Windows will
// always delete the file when the handle closes.
//
// All files are renamed to be in the `base_dir`, and have their name
// changed to "rm-<counter>". After every rename the counter is increased.
// Rename should not overwrite possibly existing files in the base dir. So
// if it fails with `AlreadyExists`, we just increase the counter and try
// again.
//
// For read-only files and directories we first have to remove the read-only
// attribute before we can move or delete them. This also removes the
// attribute from possible hardlinks to the file, so just before closing we
// restore the read-only attribute.
//
// If 'path' points to a directory symlink or junction we should not
// recursively remove the target of the link, but only the link itself.
//
// Moving and deleting is guaranteed to succeed if we are able to open the
// file with `DELETE` permission. If others have the file open we only have
// `DELETE` permission if they have specified `FILE_SHARE_DELETE`. We can
// also delete the file now, but it will not disappear until all others have
// closed the file. But no-one can open the file after we have flagged it
// for deletion.
// Open the path once to get the canonical path, file type and attributes.
let (path, metadata) = {
let mut opts = OpenOptions::new();
opts.access_mode(FILE_READ_ATTRIBUTES);
opts.custom_flags(FILE_FLAG_BACKUP_SEMANTICS | FILE_FLAG_OPEN_REPARSE_POINT);
let file = File::open(path, &opts)?;
(get_path(&file)?, file.file_attr()?)
};
let mut ctx = RmdirContext {
base_dir: match path.parent() {
Some(dir) => dir,
None => {
return Err(io::Error::new(
io::ErrorKind::PermissionDenied,
"can't delete root directory",
))
}
},
readonly: metadata.perm().readonly(),
counter: 0,
};
let filetype = metadata.file_type();
if filetype.is_dir() {
remove_dir_all_recursive(path.as_ref(), &mut ctx)
} else if filetype.is_symlink_dir() {
remove_item(path.as_ref(), &mut ctx)
} else {
Err(io::Error::new(
io::ErrorKind::PermissionDenied,
"Not a directory",
))
}
}
fn readdir(p: &Path) -> io::Result<ReadDir> {
let root = p.to_path_buf();
let star = p.join("*");
let path = to_u16s(&star)?;
unsafe {
let mut wfd = mem::zeroed();
let find_handle = FindFirstFileW(path.as_ptr(), &mut wfd);
if find_handle != INVALID_HANDLE_VALUE {
Ok(ReadDir {
handle: FindNextFileHandle(find_handle),
root: Arc::new(root),
first: Some(wfd),
})
} else {
Err(io::Error::last_os_error())
}
}
}
struct RmdirContext<'a> {
base_dir: &'a Path,
readonly: bool,
counter: u64,
}
fn remove_dir_all_recursive(path: &Path, ctx: &mut RmdirContext) -> io::Result<()> {
let dir_readonly = ctx.readonly;
for child in readdir(path)? {
let child = child?;
let child_type = child.file_type()?;
ctx.readonly = child.metadata()?.perm().readonly();
if child_type.is_dir() {
remove_dir_all_recursive(&child.path(), ctx)?;
} else {
remove_item(&child.path().as_ref(), ctx)?;
}
}
ctx.readonly = dir_readonly;
remove_item(path, ctx)
}
fn remove_item(path: &Path, ctx: &mut RmdirContext) -> io::Result<()> {
if !ctx.readonly {
let mut opts = OpenOptions::new();
opts.access_mode(DELETE);
opts.custom_flags(
FILE_FLAG_BACKUP_SEMANTICS | // delete directory
FILE_FLAG_OPEN_REPARSE_POINT | // delete symlink
FILE_FLAG_DELETE_ON_CLOSE,
);
let file = File::open(path, &opts)?;
move_item(&file, ctx)
} else {
// remove read-only permision
set_perm(&path, FilePermissions::new())?;
// move and delete file, similar to !readonly.
// only the access mode is different.
let mut opts = OpenOptions::new();
opts.access_mode(DELETE | FILE_WRITE_ATTRIBUTES);
opts.custom_flags(
FILE_FLAG_BACKUP_SEMANTICS
| FILE_FLAG_OPEN_REPARSE_POINT
| FILE_FLAG_DELETE_ON_CLOSE,
);
let file = File::open(path, &opts)?;
move_item(&file, ctx)?;
// restore read-only flag just in case there are other hard links
let mut perm = FilePermissions::new();
perm.set_readonly(true);
let _ = file.set_perm(perm); // ignore if this fails
Ok(())
}
}
macro_rules! compat_fn {
($module:ident: $(
fn $symbol:ident($($argname:ident: $argtype:ty),*)
-> $rettype:ty {
$($body:expr);*
}
)*) => ($(
#[allow(unused_variables)]
unsafe fn $symbol($($argname: $argtype),*) -> $rettype {
use std::sync::atomic::{AtomicUsize, Ordering};
use std::mem;
use std::ffi::CString;
type F = unsafe extern "system" fn($($argtype),*) -> $rettype;
lazy_static! { static ref PTR: AtomicUsize = AtomicUsize::new(0);}
fn lookup(module: &str, symbol: &str) -> Option<usize> {
let mut module: Vec<u16> = module.encode_utf16().collect();
module.push(0);
let symbol = CString::new(symbol).unwrap();
unsafe {
let handle = GetModuleHandleW(module.as_ptr());
match GetProcAddress(handle, symbol.as_ptr()) as usize {
0 => None,
n => Some(n),
}
}
}
fn store_func(ptr: &AtomicUsize, module: &str, symbol: &str,
fallback: usize) -> usize {
let value = lookup(module, symbol).unwrap_or(fallback);
ptr.store(value, Ordering::SeqCst);
value
}
fn load() -> usize {
store_func(&PTR, stringify!($module), stringify!($symbol), fallback as usize)
}
unsafe extern "system" fn fallback($($argname: $argtype),*)
-> $rettype {
$($body);*
}
let addr = match PTR.load(Ordering::SeqCst) {
0 => load(),
n => n,
};
mem::transmute::<usize, F>(addr)($($argname),*)
}
)*)
}
compat_fn! {
kernel32:
fn GetFinalPathNameByHandleW(_hFile: HANDLE,
_lpszFilePath: LPCWSTR,
_cchFilePath: DWORD,
_dwFlags: DWORD) -> DWORD {
SetLastError(ERROR_CALL_NOT_IMPLEMENTED as DWORD); 0
}
fn SetFileInformationByHandle(_hFile: HANDLE,
_FileInformationClass: FILE_INFO_BY_HANDLE_CLASS,
_lpFileInformation: LPVOID,
_dwBufferSize: DWORD) -> BOOL {
SetLastError(ERROR_CALL_NOT_IMPLEMENTED as DWORD); 0
}
}
fn cvt(i: i32) -> io::Result<i32> {
if i == 0 {
Err(io::Error::last_os_error())
} else {
Ok(i)
}
}
fn to_u16s<S: AsRef<OsStr>>(s: S) -> io::Result<Vec<u16>> {
fn inner(s: &OsStr) -> io::Result<Vec<u16>> {
let mut maybe_result: Vec<u16> = s.encode_wide().collect();
if maybe_result.iter().any(|&u| u == 0) {
return Err(io::Error::new(
io::ErrorKind::InvalidInput,
"strings passed to WinAPI cannot contain NULs",
));
}
maybe_result.push(0);
Ok(maybe_result)
}
inner(s.as_ref())
}
fn truncate_utf16_at_nul<'a>(v: &'a [u16]) -> &'a [u16] {
match v.iter().position(|c| *c == 0) {
// don't include the 0
Some(i) => &v[..i],
None => v,
}
}
fn fill_utf16_buf<F1, F2, T>(mut f1: F1, f2: F2) -> io::Result<T>
where
F1: FnMut(*mut u16, DWORD) -> DWORD,
F2: FnOnce(&[u16]) -> T,
{
// Start off with a stack buf but then spill over to the heap if we end up
// needing more space.
let mut stack_buf = [0u16; 512];
let mut heap_buf = Vec::new();
unsafe {
let mut n = stack_buf.len();
loop {
let buf = if n <= stack_buf.len() {
&mut stack_buf[..]
} else {
let extra = n - heap_buf.len();
heap_buf.reserve(extra);
heap_buf.set_len(n);
&mut heap_buf[..]
};
// This function is typically called on windows API functions which
// will return the correct length of the string, but these functions
// also return the `0` on error. In some cases, however, the
// returned "correct length" may actually be 0!
//
// To handle this case we call `SetLastError` to reset it to 0 and
// then check it again if we get the "0 error value". If the "last
// error" is still 0 then we interpret it as a 0 length buffer and
// not an actual error.
SetLastError(0);
let k = match f1(buf.as_mut_ptr(), n as DWORD) {
0 if GetLastError() == 0 => 0,
0 => return Err(io::Error::last_os_error()),
n => n,
} as usize;
if k == n && GetLastError() == ERROR_INSUFFICIENT_BUFFER {
n *= 2;
} else if k >= n {
n = k;
} else {
return Ok(f2(&buf[..k]));
}
}
}
}
#[derive(Clone, PartialEq, Eq, Debug, Default)]
struct FilePermissions {
readonly: bool,
}
impl FilePermissions {
fn new() -> FilePermissions {
Default::default()
}
fn readonly(&self) -> bool {
self.readonly
}
fn set_readonly(&mut self, readonly: bool) {
self.readonly = readonly
}
}
#[derive(Clone)]
struct OpenOptions {
// generic
read: bool,
write: bool,
append: bool,
truncate: bool,
create: bool,
create_new: bool,
// system-specific
custom_flags: u32,
access_mode: Option<DWORD>,
attributes: DWORD,
share_mode: DWORD,
security_qos_flags: DWORD,
security_attributes: usize, // FIXME: should be a reference
}
impl OpenOptions {
fn new() -> OpenOptions {
OpenOptions {
// generic
read: false,
write: false,
append: false,
truncate: false,
create: false,
create_new: false,
// system-specific
custom_flags: 0,
access_mode: None,
share_mode: FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
attributes: 0,
security_qos_flags: 0,
security_attributes: 0,
}
}
fn custom_flags(&mut self, flags: u32) {
self.custom_flags = flags;
}
fn access_mode(&mut self, access_mode: u32) {
self.access_mode = Some(access_mode);
}
fn get_access_mode(&self) -> io::Result<DWORD> {
const ERROR_INVALID_PARAMETER: i32 = 87;
match (self.read, self.write, self.append, self.access_mode) {
(_, _, _, Some(mode)) => Ok(mode),
(true, false, false, None) => Ok(GENERIC_READ),
(false, true, false, None) => Ok(GENERIC_WRITE),
(true, true, false, None) => Ok(GENERIC_READ | GENERIC_WRITE),
(false, _, true, None) => Ok(FILE_GENERIC_WRITE & !FILE_WRITE_DATA),
(true, _, true, None) => Ok(GENERIC_READ | (FILE_GENERIC_WRITE & !FILE_WRITE_DATA)),
(false, false, false, None) => {
Err(io::Error::from_raw_os_error(ERROR_INVALID_PARAMETER))
}
}
}
fn get_creation_mode(&self) -> io::Result<DWORD> {
const ERROR_INVALID_PARAMETER: i32 = 87;
match (self.write, self.append) {
(true, false) => {}
(false, false) => {
if self.truncate || self.create || self.create_new {
return Err(io::Error::from_raw_os_error(ERROR_INVALID_PARAMETER));
}
}
(_, true) => {
if self.truncate && !self.create_new {
return Err(io::Error::from_raw_os_error(ERROR_INVALID_PARAMETER));
}
}
}
Ok(match (self.create, self.truncate, self.create_new) {
(false, false, false) => OPEN_EXISTING,
(true, false, false) => OPEN_ALWAYS,
(false, true, false) => TRUNCATE_EXISTING,
(true, true, false) => CREATE_ALWAYS,
(_, _, true) => CREATE_NEW,
})
}
fn get_flags_and_attributes(&self) -> DWORD {
self.custom_flags
| self.attributes
| self.security_qos_flags
| if self.security_qos_flags != 0 {
SECURITY_SQOS_PRESENT
} else {
0
}
| if self.create_new {
FILE_FLAG_OPEN_REPARSE_POINT
} else {
0
}
}
}
struct File {
handle: Handle,
}
impl File {
fn open(path: &Path, opts: &OpenOptions) -> io::Result<File> {
let path = to_u16s(path)?;
let handle = unsafe {
CreateFileW(
path.as_ptr(),
opts.get_access_mode()?,
opts.share_mode,
opts.security_attributes as *mut _,
opts.get_creation_mode()?,
opts.get_flags_and_attributes(),
ptr::null_mut(),
)
};
if handle == INVALID_HANDLE_VALUE {
Err(io::Error::last_os_error())
} else {
Ok(File {
handle: Handle::new(handle),
})
}
}
fn file_attr(&self) -> io::Result<FileAttr> {
unsafe {
let mut info: BY_HANDLE_FILE_INFORMATION = mem::zeroed();
cvt(GetFileInformationByHandle(self.handle.raw(), &mut info))?;
let mut attr = FileAttr {
attributes: info.dwFileAttributes,
creation_time: info.ftCreationTime,
last_access_time: info.ftLastAccessTime,
last_write_time: info.ftLastWriteTime,
file_size: ((info.nFileSizeHigh as u64) << 32) | (info.nFileSizeLow as u64),
reparse_tag: 0,
};
if attr.is_reparse_point() {
let mut b = [0; MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
if let Ok((_, buf)) = self.reparse_point(&mut b) {
attr.reparse_tag = buf.ReparseTag;
}
}
Ok(attr)
}
}
fn set_attributes(&self, attr: DWORD) -> io::Result<()> {
let zero: LARGE_INTEGER = unsafe { mem::zeroed() };
let mut info = FILE_BASIC_INFO {
CreationTime: zero, // do not change
LastAccessTime: zero, // do not change
LastWriteTime: zero, // do not change
ChangeTime: zero, // do not change
FileAttributes: attr,
};
let size = mem::size_of_val(&info);
cvt(unsafe {
SetFileInformationByHandle(
self.handle.raw(),
FileBasicInfo,
&mut info as *mut _ as *mut _,
size as DWORD,
)
})?;
Ok(())
}
fn rename(&self, new: &Path, replace: bool) -> io::Result<()> {
// &self must be opened with DELETE permission
use std::iter;
#[cfg(target_arch = "x86")]
const STRUCT_SIZE: usize = 12;
#[cfg(target_arch = "x86_64")]
const STRUCT_SIZE: usize = 20;
// FIXME: check for internal NULs in 'new'
let mut data: Vec<u16> = iter::repeat(0u16)
.take(STRUCT_SIZE / 2)
.chain(new.as_os_str().encode_wide())
.collect();
data.push(0);
let size = data.len() * 2;
unsafe {
// Thanks to alignment guarantees on Windows this works
// (8 for 32-bit and 16 for 64-bit)
let info = data.as_mut_ptr() as *mut FILE_RENAME_INFO;
// The type of ReplaceIfExists is BOOL, but it actually expects a
// BOOLEAN. This means true is -1, not c::TRUE.
(*info).ReplaceIfExists = if replace { -1 } else { FALSE };
(*info).RootDirectory = ptr::null_mut();
(*info).FileNameLength = (size - STRUCT_SIZE) as DWORD;
cvt(SetFileInformationByHandle(
self.handle().raw(),
FileRenameInfo,
data.as_mut_ptr() as *mut _ as *mut _,
size as DWORD,
))?;
Ok(())
}
}
fn set_perm(&self, perm: FilePermissions) -> io::Result<()> {
let attr = self.file_attr()?.attributes;
if perm.readonly == (attr & FILE_ATTRIBUTE_READONLY != 0) {
Ok(())
} else if perm.readonly {
self.set_attributes(attr | FILE_ATTRIBUTE_READONLY)
} else {
self.set_attributes(attr & !FILE_ATTRIBUTE_READONLY)
}
}
fn handle(&self) -> &Handle {
&self.handle
}
fn reparse_point<'a>(
&self,
space: &'a mut [u8; MAXIMUM_REPARSE_DATA_BUFFER_SIZE],
) -> io::Result<(DWORD, &'a REPARSE_DATA_BUFFER)> {
unsafe {
let mut bytes = 0;
cvt({
DeviceIoControl(
self.handle.raw(),
FSCTL_GET_REPARSE_POINT,
ptr::null_mut(),
0,
space.as_mut_ptr() as *mut _,
space.len() as DWORD,
&mut bytes,
ptr::null_mut(),
)
})?;
Ok((bytes, &*(space.as_ptr() as *const REPARSE_DATA_BUFFER)))
}
}
}
#[derive(Copy, Clone, PartialEq, Eq, Hash)]
enum FileType {
Dir,
File,
SymlinkFile,
SymlinkDir,
ReparsePoint,
MountPoint,
}
impl FileType {
fn new(attrs: DWORD, reparse_tag: DWORD) -> FileType {
match (
attrs & FILE_ATTRIBUTE_DIRECTORY != 0,
attrs & FILE_ATTRIBUTE_REPARSE_POINT != 0,
reparse_tag,
) {
(false, false, _) => FileType::File,
(true, false, _) => FileType::Dir,
(false, true, IO_REPARSE_TAG_SYMLINK) => FileType::SymlinkFile,
(true, true, IO_REPARSE_TAG_SYMLINK) => FileType::SymlinkDir,
(true, true, IO_REPARSE_TAG_MOUNT_POINT) => FileType::MountPoint,
(_, true, _) => FileType::ReparsePoint,
// Note: if a _file_ has a reparse tag of the type IO_REPARSE_TAG_MOUNT_POINT it is
// invalid, as junctions always have to be dirs. We set the filetype to ReparsePoint
// to indicate it is something symlink-like, but not something you can follow.
}
}
fn is_dir(&self) -> bool {
*self == FileType::Dir
}
fn is_symlink_dir(&self) -> bool {
*self == FileType::SymlinkDir || *self == FileType::MountPoint
}
}
impl DirEntry {
fn new(root: &Arc<PathBuf>, wfd: &WIN32_FIND_DATAW) -> Option<DirEntry> {
let first_bytes = &wfd.cFileName[0..3];
if first_bytes.starts_with(&[46, 0]) || first_bytes.starts_with(&[46, 46, 0]) {
None
} else {
Some(DirEntry {
root: root.clone(),
data: *wfd,
})
}
}
fn path(&self) -> PathBuf {
self.root.join(&self.file_name())
}
fn file_name(&self) -> OsString {
let filename = truncate_utf16_at_nul(&self.data.cFileName);
OsString::from_wide(filename)
}
fn file_type(&self) -> io::Result<FileType> {
Ok(FileType::new(
self.data.dwFileAttributes,
/* reparse_tag = */ self.data.dwReserved0,
))
}
fn metadata(&self) -> io::Result<FileAttr> {
Ok(FileAttr {
attributes: self.data.dwFileAttributes,
creation_time: self.data.ftCreationTime,
last_access_time: self.data.ftLastAccessTime,
last_write_time: self.data.ftLastWriteTime,
file_size: ((self.data.nFileSizeHigh as u64) << 32)
| (self.data.nFileSizeLow as u64),
reparse_tag: if self.data.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT != 0 {
// reserved unless this is a reparse point
self.data.dwReserved0
} else {
0
},
})
}
}
struct DirEntry {
root: Arc<PathBuf>,
data: WIN32_FIND_DATAW,
}
struct ReadDir {
handle: FindNextFileHandle,
root: Arc<PathBuf>,
first: Option<WIN32_FIND_DATAW>,
}
impl Iterator for ReadDir {
type Item = io::Result<DirEntry>;
fn next(&mut self) -> Option<io::Result<DirEntry>> {
if let Some(first) = self.first.take() {
if let Some(e) = DirEntry::new(&self.root, &first) {
return Some(Ok(e));
}
}
unsafe {
let mut wfd = mem::zeroed();
loop {
if FindNextFileW(self.handle.0, &mut wfd) == 0 {
if GetLastError() == ERROR_NO_MORE_FILES {
return None;
} else {
return Some(Err(io::Error::last_os_error()));
}
}
if let Some(e) = DirEntry::new(&self.root, &wfd) {
return Some(Ok(e));
}
}
}
}
}
#[derive(Clone)]
struct FileAttr {
attributes: DWORD,
creation_time: FILETIME,
last_access_time: FILETIME,
last_write_time: FILETIME,
file_size: u64,
reparse_tag: DWORD,
}
impl FileAttr {
fn perm(&self) -> FilePermissions {
FilePermissions {
readonly: self.attributes & FILE_ATTRIBUTE_READONLY != 0,
}
}
fn file_type(&self) -> FileType {
FileType::new(self.attributes, self.reparse_tag)
}
fn is_reparse_point(&self) -> bool {
self.attributes & FILE_ATTRIBUTE_REPARSE_POINT != 0
}
}
#[repr(C)]
struct REPARSE_DATA_BUFFER {
ReparseTag: c_uint,
ReparseDataLength: c_ushort,
Reserved: c_ushort,
rest: (),
}
const MAXIMUM_REPARSE_DATA_BUFFER_SIZE: usize = 16 * 1024;
/// An owned container for `HANDLE` object, closing them on Drop.
///
/// All methods are inherited through a `Deref` impl to `RawHandle`
struct Handle(RawHandle);
use std::ops::Deref;
/// A wrapper type for `HANDLE` objects to give them proper Send/Sync inference
/// as well as Rust-y methods.
///
/// This does **not** drop the handle when it goes out of scope, use `Handle`
/// instead for that.
#[derive(Copy, Clone)]
struct RawHandle(HANDLE);
unsafe impl Send for RawHandle {}
unsafe impl Sync for RawHandle {}
impl Handle {
fn new(handle: HANDLE) -> Handle {
Handle(RawHandle::new(handle))
}
}
impl Deref for Handle {
type Target = RawHandle;
fn deref(&self) -> &RawHandle {
&self.0
}
}
impl Drop for Handle {
fn drop(&mut self) {
unsafe {
let _ = CloseHandle(self.raw());
}
}
}
impl RawHandle {
fn new(handle: HANDLE) -> RawHandle {
RawHandle(handle)
}
fn raw(&self) -> HANDLE {
self.0
}
}
struct FindNextFileHandle(HANDLE);
fn get_path(f: &File) -> io::Result<PathBuf> {
fill_utf16_buf(
|buf, sz| unsafe {
GetFinalPathNameByHandleW(f.handle.raw(), buf, sz, VOLUME_NAME_DOS)
},
|buf| PathBuf::from(OsString::from_wide(buf)),
)
}
fn move_item(file: &File, ctx: &mut RmdirContext) -> io::Result<()> {
let mut tmpname = ctx.base_dir.join(format! {"rm-{}", ctx.counter});
ctx.counter += 1;
// Try to rename the file. If it already exists, just retry with an other
// filename.
while let Err(err) = file.rename(tmpname.as_ref(), false) {
if err.kind() != io::ErrorKind::AlreadyExists {
return Err(err);
};
tmpname = ctx.base_dir.join(format!("rm-{}", ctx.counter));
ctx.counter += 1;
}
Ok(())
}
fn set_perm(path: &Path, perm: FilePermissions) -> io::Result<()> {
let mut opts = OpenOptions::new();
opts.access_mode(FILE_READ_ATTRIBUTES | FILE_WRITE_ATTRIBUTES);
opts.custom_flags(FILE_FLAG_BACKUP_SEMANTICS);
let file = File::open(path, &opts)?;
file.set_perm(perm)
}
const VOLUME_NAME_DOS: DWORD = 0x0;
}