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fs.rs
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fs.rs
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use crate::os::unix::prelude::*;
use crate::ffi::{OsString, OsStr};
use crate::fmt;
use crate::io::{self, Error, SeekFrom};
use crate::path::{Path, PathBuf};
use crate::sync::Arc;
use crate::sys::fd::FileDesc;
use crate::sys::time::SystemTime;
use crate::sys::{cvt, syscall};
use crate::sys_common::{AsInner, FromInner};
pub use crate::sys_common::fs::copy;
pub use crate::sys_common::fs::remove_dir_all;
pub struct File(FileDesc);
#[derive(Clone)]
pub struct FileAttr {
stat: syscall::Stat,
}
pub struct ReadDir {
data: Vec<u8>,
i: usize,
root: Arc<PathBuf>,
}
struct Dir(FileDesc);
unsafe impl Send for Dir {}
unsafe impl Sync for Dir {}
pub struct DirEntry {
root: Arc<PathBuf>,
name: Box<[u8]>
}
#[derive(Clone, Debug)]
pub struct OpenOptions {
// generic
read: bool,
write: bool,
append: bool,
truncate: bool,
create: bool,
create_new: bool,
// system-specific
custom_flags: i32,
mode: u16,
}
#[derive(Clone, PartialEq, Eq, Debug)]
pub struct FilePermissions { mode: u16 }
#[derive(Copy, Clone, PartialEq, Eq, Hash, Debug)]
pub struct FileType { mode: u16 }
#[derive(Debug)]
pub struct DirBuilder { mode: u16 }
impl FileAttr {
pub fn size(&self) -> u64 { self.stat.st_size as u64 }
pub fn perm(&self) -> FilePermissions {
FilePermissions { mode: (self.stat.st_mode as u16) & 0o777 }
}
pub fn file_type(&self) -> FileType {
FileType { mode: self.stat.st_mode as u16 }
}
}
impl FileAttr {
pub fn modified(&self) -> io::Result<SystemTime> {
Ok(SystemTime::from(syscall::TimeSpec {
tv_sec: self.stat.st_mtime as i64,
tv_nsec: self.stat.st_mtime_nsec as i32,
}))
}
pub fn accessed(&self) -> io::Result<SystemTime> {
Ok(SystemTime::from(syscall::TimeSpec {
tv_sec: self.stat.st_atime as i64,
tv_nsec: self.stat.st_atime_nsec as i32,
}))
}
pub fn created(&self) -> io::Result<SystemTime> {
Ok(SystemTime::from(syscall::TimeSpec {
tv_sec: self.stat.st_ctime as i64,
tv_nsec: self.stat.st_ctime_nsec as i32,
}))
}
}
impl AsInner<syscall::Stat> for FileAttr {
fn as_inner(&self) -> &syscall::Stat { &self.stat }
}
impl FilePermissions {
pub fn readonly(&self) -> bool { self.mode & 0o222 == 0 }
pub fn set_readonly(&mut self, readonly: bool) {
if readonly {
self.mode &= !0o222;
} else {
self.mode |= 0o222;
}
}
pub fn mode(&self) -> u32 { self.mode as u32 }
}
impl FileType {
pub fn is_dir(&self) -> bool { self.is(syscall::MODE_DIR) }
pub fn is_file(&self) -> bool { self.is(syscall::MODE_FILE) }
pub fn is_symlink(&self) -> bool { self.is(syscall::MODE_SYMLINK) }
pub fn is(&self, mode: u16) -> bool {
self.mode & syscall::MODE_TYPE == mode
}
}
impl FromInner<u32> for FilePermissions {
fn from_inner(mode: u32) -> FilePermissions {
FilePermissions { mode: mode as u16 }
}
}
impl fmt::Debug for ReadDir {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
// This will only be called from std::fs::ReadDir, which will add a "ReadDir()" frame.
// Thus the result will be e g 'ReadDir("/home")'
fmt::Debug::fmt(&*self.root, f)
}
}
impl Iterator for ReadDir {
type Item = io::Result<DirEntry>;
fn next(&mut self) -> Option<io::Result<DirEntry>> {
loop {
let start = self.i;
let mut i = self.i;
while i < self.data.len() {
self.i += 1;
if self.data[i] == b'\n' {
break;
}
i += 1;
}
if start < self.i {
let ret = DirEntry {
name: self.data[start .. i].to_owned().into_boxed_slice(),
root: self.root.clone()
};
if ret.name_bytes() != b"." && ret.name_bytes() != b".." {
return Some(Ok(ret))
}
} else {
return None;
}
}
}
}
impl DirEntry {
pub fn path(&self) -> PathBuf {
self.root.join(OsStr::from_bytes(self.name_bytes()))
}
pub fn file_name(&self) -> OsString {
OsStr::from_bytes(self.name_bytes()).to_os_string()
}
pub fn metadata(&self) -> io::Result<FileAttr> {
lstat(&self.path())
}
pub fn file_type(&self) -> io::Result<FileType> {
lstat(&self.path()).map(|m| m.file_type())
}
fn name_bytes(&self) -> &[u8] {
&*self.name
}
}
impl OpenOptions {
pub fn new() -> OpenOptions {
OpenOptions {
// generic
read: false,
write: false,
append: false,
truncate: false,
create: false,
create_new: false,
// system-specific
custom_flags: 0,
mode: 0o666,
}
}
pub fn read(&mut self, read: bool) { self.read = read; }
pub fn write(&mut self, write: bool) { self.write = write; }
pub fn append(&mut self, append: bool) { self.append = append; }
pub fn truncate(&mut self, truncate: bool) { self.truncate = truncate; }
pub fn create(&mut self, create: bool) { self.create = create; }
pub fn create_new(&mut self, create_new: bool) { self.create_new = create_new; }
pub fn custom_flags(&mut self, flags: i32) { self.custom_flags = flags; }
pub fn mode(&mut self, mode: u32) { self.mode = mode as u16; }
fn get_access_mode(&self) -> io::Result<usize> {
match (self.read, self.write, self.append) {
(true, false, false) => Ok(syscall::O_RDONLY),
(false, true, false) => Ok(syscall::O_WRONLY),
(true, true, false) => Ok(syscall::O_RDWR),
(false, _, true) => Ok(syscall::O_WRONLY | syscall::O_APPEND),
(true, _, true) => Ok(syscall::O_RDWR | syscall::O_APPEND),
(false, false, false) => Err(Error::from_raw_os_error(syscall::EINVAL)),
}
}
fn get_creation_mode(&self) -> io::Result<usize> {
match (self.write, self.append) {
(true, false) => {}
(false, false) =>
if self.truncate || self.create || self.create_new {
return Err(Error::from_raw_os_error(syscall::EINVAL));
},
(_, true) =>
if self.truncate && !self.create_new {
return Err(Error::from_raw_os_error(syscall::EINVAL));
},
}
Ok(match (self.create, self.truncate, self.create_new) {
(false, false, false) => 0,
(true, false, false) => syscall::O_CREAT,
(false, true, false) => syscall::O_TRUNC,
(true, true, false) => syscall::O_CREAT | syscall::O_TRUNC,
(_, _, true) => syscall::O_CREAT | syscall::O_EXCL,
})
}
}
impl File {
pub fn open(path: &Path, opts: &OpenOptions) -> io::Result<File> {
let flags = syscall::O_CLOEXEC |
opts.get_access_mode()? as usize |
opts.get_creation_mode()? as usize |
(opts.custom_flags as usize & !syscall::O_ACCMODE);
let fd = cvt(syscall::open(path.to_str().unwrap(), flags | opts.mode as usize))?;
Ok(File(FileDesc::new(fd)))
}
pub fn file_attr(&self) -> io::Result<FileAttr> {
let mut stat = syscall::Stat::default();
cvt(syscall::fstat(self.0.raw(), &mut stat))?;
Ok(FileAttr { stat })
}
pub fn fsync(&self) -> io::Result<()> {
cvt(syscall::fsync(self.0.raw()))?;
Ok(())
}
pub fn datasync(&self) -> io::Result<()> {
self.fsync()
}
pub fn truncate(&self, size: u64) -> io::Result<()> {
cvt(syscall::ftruncate(self.0.raw(), size as usize))?;
Ok(())
}
pub fn read(&self, buf: &mut [u8]) -> io::Result<usize> {
self.0.read(buf)
}
pub fn write(&self, buf: &[u8]) -> io::Result<usize> {
self.0.write(buf)
}
pub fn flush(&self) -> io::Result<()> { Ok(()) }
pub fn seek(&self, pos: SeekFrom) -> io::Result<u64> {
let (whence, pos) = match pos {
// Casting to `i64` is fine, too large values will end up as
// negative which will cause an error in `lseek64`.
SeekFrom::Start(off) => (syscall::SEEK_SET, off as i64),
SeekFrom::End(off) => (syscall::SEEK_END, off),
SeekFrom::Current(off) => (syscall::SEEK_CUR, off),
};
let n = cvt(syscall::lseek(self.0.raw(), pos as isize, whence))?;
Ok(n as u64)
}
pub fn duplicate(&self) -> io::Result<File> {
self.0.duplicate().map(File)
}
pub fn dup(&self, buf: &[u8]) -> io::Result<File> {
let fd = cvt(syscall::dup(*self.fd().as_inner() as usize, buf))?;
Ok(File(FileDesc::new(fd)))
}
pub fn set_permissions(&self, perm: FilePermissions) -> io::Result<()> {
set_perm(&self.path()?, perm)
}
pub fn path(&self) -> io::Result<PathBuf> {
let mut buf: [u8; 4096] = [0; 4096];
let count = cvt(syscall::fpath(*self.fd().as_inner() as usize, &mut buf))?;
Ok(PathBuf::from(unsafe { String::from_utf8_unchecked(Vec::from(&buf[..count])) }))
}
pub fn fd(&self) -> &FileDesc { &self.0 }
pub fn into_fd(self) -> FileDesc { self.0 }
}
impl DirBuilder {
pub fn new() -> DirBuilder {
DirBuilder { mode: 0o777 }
}
pub fn mkdir(&self, p: &Path) -> io::Result<()> {
let flags = syscall::O_CREAT | syscall::O_CLOEXEC | syscall::O_DIRECTORY | syscall::O_EXCL;
let fd = cvt(syscall::open(p.to_str().unwrap(), flags | (self.mode as usize & 0o777)))?;
let _ = syscall::close(fd);
Ok(())
}
pub fn set_mode(&mut self, mode: u32) {
self.mode = mode as u16;
}
}
impl FromInner<usize> for File {
fn from_inner(fd: usize) -> File {
File(FileDesc::new(fd))
}
}
impl fmt::Debug for File {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
let mut b = f.debug_struct("File");
b.field("fd", &self.0.raw());
if let Ok(path) = self.path() {
b.field("path", &path);
}
/*
if let Some((read, write)) = get_mode(fd) {
b.field("read", &read).field("write", &write);
}
*/
b.finish()
}
}
pub fn readdir(p: &Path) -> io::Result<ReadDir> {
let root = Arc::new(p.to_path_buf());
let flags = syscall::O_CLOEXEC | syscall::O_RDONLY | syscall::O_DIRECTORY;
let fd = cvt(syscall::open(p.to_str().unwrap(), flags))?;
let file = FileDesc::new(fd);
let mut data = Vec::new();
file.read_to_end(&mut data)?;
Ok(ReadDir { data: data, i: 0, root: root })
}
pub fn unlink(p: &Path) -> io::Result<()> {
cvt(syscall::unlink(p.to_str().unwrap()))?;
Ok(())
}
pub fn rename(old: &Path, new: &Path) -> io::Result<()> {
let fd = cvt(syscall::open(old.to_str().unwrap(),
syscall::O_CLOEXEC | syscall::O_STAT | syscall::O_NOFOLLOW))?;
let res = cvt(syscall::frename(fd, new.to_str().unwrap()));
cvt(syscall::close(fd))?;
res?;
Ok(())
}
pub fn set_perm(p: &Path, perm: FilePermissions) -> io::Result<()> {
cvt(syscall::chmod(p.to_str().unwrap(), perm.mode as usize))?;
Ok(())
}
pub fn rmdir(p: &Path) -> io::Result<()> {
cvt(syscall::rmdir(p.to_str().unwrap()))?;
Ok(())
}
pub fn readlink(p: &Path) -> io::Result<PathBuf> {
let fd = cvt(syscall::open(p.to_str().unwrap(),
syscall::O_CLOEXEC | syscall::O_SYMLINK | syscall::O_RDONLY))?;
let mut buf: [u8; 4096] = [0; 4096];
let res = cvt(syscall::read(fd, &mut buf));
cvt(syscall::close(fd))?;
let count = res?;
Ok(PathBuf::from(unsafe { String::from_utf8_unchecked(Vec::from(&buf[..count])) }))
}
pub fn symlink(src: &Path, dst: &Path) -> io::Result<()> {
let fd = cvt(syscall::open(dst.to_str().unwrap(),
syscall::O_CLOEXEC | syscall::O_SYMLINK |
syscall::O_CREAT | syscall::O_WRONLY | 0o777))?;
let res = cvt(syscall::write(fd, src.to_str().unwrap().as_bytes()));
cvt(syscall::close(fd))?;
res?;
Ok(())
}
pub fn link(_src: &Path, _dst: &Path) -> io::Result<()> {
Err(Error::from_raw_os_error(syscall::ENOSYS))
}
pub fn stat(p: &Path) -> io::Result<FileAttr> {
let fd = cvt(syscall::open(p.to_str().unwrap(), syscall::O_CLOEXEC | syscall::O_STAT))?;
let file = File(FileDesc::new(fd));
file.file_attr()
}
pub fn lstat(p: &Path) -> io::Result<FileAttr> {
let fd = cvt(syscall::open(p.to_str().unwrap(),
syscall::O_CLOEXEC | syscall::O_STAT | syscall::O_NOFOLLOW))?;
let file = File(FileDesc::new(fd));
file.file_attr()
}
pub fn canonicalize(p: &Path) -> io::Result<PathBuf> {
let fd = cvt(syscall::open(p.to_str().unwrap(), syscall::O_CLOEXEC | syscall::O_STAT))?;
let file = File(FileDesc::new(fd));
file.path()
}