Crate openat[−][src]
Handling Files Relative to File Descriptor
Main concept here is a Dir
which holds O_PATH
file descriptor, you
can create it with:
Dir::open("/some/path")
– open this directory as a file descriptorDir::from_raw_fd(fd)
– uses a file descriptor provided elsewhere
Note after opening file descriptors refer to same directory regardless of
where it’s moved or mounted (with pivot_root
or mount --move
). It may
also be unmounted or be out of chroot and you will still be able to
access files relative to it.
Note2: The constructor Dir::cwd()
is deprecated, and it’s recommended
to use Dir::open(".")
instead.
Note3: Some OS’s (e.g., macOS) do not provide O_PATH
, in which case the
file descriptor is of regular type.
Most other operations are done on Dir
object and are executed relative
to it:
Dir::list_dir()
Dir::sub_dir()
Dir::read_link()
Dir::open_file()
Dir::create_file()
Dir::update_file()
Dir::create_dir()
Dir::symlink()
Dir::local_rename()
Functions that expect path relative to the directory accept both the
traditional path-like objects, such as Path, PathBuf and &str, and
Entry
type returned from list_dir()
. The latter is faster as underlying
system call wants CString
and we keep that in entry.
Note that if path supplied to any method of dir is absolute the Dir file descriptor is ignored.
Also while all methods of dir accept any path if you want to prevent certain symlink attacks and race condition you should only use a single-component path. I.e. open one part of a chain at a time.
Structs
Dir | A safe wrapper around directory file descriptor |
DirIter | Iterator over directory entries |
Entry | Entry returned by iterating over |
Metadata | A file metadata |
Enums
SimpleType | This is a simplified file type enum that is easy to match |
Traits
AsPath | The purpose of this is similar to |
Functions
hardlink | Create a hardlink to a file |
rename | Rename (move) a file between directories |