move wasi-c2 into wasi-common
This commit is contained in:
Pat Hickey
249
crates/wasi-common/cap-std-sync/src/dir.rs
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249
crates/wasi-common/cap-std-sync/src/dir.rs
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@@ -0,0 +1,249 @@
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use crate::file::{filetype_from, File};
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use cap_fs_ext::{DirExt, MetadataExt, SystemTimeSpec};
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use std::any::Any;
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use std::convert::TryInto;
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use std::path::{Path, PathBuf};
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use wasi_c2::{
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dir::{ReaddirCursor, ReaddirEntity, WasiDir},
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file::{FdFlags, FileCaps, FileType, Filestat, OFlags, WasiFile},
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Error, ErrorExt,
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};
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pub struct Dir(cap_std::fs::Dir);
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impl Dir {
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pub fn from_cap_std(dir: cap_std::fs::Dir) -> Self {
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Dir(dir)
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}
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}
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impl WasiDir for Dir {
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fn as_any(&self) -> &dyn Any {
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self
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}
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fn open_file(
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&self,
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symlink_follow: bool,
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path: &str,
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oflags: OFlags,
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caps: FileCaps,
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fdflags: FdFlags,
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) -> Result<Box<dyn WasiFile>, Error> {
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use cap_fs_ext::{FollowSymlinks, OpenOptionsFollowExt};
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let mut opts = cap_std::fs::OpenOptions::new();
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if oflags.contains(OFlags::CREATE | OFlags::EXCLUSIVE) {
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opts.create_new(true);
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opts.write(true);
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} else if oflags.contains(OFlags::CREATE) {
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opts.create(true);
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opts.write(true);
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}
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if oflags.contains(OFlags::TRUNCATE) {
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opts.truncate(true);
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}
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if caps.contains(FileCaps::WRITE)
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|| caps.contains(FileCaps::DATASYNC)
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|| caps.contains(FileCaps::ALLOCATE)
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|| caps.contains(FileCaps::FILESTAT_SET_SIZE)
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{
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opts.write(true);
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} else {
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// If not opened write, open read. This way the OS lets us open the file.
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// If FileCaps::READ is not set, read calls will be rejected at the
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// get_cap check.
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opts.read(true);
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}
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if caps.contains(FileCaps::READ) {
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opts.read(true);
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}
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if fdflags.contains(FdFlags::APPEND) {
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opts.append(true);
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}
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// XXX what about rest of fdflags - dsync, sync become oflags.
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// what do we do with nonblock?
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// what do we do with rsync?
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if symlink_follow {
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opts.follow(FollowSymlinks::Yes);
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} else {
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opts.follow(FollowSymlinks::No);
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}
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let f = self.0.open_with(Path::new(path), &opts)?;
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Ok(Box::new(File::from_cap_std(f)))
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}
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fn open_dir(&self, symlink_follow: bool, path: &str) -> Result<Box<dyn WasiDir>, Error> {
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let d = if symlink_follow {
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self.0.open_dir(Path::new(path))?
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} else {
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self.0.open_dir_nofollow(Path::new(path))?
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};
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Ok(Box::new(Dir::from_cap_std(d)))
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}
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fn create_dir(&self, path: &str) -> Result<(), Error> {
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self.0.create_dir(Path::new(path))?;
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Ok(())
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}
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fn readdir(
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&self,
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cursor: ReaddirCursor,
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) -> Result<Box<dyn Iterator<Item = Result<(ReaddirEntity, String), Error>>>, Error> {
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// cap_std's read_dir does not include . and .., we should prepend these.
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// Why does the Ok contain a tuple? We can't construct a cap_std::fs::DirEntry, and we don't
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// have enough info to make a ReaddirEntity yet.
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let dir_meta = self.0.dir_metadata()?;
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let rd = vec![
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{
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let name = ".".to_owned();
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let namelen = name.as_bytes().len().try_into().expect("1 wont overflow");
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Ok((FileType::Directory, dir_meta.ino(), namelen, name))
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},
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{
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// XXX if parent dir is mounted it *might* be possible to give its inode, but we
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// don't know that in this context.
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let name = "..".to_owned();
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let namelen = name.as_bytes().len().try_into().expect("2 wont overflow");
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Ok((FileType::Directory, dir_meta.ino(), namelen, name))
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},
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]
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.into_iter()
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.chain(
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// Now process the `DirEntry`s:
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self.0.entries()?.map(|entry| {
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let entry = entry?;
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let meta = entry.metadata()?;
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let inode = meta.ino();
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let filetype = filetype_from(&meta.file_type());
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let name = entry
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.file_name()
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.into_string()
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.map_err(|_| Error::illegal_byte_sequence().context("filename"))?;
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let namelen = name.as_bytes().len().try_into()?;
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Ok((filetype, inode, namelen, name))
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}),
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)
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// Enumeration of the iterator makes it possible to define the ReaddirCursor
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.enumerate()
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.map(|(ix, r)| match r {
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Ok((filetype, inode, namelen, name)) => Ok((
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ReaddirEntity {
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next: ReaddirCursor::from(ix as u64 + 1),
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filetype,
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inode,
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namelen,
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},
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name,
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)),
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Err(e) => Err(e),
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})
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.skip(u64::from(cursor) as usize);
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Ok(Box::new(rd))
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}
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fn symlink(&self, src_path: &str, dest_path: &str) -> Result<(), Error> {
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self.0.symlink(src_path, dest_path)?;
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Ok(())
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}
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fn remove_dir(&self, path: &str) -> Result<(), Error> {
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self.0.remove_dir(Path::new(path))?;
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Ok(())
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}
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fn unlink_file(&self, path: &str) -> Result<(), Error> {
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self.0.remove_file(Path::new(path))?;
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Ok(())
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}
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fn read_link(&self, path: &str) -> Result<PathBuf, Error> {
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let link = self.0.read_link(Path::new(path))?;
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Ok(link)
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}
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fn get_filestat(&self) -> Result<Filestat, Error> {
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let meta = self.0.dir_metadata()?;
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Ok(Filestat {
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device_id: meta.dev(),
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inode: meta.ino(),
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filetype: filetype_from(&meta.file_type()),
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nlink: meta.nlink(),
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size: meta.len(),
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atim: meta.accessed().map(|t| Some(t.into_std())).unwrap_or(None),
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mtim: meta.modified().map(|t| Some(t.into_std())).unwrap_or(None),
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ctim: meta.created().map(|t| Some(t.into_std())).unwrap_or(None),
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})
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}
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fn get_path_filestat(&self, path: &str, follow_symlinks: bool) -> Result<Filestat, Error> {
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let meta = if follow_symlinks {
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self.0.metadata(Path::new(path))?
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} else {
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self.0.symlink_metadata(Path::new(path))?
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};
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Ok(Filestat {
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device_id: meta.dev(),
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inode: meta.ino(),
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filetype: filetype_from(&meta.file_type()),
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nlink: meta.nlink(),
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size: meta.len(),
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atim: meta.accessed().map(|t| Some(t.into_std())).unwrap_or(None),
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mtim: meta.modified().map(|t| Some(t.into_std())).unwrap_or(None),
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ctim: meta.created().map(|t| Some(t.into_std())).unwrap_or(None),
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})
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}
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fn rename(&self, src_path: &str, dest_dir: &dyn WasiDir, dest_path: &str) -> Result<(), Error> {
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let dest_dir = dest_dir
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.as_any()
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.downcast_ref::<Self>()
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.ok_or(Error::badf().context("failed downcast to cap-std Dir"))?;
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self.0
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.rename(Path::new(src_path), &dest_dir.0, Path::new(dest_path))?;
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Ok(())
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}
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fn hard_link(
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&self,
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src_path: &str,
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target_dir: &dyn WasiDir,
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target_path: &str,
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) -> Result<(), Error> {
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let target_dir = target_dir
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.as_any()
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.downcast_ref::<Self>()
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.ok_or(Error::badf().context("failed downcast to cap-std Dir"))?;
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let src_path = Path::new(src_path);
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let target_path = Path::new(target_path);
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self.0.hard_link(src_path, &target_dir.0, target_path)?;
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Ok(())
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}
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fn set_times(
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&self,
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path: &str,
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atime: Option<wasi_c2::SystemTimeSpec>,
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mtime: Option<wasi_c2::SystemTimeSpec>,
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follow_symlinks: bool,
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) -> Result<(), Error> {
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if follow_symlinks {
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self.0.set_times(
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Path::new(path),
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convert_systimespec(atime),
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convert_systimespec(mtime),
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)?;
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} else {
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self.0.set_symlink_times(
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Path::new(path),
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convert_systimespec(atime),
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convert_systimespec(mtime),
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)?;
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}
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Ok(())
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}
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}
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fn convert_systimespec(t: Option<wasi_c2::SystemTimeSpec>) -> Option<SystemTimeSpec> {
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match t {
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Some(wasi_c2::SystemTimeSpec::Absolute(t)) => Some(SystemTimeSpec::Absolute(t)),
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Some(wasi_c2::SystemTimeSpec::SymbolicNow) => Some(SystemTimeSpec::SymbolicNow),
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None => None,
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}
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}
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