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Merge pull request #3920 from wasmerio/fs-union-fix
Fix filesystem access when running python with `wasmer run-unstable .`
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,103 @@ | ||
| //! Used for /dev/zero - infinitely returns zero | ||
| //! which is useful for commands like `dd if=/dev/zero of=bigfile.img size=1G` | ||
| use std::io::{self, *}; | ||
| use std::pin::Pin; | ||
| use std::task::{Context, Poll}; | ||
|
|
||
| use tokio::io::{AsyncRead, AsyncSeek, AsyncWrite}; | ||
|
|
||
| use crate::VirtualFile; | ||
|
|
||
| #[derive(Debug, Default)] | ||
| pub struct BufferFile { | ||
| pub(crate) data: Cursor<Vec<u8>>, | ||
| } | ||
|
|
||
| impl AsyncSeek for BufferFile { | ||
| fn start_seek(mut self: Pin<&mut Self>, position: io::SeekFrom) -> io::Result<()> { | ||
| let data = Pin::new(&mut self.data); | ||
| data.start_seek(position) | ||
| } | ||
|
|
||
| fn poll_complete(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<u64>> { | ||
| let data = Pin::new(&mut self.data); | ||
| data.poll_complete(cx) | ||
| } | ||
| } | ||
|
|
||
| impl AsyncWrite for BufferFile { | ||
| fn poll_write( | ||
| mut self: Pin<&mut Self>, | ||
| cx: &mut Context<'_>, | ||
| buf: &[u8], | ||
| ) -> Poll<io::Result<usize>> { | ||
| let data = Pin::new(&mut self.data); | ||
| data.poll_write(cx, buf) | ||
| } | ||
|
|
||
| fn poll_write_vectored( | ||
| mut self: Pin<&mut Self>, | ||
| cx: &mut Context<'_>, | ||
| bufs: &[io::IoSlice<'_>], | ||
| ) -> Poll<io::Result<usize>> { | ||
| let data = Pin::new(&mut self.data); | ||
| data.poll_write_vectored(cx, bufs) | ||
| } | ||
|
|
||
| fn poll_flush(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<()>> { | ||
| let data = Pin::new(&mut self.data); | ||
| data.poll_flush(cx) | ||
| } | ||
|
|
||
| fn poll_shutdown(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<()>> { | ||
| let data = Pin::new(&mut self.data); | ||
| data.poll_shutdown(cx) | ||
| } | ||
| } | ||
|
|
||
| impl AsyncRead for BufferFile { | ||
| fn poll_read( | ||
| mut self: Pin<&mut Self>, | ||
| cx: &mut Context<'_>, | ||
| buf: &mut tokio::io::ReadBuf<'_>, | ||
| ) -> Poll<io::Result<()>> { | ||
| let data = Pin::new(&mut self.data); | ||
| data.poll_read(cx, buf) | ||
| } | ||
| } | ||
|
|
||
| impl VirtualFile for BufferFile { | ||
| fn last_accessed(&self) -> u64 { | ||
| 0 | ||
| } | ||
| fn last_modified(&self) -> u64 { | ||
| 0 | ||
| } | ||
| fn created_time(&self) -> u64 { | ||
| 0 | ||
| } | ||
| fn size(&self) -> u64 { | ||
| self.data.get_ref().len() as u64 | ||
| } | ||
| fn set_len(&mut self, new_size: u64) -> crate::Result<()> { | ||
| self.data.get_mut().resize(new_size as usize, 0); | ||
| Ok(()) | ||
| } | ||
| fn unlink(&mut self) -> crate::Result<()> { | ||
| Ok(()) | ||
| } | ||
| fn poll_read_ready(mut self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll<io::Result<usize>> { | ||
| let cur = self.data.stream_position().unwrap_or_default(); | ||
| let len = self.data.seek(SeekFrom::End(0)).unwrap_or_default(); | ||
| if cur < len { | ||
| Poll::Ready(Ok((len - cur) as usize)) | ||
| } else { | ||
| Poll::Ready(Ok(0)) | ||
| } | ||
| } | ||
|
|
||
| fn poll_write_ready(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll<io::Result<usize>> { | ||
| Poll::Ready(Ok(8192)) | ||
| } | ||
| } |
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