alnyan/yggdrasil: implement fs::copy() + OpenOptionsExt

library/std/src/os/yggdrasil/fs.rs

@@ -2,8 +2,8 @@
 
 use yggdrasil_rt::io::FileMode;
 
-use crate::fs::Metadata;
-use crate::sys_common::AsInner;
+use crate::fs::{Metadata, OpenOptions};
+use crate::sys_common::{AsInner, AsInnerMut};
 
 #[unstable(feature = "yggdrasil_os", issue = "none")]
 pub trait MetadataExt {
@@ -13,6 +13,11 @@ pub trait MetadataExt {
     fn block_size(&self) -> u64;
 }
 
+#[unstable(feature = "yggdrasil_os", issue = "none")]
+pub trait OpenOptionsExt {
+    fn mode_ext(&mut self, mode: FileMode) -> &mut Self;
+}
+
 impl MetadataExt for Metadata {
     fn mode_ext(&self) -> FileMode {
         self.as_inner().mode_ext()
@@ -30,3 +35,10 @@ impl MetadataExt for Metadata {
         self.as_inner().block_size()
     }
 }
+
+impl OpenOptionsExt for OpenOptions {
+    fn mode_ext(&mut self, mode: FileMode) -> &mut Self {
+        self.as_inner_mut().mode = mode;
+        self
+    }
+}

library/std/src/sys/pal/yggdrasil/fs/file.rs

@@ -18,8 +18,8 @@ pub struct File(FileDesc);
 
 #[derive(Clone, Copy, Debug)]
 pub struct OpenOptions {
-    options: OsOpenOptions,
-    mode: OsFileMode,
+    pub(crate) options: OsOpenOptions,
+    pub(crate) mode: OsFileMode,
 }
 
 impl OpenOptions {

library/std/src/sys/pal/yggdrasil/fs/mod.rs

@@ -5,6 +5,7 @@ use yggdrasil_rt::io::{
 use yggdrasil_rt::time::SystemTime as RtSystemTime;
 
 use crate::hash::Hash;
+use crate::os::yggdrasil::fs::{MetadataExt, OpenOptionsExt};
 use crate::path::{Path, PathBuf};
 use crate::sys::time::SystemTime;
 use crate::sys::{cvt_io, run_with_path_str};
@@ -195,8 +196,18 @@ pub fn canonicalize(_p: &Path) -> io::Result<PathBuf> {
     todo!()
 }
 
-pub fn copy(_from: &Path, _to: &Path) -> io::Result<u64> {
-    todo!()
+pub fn copy(from: &Path, to: &Path) -> io::Result<u64> {
+    let src_stat = from.metadata()?;
+    let raw_mode = src_stat.mode_ext();
+    let mut src = crate::fs::File::open(from)?;
+    let mut dst = crate::fs::OpenOptions::new()
+        .write(true)
+        .truncate(true)
+        .create(true)
+        .mode_ext(raw_mode)
+        .open(to)?;
+
+    crate::io::copy(&mut src, &mut dst)
 }
 
 pub fn try_exists(_path: &Path) -> io::Result<bool> {

library/std/src/sys/pal/yggdrasil/mod.rs

@@ -79,6 +79,7 @@ pub fn decode_error_kind(errno: i32) -> ErrorKind {
         Ok(OsError::WouldBlock) => ErrorKind::WouldBlock,
         Ok(OsError::ReadOnly) => ErrorKind::ReadOnlyFilesystem,
         Ok(OsError::PermissionDenied) => ErrorKind::PermissionDenied,
+        Ok(OsError::CrossDeviceLink) => ErrorKind::CrossesDevices,
         Ok(OsError::UnrecognizedExecutable)
         | Ok(OsError::MissingData)
         | Ok(OsError::BufferTooSmall)