1 files changed, 39 insertions, 0 deletions
diff --git a/library/std/src/sys_common/fs.rs b/library/std/src/sys_common/fs.rs
new file mode 100644
index 00000000000..e30e8018a31
--- /dev/null
+++ b/library/std/src/sys_common/fs.rs
@@ -0,0 +1,39 @@
+#![allow(dead_code)] // not used on all platforms
+
+use crate::fs;
+use crate::io::{self, Error, ErrorKind};
+use crate::path::Path;
+
+pub fn copy(from: &Path, to: &Path) -> io::Result<u64> {
+    if !from.is_file() {
+        return Err(Error::new(
+            ErrorKind::InvalidInput,
+            "the source path is not an existing regular file",
+        ));
+    }
+
+    let mut reader = fs::File::open(from)?;
+    let mut writer = fs::File::create(to)?;
+    let perm = reader.metadata()?.permissions();
+
+    let ret = io::copy(&mut reader, &mut writer)?;
+    fs::set_permissions(to, perm)?;
+    Ok(ret)
+}
+
+pub fn remove_dir_all(path: &Path) -> io::Result<()> {
+    let filetype = fs::symlink_metadata(path)?.file_type();
+    if filetype.is_symlink() { fs::remove_file(path) } else { remove_dir_all_recursive(path) }
+}
+
+fn remove_dir_all_recursive(path: &Path) -> io::Result<()> {
+    for child in fs::read_dir(path)? {
+        let child = child?;
+        if child.file_type()?.is_dir() {
+            remove_dir_all_recursive(&child.path())?;
+        } else {
+            fs::remove_file(&child.path())?;
+        }
+    }
+    fs::remove_dir(path)
+}