rust/tests/run-pass/fs.rs
2020-02-17 22:24:33 -06:00

114 lines
4.8 KiB
Rust

// ignore-windows: File handling is not implemented yet
// compile-flags: -Zmiri-disable-isolation
use std::fs::{File, remove_file, rename};
use std::io::{Read, Write, ErrorKind, Result, Seek, SeekFrom};
use std::path::{PathBuf, Path};
fn test_metadata(bytes: &[u8], path: &Path) -> Result<()> {
// Test that the file metadata is correct.
let metadata = path.metadata()?;
// `path` should point to a file.
assert!(metadata.is_file());
// The size of the file must be equal to the number of written bytes.
assert_eq!(bytes.len() as u64, metadata.len());
Ok(())
}
fn main() {
let tmp = std::env::temp_dir();
let filename = PathBuf::from("miri_test_fs.txt");
let path = tmp.join(&filename);
let symlink_path = tmp.join("miri_test_fs_symlink.txt");
let bytes = b"Hello, World!\n";
// Clean the paths for robustness.
remove_file(&path).ok();
remove_file(&symlink_path).ok();
// Test creating, writing and closing a file (closing is tested when `file` is dropped).
let mut file = File::create(&path).unwrap();
// Writing 0 bytes should not change the file contents.
file.write(&mut []).unwrap();
assert_eq!(file.metadata().unwrap().len(), 0);
file.write(bytes).unwrap();
assert_eq!(file.metadata().unwrap().len(), bytes.len() as u64);
// Test opening, reading and closing a file.
let mut file = File::open(&path).unwrap();
let mut contents = Vec::new();
// Reading 0 bytes should not move the file pointer.
file.read(&mut []).unwrap();
// Reading until EOF should get the whole text.
file.read_to_end(&mut contents).unwrap();
assert_eq!(bytes, contents.as_slice());
// Cloning a file should be successful.
let file = File::open(&path).unwrap();
let mut cloned = file.try_clone().unwrap();
// Reading from a cloned file should get the same text.
let mut contents = Vec::new();
cloned.read_to_end(&mut contents).unwrap();
assert_eq!(bytes, contents.as_slice());
// Test that seeking to the beginning and reading until EOF gets the text again.
file.seek(SeekFrom::Start(0)).unwrap();
let mut contents = Vec::new();
file.read_to_end(&mut contents).unwrap();
assert_eq!(bytes, contents.as_slice());
// Test seeking relative to the end of the file.
file.seek(SeekFrom::End(-1)).unwrap();
let mut contents = Vec::new();
file.read_to_end(&mut contents).unwrap();
assert_eq!(&bytes[bytes.len() - 1..], contents.as_slice());
// Test seeking relative to the current position.
file.seek(SeekFrom::Start(5)).unwrap();
file.seek(SeekFrom::Current(-3)).unwrap();
let mut contents = Vec::new();
file.read_to_end(&mut contents).unwrap();
assert_eq!(&bytes[2..], contents.as_slice());
// Test that metadata of an absolute path is correct.
test_metadata(bytes, &path).unwrap();
// Test that metadata of a relative path is correct.
std::env::set_current_dir(&tmp).unwrap();
test_metadata(bytes, &filename).unwrap();
// Creating a symbolic link should succeed.
std::os::unix::fs::symlink(&path, &symlink_path).unwrap();
// Test that the symbolic link has the same contents as the file.
let mut symlink_file = File::open(&symlink_path).unwrap();
let mut contents = Vec::new();
symlink_file.read_to_end(&mut contents).unwrap();
assert_eq!(bytes, contents.as_slice());
// Test that metadata of a symbolic link is correct.
test_metadata(bytes, &symlink_path).unwrap();
// Test that the metadata of a symbolic link is correct when not following it.
assert!(symlink_path.symlink_metadata().unwrap().file_type().is_symlink());
// Removing symbolic link should succeed.
remove_file(&symlink_path).unwrap();
// Removing file should succeed.
remove_file(&path).unwrap();
// Renaming a file should succeed.
let path1 = tmp.join("rename_source.txt");
let path2 = tmp.join("rename_destination.txt");
// Clean files for robustness.
remove_file(&path1).ok();
remove_file(&path2).ok();
let file = File::create(&path1).unwrap();
drop(file);
rename(&path1, &path2).unwrap();
assert_eq!(ErrorKind::NotFound, path1.metadata().unwrap_err().kind());
assert!(path2.metadata().unwrap().is_file());
remove_file(&path2).unwrap();
// The two following tests also check that the `__errno_location()` shim is working properly.
// Opening a non-existing file should fail with a "not found" error.
assert_eq!(ErrorKind::NotFound, File::open(&path).unwrap_err().kind());
// Removing a non-existing file should fail with a "not found" error.
assert_eq!(ErrorKind::NotFound, remove_file(&path).unwrap_err().kind());
// Reading the metadata of a non-existing file should fail with a "not found" error.
assert_eq!(ErrorKind::NotFound, test_metadata(bytes, &path).unwrap_err().kind());
}