106 lines
2.9 KiB
Rust
106 lines
2.9 KiB
Rust
use std::io;
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use std::path::Path;
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#[cfg(windows)]
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use crate::fs::_remove_dir_contents;
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#[cfg(not(windows))]
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use crate::unix::_remove_dir_contents;
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/// Deletes the contents of `path`, but not the directory iteself.
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///
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/// If `path` is a symlink to a directory, deletes the contents
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/// of that directory. Fails if `path` does not exist.
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pub fn remove_dir_contents<P: AsRef<Path>>(path: P) -> io::Result<()> {
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// This wrapper function exists because the core function
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// for Windows, in crate::fs, returns a PathBuf, which our
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// caller shouldn't see.
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_remove_dir_contents(path)?;
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Ok(())
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}
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/// Makes `path` an empty directory: if it does not exist, it is
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/// created it as an empty directory (as if with
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/// `std::fs::create_dir`); if it does exist, its contents are
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/// deleted (as if with `remove_dir_contents`).
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///
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/// It is an error if `path` exists but is not a directory (or
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/// a symlink to one).
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pub fn ensure_empty_dir<P: AsRef<Path>>(path: P) -> io::Result<()> {
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match std::fs::create_dir(&path) {
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Err(e) if e.kind() == io::ErrorKind::AlreadyExists
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=> remove_dir_contents(path),
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otherwise => otherwise,
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}
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}
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#[cfg(test)]
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mod test {
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use tempfile::TempDir;
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use crate::remove_dir_all;
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use crate::remove_dir_contents;
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use crate::ensure_empty_dir;
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use std::fs::{self, File};
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use std::path::PathBuf;
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use std::io;
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fn expect_failure<T>(k: io::ErrorKind, r: io::Result<T>) -> io::Result<()> {
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match r {
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Err(e) if e.kind() == k => Ok(()),
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Err(e) => Err(e),
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Ok(_) => Err(io::Error::new(
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io::ErrorKind::Other,
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"unexpected success".to_string(),
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)),
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}
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}
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struct Prep {
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_tmp: TempDir,
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ours: PathBuf,
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file: PathBuf,
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}
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fn prep() -> Result<Prep, io::Error> {
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let tmp = TempDir::new()?;
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let ours = tmp.path().join("t.mkdir");
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let file = ours.join("file");
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fs::create_dir(&ours)?;
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File::create(&file)?;
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File::open(&file)?;
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Ok(Prep { _tmp: tmp, ours, file })
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}
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#[test]
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fn mkdir_rm() -> Result<(), io::Error> {
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let p = prep()?;
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expect_failure(io::ErrorKind::Other, remove_dir_contents(&p.file))?;
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remove_dir_contents(&p.ours)?;
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expect_failure(io::ErrorKind::NotFound, File::open(&p.file))?;
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remove_dir_contents(&p.ours)?;
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remove_dir_all(&p.ours)?;
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expect_failure(io::ErrorKind::NotFound, remove_dir_contents(&p.ours))?;
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Ok(())
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}
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#[test]
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fn ensure_rm() -> Result<(), io::Error> {
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let p = prep()?;
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expect_failure(io::ErrorKind::Other, ensure_empty_dir(&p.file))?;
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ensure_empty_dir(&p.ours)?;
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expect_failure(io::ErrorKind::NotFound, File::open(&p.file))?;
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ensure_empty_dir(&p.ours)?;
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remove_dir_all(&p.ours)?;
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ensure_empty_dir(&p.ours)?;
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File::create(&p.file)?;
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Ok(())
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}
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}
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