unix: Provide remove_file_or_dir_all

The implementation is relatively straightforward.  It's a shame that
we need to reach for libc to get the error handling right!

Signed-off-by: Ian Jackson <[email protected]>

Author: ijackson

Cargo.toml

@@ -19,5 +19,8 @@ categories = ["filesystem"]
 [target.'cfg(windows)'.dependencies]
 winapi = { version = "0.3", features = ["std", "errhandlingapi", "winerror", "fileapi", "winbase"]}
 
+[target.'cfg(not(windows))'.dependencies]
+libc = "0.2"
+
 [dev-dependencies]
 doc-comment = "0.3"

src/lib.rs

@@ -28,5 +28,11 @@ pub use self::fs::remove_dir_all;
 #[cfg(windows)]
 use self::fs::remove_file_or_dir_all;
 
+#[cfg(not(windows))]
+mod unix;
+
+#[cfg(not(windows))]
+use self::unix::remove_file_or_dir_all;
+
 #[cfg(not(windows))]
 pub use std::fs::remove_dir_all;

src/unix.rs

@@ -0,0 +1,12 @@
+use std::fs;
+use std::io;
+use std::path::Path;
+
+extern crate libc;
+
+pub(crate) fn remove_file_or_dir_all<P: AsRef<Path>>(path: P) -> io::Result<()> {
+    match fs::remove_file(&path) {
+        Err(e) if e.raw_os_error() == Some(libc::EISDIR) => fs::remove_dir_all(&path),
+        r => r,
+    }
+}