Introduce directory traversal

native/src/base/cxx_extern.rs

@@ -0,0 +1,39 @@
+// Functions listed here are just to export to C++
+
+use crate::{fd_path, mkdirs, realpath, rm_rf, slice_from_ptr_mut, Directory, ResultExt};
+use anyhow::Context;
+use cxx::private::c_char;
+use libc::mode_t;
+use std::ffi::CStr;
+use std::io;
+use std::os::fd::{OwnedFd, RawFd};
+
+pub fn fd_path_for_cxx(fd: RawFd, buf: &mut [u8]) -> isize {
+    fd_path(fd, buf)
+        .context("fd_path failed")
+        .log()
+        .map_or(-1_isize, |v| v as isize)
+}
+
+#[no_mangle]
+unsafe extern "C" fn canonical_path(path: *const c_char, buf: *mut u8, bufsz: usize) -> isize {
+    realpath(CStr::from_ptr(path), slice_from_ptr_mut(buf, bufsz)).map_or(-1, |v| v as isize)
+}
+
+#[export_name = "mkdirs"]
+unsafe extern "C" fn mkdirs_for_cxx(path: *const c_char, mode: mode_t) -> i32 {
+    mkdirs(CStr::from_ptr(path), mode).map_or(-1, |_| 0)
+}
+
+#[export_name = "rm_rf"]
+unsafe extern "C" fn rm_rf_for_cxx(path: *const c_char) -> bool {
+    rm_rf(CStr::from_ptr(path)).map_or(false, |_| true)
+}
+
+#[no_mangle]
+unsafe extern "C" fn frm_rf(fd: OwnedFd) -> bool {
+    fn inner(fd: OwnedFd) -> io::Result<()> {
+        Directory::try_from(fd)?.remove_all()
+    }
+    inner(fd).map_or(false, |_| true)
+}