jemalloc-sys: remove fs-extra (#47)

Signed-off-by: Jay Lee <BusyJayLee@gmail.com>

jemalloc-sys/Cargo.toml

@@ -30,7 +30,6 @@ libc = { version = "^0.2.8", default-features = false }
 
 [build-dependencies]
 cc = "^1.0.13"
-fs_extra = "^1.1"
 
 [features]
 default = ["background_threads_runtime_support"]

jemalloc-sys/build.rs

@@ -8,11 +8,13 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::env;
-use std::ffi::OsString;
-use std::fs;
-use std::path::{Path, PathBuf};
-use std::process::Command;
+use std::{
+    env,
+    ffi::OsString,
+    fs, io,
+    path::{Path, PathBuf},
+    process::Command,
+};
 
 include!("src/env.rs");
 
@@ -36,6 +38,23 @@ fn read_and_watch_env_os(name: &str) -> Option<OsString> {
     env::var_os(name)
 }
 
+fn copy_recursively(src: &Path, dst: &Path) -> io::Result<()> {
+    if !dst.exists() {
+        fs::create_dir_all(dst)?;
+    }
+    for entry in fs::read_dir(src)? {
+        let entry = entry?;
+        let ft = entry.file_type()?;
+        if ft.is_dir() {
+            // There should be very few layer in the project, use recusion to keep simple.
+            copy_recursively(&entry.path(), &dst.join(entry.file_name()))?;
+        } else {
+            fs::copy(entry.path(), dst.join(entry.file_name()))?;
+        }
+    }
+    Ok(())
+}
+
 // TODO: split main functions and remove following allow.
 #[allow(clippy::cognitive_complexity)]
 fn main() {
@@ -123,10 +142,7 @@ fn main() {
         fs::remove_dir_all(build_dir.clone()).unwrap();
     }
     // Copy jemalloc submodule to the OUT_DIR
-    let mut copy_options = fs_extra::dir::CopyOptions::new();
-    copy_options.overwrite = true;
-    copy_options.copy_inside = true;
-    fs_extra::dir::copy(&jemalloc_repo_dir, &build_dir, &copy_options)
+    copy_recursively(&jemalloc_repo_dir, &build_dir)
         .expect("failed to copy jemalloc source code to OUT_DIR");
     assert!(build_dir.exists());