[functional-tests (rust)] TestDir now creates dir in ./

O_DIRECT doesn't work with /tmp/

tests/common/test_dir.rs

@@ -1,27 +1,61 @@
-use anyhow::Result;
+use anyhow::{anyhow, Result};
-use std::path::{PathBuf};
+use rand::prelude::*;
-use tempfile::{tempdir, TempDir};
+use std::fs;
+use std::path::PathBuf;
 
 //---------------------------------------
 
 pub struct TestDir {
-    dir: TempDir,
+    dir: PathBuf,
+    files: Vec<PathBuf>,
+    clean_up: bool,
     file_count: usize,
 }
 
+fn mk_dir(prefix: &str) -> Result<PathBuf> {
+    for _n in 0..100 {
+        let mut p = PathBuf::new();
+        let nr = rand::thread_rng().gen_range(1000000, 9999999);
+        p.push(format!("./{}_{}", prefix, nr));
+        if let Ok(()) = fs::create_dir(&p) {
+            return Ok(p);
+        }
+    }
+
+    Err(anyhow!("Couldn't create test directory"))
+}
+
 impl TestDir {
     pub fn new() -> Result<TestDir> {
-        let dir = tempdir()?;
+        let dir = mk_dir("test_fixture")?;
-        Ok(TestDir { dir, file_count: 0 })
+        Ok(TestDir {
+            dir,
+            files: Vec::new(),
+            clean_up: true,
+            file_count: 0,
+        })
     }
 
     pub fn mk_path(&mut self, file: &str) -> PathBuf {
         let mut p = PathBuf::new();
         p.push(&self.dir);
         p.push(PathBuf::from(format!("{:02}_{}", self.file_count, file)));
+        self.files.push(p.clone());
         self.file_count += 1;
         p
     }
 }
 
+impl Drop for TestDir {
+    fn drop(&mut self) {
+        if self.clean_up {
+            while let Some(f) = self.files.pop() {
+                // It's not guaranteed that the path generated was actually created.
+                let _ignore = fs::remove_file(f);
+            }
+            fs::remove_dir(&self.dir).expect("couldn't remove test directory");
+        }
+    }
+}
+
 //---------------------------------------