Add several tests; Fix blocking when creating fifo node caused by opening file for reading - move the open to the block which runs only if it is a normal file;

src/node.rs

@@ -24,18 +24,18 @@ enum Kind {
 
 impl From<u32> for Kind {
     fn from(value: u32) -> Self {
-        if value & 0o60000 != 0 {
-            Self::Block
+        if value & 0o40000 != 0 {
+            Self::Dir
         } else if value & 0o20000 != 0 {
             Self::Char
+        } else if value & 0o60000 != 0 {
+            Self::Block
         } else if value & 0o10000 != 0 {
             Self::Pipe
-        } else if value & 0o40000 != 0 {
-            Self::Dir
         } else if value & 0o100000 != 0 {
             Self::Normal
         } else {
-            panic!();
+            unreachable!();
         }
     }
 }
@@ -131,13 +131,11 @@ impl Node {
         links: &Mutex<HashMap<u64, String>>,
     ) -> Result<Self, Error> {
         let name = String::from(path);
-        let fd = fs::File::open(path)?;
         let meta = fs::symlink_metadata(path)?;
         let mode = meta.mode();
         let uid = meta.uid();
         let gid = meta.gid();
         let mtime = meta.mtime().try_into()?;
-        let mut reader = BufReader::new(fd);
         let ft = meta.file_type();
         let filetype = 'blk: {
             if ft.is_dir() {
@@ -171,6 +169,8 @@ impl Node {
                     break 'blk FileType::Fifo;
                 } else if kind == Kind::Normal {
                     let mut data = vec![];
+                    let fd = fs::File::open(path)?;
+                    let mut reader = BufReader::new(fd);
                     let len = reader.read_to_end(&mut data)?.try_into()?;
                     let checksum = match algorithm {
                         Algorithm::Md5 => {
@@ -308,10 +308,37 @@ impl Node {
 #[cfg(test)]
 mod tests {
     use super::*;
-    use std::{ffi::CString, fmt::Write, fs::remove_file};
+    use std::{fmt::Write, fs::remove_file};
 
     static LI: &[u8] = include_bytes!("../test/li.txt");
 
+    #[test]
+    fn get_kind_dir() {
+        let meta = fs::symlink_metadata("test").unwrap();
+        let mode = meta.mode();
+        let kind = Kind::from(mode);
+        assert_eq!(kind, Kind::Dir);
+    }
+
+    #[test]
+    fn get_kind_fifo() {
+        let _ = remove_file("test/fifo");
+        nix::mkfifo("test/fifo", 0o644).unwrap();
+        let meta = fs::symlink_metadata("test/fifo").unwrap();
+        let mode = meta.mode();
+        let kind = Kind::from(mode);
+        assert_eq!(kind, Kind::Pipe);
+    }
+
+    #[test]
+    #[cfg(target_os = "linux")]
+    fn get_kind_char() {
+        let meta = fs::symlink_metadata("/dev/null").unwrap();
+        let mode = meta.mode();
+        let kind = Kind::from(mode);
+        assert_eq!(kind, Kind::Char);
+    }
+
     #[test]
     fn from_file_path() {
         let links = Mutex::new(HashMap::new());
@@ -359,21 +386,17 @@ mod tests {
         }
     }
 
-    // TODO: Discover why this test blocks
-    /*#[test]
+    #[test]
     fn from_fifo_path() {
         let _res = remove_file("test/fifo");
-        let fname = CString::new("test/fifo").unwrap();
-        unsafe {
-            libc::mkfifo(fname.as_ptr(), 0o644);
-        }
+        nix::mkfifo("test/fifo", 0o644).unwrap();
         let links = Mutex::new(HashMap::new());
         let node = Node::from_path("test/fifo", Algorithm::Skip, &links).unwrap();
         let FileType::Fifo = node.filetype else {
             eprintln!("Incorrect filetype: {:?}", node.filetype);
             panic!();
         };
-    }*/
+    }
 
     #[test]
     fn load_store_file() {