fn read_mount_info_map()

in below/procfs/src/lib.rs [395:418]

• 19 lines of code
• 5 McCabe index (conditional complexity)

    fn read_mount_info_map(&self) -> Result<HashMap<String, MountInfo>> {
        // Map contains a MountInfo object corresponding to the first
        // mount of each mount source. The first mount is what shows in
        // the 'df' command and reflects the usage of the device.
        let path = self.path.join("self/mountinfo");
        let file = File::open(&path).map_err(|e| Error::IoError(path.clone(), e))?;
        let buf_reader = BufReader::new(file);
        let mut mount_info_map: HashMap<String, MountInfo> = HashMap::new();

        for line in buf_reader.lines() {
            let line = line.map_err(|e| Error::IoError(path.clone(), e))?;
            if let Ok(mount_info) = self.process_mount_info(&path, &line) {
                if let Some(mount_source) = mount_info.mount_source.clone() {
                    mount_info_map.entry(mount_source).or_insert(mount_info);
                }
            }
        }

        if mount_info_map.is_empty() {
            Err(Error::InvalidFileFormat(path))
        } else {
            Ok(mount_info_map)
        }
    }