Expose the libzfs error type (#75)

Expose the libzfs error, so we can use it in other crates.

Signed-off-by: Joe Grund <[email protected]>

libzfs/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "libzfs"
-version = "0.6.10"
+version = "0.6.11"
 authors = ["IML Team <[email protected]>"]
 description = "Rust wrapper around libzfs-sys"
 license = "MIT"

libzfs/src/lib.rs

@@ -16,9 +16,11 @@ extern crate lazy_static;
 
 extern crate libzfs_sys as sys;
 
-mod libzfs_error;
 mod nvpair;
 
+pub mod libzfs_error;
+pub use libzfs_error::*;
+
 pub mod vdev;
 pub use vdev::VDev;
 

libzfs/src/libzfs.rs

@@ -4,16 +4,16 @@
 
 extern crate libzfs_sys as sys;
 
-use std::io::Error;
+use libzfs_error::{LibZfsError, Result};
 use nvpair;
 use nvpair::ForeignType;
-use zpool::Zpool;
-use zfs::Zfs;
-use std::ptr;
-use libzfs_error::{LibZfsError, Result};
 use std::ffi::CString;
+use std::io::Error;
 use std::os::raw::{c_int, c_void};
+use std::ptr;
 use std::sync::Mutex;
+use zfs::Zfs;
+use zpool::Zpool;
 
 lazy_static! {
     pub static ref LOCK: Mutex<()> = Mutex::new(());
@@ -23,6 +23,12 @@ pub struct Libzfs {
     raw: *mut sys::libzfs_handle_t,
 }
 
+impl Default for Libzfs {
+    fn default() -> Self {
+        Libzfs::new()
+    }
+}
+
 impl Libzfs {
     pub fn new() -> Libzfs {
         Libzfs {
@@ -85,8 +91,7 @@ impl Libzfs {
                     0 => Ok(()),
                     x => Err(LibZfsError::Io(Error::from_raw_os_error(x))),
                 }
-            })
-            .collect()
+            }).collect()
     }
     pub fn export_all(&mut self, pools: &[Zpool]) -> Result<Vec<()>> {
         pools

libzfs/src/vdev.rs

@@ -100,12 +100,10 @@ pub fn enumerate_vdev_tree(tree: &nvpair::NvList) -> Result<VDev> {
 
         let state = unsafe {
             let s = sys::zpool_state_to_name(
-                sys::to_vdev_state(vdev_stats.vs_state as u32).ok_or(Error::new(
-                    ErrorKind::NotFound,
-                    "vs_state not in enum range",
-                ))?,
+                sys::to_vdev_state(vdev_stats.vs_state as u32)
+                    .ok_or_else(|| Error::new(ErrorKind::NotFound, "vs_state not in enum range"))?,
                 sys::to_vdev_aux(vdev_stats.vs_aux as u32)
-                    .ok_or(Error::new(ErrorKind::NotFound, "vs_aux not in enum range"))?,
+                    .ok_or_else(|| Error::new(ErrorKind::NotFound, "vs_aux not in enum range"))?,
             );
 
             CStr::from_ptr(s)