feature: Implement TryFrom (#7)

CHANGELOG.md

@@ -4,6 +4,7 @@
 
 ### Added
 
+* implementations for `TryFrom` to start / stop jails.
 * example showing how to query RCTL usage.
 * code coverage with codecov.io. Unfortunately, this doesn't yet take docstests
   into account, so coverage is actually a bit better in reality.

src/running.rs

@@ -6,6 +6,7 @@ use JailError;
 use StoppedJail;
 
 use std::collections::HashMap;
+use std::convert::TryFrom;
 use std::io::{Error, ErrorKind};
 use std::net;
 use std::path;
@@ -545,6 +546,14 @@ impl RunningJail {
     }
 }
 
+impl TryFrom<StoppedJail> for RunningJail {
+    type Error = JailError;
+
+    fn try_from(stopped: StoppedJail) -> Result<RunningJail, Self::Error> {
+        stopped.start()
+    }
+}
+
 /// An Iterator over running Jails
 ///
 /// See [RunningJail::all()](struct.RunningJail.html#method.all) for a usage

src/stopped.rs

@@ -11,6 +11,7 @@ use RunningJail;
 #[cfg(feature = "serialize")]
 use serde::Serialize;
 
+use std::convert::TryFrom;
 use std::fmt;
 
 /// Represent a stopped jail including all information required to start it
@@ -52,6 +53,14 @@ impl Default for StoppedJail {
     }
 }
 
+impl TryFrom<RunningJail> for StoppedJail {
+    type Error = JailError;
+
+    fn try_from(running: RunningJail) -> Result<StoppedJail, Self::Error> {
+        running.stop()
+    }
+}
+
 #[cfg(target_os = "freebsd")]
 impl StoppedJail {
     /// Create a new Jail instance given a path.