Exchange From for TryFrom for PathBuf and Home

The `From` implementation would allow someone to create a `Home` in an
incorrect fashion, for example the path is not canonical.

Exchange `From` for a `TryFrom` implementation.

Signed-off-by: Fintan Halpenny <fintan.halpenny@gmail.com>
X-Clacks-Overhead: GNU Terry Pratchett

radicle-cli/examples/rad-patch.md

@@ -56,7 +56,7 @@ $ rad patch
 - YOU PROPOSED -
 
 define power requirements d4ef85f57a8 R0 3e674d1 (flux-capacitor-power) ahead 1, behind 0
-└─ * opened by z6MknSLrJoTcukLrE435hVNQT4JUhbvWLX4kUzqkEStBU8Vi (you) [..]
+└─ * opened by did:key:z6MknSLrJoTcukLrE435hVNQT4JUhbvWLX4kUzqkEStBU8Vi (you) [..]
 └─ * patch id d4ef85f57a849bd845915d7a66a2192cd23811f6
 
 - OTHERS PROPOSED -

radicle-httpd/src/api/test.rs

@@ -1,3 +1,4 @@
+use std::convert::TryInto as _;
 use std::path::Path;
 use std::str::FromStr;
 use std::sync::Arc;
@@ -81,7 +82,8 @@ pub fn seed(dir: &Path) -> Context {
     .unwrap();
 
     // eq. rad auth
-    let profile = radicle::Profile::init(rad_home.into(), PASSWORD.to_owned()).unwrap();
+    let profile =
+        radicle::Profile::init(rad_home.try_into().unwrap(), PASSWORD.to_owned()).unwrap();
 
     // rad init
     rad_init::init(

radicle/src/profile.rs

@@ -163,9 +163,11 @@ pub struct Home {
     path: PathBuf,
 }
 
-impl From<PathBuf> for Home {
-    fn from(path: PathBuf) -> Self {
-        Self { path }
+impl TryFrom<PathBuf> for Home {
+    type Error = io::Error;
+
+    fn try_from(home: PathBuf) -> Result<Self, Self::Error> {
+        Self::new(home)
     }
 }