Reserialize filesystem.toml instead of copying the original config

This will be necessary to handle including other configs from the config
to use as these configs will not be copied.

src/bin/installer.rs

@@ -55,7 +55,7 @@ fn main() {
     // Add filesystem.toml to config
     config.files.push(redox_installer::FileConfig {
         path: "filesystem.toml".to_string(),
-        data: config_data,
+        data: toml::to_string_pretty(&config).unwrap(),
         ..Default::default()
     });
 

src/config/file.rs

@@ -29,7 +29,7 @@ fn chown<P: AsRef<Path>>(path: P, uid: uid_t, gid: gid_t, recursive: bool) -> Re
     Ok(())
 }
 
-#[derive(Clone, Debug, Default, Deserialize)]
+#[derive(Clone, Debug, Default, Deserialize, Serialize)]
 pub struct FileConfig {
     pub path: String,
     pub data: String,

src/config/general.rs

@@ -1,4 +1,4 @@
-#[derive(Clone, Debug, Default, Deserialize)]
+#[derive(Clone, Debug, Default, Deserialize, Serialize)]
 pub struct GeneralConfig {
     pub prompt: bool,
     // Allow config to specify cookbook recipe or binary package as default

src/config/mod.rs

@@ -5,7 +5,7 @@ pub mod file;
 pub mod package;
 pub mod user;
 
-#[derive(Clone, Debug, Default, Deserialize)]
+#[derive(Clone, Debug, Default, Deserialize, Serialize)]
 pub struct Config {
     pub general: general::GeneralConfig,
     #[serde(default)]

src/config/package.rs

@@ -1,4 +1,4 @@
-#[derive(Clone, Debug, Deserialize)]
+#[derive(Clone, Debug, Deserialize, Serialize)]
 #[serde(untagged)]
 pub enum PackageConfig {
     Empty,

src/config/user.rs

@@ -1,4 +1,4 @@
-#[derive(Clone, Debug, Default, Deserialize)]
+#[derive(Clone, Debug, Default, Deserialize, Serialize)]
 pub struct UserConfig {
     pub password: Option<String>,
     pub uid: Option<u32>,