Feature/wifi sync (#446)

* Synchronizes Wifi config during the 'embassy-init' startup sequence

* Apply suggestions from code review

make directories polymorphic over AsRef

Co-authored-by: Aiden McClelland <3732071+dr-bonez@users.noreply.github.com>

* make resilient to existing symlink

* make this more idiomatic

Co-authored-by: Aiden McClelland <3732071+dr-bonez@users.noreply.github.com>
Co-authored-by: Aiden McClelland <me@drbonez.dev>

appmgr/src/bin/embassy-init.rs

@@ -110,6 +110,7 @@ async fn init(cfg_path: Option<&str>) -> Result<(), Error> {
         .await?;
     }
     log::info!("Enabled nginx public dir");
+    embassy::net::wifi::synchronize_wpa_supplicant_conf(&cfg.datadir().join("main")).await?;
 
     Ok(())
 }

appmgr/src/net/wifi.rs

@@ -1,4 +1,5 @@
 use std::collections::HashMap;
+use std::path::Path;
 use std::time::Duration;
 
 use clap::ArgMatches;
@@ -517,6 +518,21 @@ pub fn country_code_parse(code: &str, _matches: &ArgMatches<'_>) -> Result<Count
     )))
 }
 
+pub async fn synchronize_wpa_supplicant_conf<P: AsRef<Path>>(main_datadir: P) -> Result<(), Error> {
+    let target = main_datadir.as_ref().join("wpa_supplicant.conf");
+    if tokio::fs::metadata(&target).await.is_err() {
+        tokio::fs::write(&target, include_str!("wpa_supplicant.conf.base")).await?;
+    }
+    let link = Path::new("/etc/wpa_supplicant.conf");
+    if let Ok(meta) = tokio::fs::symlink_metadata(&link).await {
+        if meta.file_type().is_symlink() {
+            tokio::fs::remove_file(&link).await?
+        }
+    }
+    tokio::fs::symlink(&target, link).await?;
+    Ok(())
+}
+
 #[tokio::test]
 pub async fn test_interface_connected() {
     println!("{}", interface_connected("wlp5s0").await.unwrap());

appmgr/src/net/wpa_supplicant.conf.base

@@ -0,0 +1,3 @@
+ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
+update_config=1
+country=US