misc: add AbstractPlatform::user_ssh_config

src/os/mod.rs

@@ -45,6 +45,15 @@ pub trait AbstractPlatform {
     /// On most platforms this will be `/etc/ssh/ssh_config`
     fn system_ssh_config() -> &'static str;
 
+    /// Path to the user ssh config file.
+    /// On most platforms this will be `${HOME}/.ssh/config`
+    /// # Note
+    /// This is a _theoretical_ path construction; it does not guarantee that the path actually exists.
+    /// That is up to the caller to determine and reason about.
+    /// # Errors
+    /// If the current user's home directory could not be determined
+    fn user_ssh_config() -> Result<PathBuf>;
+
     /// The directory to store user configuration files in.
     ///
     /// On Unix platforms this is the traditional home directory.

src/os/unix.rs

@@ -99,6 +99,15 @@ impl super::AbstractPlatform for Platform {
         "/etc/ssh/ssh_config"
     }
 
+    fn user_ssh_config() -> Result<PathBuf> {
+        let Some(mut pb) = dirs::home_dir() else {
+            anyhow::bail!("could not determine home directory");
+        };
+        pb.push(".ssh");
+        pb.push("config");
+        Ok(pb)
+    }
+
     fn user_config_dir() -> Option<PathBuf> {
         dirs::home_dir()
     }