cli: use hostname-based generation instead of bird names (#173220)

Fixes #167708 by using a more predictable naming scheme.

```
me> Write a haiku about the extinction of birds
chatgpt>
	Silent skies above,
	Once lively songs now gone,
	Fading memories.
```

cli/src/tunnels/dev_tunnels.rs

@@ -4,7 +4,8 @@
  *--------------------------------------------------------------------------------------------*/
 use crate::auth;
 use crate::constants::{
-	CONTROL_PORT, PROTOCOL_VERSION_TAG, PROTOCOL_VERSION_TAG_PREFIX, TUNNEL_SERVICE_USER_AGENT, IS_INTERACTIVE_CLI,
+	CONTROL_PORT, IS_INTERACTIVE_CLI, PROTOCOL_VERSION_TAG, PROTOCOL_VERSION_TAG_PREFIX,
+	TUNNEL_SERVICE_USER_AGENT,
 };
 use crate::state::{LauncherPaths, PersistedState};
 use crate::util::errors::{
@@ -31,8 +32,6 @@ use tunnels::management::{
 	NO_REQUEST_OPTIONS,
 };
 
-use super::name_generator;
-
 #[derive(Clone, Serialize, Deserialize)]
 pub struct PersistedTunnel {
 	pub name: String,
@@ -636,10 +635,14 @@ impl DevTunnels {
 		mut use_random_name: bool,
 	) -> Result<String, AnyError> {
 		let existing_tunnels = self.list_all_server_tunnels().await?;
+		println!("{:?}", existing_tunnels);
 		let is_name_free = |n: &str| {
-			!existing_tunnels
-				.iter()
-				.any(|v| v.tags.iter().any(|t| t == n))
+			!existing_tunnels.iter().any(|v| {
+				v.status
+					.as_ref()
+					.and_then(|s| s.host_connection_count.as_ref().map(|c| c.get_count()))
+					.unwrap_or(0) > 0 && v.tags.iter().any(|t| t == n)
+			})
 		};
 
 		if let Some(machine_name) = preferred_name {
@@ -658,11 +661,19 @@ impl DevTunnels {
 			use_random_name = true;
 		}
 
-		let mut placeholder_name = name_generator::generate_name(MAX_TUNNEL_NAME_LENGTH);
-		if use_random_name || !*IS_INTERACTIVE_CLI {
-			while !is_name_free(&placeholder_name) {
-				placeholder_name = name_generator::generate_name(MAX_TUNNEL_NAME_LENGTH);
+		let mut placeholder_name =
+			clean_hostname_for_tunnel(&gethostname::gethostname().to_string_lossy());
+		if !is_name_free(&placeholder_name) {
+			for i in 2.. {
+				let fixed_name = format!("{}{}", placeholder_name, i);
+				if is_name_free(&fixed_name) {
+					placeholder_name = fixed_name;
+					break;
+				}
 			}
+		}
+
+		if use_random_name || !*IS_INTERACTIVE_CLI {
 			return Ok(placeholder_name);
 		}
 
@@ -959,3 +970,49 @@ impl Backoff {
 		self.failures = 0;
 	}
 }
+
+/// Cleans up the hostname so it can be used as a tunnel name.
+/// See TUNNEL_NAME_PATTERN in the tunnels SDK for the rules we try to use.
+fn clean_hostname_for_tunnel(hostname: &str) -> String {
+	let mut out = String::new();
+	for char in hostname.chars().take(60) {
+		match char {
+			'-' | '_' | ' ' => {
+				out.push('-');
+			}
+			'0'..='9' | 'a'..='z' | 'A'..='Z' => {
+				out.push(char);
+			}
+			_ => {}
+		}
+	}
+
+	let trimmed = out.trim_matches('-');
+	if trimmed.len() < 2 {
+		"remote-machine".to_string() // placeholder if the result was empty
+	} else {
+		trimmed.to_owned()
+	}
+}
+
+#[cfg(test)]
+mod test {
+	use super::*;
+
+	#[test]
+	fn test_clean_hostname_for_tunnel() {
+		assert_eq!(
+			clean_hostname_for_tunnel("hello123"),
+			"hello123".to_string()
+		);
+		assert_eq!(
+			clean_hostname_for_tunnel("-cool-name-"),
+			"cool-name".to_string()
+		);
+		assert_eq!(
+			clean_hostname_for_tunnel("cool!name with_chars"),
+			"coolname-with-chars".to_string()
+		);
+		assert_eq!(clean_hostname_for_tunnel("z"), "remote-machine".to_string());
+	}
+}