Add random number to multishell symlinks (#1536)

* Add random number to multishell symlinks

This protects against collisions when multiple shells are started in parallel
inside Bubblewrap sandboxes, as each shell will have the same timestamp and the
same low PID (e.g. 2), since Bubblewrap sandboxes have isolated PID spaces.

* Add a changeset

---------

Co-authored-by: Gal Schlezinger <gal@spitfire.co.il>

Author: joliss

.changeset/warm-apes-fold.md

@@ -0,0 +1,5 @@
+---
+"fnm": patch
+---
+
+Add random number to multishell symlinks to avoid clashing

Cargo.lock

@@ -20,6 +20,7 @@ etcetera = "0.8.0"
 colored = "2.1.0"
 zip = "2.1.0"
 tempfile = "3.10.1"
+fastrand = "2.1.1"
 indoc = "2.0.5"
 log = "0.4.21"
 env_logger = "0.11.3"

Cargo.toml

@@ -30,9 +30,10 @@ pub struct Env {
 
 fn generate_symlink_path() -> String {
     format!(
-        "{}_{}",
+        "{}_{}_{:010}",
         std::process::id(),
         chrono::Utc::now().timestamp_millis(),
+        fastrand::u64(..10_000_000_000),
     )
 }