switch-to-configuration-ng: prevent error during NIXOS_LUSTRATE install

pkgs/by-name/sw/switch-to-configuration-ng/src/src/main.rs

@@ -970,10 +970,6 @@ fn do_system_switch(action: Action) -> anyhow::Result<()> {
         std::env::set_var("LOCALE_ARCHIVE", locale_archive);
     }
 
-    let current_system_bin = std::path::PathBuf::from("/run/current-system/sw/bin")
-        .canonicalize()
-        .context("/run/current-system/sw/bin is missing")?;
-
     let os_release = parse_os_release().context("Failed to parse os-release")?;
 
     let distro_id_re = Regex::new(format!("^\"?{}\"?$", distro_id).as_str())
@@ -1033,6 +1029,11 @@ fn do_system_switch(action: Action) -> anyhow::Result<()> {
         std::process::exit(0);
     }
 
+    // Needs to be after the "boot" action exits, as this directory will not exist when doing a NIXOS_LUSTRATE install
+    let current_system_bin = std::path::PathBuf::from("/run/current-system/sw/bin")
+        .canonicalize()
+        .context("/run/current-system/sw/bin is missing")?;
+
     let current_init_interface_version =
         std::fs::read_to_string("/run/current-system/init-interface-version").unwrap_or_default();