Record error when setting up repo fails rather than abort entire script.

src/nix_util/running_build.rs

@@ -1,4 +1,5 @@
 use std::borrow::Cow;
+use std::process::ExitStatus;
 use std::time::Duration;
 use std::time::Instant;
 use std::time::SystemTime;
@@ -43,7 +44,7 @@ impl<'db> RunningBuild<'db> {
         &mut self,
         mut child: Child,
         target_name: TN,
-    ) -> Result<()>
+    ) -> Result<ExitStatus>
     where
         TN: AsRef<str>,
     {
@@ -66,20 +67,7 @@ impl<'db> RunningBuild<'db> {
         let exit_status = exit_status_handle.await?;
         println!("nix build status was: {}", exit_status);
 
-        let update: u64 =
-            sqlx::query(r#"UPDATE build SET end_time=unixepoch('now'), status=? WHERE id=?"#)
-                .bind(
-                    exit_status
-                        .code()
-                        .expect("Process should have an exit code."),
-                )
-                .bind(self.build_id)
-                .execute(&self.db_handle.conn)
-                .await?
-                .rows_affected();
-        assert!(update == 1);
-
-        Ok(())
+        Ok(exit_status)
     }
 
     pub(crate) fn handle_message(&mut self, message: NixMessage) -> Result<()> {