From f0a5c0995b8cb05ed3efd6388b272e29446ddb65 Mon Sep 17 00:00:00 2001
From: "Robert T. McGibbon" <rmcgibbo@gmail.com>
Date: Sun, 24 Jan 2021 18:42:44 -0500
Subject: [PATCH] Make error messages more clear from nix-eval

---
 tools/nixpkgs-hammer | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/tools/nixpkgs-hammer b/tools/nixpkgs-hammer
index 4d71906..a9a0d9c 100755
--- a/tools/nixpkgs-hammer
+++ b/tools/nixpkgs-hammer
@@ -224,4 +224,9 @@ if __name__ == '__main__':
 
     args = parser.parse_args()
 
-    main(args)
+    try:
+        main(args)
+    except subprocess.CalledProcessError as e:
+        print(red(subprocess.list2cmdline(e.cmd)))
+        print(f"Returned nonzero exit status {e.returncode}")
+        sys.exit(1)