From 12962c2f07bee211c86326c056bbf085295fd3ff Mon Sep 17 00:00:00 2001
From: yadavchiragg <chiragyadav.global@gmail.com>
Date: Fri, 13 Nov 2026 08:35:06 +0530
Subject: [PATCH] fix(cli): exit non-zero when concore build --auto-build fails

---
 concore_cli/commands/build.py |  7 +++-
 tests/test_build_failure.py   | 68 +++++++++++++++++++++++++++++++++++
 2 files changed, 74 insertions(+), 1 deletion(-)
 create mode 100644 tests/test_build_failure.py

diff --git a/concore_cli/commands/build.py b/concore_cli/commands/build.py
index aeb2e50..d5206de 100644
--- a/concore_cli/commands/build.py
+++ b/concore_cli/commands/build.py
@@ -318,9 +318,14 @@ def build_workflow(
                     console.print("[green]✓[/green] Build completed")
                 except subprocess.CalledProcessError as e:
                     progress.stop()
-                    console.print("[yellow]Build failed[/yellow]")
+                    console.print("[red]Build failed[/red]")
+                    if e.stdout:
+                        console.print(e.stdout)
                     if e.stderr:
                         console.print(e.stderr)
+                    raise RuntimeError(
+                        f"Build script {build_script.name} failed with exit code {e.returncode}"
+                    ) from e
 
     run_command = "docker compose up" if compose else "./run"
     if exec_type == "windows":
diff --git a/tests/test_build_failure.py b/tests/test_build_failure.py
new file mode 100644
index 0000000..a3d7af7
--- /dev/null
+++ b/tests/test_build_failure.py
@@ -0,0 +1,68 @@
+"""`concore build --auto-build` must fail when the generated build script fails.
+
+It used to print "Build failed" and then "Workflow ready!" and exit 0, so
+scripts and CI treated a broken build as a success.
+"""
+
+import subprocess
+from pathlib import Path
+from unittest.mock import patch
+
+from click.testing import CliRunner
+
+from concore_cli.cli import cli
+
+REAL_RUN = subprocess.run
+
+
+def _fail_only_the_build_script(*args, **kwargs):
+    command = args[0] if args else kwargs.get("args")
+    if isinstance(command, list) and Path(command[0]).name in ("build", "build.bat"):
+        raise subprocess.CalledProcessError(
+            3, command, output="build stdout", stderr="build stderr"
+        )
+    return REAL_RUN(*args, **kwargs)
+
+
+def _build(runner, auto_build=True):
+    assert runner.invoke(cli, ["init", "proj"]).exit_code == 0
+    args = [
+        "build",
+        "proj/workflow.graphml",
+        "--output",
+        "out",
+        "--type",
+        "posix",
+    ]
+    if auto_build:
+        args.append("--auto-build")
+    return runner.invoke(cli, args)
+
+
+def test_failed_auto_build_exits_nonzero(tmp_path, monkeypatch):
+    monkeypatch.chdir(tmp_path)
+    runner = CliRunner()
+    with patch(
+        "concore_cli.commands.build.subprocess.run",
+        side_effect=_fail_only_the_build_script,
+    ):
+        result = _build(runner)
+    assert result.exit_code != 0
+    assert "Build failed" in result.output
+    assert "build stderr" in result.output
+    assert "Workflow ready" not in result.output
+
+
+def test_successful_auto_build_still_exits_zero(tmp_path, monkeypatch):
+    monkeypatch.chdir(tmp_path)
+    result = _build(CliRunner())
+    assert result.exit_code == 0, result.output
+    assert "Build completed" in result.output
+    assert "Workflow ready" in result.output
+
+
+def test_build_without_auto_build_is_unaffected(tmp_path, monkeypatch):
+    monkeypatch.chdir(tmp_path)
+    result = _build(CliRunner(), auto_build=False)
+    assert result.exit_code == 0, result.output
+    assert "Workflow ready" in result.output