Fix constraints generation when there are no differences

.github/actions/build-ci-images/action.yml

@@ -45,3 +45,4 @@ runs:
         name: source-constraints
         path: ./files/constraints-*/constraints-*.txt
         retention-days: 7
+        if-no-files-found: error

.github/workflows/ci.yml

@@ -536,6 +536,7 @@ jobs:
           name: constraints
           path: ./files/constraints-*/constraints-*.txt
           retention-days: 7
+          if-no-files-found: error
 
 
   static-checks:

dev/breeze/src/airflow_breeze/commands/release_management_commands.py

@@ -613,6 +613,7 @@ def run_generate_constraints(
         command="/opt/airflow/scripts/in_container/run_generate_constraints.py",
         output=output,
     )
+
     return (
         result.returncode,
         f"Constraints {shell_params.airflow_constraints_mode}:{shell_params.python}",
@@ -624,6 +625,15 @@ def run_generate_constraints(
 )
 
 
+def list_generated_constraints(output: Output | None):
+    get_console(output=output).print("\n[info]List of generated files in './files' folder:[/]\n")
+    found_files = Path("./files").rglob("*")
+    for file in sorted(found_files):
+        if file.is_file():
+            get_console(output=output).print(file.as_posix())
+    get_console(output=output).print()
+
+
 def run_generate_constraints_in_parallel(
     shell_params_list: list[ShellParams],
     python_version_list: list[str],
@@ -764,6 +774,7 @@ def generate_constraints(
         if return_code != 0:
             get_console().print(f"[error]There was an error when generating constraints: {info}[/]")
             sys.exit(return_code)
+    list_generated_constraints(output=None)
 
 
 SDIST_FILENAME_PREFIX = "apache-airflow-providers-"

scripts/in_container/in_container_utils.py

@@ -18,6 +18,7 @@
 
 import shlex
 import subprocess
+import textwrap
 from contextlib import contextmanager
 
 import rich_click as click
@@ -30,7 +31,7 @@
 @contextmanager
 def ci_group(group_name: str, github_actions: bool):
     if github_actions:
-        console.print(f"::group::{group_name[:200]}[/]", markup=False)
+        console.print(f"::group::{textwrap.shorten(group_name, width=200)}", markup=False)
     console.print(group_name, markup=False)
     try:
         yield

scripts/in_container/run_generate_constraints.py

@@ -154,16 +154,19 @@ def freeze_packages_to_file(config_params: ConfigParams, file: TextIO) -> None:
         check=True,
         capture_output=True,
     )
+    count_lines = 0
     for line in sorted(result.stdout.split("\n")):
         if line.startswith(("apache_airflow", "apache-airflow==", "/opt/airflow", "#", "-e")):
             continue
         if "@" in line:
             continue
         if line.strip() == "":
             continue
+        count_lines += 1
         file.write(line)
         file.write("\n")
-    console.print(f"[green]Constraints generated to file: {file.name}")
+    file.flush()
+    console.print(f"[green]Constraints generated to file: {file.name}. Wrote {count_lines} lines")
 
 
 def download_latest_constraint_file(config_params: ConfigParams):
@@ -201,8 +204,8 @@ def diff_constraints(config_params: ConfigParams) -> None:
     )
     if result.returncode == 0:
         console.print("[green]No changes in constraints files. exiting")
-        config_params.current_constraints_file.unlink(missing_ok=True)
-        sys.exit(0)
+        config_params.constraints_diff_file.unlink(missing_ok=True)
+        return
     result = run_command(
         [
             "diff",
@@ -444,6 +447,11 @@ def generate_constraints(
     else:
         console.print(f"[red]Unknown constraints mode: {airflow_constraints_mode}")
         sys.exit(1)
+    console.print("[green]Generated constraints:")
+    files = config_params.constraints_dir.rglob("*.txt")
+    for file in files:
+        console.print(file.as_posix())
+    console.print()
 
 
 if __name__ == "__main__":