Fail gracefully on bad stack

stack_orchestrator/constants.py

@@ -13,4 +13,4 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http:#www.gnu.org/licenses/>.
 
-stack_file_name = "stack.yml"
+stack_file_name = "stack.yml"

stack_orchestrator/repos/setup_repositories.py

@@ -26,7 +26,7 @@ import importlib.resources
 from pathlib import Path
 import yaml
 from stack_orchestrator.constants import stack_file_name
-from stack_orchestrator.util import include_exclude_check
+from stack_orchestrator.util import include_exclude_check, error_exit
 
 
 class GitProgress(git.RemoteProgress):
@@ -245,6 +245,8 @@ def command(ctx, include, exclude, git_ssh, check_only, pull, branches, branches
             # In order to be compatible with Python 3.8 we need to use this hack to get the path:
             # See: https://stackoverflow.com/questions/25389095/python-get-path-of-root-project-structure
             stack_file_path = Path(__file__).absolute().parent.parent.joinpath("data", "stacks", stack, stack_file_name)
+        if not stack_file_path.exists():
+            error_exit(f"stack {stack} does not exist")
         with stack_file_path:
             stack_config = yaml.safe_load(open(stack_file_path, "r"))
             # TODO: syntax check the input here

stack_orchestrator/util.py

@@ -167,3 +167,8 @@ def global_options(ctx):
 # TODO: hack
 def global_options2(ctx):
     return ctx.parent.obj
+
+
+def error_exit(s):
+    print(f"ERROR: {s}")
+    sys.exit(1)