Error check stack config

app/build_containers.py

@@ -1,4 +1,4 @@
-# Copyright © 2022 Cerc
+# Copyright © 2022, 2023 Cerc
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU Affero General Public License as published by
@@ -27,8 +27,7 @@ import subprocess
 import click
 import importlib.resources
 from pathlib import Path
-import yaml
-from .util import include_exclude_check
+from .util import include_exclude_check, get_parsed_stack_config
 
 # TODO: find a place for this
 #    epilog="Config provided either in .env or settings.ini or env vars: CERC_REPO_BASE_DIR (defaults to ~/cerc)"
@@ -70,12 +69,7 @@ def command(ctx, include, exclude):
 
     containers_in_scope = []
     if stack:
-        # 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.joinpath("data", "stacks", stack, "stack.yml")
-        with stack_file_path:
-            stack_config = yaml.safe_load(open(stack_file_path, "r"))
-            # TODO: syntax check the input here
+        stack_config = get_parsed_stack_config(stack)
         containers_in_scope = stack_config['containers']
     else:
         containers_in_scope = all_containers

app/build_npms.py

@@ -1,4 +1,4 @@
-# Copyright © 2022 Cerc
+# Copyright © 2022, 2023 Cerc
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU Affero General Public License as published by
@@ -23,10 +23,8 @@ import sys
 from decouple import config
 import click
 import importlib.resources
-from pathlib import Path
 from python_on_whales import docker, DockerException
-import yaml
-from .util import include_exclude_check
+from .util import include_exclude_check, get_parsed_stack_config
 
 @click.command()
 @click.option('--include', help="only build these packages")
@@ -62,11 +60,7 @@ def command(ctx, include, exclude):
 
     packages_in_scope = []
     if stack:
-        # 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.joinpath("data", "stacks", stack, "stack.yml")
-        with stack_file_path:
-            stack_config = yaml.safe_load(open(stack_file_path, "r"))
+        stack_config = get_parsed_stack_config(stack)
         # TODO: syntax check the input here
         packages_in_scope = stack_config['npms']
     else:

app/deploy_system.py

@@ -1,4 +1,4 @@
-# Copyright © 2022 Cerc
+# Copyright © 2022, 2023 Cerc
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU Affero General Public License as published by
@@ -22,8 +22,7 @@ from python_on_whales import DockerClient
 import click
 import importlib.resources
 from pathlib import Path
-import yaml
-from .util import include_exclude_check
+from .util import include_exclude_check, get_parsed_stack_config
 
 
 @click.command()
@@ -62,11 +61,7 @@ def command(ctx, include, exclude, cluster, command, services):
 
     pods_in_scope = []
     if stack:
-        # 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.joinpath("data", "stacks", stack, "stack.yml")
-        with stack_file_path:
-            stack_config = yaml.safe_load(open(stack_file_path, "r"))
+        stack_config = get_parsed_stack_config(stack)
         # TODO: syntax check the input here
         pods_in_scope = stack_config['pods']
     else:

app/util.py

@@ -1,4 +1,4 @@
-# Copyright © 2022 Cerc
+# Copyright © 2022, 2023 Cerc
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU Affero General Public License as published by
@@ -13,6 +13,12 @@
 # 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/>.
 
+import os.path
+import sys
+import yaml
+from pathlib import Path
+
+
 def include_exclude_check(s, include, exclude):
     if include is None and exclude is None:
         return True
@@ -22,3 +28,23 @@ def include_exclude_check(s, include, exclude):
     if exclude is not None:
         exclude_list = exclude.split(",")
         return s not in exclude_list
+
+
+def get_parsed_stack_config(stack):
+    # 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.joinpath("data", "stacks", stack, "stack.yml")
+    try:
+        with stack_file_path:
+            stack_config = yaml.safe_load(open(stack_file_path, "r"))
+            return stack_config
+    except FileNotFoundError as error:
+        # We try here to generate a useful diagnostic error
+        # First check if the stack directory is present
+        stack_directory = stack_file_path.parent
+        if os.path.exists(stack_directory):
+            print(f"Error: stack.yml file is missing from stack: {stack}")
+        else:
+            print(f"Error: stack: {stack} does not exist")
+        print(f"Exiting, error: {error}")
+        sys.exit(1)