Add external stack support (#806)

Reviewed-on: cerc-io/stack-orchestrator#806
Co-authored-by: David Boreham <david@bozemanpass.com>
Co-committed-by: David Boreham <david@bozemanpass.com>

stack_orchestrator/repos/fetch_stack.py

@@ -0,0 +1,45 @@
+# Copyright © 2022, 2023 Vulcanize
+
+# 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
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+
+# 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/>.
+
+# env vars:
+# CERC_REPO_BASE_DIR defaults to ~/cerc
+
+
+import click
+import os
+
+from decouple import config
+from git import exc
+
+from stack_orchestrator.opts import opts
+from stack_orchestrator.repos.setup_repositories import process_repo
+from stack_orchestrator.util import error_exit
+
+
+@click.command()
+@click.argument('stack-locator')
+@click.option('--git-ssh', is_flag=True, default=False)
+@click.option('--check-only', is_flag=True, default=False)
+@click.option('--pull', is_flag=True, default=False)
+@click.pass_context
+def command(ctx, stack_locator, git_ssh, check_only, pull):
+    '''optionally resolve then git clone a repository containing one or more stack definitions'''
+    dev_root_path = os.path.expanduser(config("CERC_REPO_BASE_DIR", default="~/cerc"))
+    if not opts.o.quiet:
+        print(f"Dev Root is: {dev_root_path}")
+    try:
+        process_repo(pull, check_only, git_ssh, dev_root_path, None, stack_locator)
+    except exc.GitCommandError as error:
+        error_exit(f"\n******* git command returned error exit status:\n{error}")