Claude Code transcript

All clean. Here's what I implemented for issue #79:

New file: machine/subcommands/check.py - The check subcommand that validates config against the provider API.

Checks performed:

1. API authentication - Makes a read-only list_ssh_keys() call to verify the token is valid. If this fails, remaining checks are skipped since they'd all fail too.
2. SSH key - Verifies the configured SSH key exists at the provider.
3. DNS zone - Verifies the configured DNS zone exists in the provider's domain list (skipped if not configured).
4. Project - Verifies the configured project exists at the provider (skipped if not configured or not supported by the provider).
5. Region - Validates the configured region using the provider's validation.
6. Image - Validates the configured image using the provider's validation.

Output format:

Checking config for provider: DigitalOcean
  PASS: API authentication
  PASS: SSH key (my-key)
  PASS: DNS zone (example.com)
  FAIL: Project (missing-project)
  PASS: Region (NYC1)
  PASS: Image (ubuntu-24-04-x64)

Some checks failed.

Exits with code 1 if any check fails, 0 if all pass. Would you like me to commit this?

Lint passes. Here's what I added — a TestCheck class in tests/test_e2e.py with 7 tests:

Happy path (using the valid E2E config): - test_check_passes_with_valid_config — exit code 0, "All checks passed" - test_check_reports_api_auth_pass — PASS for API authentication - test_check_reports_ssh_key_pass — PASS for SSH key - test_check_reports_dns_zone_pass — PASS for DNS zone

Failure cases (using modified configs): - test_check_fails_with_bad_token — FAIL for API auth with an invalid token - test_check_fails_with_bad_ssh_key — FAIL for a nonexistent SSH key name - test_check_fails_with_bad_dns_zone — FAIL for a nonexistent DNS zone

Each failure test writes a temporary config with one bad value and verifies the check command exits non-zero with the appropriate FAIL message.

Clear. The Vultr provider's list_ssh_keys() calls fatal_error() on exception, which prints to stderr and does sys.exit(1) — so the check command's except Exception never catches it. The output shows:

Error listing SSH keys: Error 401: Invalid API token.

Instead of our FAIL: API authentication message. The fatal_error in the Vultr provider exits the process before our check code can handle it.

The fix is to catch SystemExit alongside Exception in the check command's API auth test.

The issue is that Vultr's list_ssh_keys() catches the VultrException internally and calls fatal_error(), which does sys.exit(1). SystemExit doesn't inherit from Exception in Python, so our except Exception never caught it.

Fixed by catching (Exception, SystemExit) in the API authentication check. The same pattern is already used for the region/image validation checks further down.