Claude Code transcript

This confirms both issues clearly:

1. Issue #57 confirmed: There are 5 leftover VMs from previous test runs that were never cleaned up. The most recent one (e2etest-e9fe3877) is from the test we just ran.

2. Issue #55 likely confirmed: DNS test fails. Let me check the DNS records to verify the 0.0.0.0 issue.

OK, so the manual destroy works fine. The question is why the teardown in tests doesn't work. The destroy command succeeded (no error output), and it did destroy the VM. So maybe the teardown IS running but only for the most recent test - the older 4 VMs are from previous CI runs where perhaps the teardown failed or wasn't reached.

Let me check if maybe the issue is that during CI, the test itself fails, causing a different code path during teardown. Actually, looking at the fixture more carefully - the fixture uses yield, so teardown should still run even on test failure. The destroy did work for our run. So the 4 remaining VMs are from previous CI runs.

Let me clean those up and then focus on the root cause analysis. Let me also check what the actual destroy output looks like with debug to understand if the DNS deletion part of destroy works.

Excellent! This reveals both root causes:

1. IP is 0.0.0.0 for a long time (30+ seconds) while the instance is pending. The code treats "0.0.0.0" as a valid IP and skips the wait loop.

2. You can't destroy a pending instance on Vultr - it returns HTTP 500: "This subscription is not currently active, you cannot destroy it." This is why the teardown silently fails and VMs accumulate!

Let me wait for this instance to become active and clean it up, then fix both issues.

Now I have a complete diagnosis. Here's the summary of all issues:

Diagnosis

Root Cause 1: "0.0.0.0" treated as valid IP (Issues #55, #53, #61)

In machine/subcommands/create.py:87:

ip_address = vm.ip_address  # Returns "0.0.0.0" on Vultr
if (wait_for_ip or update_dns) and not ip_address:  # "0.0.0.0" is truthy → skips wait!

Vultr newly-created instances return main_ip: "0.0.0.0" while status: "pending". Since "0.0.0.0" is a non-empty string, not ip_address is False, so the wait-for-IP loop is never entered. The DNS record then gets created with 0.0.0.0.

The list-domain command then can't match DNS records (data 0.0.0.0) to VMs (which eventually get real IPs), so the DNS test fails.

Root Cause 2: Can't destroy pending Vultr instances (Issue #57)

Vultr returns HTTP 500 when you try to destroy an instance that is still in pending status: "This subscription is not currently active, you cannot destroy it."

Because the create command returns almost instantly (the 0.0.0.0 IP skips the wait), the tests complete in ~9 seconds. The teardown fixture then tries to destroy the VM while it's still pending, which fails. The destroy_vm call in vultr.py catches the VultrException via fatal_error() which exits the subprocess, but the test teardown ignores the subprocess return code.

Fixes needed:

1. create.py: Treat "0.0.0.0" as "no IP yet" in the wait loop
2. vultr.py: In destroy_vm, wait for the instance to become active before attempting deletion (or retry)
3. test_e2e.py: test_instance_has_ip should validate the IP is not 0.0.0.0

Want me to implement these fixes?

Here's a summary of the three bugs found and fixed:

Bug 1: "0.0.0.0" treated as valid IP (create.py) — Issues #55, #53, #61

Vultr returns main_ip: "0.0.0.0" for newly-created instances while they're still pending. The code not ip_address evaluates "0.0.0.0" as truthy, so the wait-for-IP loop was skipped entirely. The DNS record was then created with 0.0.0.0, and the list-domain command couldn't match it to the VM (which eventually gets a real IP), causing the DNS test to fail.

Fix: Treat "0.0.0.0" the same as None when checking the IP address.

Bug 2: Can't destroy pending/locked Vultr instances (vultr.py) — Issue #57

Vultr returns HTTP 500 with two different messages when you try to delete an instance that isn't ready: - "This subscription is not currently active" (status: pending) - "Server is currently locked" (status: active but still provisioning)

The old code called fatal_error on any exception, so the teardown subprocess would exit non-zero and the VM was never cleaned up. Before the IP fix, the create command returned in ~2 seconds (skipping the wait), so the VM was almost always still locked during teardown.

Fix: Retry deletion up to 24 times (2 min) with 5s backoff for known transient 500 errors.

Bug 3: IP validation too weak in test (test_e2e.py)

test_instance_has_ip only checked ip is not None — "0.0.0.0" passed this check.

Fix: Also assert ip != "0.0.0.0". Plus added teardown diagnostics so future destroy failures are visible.

Thanks! To recap the key findings:

• Vultr returns 0.0.0.0 as the initial IP for pending instances, unlike DigitalOcean which returns empty/null — this one issue cascaded into all four Vultr issues
• Vultr rejects deletion of pending/locked instances with HTTP 500 — a behavior the DigitalOcean path never encounters because DO allows deleting instances in any state

Both are Vultr-specific API behaviors that the original code didn't account for. The fixes are minimal and targeted — just the IP sentinel check in create.py and retry logic in vultr.py's destroy_vm.