Getting address from domiffaddress and if adress is not found throws exception VMIPAddressMissingError in both ipv4 and ipv6 case

[TasmiyaNalatwad]

Few of the times it is seen that the ip address is not being fetch and the avocado runs were failed with error "ERROR: Failures occurred while postprocess:\n\n: Guest virt-tests-vm1 dmesg verification failed: Login timeout expired (output: 'exceeded 240 s timeout, last failure: No ipv4 DHCP lease for MAC aa:bb:cc:dd:ee:ff') "

To handle this error the patch has been sent. The patch helps in obtaining ip address of the guest using "virsh-net-dhcp-leases default" command. If the guest mac address is found in the command output, the mac ipv4 address is obatined and updated in the address.cache

If the ip_version is ipv6, then it raises exception VMIPAddressMissingError, and going to retry logic to try getting the ip address.

Even in case of ipv4, if the address is not found, instead of sending None, i am raising exception VMIPAddressMissingError which leads to retry menthod.

Summary by CodeRabbit

• New Features

  • Added automatic IPv4 fallback for discovering guest VM addresses when standard lookup is unavailable.
  • Discovered addresses are reused for subsequent requests.
  • Guest IPs can now be identified from interface address information using the interface MAC address.

• Bug Fixes

  • Improved guest IP retrieval when interface details are reported by the virtualization environment.
  • Missing-address errors now provide clearer details when IPv4 discovery fails.

[coderabbitai]

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Walkthrough

Adds a VM._get_address override that falls back to MAC-based IPv4 discovery after superclass lookup fails. The fallback calls utils_net.obtain_guest_ip_from_domifaddr, caches a discovered address, and returns it. The utility parses virsh domifaddr --full --source arp output and returns the matching IPv4 address.

Changes

Cohort / File(s)	Summary of Changes
Libvirt VM address resolution virttest/libvirt_vm.py	Added the VM._get_address override and imported utils_net.
Networking utilities virttest/utils_net.py	Added obtain_guest_ip_from_domifaddr to query and parse virsh domifaddr output.

Priority: ➖ Normal

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: 🔵 Low · up to 261f8

Guest address lookup can still fail for VMs using a non-default libvirt connection. Pass the configured connection URI through the fallback before merging.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: guest address lookup through libvirt and raising VMIPAddressMissingError when no IPv4 or IPv6 address is found. It is longer and contains spelling error…
Docstring Coverage	✅ Passed	Docstring coverage is 80.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 5 functions across 2 files.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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[TasmiyaNalatwad]

@smitterl @chloerh @luckyh I have tried fixing the regression due to these changes based on PR #4250

Please have a look.

Now instead of returning None, i am raising exception VMIPAddressMissingError which allows the retry code to execute in both ipv4 and ipv6 cases.

Please let me know your inputs for this fix.

Thank you.

[coderabbitai]

Actionable comments posted: 2

📜 Review details

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Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between efccd9f and d6279e5.

📒 Files selected for processing (2)

• virttest/libvirt_vm.py (2 hunks)
• virttest/utils_net.py (2 hunks)

🧰 Additional context used

🧬 Code graph analysis (2)

virttest/libvirt_vm.py (2)

virttest/virt_vm.py (4)

• _get_address (814-872)
• _get_address (930-934)
• VMIPAddressMissingError (246-253)
• get_mac_address (767-782)

virttest/utils_net.py (2)

• get_mac_address (3413-3420)
• obtain_guest_ip_from_domifaddr (4899-4914)

virttest/utils_net.py (1)

virttest/virsh.py (1)

• domifaddr (3533-3543)

🪛 Ruff (0.14.0)

virttest/libvirt_vm.py

393-395: Within an except clause, raise exceptions with raise ... from err or raise ... from None to distinguish them from errors in exception handling

(B904)

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393-395: Avoid specifying long messages outside the exception class

(TRY003)

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397-399: Within an except clause, raise exceptions with raise ... from err or raise ... from None to distinguish them from errors in exception handling

(B904)

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397-399: Avoid specifying long messages outside the exception class

(TRY003)

⏰ Context from checks skipped due to timeout of 90000ms. You can increase the timeout in your CodeRabbit configuration to a maximum of 15 minutes (900000ms). (1)

• GitHub Check: avocado_devel AVOCADO_SRC:git+https://github.com/avocado-framework/avocado@92lts#egg=avocado_framework SETUP:-m pip install . VT_TYPE:qemu

[TasmiyaNalatwad]

@smitterl Would you please run your test with these changes and check if the regression issue still occurs? This will help confirm whether the fix resolves the problem effectively. Thank You in Advance.

[TasmiyaNalatwad]

@smitterl @chloerh would you please look at this PR and confirm if regression is solved with this fix.

[harihare]

May I request @smitterl or @chloerh help in reviewing the patch.

[TasmiyaNalatwad]

@smitterl @chloerh Would you please have a look at this PR. If regression is solved with these changes can we move forward and merge this PR.

Thank you so much for your time and support.

[TasmiyaNalatwad]

@smitterl @chloerh would you please confirm and let me know with this fix the regression is addressed or not. We need this patch for our test buckets to run.

Thanks in Advance.

[TasmiyaNalatwad]

@smitterl @chloerh would you please confirm and let me know with this fixes the regression. We need this patch for our test buckets to run.

Thanks in Advance.

[pevogam]

Same as in #4046 (comment).

[TasmiyaNalatwad]

Same as in #4046 (comment).

Thanks for your time @pevogam . I have addressed now the left one comments and marked them as resolved. Requesting to please have a look.
Thank you

[coderabbitai]

Actionable comments posted: 1

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• 🪄 Fix CodeRabbit comments on this PR

🤖 Prompt to fix review comments

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Inline comments:
In `@virttest/utils_net.py`:
- Line 4906: Update obtain_guest_ip_from_domifaddr to accept a uri argument and
pass it to virsh.domifaddr; update VM._get_address to provide self.connect_uri
when invoking this fallback, preserving the existing behavior for other
arguments.

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📥 Commits

Reviewing files that changed from the base of the PR and between ffb9c29 and 261f8aa.

📒 Files selected for processing (2)

• virttest/libvirt_vm.py
• virttest/utils_net.py

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[TasmiyaNalatwad]

Addressed all the review comments.