virsh_cmd: Change boot time fetching function

[aniket-sahu-ibmx]

The --since arg for uptime is not part of the basic package shipped with SLES releases. This caused the test to fail silently. This change uses /proc/stat to get boot time which will be present in every linux distro, thus making the test distro-independent

Summary by CodeRabbit

• Tests
  • Improved boot time detection method in reboot tests for enhanced reliability.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

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Run ID: e4b27b47-e3ad-48a2-9501-30d67d2f6eb1

📥 Commits

Reviewing files that changed from the base of the PR and between c96ab65 and e0be62b.

📒 Files selected for processing (1)

• libvirt/tests/src/virsh_cmd/domain/virsh_reboot.py

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Walkthrough

In virsh_reboot.py, the nested get_boot_time() helper replaces the uptime --since command with a /proc/stat-based pipeline (grep btime /proc/stat | awk ...) to retrieve the guest boot timestamp. The parsed value is assigned to boot_time. All other reboot flow logic, polling, exception handling, and result verification remain unchanged.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

🚥 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: modifying the boot time fetching function from using uptime --since to parsing /proc/stat.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.
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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[aniket-sahu-ibmx]

Before:

08:22:57 INFO : Running: /usr/local/bin/avocado run --vt-type libvirt --vt-config /home/stuff/tests/data/avocado-vt/backends/libvirt/cfg/backuprestore.cfg --force-job-id 4b0f7b7a93c2a59a2d5c34c56c9d17bbef45595a --job-results-dir /home/stuff/tests/results --vt-only-filter "virtio_scsi virtio_net qcow2 SLES.16.1.ppc64le"
/usr/local/lib/python3.13/site-packages/avocado/core/init.py:18: UserWarning: pkg_resources is deprecated as an API. See https://setuptools.pypa.io/en/latest/pkg_resources.html. The pkg_resources package is slated for removal as early as 2025-11-30. Refrain from using this package or pin to Setuptools<81.
import pkg_resources
No python imaging library installed. Screendump and Windows guest BSOD detection are disabled. In order to enable it, please install python-imaging or the equivalent for your distro.
No python imaging library installed. PPM image conversion to JPEG disabled. In order to enable it, please install python-imaging or the equivalent for your distro.
No python imaging library installed. Screendump and Windows guest BSOD detection are disabled. In order to enable it, please install python-imaging or the equivalent for your distro.
No python imaging library installed. PPM image conversion to JPEG disabled. In order to enable it, please install python-imaging or the equivalent for your distro.
JOB ID : 4b0f7b7a93c2a59a2d5c34c56c9d17bbef45595a
JOB LOG : /home/stuff/tests/results/job-2026-06-22T08.22-4b0f7b7/job.log
(1/1) type_specific.io-github-autotest-libvirt.virsh.reboot.normal_test.id_option.no_mode: STARTED
(1/1) type_specific.io-github-autotest-libvirt.virsh.reboot.normal_test.id_option.no_mode: FAIL: Cmd error: Error status: running (booted)\n\n (95.38 s)

RESULTS : PASS 0 | ERROR 0 | FAIL 1 | SKIP 0 | WARN 0 | INTERRUPT 0 | CANCEL 0
JOB HTML : /home/stuff/tests/results/job-2026-06-22T08.22-4b0f7b7/results.html
JOB TIME : 236.22 s

After:
09:32:56 INFO : Running: /usr/local/bin/avocado run --vt-type libvirt --vt-config /home/stuff/tests/data/avocado-vt/backends/libvirt/cfg/backuprestore.cfg --force-job-id 091408353f77c85082e9a4bd4043058564e1cacb --job-results-dir /home/stuff/tests/results --vt-only-filter "virtio_scsi virtio_net qcow2 SLES.16.1.ppc64le"
/usr/local/lib/python3.13/site-packages/avocado/core/init.py:18: UserWarning: pkg_resources is deprecated as an API. See https://setuptools.pypa.io/en/latest/pkg_resources.html. The pkg_resources package is slated for removal as early as 2025-11-30. Refrain from using this package or pin to Setuptools<81.
import pkg_resources
No python imaging library installed. Screendump and Windows guest BSOD detection are disabled. In order to enable it, please install python-imaging or the equivalent for your distro.
No python imaging library installed. PPM image conversion to JPEG disabled. In order to enable it, please install python-imaging or the equivalent for your distro.
No python imaging library installed. Screendump and Windows guest BSOD detection are disabled. In order to enable it, please install python-imaging or the equivalent for your distro.
No python imaging library installed. PPM image conversion to JPEG disabled. In order to enable it, please install python-imaging or the equivalent for your distro.
JOB ID : 091408353f77c85082e9a4bd4043058564e1cacb
JOB LOG : /home/stuff/tests/results/job-2026-06-22T09.32-0914083/job.log
(1/1) type_specific.io-github-autotest-libvirt.virsh.reboot.normal_test.id_option.no_mode: STARTED
(1/1) type_specific.io-github-autotest-libvirt.virsh.reboot.normal_test.id_option.no_mode: PASS (57.32 s)
RESULTS : PASS 1 | ERROR 0 | FAIL 0 | SKIP 0 | WARN 0 | INTERRUPT 0 | CANCEL 0
JOB HTML : /home/stuff/tests/results/job-2026-06-22T09.32-0914083/results.html
JOB TIME : 60.47 s

[hholoubk]

The code itself is ok ad make sense. even improving functionality as the returned comparision is beteween timestamp not the datetime string

but when introducing new code it will be better to refactor this 7y old approach.

it would be possible to remove the get_boot_time and reuse vm.uptime() instead.
only please be aware, that the vm.uptime() is returning seconds from boot, so the comparision is vice versa ...
second_boot < first_boot

(and probably would be good to rename in such case variables to [second | first] _uptime