CI: set /etc/hostid in zloop runner

[behlendorf]

Motivation and Context

 libzpool: WARNING: pool 'ztest' system hostid not set, aborted import during open
ASSERT at cmd/ztest.c:8412:ztest_run()
VERIFY3S(error, ==, ENOENT) failed (121 == 0x2)
  PID: 114541    COMM: ztest
  TID: 114541    NAME: ztest

https://github.com/openzfs/zfs/actions/runs/24097857703/job/70330214420?pr=18148

Description

ztest can enable and disable the multihost property on when testing. This can result in a failure when attempting to import and existing pool when multihost=on but no /etc/hostid file exists. Update the workflow to use zgenhostid to create /etc/hostid when not present.

How Has This Been Tested?

Will be tested by the CI.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Performance enhancement (non-breaking change which improves efficiency)
• Code cleanup (non-breaking change which makes code smaller or more readable)
• Quality assurance (non-breaking change which makes the code more robust against bugs)
• Breaking change (fix or feature that would cause existing functionality to change)
• Library ABI change (libzfs, libzfs_core, libnvpair, libuutil and libzfsbootenv)
• Documentation (a change to man pages or other documentation)

Checklist:

• My code follows the OpenZFS code style requirements.
• I have updated the documentation accordingly.
• I have read the contributing document.
• I have added tests to cover my changes.
• I have run the ZFS Test Suite with this change applied.
• All commit messages are properly formatted and contain Signed-off-by.

[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Updates the zloop GitHub Actions workflow to ensure /etc/hostid is present on the CI runner, preventing ztest failures when multihost=on and the system hostid is unset.

Changes:

• Generate /etc/hostid via zgenhostid when missing before creating/importing pools in zloop.

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[Copilot]

Pull request overview

Copilot reviewed 1 out of 1 changed files in this pull request and generated no new comments.

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