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[Armbian build PR] - Fix for journald filling /var/log using flush from volatile instead of copy, and removing cache files when nearly full


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Description

After some experimenting I found a way to flush the journal and maintain logs in tmpfs using /run/log/journal, and only have a softlink from /var/log/journal to /var/log.hdd/journal. Additionally the cached journals are to be cleaned up when /var/log becomes too full.

Some logic was needed in cases where the user decides to do Storage=volatile journal logging in /etc/systemd/journald.conf, or when the user or journald with Storage=persistent creates a /var/log/journal folder which will be moved to /var/log.hdd/journal and replaced by the softlink.

I didn't find any documentation, so wasn't able to update it.

Jira reference number [AR-9999]

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Please also note any relevant details for your test configuration.

  • [x] Test A: tested stop, start, write for armbian-ramlog with rsync
  • [x] Test B: tested truncate-logs
  • [x] Test C: tested stop, start, write for armbian-ramlog without rsync

Checklist:

  • [x] My code follows the style guidelines of this project
  • [x] I have performed a self-review of my own code
  • [x] I have commented my code, particularly in hard-to-understand areas
  • [ ] I have made corresponding changes to the documentation
  • [x] My changes generate no new warnings
  • [x] Any dependent changes have been merged and published in downstream modules

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