[Elastic Agent] Fix sysv init files for deb/rpm installation

[blakerouse]

What does this PR do?

Fixes the sysv init files so it works on deb/rpm systems that use sysv and not systemd.

Why is it important?

So deb/rpm work on sysv init systems.

Checklist

• My code follows the style guidelines of this project
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [ ] I have made corresponding change to the default configuration files
• [ ] I have added tests that prove my fix is effective or that my feature works
• I have added an entry in CHANGELOG.next.asciidoc or CHANGELOG-developer.next.asciidoc.

Related issues

• Closes Elastic Agent fails to start using instructions for sysvinit systems #22360
• Closes Agent goes to Offline status on reboot of Linux deb stand-alone agent enroll to Fleet #22485

[elasticmachine]

Pinging @elastic/ingest-management (Team:Ingest Management)

[elasticmachine]

💚 Build Succeeded

the below badges are clickable and redirect to their specific view in the CI or DOCS

Expand to view the summary

Build stats

• Build Cause: [Pull request #22543 event]

• Start Time: 2020-11-11T14:51:35.040+0000

• Duration: 72 min 27 sec

Test stats 🧪

Test	Results
Failed	0
Passed	16593
Skipped	1349
Total	17942

[ph]

Can we target 7.x and 7.10 so it goes in 7.10.1?

[ph]

@rahulgupta-qasource and @EricDavisX this solve the recent issues we found in debian9 or other based sysv system.

[elasticmachine]

💚 Flaky test report

Tests succeeded.

Expand to view the summary

Test stats 🧪

Test	Results
Failed	0
Passed	16593
Skipped	1349
Total	17942

[blakerouse]

/packaging

[blakerouse]

@ph will backport to 7.10

[EricDavisX]

it would be great to do the possibly minimal work to get the .rpm/.deb tests back running in the e2e-testing repo here elastic/e2e-testing#379
and we could use this chance to add in Debian9 (if the current Debian system under test doesn't have SysV)

[michalpristas]

LGTM

[ghost]

Hi @EricDavisX /@ph

We are blocked to validate this ticket for 7.10.1 BC1 .rpm(on CentOS7 machine) and .deb(on Debian9 machine) packages on 7.10.1 BC1 Kibana cloud environment(deployed from staging platform) due to bug #22744

Build details:
Kibana Commit: 1d4cfde288ede0c4bc6277b4d589ca0cb96b231f
Build : 36050
7.10.1 BC1 Linux .rpm agent package link: https://staging.elastic.co/7.10.1-ce3b40e6/downloads/beats/elastic-agent/elastic-agent-7.10.1-x86_64.rpm
7.10.1 BC1 Linux .deb agent package link: https://staging.elastic.co/7.10.1-ce3b40e6/downloads/beats/elastic-agent/elastic-agent-7.10.1-amd64.deb

Once the above bug #22744 is fixed, we will validate this ticket.

[EricDavisX]

discussed with team we will target additional fixes in 7.11.0 and 7.10.2 - we are past the date for 7.10.1 fixes to routinely be discussed and since it is not functioning in 7.10 we aren't any worse than we were. we can do a thorough testing run in 22744 in later cycle.

[ghost]

Hi @EricDavisX

We have performed regression testing for Linux deb/rpm on 7.10.2 BC1 Kibana cloud build. Build details is as follows:

Platform: Staging
Version: 7.10.2
Commit: a0b7936
Build number: 36136
Artifact: https://staging.elastic.co/7.10.2-e6b2b8c2/summary-7.10.2.html

We have execute test cases under test plan execution :

• Test Run for Linux .deb deploy of BC Agent/Endpoint with minimal sanity test
• Test Run for Linux .rpm deploy of BC Agent/Endpoint with minimal sanity test

Please let us know if anything else is required to be covered.

Thanks