Cherry-pick #21772 to 7.x: [Elastic Agent] Don't perform install until after enroll #21816
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* Flip install and enroll. * Update order. * Always perform uninstall of service. * Fix issue with no enrolling. * Fix enrollment no. * Add changelog. (cherry picked from commit 34da9c9)
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Cherry-pick of PR #21772 to 7.x branch. Original message:
What does this PR do?
This switches the installation to be based on successful enrollment. First agent is installed in the correct location (but is not started), then enrollment is performed. In the case that enrollment fails the installation directory is removed, if enrollment is successful then it starts the persistent service.
This also adds a check to ensure that an Elastic Agent is not already running from the extracted Elastic Agent directory. This is because an already running Elastic Agent in that directory will cause installation to fail because on Windows some of the files will not be able to be opened to be copied to there new location.
Why is it important?
It removes the need to restart an already running Elastic Agent that was just started. It removes the requirement to start Elastic Agent in standalone mode first then switching it to Fleet mode. It helps ensure that installation is only successful when enrollment is successful.
Checklist
[ ] 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 worksCHANGELOG.next.asciidocorCHANGELOG-developer.next.asciidoc.Related issues