fix update phased restart symlink folder

[nikhilbhatt]

Description

Fixes #3290

During phased restart updated the tag name with folder base name if tag is not set in puma config.

Your checklist for this pull request

• I have reviewed the guidelines for contributing to this repository.
• I have added (or updated) appropriate tests if this PR fixes a bug or adds a feature.
• My pull request is 100 lines added/removed or less so that it can be easily reviewed.
• If this PR doesn't need tests (docs change), I added [ci skip] to the title of the PR.
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• I have updated the documentation accordingly.
• All new and existing tests passed, including Rubocop.

[dentarg]

Any idea how we could test this?

[nikhilbhatt]

Any idea how we could test this?

If you are asking about testing the branch, here how I done it

Temporary changes

1. cd to puma latest version.
2. Create a folder releases/1 and releases/2.
3. Copy file hello.ru to both the releases and update the content if needed.
4. create link ln -s releases/1/ current
5. Update settings.rb file and add following

   workers 2
   directory 'path to current'
   prune_bundler
   

6. run bundle exec bin/puma -C "absolute path to test/config/settings.rb" hello.ru
7. grep for puma
8. unlink current
9. ln -s releases/2/ current
10. kill -SIGUSR1 puma_pid
11. again grep for puma to view updated changes.

for 2nd testing update settings.rb with additional tag testing.
when you repeat above steps there should be no change in tags.

If you are asking about writing test cases for this
I am looking into this.

[nikhilbhatt]

@dentarg

Added testcases in TestWorkerGemIndependence. not sure if it should be in separate or new class.

also used grep here as I did not find any alternative to get the title of Process running. we are using setproctitle to set the title but there is no equivalent to this for get.

[nikhilbhatt]

@dentarg can you check this once?

[dentarg]

I'll check whenever, no stress in open source

[nikhilbhatt]

Is there anything remaining in this from my side?