br: fix unstable s3 test (#33610)

[ti-srebot]

cherry-pick #33610 to release-5.4
You can switch your code base to this Pull Request by using git-extras:

# In tidb repo:
git pr https://github.com/pingcap/tidb/pull/33647

After apply modifications, you can push your change to this PR via:

git push [email protected]:ti-srebot/tidb.git pr/33647:release-5.4-d3245357d08d

---

Signed-off-by: Yu Juncen [email protected]

What problem does this PR solve?

Issue Number: close #33644

Problem Summary:

The test case br_s3 is unstable. The reason would probably be that curl exit with 0 even it met a 503 HTTP CODE. At this condition, mc would fail soon and so did the test.

What is changed and how it works?

Test the status code instead of the exit code of curl.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Release note

None

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has not been approved.

To complete the pull request process, please ask the reviewers in the list to review by filling /cc @reviewer in the comment.
After your PR has acquired the required number of LGTMs, you can assign this pull request to the committer in the list by filling /assign @committer in the comment to help you merge this pull request.

The full list of commands accepted by this bot can be found here.

Reviewer can indicate their review by submitting an approval review.
Reviewer can cancel approval by submitting a request changes review.

[ti-srebot]

/run-all-tests

[ti-srebot]

@YuJuncen you're already a collaborator in bot's repo.

[sre-bot]

Code Coverage Details: https://codecov.io/github/pingcap/tidb/commit/f855974fde96b8fbdda367da47fd99be63125511

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Please upload report for BASE (release-5.4@b1c5a67). Learn more about missing BASE report.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-5.4     #33647   +/-   ##
================================================
  Coverage               ?   63.8116%           
================================================
  Files                  ?        775           
  Lines                  ?     255574           
  Branches               ?          0           
================================================
  Hits                   ?     163086           
  Misses                 ?      79560           
  Partials               ?      12928