Fix an issue where Herald may fail to extract content from an empty commit
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Authored by epriestley on Apr 20 2022, 4:53 PM.

Details

Reviewers: None
Maniphest Tasks: T13588: PHP 8 Compatibility
T13667: Landing a mercurial revision which has no changes causes errors on the revision page as well as history viewing
Commits: rPde980cc54e8c: Fix an issue where Herald may fail to extract content from an empty commit

Summary

Ref T13667. The Herald "content added" rule (and other similar rules) do not correctly extract content from empty commits.

When we load an empty raw diff, return an empty changed content map.

Ref T13588. Also fix some PHP8.1 null/string stuff

Test Plan

Ran "bin/repository reparse --publish <commit>", with an empty commit hash and a nonempty commit hash.
Reviewed Herald transcripts for general sanity.

Diff Detail

Repository

rP Phabricator

Branch

sub3

Lint

Lint Passed

Unit

Test Failures

Build Status

Buildable 25646
Build 35474: arc lint + arc unit

Unit TestsFailed
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	Time	Test
	0 ms	DiffusionURITestCase::testBlobDecode EXCEPTION (RuntimeException): explode(): Passing null to parameter #2 ($string) of type string is deprecated #0 [internal function]: PhutilErrorHandler::handleError(8192, 'explode(): Pass...', '/Users/epriestl...', 521) #1 /Users/epriestley/dev/core/lib/phabricator/src/applications/diffusion/request/DiffusionRequest.php(521): explode('/', NULL)
	3 ms	DiffusionURITestCase::testURIGeneration EXCEPTION (RuntimeException): strlen(): Passing null to parameter #1 ($string) of type string is deprecated #0 /Users/epriestley/dev/core/lib/phabricator/src/applications/repository/storage/PhabricatorRepository.php(577): PhutilErrorHandler::handleError(8192, 'strlen(): Passi...', '/Users/epriestl...', 577) #1 /Users/epriestley/dev/core/lib/phabricator/src/applications/repository/storage/PhabricatorRepository.php(591): PhabricatorRepository->getURI()
	0 ms	PhabricatorRepositoryTestCase::testSubversionPathInfo EXCEPTION (RuntimeException): strlen(): Passing null to parameter #1 ($string) of type string is deprecated #0 /Users/epriestley/dev/core/lib/phabricator/src/applications/repository/storage/PhabricatorRepository.php(304): PhutilErrorHandler::handleError(8192, 'strlen(): Passi...', '/Users/epriestl...', 304) #1 /Users/epriestley/dev/core/lib/phabricator/src/applications/repository/storage/__tests__/PhabricatorRepositoryTestCase.php(60): PhabricatorRepository->getSubversionPathURI()
	0 ms	PhabricatorRepositoryURITestCase::testRepositoryURICanonicalization EXCEPTION (RuntimeException): strlen(): Passing null to parameter #1 ($string) of type string is deprecated #0 /Users/epriestley/dev/core/lib/phabricator/src/applications/repository/storage/PhabricatorRepository.php(577): PhutilErrorHandler::handleError(8192, 'strlen(): Passi...', '/Users/epriestl...', 577) #1 /Users/epriestley/dev/core/lib/phabricator/src/applications/repository/storage/PhabricatorRepository.php(591): PhabricatorRepository->getURI()
	36 ms	PhabricatorRepositoryURITestCase::testURIGeneration EXCEPTION (RuntimeException): strlen(): Passing null to parameter #1 ($string) of type string is deprecated #0 /Users/epriestley/dev/core/lib/phabricator/src/applications/repository/storage/PhabricatorRepository.php(284): PhutilErrorHandler::handleError(8192, 'strlen(): Passi...', '/Users/epriestl...', 284) #1 /Users/epriestley/dev/core/lib/phabricator/src/applications/repository/storage/PhabricatorRepository.php(1180): PhabricatorRepository->getSubversionBaseURI()
		View Full Test Results (5 Failed · 27 Passed · 1 Skipped)