@taimoorzaeem great work, thanks!

Could you, please, add manual-QA notes in the PR description? This would be a step-by-step guide showing what it takes to see the effect of your patch locally. This will start with build cabal from your branch (obvious). But then, what do I do to see the warning? Step by step. You could attach any sample files that could help to set up a no-index repository etc. Example of MQA notes is in the description of #9200

You'll also have to make fourmolu and whitespace checkers happy (see the github action failures linked from this page).

Would be great to add a test. See for guidance: https://github.com/haskell/cabal/blob/master/cabal-testsuite/README.md#how-to-write

@ulysses4ever @andreabedini When exactly does cabal create a local .cache file? Are there any example of such test cases that I can follow?

@taimoorzaeem I don't know the answer to your last question from the top of my head, sadly. I could try to dig over the weekend maybe. But in the meantime: can you locally observe the effect of your patch? In other words, the message you added --- can you make cabal built with this patch print this message? If so, please, post the instructions for how to do that.

37 tests affected by the current change (they fail now), but most (all?) of them are seemingly unrelated:

562 tests, 14 skipped, 0 unexpected passes, 37 unexpected fails.
UNEXPECTED FAIL: PackageTests/ShowBuildInfo/Complex/single.test.hs PackageTests/HaddockArgs/quickjump.test.hs PackageTests/HaddockArgs/hoogle.test.hs PackageTests/ConditionalAndImport/cabal.test.hs PackageTests/HaddockProject/haddock-project.test.hs PackageTests/NewFreeze/Flags/new_freeze.test.hs PackageTests/NewFreeze/FreezeFile/new_freeze.test.hs PackageTests/NewFreeze/BuildTools/new_freeze.test.hs PackageTests/BuildTargets/UseLocalPackageForSetup/use-local-package-as-setup-dep.test.hs PackageTests/BuildTargets/UseLocalPackage/use-local-version-of-package.test.hs PackageTests/Backpack/Includes3/cabal-repo.test.hs PackageTests/Backpack/T6385/cabal.test.hs PackageTests/Regression/T9756/cabal.test.hs PackageTests/Regression/T9640/cabal.test.hs PackageTests/NewHaddock/DisableDoc/cabal.test.hs PackageTests/NewHaddock/HaddockOutput/HaddockOutputCmd/cabal.test.hs PackageTests/NewHaddock/HaddockOutput/HaddockOutputConfig/cabal.test.hs PackageTests/NewHaddock/ImplyDependencies/cabal.test.hs PackageTests/OfflineFlag/offlineFlag.test.hs PackageTests/Outdated/outdated.test.hs PackageTests/Outdated/outdated-project-file.test.hs PackageTests/Outdated/outdated_freeze.test.hs PackageTests/VersionPriority/3-web.test.hs PackageTests/VersionPriority/2-local.test.hs PackageTests/VersionPriority/1-web.test.hs PackageTests/VersionPriority/1-local.test.hs PackageTests/VersionPriority/0-local.test.hs PackageTests/VersionPriority/2-web.test.hs PackageTests/Get/OnlyDescription/cabal.test.hs PackageTests/ExtraPackages/cabal.test.hs PackageTests/CopyHie/cabal.test.hs PackageTests/HaddockBuildDepends/cabal.test.hs PackageTests/Freeze/enable-benchmarks.test.hs PackageTests/Freeze/disable-tests.test.hs PackageTests/Freeze/disable-benchmarks.test.hs PackageTests/Freeze/freeze.test.hs PackageTests/Freeze/enable-tests.test.hs

can you locally observe the effect of your patch? In other words, the message you added --- can you make cabal built with this patch print this message? If so, please, post the instructions for how to do that.

No, I am not able to observe the effect locally. That's because I am not sure when exactly cabal create a local no index cache. The warning message is only supposed to be printed when this cache file is created by cabal. Since I am not a much advanced user of cabal, I would like some you folks' help. @andreabedini Could you help out on how I should go about testing/qa it locally?