Shallow and concurrent git clones #10254
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Cloning the entire repository for the purpose of compiling packages specified in source-repository-packages is wasted effort. To read and compile the package, we need only the HEAD of the repository, thus a shallow clone is sufficient. Note that this doesn't change the behaviour of `cabal get -s` which still does a full clone (--depth=1 is only used in vcsSyncRepo, not in vcsCloneRepo) Fixes haskell#7264
Cloning/synchronising VCS repos can be unnecessarily slow if done serially. By synchronizing the repos concurrently we make much better use of time. Introduces rerunConcurrentlyIfChanged, a Rebuild monad function that runs, from multiple actions, the actions that need rebuilding concurrently.
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Include the following checklist in your PR:
Manual QA: Create or use a package with multiple source-repository-package dependencies,
cabal clean, thencabal build. You should see two repositories start being cloned at the same time, and then see other repositories being cloned concurrently as jobs are finished. The reason why only two repositories get cloned in parallel is that the limit of asynchronous downloads is == 2, to mimicasyncFetchPackages.Questions: The maximum two-job cap on cloning concurrency seems too low, I think it would be best if it could be configured (as a follow up MR?)